Reserved Words and KeywordsMonitoring Tables

`RDB$BACKUP_HISTORY`

RDB$BACKUP_HISTORY stores the history of backups performed using the nBackup utility.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$BACKUP_ID`	`INTEGER`	The identifier assigned by the engine
`RDB$TIMESTAMP`	`TIMESTAMP WITH TIME ZONE`	Backup date and time
`RDB$BACKUP_LEVEL`	`INTEGER`	Backup level
`RDB$GUID`	`CHAR(38)`	Unique identifier
`RDB$SCN`	`INTEGER`	System (scan) number
`RDB$FILE_NAME`	`VARCHAR(255)`	Full path and file name of backup file

RDB$BACKUP_ID

INTEGER

The identifier assigned by the engine

RDB$TIMESTAMP

TIMESTAMP WITH TIME ZONE

Backup date and time

RDB$BACKUP_LEVEL

INTEGER

Backup level

RDB$GUID

CHAR(38)

Unique identifier

RDB$SCN

INTEGER

System (scan) number

RDB$FILE_NAME

VARCHAR(255)

Full path and file name of backup file

`RDB$INDICES`

RDB$INDICES stores definitions of both system- and user-defined indexes.The attributes of each column belonging to an index are stored in one row of the table RDB$INDEX_SEGMENTS.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$INDEX_NAME`	`CHAR(63)`	The unique name of the index specified by the user or automatically generated by the system
`RDB$RELATION_NAME`	`CHAR(63)`	The name of the table to which the index belongs.It corresponds to an identifier in `RDB$RELATION_NAME.RDB$RELATIONS`
`RDB$INDEX_ID`	`SMALLINT`	The internal (system) identifier of the index
`RDB$UNIQUE_FLAG`	`SMALLINT`	Specifies whether the index is unique: `0` - not unique `1` - unique
`RDB$DESCRIPTION`	`BLOB TEXT`	Could store comments concerning the index
`RDB$SEGMENT_COUNT`	`SMALLINT`	The number of segments (columns) in the index
`RDB$INDEX_INACTIVE`	`SMALLINT`	Indicates whether the index is currently active: `0` - active `1` - inactive
`RDB$INDEX_TYPE`	`SMALLINT`	Distinguishes between an ascending (`0` or `NULL`) and descending index (`1`).Not used in databases created before Firebird 2.0;hence, indexes in upgraded databases are more likely to store `NULL` in this column
`RDB$FOREIGN_KEY`	`CHAR(63)`	The name of the primary or unique key index referenced by the foreign key backed by this index;`NULL` if this index is not used by a foreign key.
`RDB$SYSTEM_FLAG`	`SMALLINT`	Indicates whether the index is system-defined or user-defined: `0` - user-defined `1` or greater - system-defined
`RDB$EXPRESSION_BLR`	`BLOB BLR`	The binary language representation (BLR) of the expression of an expression index, used for calculating the values for the index at runtime.
`RDB$EXPRESSION_SOURCE`	`BLOB TEXT`	The source code of the expression of an expression index
`RDB$STATISTICS`	`DOUBLE PRECISION`	Stores the last known selectivity of the entire index, calculated by execution of a `SET STATISTICS` statement over the index.It is also recalculated whenever the database is first opened by the server.The selectivity of each separate segment of the index is stored in `RDB$INDEX_SEGMENTS`.
`RDB$CONDITION_BLR`	`BLOB BLR`	The binary language representation (BLR) of the `WHERE` condition of a partial index, used for filtering the values for the index at runtime, and optimizer decisions to use the index.
`RDB$CONDITION_SOURCE`	`BLOB TEXT`	The source code of the `WHERE` condition of a partial index

RDB$INDEX_NAME

CHAR(63)

The unique name of the index specified by the user or automatically generated by the system

RDB$RELATION_NAME

CHAR(63)

The name of the table to which the index belongs.It corresponds to an identifier in RDB$RELATION_NAME.RDB$RELATIONS

RDB$INDEX_ID

SMALLINT

The internal (system) identifier of the index

RDB$UNIQUE_FLAG

SMALLINT

Specifies whether the index is unique:

0 - not unique
1 - unique

RDB$DESCRIPTION

BLOB TEXT

Could store comments concerning the index

RDB$SEGMENT_COUNT

SMALLINT

The number of segments (columns) in the index

RDB$INDEX_INACTIVE

SMALLINT

Indicates whether the index is currently active:

0 - active
1 - inactive

RDB$INDEX_TYPE

SMALLINT

Distinguishes between an ascending (0 or NULL) and descending index (1).Not used in databases created before Firebird 2.0;hence, indexes in upgraded databases are more likely to store NULL in this column

RDB$FOREIGN_KEY

CHAR(63)

The name of the primary or unique key index referenced by the foreign key backed by this index;NULL if this index is not used by a foreign key.

RDB$SYSTEM_FLAG

SMALLINT

Indicates whether the index is system-defined or user-defined:

0 - user-defined
1 or greater - system-defined

RDB$EXPRESSION_BLR

BLOB BLR

The binary language representation (BLR) of the expression of an expression index, used for calculating the values for the index at runtime.

RDB$EXPRESSION_SOURCE

BLOB TEXT

The source code of the expression of an expression index

RDB$STATISTICS

DOUBLE PRECISION

Stores the last known selectivity of the entire index, calculated by execution of a SET STATISTICS statement over the index.It is also recalculated whenever the database is first opened by the server.The selectivity of each separate segment of the index is stored in RDB$INDEX_SEGMENTS.

RDB$CONDITION_BLR

BLOB BLR

The binary language representation (BLR) of the WHERE condition of a partial index, used for filtering the values for the index at runtime, and optimizer decisions to use the index.

RDB$CONDITION_SOURCE

BLOB TEXT

The source code of the WHERE condition of a partial index

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`RDB$KEYWORDS`

RDB$KEYWORDS is a virtual table listing the keywords used by the Firebird SQL parser.If a keyword is reserved, it cannot be used as a regular identifier, but only as a delimited (quoted) identifier.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$KEYWORD_NAME`	`VARCHAR(63)`	Keyword
`RDB$KEYWORD_RESERVED`	`BOOLEAN`	`true` if this a reserved word, `false` otherwise

RDB$KEYWORD_NAME

VARCHAR(63)

Keyword

RDB$KEYWORD_RESERVED

BOOLEAN

true if this a reserved word, false otherwise

`RDB$LOG_FILES`

RDB$LOG_FILES is not currently used.

`RDB$PACKAGES`

RDB$PACKAGES stores the definition (header and body) of SQL packages.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$PACKAGE_NAME`	`CHAR(63)`	Name of the package
`RDB$PACKAGE_HEADER_SOURCE`	`BLOB TEXT`	The PSQL sourcecode of the package header
`RDB$PACKAGE_BODY_SOURCE`	`BLOB TEXT`	The PSQL sourcecode of the package body
`RDB$VALID_BODY_FLAG`	`SMALLINT`	Indicates whether the body of the package is still valid.`NULL` or `0` indicates the body is not valid.
`RDB$SECURITY_CLASS`	`CHAR(63)`	May reference a security class defined in the table `RDB$SECURITY_CLASSES`, to apply access control limits to all users of this package
`RDB$OWNER_NAME`	`CHAR(63)`	The username of the user who created the package originally
`RDB$SYSTEM_FLAG`	`SMALLINT`	Flag: `0` - user-defined `1` or higher - system-defined
`RDB$DESCRIPTION`	`BLOB TEXT`	Optional description of the package (comment)
`RDB$SQL_SECURITY`	`BOOLEAN`	The `SQL SECURITY` mode (`DEFINER` or `INVOKER`): `NULL` - initial default (`INVOKER`) `FALSE` - `INVOKER` `TRUE` - `DEFINER`

RDB$PACKAGE_NAME

CHAR(63)

Name of the package

RDB$PACKAGE_HEADER_SOURCE

BLOB TEXT

The PSQL sourcecode of the package header

RDB$PACKAGE_BODY_SOURCE

BLOB TEXT

The PSQL sourcecode of the package body

RDB$VALID_BODY_FLAG

SMALLINT

Indicates whether the body of the package is still valid.NULL or 0 indicates the body is not valid.

RDB$SECURITY_CLASS

CHAR(63)

May reference a security class defined in the table RDB$SECURITY_CLASSES, to apply access control limits to all users of this package

RDB$OWNER_NAME

CHAR(63)

The username of the user who created the package originally

RDB$SYSTEM_FLAG

SMALLINT

Flag:

0 - user-defined
1 or higher - system-defined

RDB$DESCRIPTION

BLOB TEXT

Optional description of the package (comment)

RDB$SQL_SECURITY

BOOLEAN

The SQL SECURITY mode (DEFINER or INVOKER):

NULL - initial default (INVOKER)
FALSE - INVOKER
TRUE - DEFINER

`RDB$PAGES`

RDB$PAGES stores and maintains information about database pages and their usage.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$PAGE_NUMBER`	`INTEGER`	The unique number of a physically created database page
`RDB$RELATION_ID`	`SMALLINT`	The identifier of the table to which the page is allocated
`RDB$PAGE_SEQUENCE`	`INTEGER`	The number of the page in the sequence of all pages allocated to this table
`RDB$PAGE_TYPE`	`SMALLINT`	Indicates the page type (data, index, `BLOB`, etc.).For system use

RDB$PAGE_NUMBER

INTEGER

The unique number of a physically created database page

RDB$RELATION_ID

SMALLINT

The identifier of the table to which the page is allocated

RDB$PAGE_SEQUENCE

INTEGER

The number of the page in the sequence of all pages allocated to this table

RDB$PAGE_TYPE

SMALLINT

Indicates the page type (data, index, BLOB, etc.).For system use

`RDB$PROCEDURES`

RDB$PROCEDURES stores the definitions of stored procedures, including their PSQL source code and its binary language representation (BLR).The next table, RDB$PROCEDURE_PARAMETERS, stores the definitions of input and output parameters.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$PROCEDURE_NAME`	`CHAR(63)`	Stored procedure name (identifier)
`RDB$PROCEDURE_ID`	`SMALLINT`	The procedure’s unique, system-generated identifier
`RDB$PROCEDURE_INPUTS`	`SMALLINT`	Indicates the number of input parameters.`NULL` if there are none
`RDB$PROCEDURE_OUTPUTS`	`SMALLINT`	Indicates the number of output parameters.`NULL` if there are none
`RDB$DESCRIPTION`	`BLOB TEXT`	Any text comments related to the procedure
`RDB$PROCEDURE_SOURCE`	`BLOB TEXT`	The PSQL source code of the procedure
`RDB$PROCEDURE_BLR`	`BLOB BLR`	The binary language representation (BLR) of the procedure code (PSQL procedures only)
`RDB$SECURITY_CLASS`	`CHAR(63)`	May point to the security class defined in the system table `RDB$SECURITY_CLASSES` to apply access control limits
`RDB$OWNER_NAME`	`CHAR(63)`	The username of the procedure’s Owner — the user who was `CURRENT_USER` when the procedure was first created.It may or may not be the username of the author.
`RDB$RUNTIME`	`BLOB`	A metadata description of the procedure, used internally for optimization
`RDB$SYSTEM_FLAG`	`SMALLINT`	Indicates whether the procedure is defined by a user (value 0) or by the system (a value of 1 or greater)
`RDB$PROCEDURE_TYPE`	`SMALLINT`	Procedure type: `1` - selectable stored procedure (contains a SUSPEND statement) `2` - executable stored procedure `NULL` - not known * * for procedures created before Firebird 1.5
`RDB$VALID_BLR`	`SMALLINT`	Indicates whether the source PSQL of the stored procedure remains valid after the latest `ALTER PROCEDURE` modification
`RDB$DEBUG_INFO`	`BLOB DEBUG_INFORMATION`	Contains debugging information about variables used in the stored procedure
`RDB$ENGINE_NAME`	`CHAR(63)`	Engine for external functions.`'UDR'` for UDR procedures.`NULL` for PSQL stored procedures
`RDB$ENTRYPOINT`	`CHAR(255)`	The exported name of the external function in the procedure library.Note, this is often not the same as `RDB$PROCEDURE_NAME`, which is the identifier with which the external stored procedure is declared to the database
`RDB$PACKAGE_NAME`	`CHAR(63)`	Package name of the procedure (or `NULL` for a top-level stored procedure)
`RDB$PRIVATE_FLAG`	`SMALLINT`	`NULL` for normal (top-level) stored procedures, `0` for package procedures defined in the header, `1` for package procedures only defined in the package body.
`RDB$SQL_SECURITY`	`BOOLEAN`	The `SQL SECURITY` mode (`DEFINER` or `INVOKER`): `NULL` - initial default (`INVOKER`) `FALSE` - `INVOKER` `TRUE` - `DEFINER`

RDB$PROCEDURE_NAME

CHAR(63)

Stored procedure name (identifier)

RDB$PROCEDURE_ID

SMALLINT

The procedure’s unique, system-generated identifier

RDB$PROCEDURE_INPUTS

SMALLINT

Indicates the number of input parameters.NULL if there are none

RDB$PROCEDURE_OUTPUTS

SMALLINT

Indicates the number of output parameters.NULL if there are none

RDB$DESCRIPTION

BLOB TEXT

Any text comments related to the procedure

RDB$PROCEDURE_SOURCE

BLOB TEXT

The PSQL source code of the procedure

RDB$PROCEDURE_BLR

BLOB BLR

The binary language representation (BLR) of the procedure code (PSQL procedures only)

RDB$SECURITY_CLASS

CHAR(63)

May point to the security class defined in the system table RDB$SECURITY_CLASSES to apply access control limits

RDB$OWNER_NAME

CHAR(63)

The username of the procedure’s Owner — the user who was CURRENT_USER when the procedure was first created.It may or may not be the username of the author.

RDB$RUNTIME

BLOB

A metadata description of the procedure, used internally for optimization

RDB$SYSTEM_FLAG

SMALLINT

Indicates whether the procedure is defined by a user (value 0) or by the system (a value of 1 or greater)

RDB$PROCEDURE_TYPE

SMALLINT

Procedure type:

1 - selectable stored procedure (contains a SUSPEND statement)
2 - executable stored procedure
NULL - not known *

* for procedures created before Firebird 1.5

RDB$VALID_BLR

SMALLINT

Indicates whether the source PSQL of the stored procedure remains valid after the latest ALTER PROCEDURE modification

RDB$DEBUG_INFO

BLOB DEBUG_INFORMATION

Contains debugging information about variables used in the stored procedure

RDB$ENGINE_NAME

CHAR(63)

Engine for external functions.'UDR' for UDR procedures.NULL for PSQL stored procedures

RDB$ENTRYPOINT

CHAR(255)

The exported name of the external function in the procedure library.Note, this is often not the same as RDB$PROCEDURE_NAME, which is the identifier with which the external stored procedure is declared to the database

RDB$PACKAGE_NAME

CHAR(63)

Package name of the procedure (or NULL for a top-level stored procedure)

RDB$PRIVATE_FLAG

SMALLINT

NULL for normal (top-level) stored procedures, 0 for package procedures defined in the header, 1 for package procedures only defined in the package body.

RDB$SQL_SECURITY

BOOLEAN

The SQL SECURITY mode (DEFINER or INVOKER):

NULL - initial default (INVOKER)
FALSE - INVOKER
TRUE - DEFINER

`RDB$PROCEDURE_PARAMETERS`

RDB$PROCEDURE_PARAMETERS stores the parameters of stored procedures and their attributes.It holds one row for each parameter.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$PARAMETER_NAME`	`CHAR(63)`	Parameter name
`RDB$PROCEDURE_NAME`	`CHAR(63)`	The name of the procedure where the parameter is defined
`RDB$PARAMETER_NUMBER`	`SMALLINT`	The sequential number of the parameter
`RDB$PARAMETER_TYPE`	`SMALLINT`	Indicates whether the parameter is for input (value 0) or output (value 1)
`RDB$FIELD_SOURCE`	`CHAR(63)`	The name of the user-created domain, when a domain is referenced instead of a data type.If the name starts with the prefix “RDB$”, it is the name of the domain automatically generated by the system for the parameter.
`RDB$DESCRIPTION`	`BLOB TEXT`	Could store comments related to the parameter
`RDB$SYSTEM_FLAG`	`SMALLINT`	Indicates whether the parameter was defined by the system (value or greater) or by a user (value 0)
`RDB$DEFAULT_VALUE`	`BLOB BLR`	The binary language representation (BLR) of the default value of the parameter
`RDB$DEFAULT_SOURCE`	`BLOB TEXT`	The default value for the parameter, in PSQL code
`RDB$COLLATION_ID`	`SMALLINT`	The identifier of the collation used for a character parameter
`RDB$NULL_FLAG`	`SMALLINT`	The flag indicating whether `NULL` is allowable
`RDB$PARAMETER_MECHANISM`	`SMALLINT`	Flag: indicates how this parameter is passed: `0` - by value `1` - by reference `2` - by descriptor `3` - by BLOB descriptor
`RDB$FIELD_NAME`	`CHAR(63)`	The name of the column the parameter references, if it was declared using `TYPE OF COLUMN` instead of a regular data type.Used in conjunction with `RDB$RELATION_NAME` (see next).
`RDB$RELATION_NAME`	`CHAR(63)`	The name of the table the parameter references, if it was declared using `TYPE OF COLUMN` instead of a regular data type
`RDB$PACKAGE_NAME`	`CHAR(63)`	Package name of the procedure (or `NULL` for a top-level stored procedure)

RDB$PARAMETER_NAME

CHAR(63)

Parameter name

RDB$PROCEDURE_NAME

CHAR(63)

The name of the procedure where the parameter is defined

RDB$PARAMETER_NUMBER

SMALLINT

The sequential number of the parameter

RDB$PARAMETER_TYPE

SMALLINT

Indicates whether the parameter is for input (value 0) or output (value 1)

RDB$FIELD_SOURCE

CHAR(63)

The name of the user-created domain, when a domain is referenced instead of a data type.If the name starts with the prefix “RDB$”, it is the name of the domain automatically generated by the system for the parameter.

RDB$DESCRIPTION

BLOB TEXT

Could store comments related to the parameter

RDB$SYSTEM_FLAG

SMALLINT

Indicates whether the parameter was defined by the system (value or greater) or by a user (value 0)

RDB$DEFAULT_VALUE

BLOB BLR

The binary language representation (BLR) of the default value of the parameter

RDB$DEFAULT_SOURCE

BLOB TEXT

The default value for the parameter, in PSQL code

RDB$COLLATION_ID

SMALLINT

The identifier of the collation used for a character parameter

RDB$NULL_FLAG

SMALLINT

The flag indicating whether NULL is allowable

RDB$PARAMETER_MECHANISM

SMALLINT

Flag: indicates how this parameter is passed:

0 - by value
1 - by reference
2 - by descriptor
3 - by BLOB descriptor

RDB$FIELD_NAME

CHAR(63)

The name of the column the parameter references, if it was declared using TYPE OF COLUMN instead of a regular data type.Used in conjunction with RDB$RELATION_NAME (see next).

RDB$RELATION_NAME

CHAR(63)

The name of the table the parameter references, if it was declared using TYPE OF COLUMN instead of a regular data type

RDB$PACKAGE_NAME

CHAR(63)

Package name of the procedure (or NULL for a top-level stored procedure)

`RDB$PUBLICATIONS`

RDB$PUBLICATIONS stores the replication publications defined in the database.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$PUBLICATION_NAME`	`CHAR(63)`	Publication name
`RDB$OWNER_NAME`	`CHAR(63)`	The username of the user who created the publication
`RDB$SYSTEM_FLAG`	`SMALLINT`	Flag: `0` - user-defined `1` or higher - system-defined
`RDB$ACTIVE_FLAG`	`SMALLINT`	Inactive (`0`) or active (`1`)
`RDB$AUTO_ENABLE`	`SMALLINT`	Automatically add new tables to publication: `0` - disabled `1` - enabled (tables are automatically added to this publication)

RDB$PUBLICATION_NAME

CHAR(63)

Publication name

RDB$OWNER_NAME

CHAR(63)

The username of the user who created the publication

RDB$SYSTEM_FLAG

SMALLINT

Flag:

0 - user-defined
1 or higher - system-defined

RDB$ACTIVE_FLAG

SMALLINT

Inactive (0) or active (1)

RDB$AUTO_ENABLE

SMALLINT

Automatically add new tables to publication:

0 - disabled
1 - enabled (tables are automatically added to this publication)

Note	In Firebird 5.0 there is a single (pre-defined) publication named `RDB$DEFAULT`.User-defined publications will be available in future Firebird releases.

`RDB$PUBLICATION_TABLES`

RDB$PUBLICATION_TABLES stores the names of tables that are replicated as part of a publication.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$PUBLICATION_NAME`	`CHAR(63)`	Publication name
`RDB$TABLE_NAME`	`CHAR(63)`	Table name

RDB$PUBLICATION_NAME

CHAR(63)

Publication name

RDB$TABLE_NAME

CHAR(63)

Table name

`RDB$REF_CONSTRAINTS`

RDB$REF_CONSTRAINTS stores the attributes of the referential constraints — Foreign Key relationships and referential actions.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$CONSTRAINT_NAME`	`CHAR(63)`	Foreign key constraint name, defined by the user or automatically generated by the system
`RDB$CONST_NAME_UQ`	`CHAR(63)`	The name of the primary or unique key constraint linked by the `REFERENCES` clause in the constraint definition
`RDB$MATCH_OPTION`	`CHAR(7)`	Not used.The current value is `FULL` in all cases
`RDB$UPDATE_RULE`	`CHAR(11)`	Referential integrity actions applied to the foreign key record(s) when the primary (unique) key of the parent table is updated: `RESTRICT`, `NO ACTION`, `CASCADE`, `SET NULL`, `SET DEFAULT`
`RDB$DELETE_RULE`	`CHAR(11)`	Referential integrity actions applied to the foreign key record(s) when the primary (unique) key of the parent table is deleted: `RESTRICT`, `NO ACTION`, `CASCADE`, `SET NULL`, `SET DEFAULT`

RDB$CONSTRAINT_NAME

CHAR(63)

Foreign key constraint name, defined by the user or automatically generated by the system

RDB$CONST_NAME_UQ

CHAR(63)

The name of the primary or unique key constraint linked by the REFERENCES clause in the constraint definition

RDB$MATCH_OPTION

CHAR(7)

Not used.The current value is FULL in all cases

RDB$UPDATE_RULE

CHAR(11)

Referential integrity actions applied to the foreign key record(s) when the primary (unique) key of the parent table is updated: RESTRICT, NO ACTION, CASCADE, SET NULL, SET DEFAULT

RDB$DELETE_RULE

CHAR(11)

Referential integrity actions applied to the foreign key record(s) when the primary (unique) key of the parent table is deleted: RESTRICT, NO ACTION, CASCADE, SET NULL, SET DEFAULT

`RDB$CHARACTER_SETS`

RDB$CHARACTER_SETS names and describes the character sets available in the database.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$CHARACTER_SET_NAME`	`CHAR(63)`	Character set name
`RDB$FORM_OF_USE`	`CHAR(63)`	Not used
`RDB$NUMBER_OF_CHARACTERS`	`INTEGER`	The number of characters in the set.Not used for existing character sets
`RDB$DEFAULT_COLLATE_NAME`	`CHAR(63)`	The name of the default collation for the character set
`RDB$CHARACTER_SET_ID`	`SMALLINT`	Unique character set identifier
`RDB$SYSTEM_FLAG`	`SMALLINT`	System flag: value is 1 if the character set is defined in the system when the database is created;value is 0 for a user-defined character set
`RDB$DESCRIPTION`	`BLOB TEXT`	Could store text description of the character set
`RDB$FUNCTION_NAME`	`CHAR(63)`	For a user-defined character set that is accessed via an external function, the name of the external function
`RDB$BYTES_PER_CHARACTER`	`SMALLINT`	The maximum number of bytes representing one character
`RDB$SECURITY_CLASS`	`CHAR(63)`	May reference a security class defined in the table `RDB$SECURITY_CLASSES`, to apply access control limits to all users of this character set
`RDB$OWNER_NAME`	`CHAR(63)`	The username of the user who created the character set originally

RDB$CHARACTER_SET_NAME

CHAR(63)

Character set name

RDB$FORM_OF_USE

CHAR(63)

Not used

RDB$NUMBER_OF_CHARACTERS

INTEGER

The number of characters in the set.Not used for existing character sets

RDB$DEFAULT_COLLATE_NAME

CHAR(63)

The name of the default collation for the character set

RDB$CHARACTER_SET_ID

SMALLINT

Unique character set identifier

RDB$SYSTEM_FLAG

SMALLINT

System flag: value is 1 if the character set is defined in the system when the database is created;value is 0 for a user-defined character set

RDB$DESCRIPTION

BLOB TEXT

Could store text description of the character set

RDB$FUNCTION_NAME

CHAR(63)

For a user-defined character set that is accessed via an external function, the name of the external function

RDB$BYTES_PER_CHARACTER

SMALLINT

The maximum number of bytes representing one character

RDB$SECURITY_CLASS

CHAR(63)

May reference a security class defined in the table RDB$SECURITY_CLASSES, to apply access control limits to all users of this character set

RDB$OWNER_NAME

CHAR(63)

The username of the user who created the character set originally

`RDB$RELATIONS`

RDB$RELATIONS stores the top-level definitions and attributes of all tables and views in the system.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$VIEW_BLR`	`BLOB BLR`	The binary language representation (BLR) of the query specification of a view.The field stores `NULL` for a table
`RDB$VIEW_SOURCE`	`BLOB TEXT`	Contains the original source text of the query for a view, in SQL language.User comments are included.The field stores `NULL` for a table
`RDB$DESCRIPTION`	`BLOB TEXT`	Could store comments related to the table or view
`RDB$RELATION_ID`	`SMALLINT`	Internal identifier of the table or view
`RDB$SYSTEM_FLAG`	`SMALLINT`	indicates whether the table or view is user-defined (value 0) or system-defined (value 1 or greater)
`RDB$DBKEY_LENGTH`	`SMALLINT`	The total length of the database key.For a table: 8 bytes.For a view, the length is 8 multiplied by the number of tables referenced by the view
`RDB$FORMAT`	`SMALLINT`	Internal use, points to the relation’s record in `RDB$FORMATS` — do not modify
`RDB$FIELD_ID`	`SMALLINT`	The field ID for the next column to be added.The number is not decremented when a column is dropped.
`RDB$RELATION_NAME`	`CHAR(63)`	Table or view name
`RDB$SECURITY_CLASS`	`CHAR(63)`	May reference a security class defined in the table `RDB$SECURITY_CLASSES`, to apply access control limits to all users of this table or view
`RDB$EXTERNAL_FILE`	`VARCHAR(255)`	The full path to the external data file if the table is defined with the `EXTERNAL FILE` clause
`RDB$RUNTIME`	`BLOB`	Table metadata description, used internally for optimization
`RDB$EXTERNAL_DESCRIPTION`	`BLOB`	Could store comments related to the external file of an external table
`RDB$OWNER_NAME`	`CHAR(63)`	The username of the user who created the table or view originally
`RDB$DEFAULT_CLASS`	`CHAR(63)`	Default security class, used when a new column is added to the table
`RDB$FLAGS`	`SMALLINT`	Internal flags
`RDB$RELATION_TYPE`	`SMALLINT`	The type of the relation object being described: `0` - system or user-defined table `1` - view `2` - external table `3` - monitoring table `4` - connection-level GTT (`PRESERVE ROWS`) `5` - transaction-level GTT (`DELETE ROWS`)
`RDB$SQL_SECURITY`	`BOOLEAN`	The `SQL SECURITY` mode (`DEFINER` or `INVOKER`): `NULL` - initial default (`INVOKER`) `FALSE` - `INVOKER` `TRUE` - `DEFINER`

RDB$VIEW_BLR

BLOB BLR

The binary language representation (BLR) of the query specification of a view.The field stores NULL for a table

RDB$VIEW_SOURCE

BLOB TEXT

Contains the original source text of the query for a view, in SQL language.User comments are included.The field stores NULL for a table

RDB$DESCRIPTION

BLOB TEXT

Could store comments related to the table or view

RDB$RELATION_ID

SMALLINT

Internal identifier of the table or view

RDB$SYSTEM_FLAG

SMALLINT

indicates whether the table or view is user-defined (value 0) or system-defined (value 1 or greater)

RDB$DBKEY_LENGTH

SMALLINT

The total length of the database key.For a table: 8 bytes.For a view, the length is 8 multiplied by the number of tables referenced by the view

RDB$FORMAT

SMALLINT

Internal use, points to the relation’s record in RDB$FORMATS — do not modify

RDB$FIELD_ID

SMALLINT

The field ID for the next column to be added.The number is not decremented when a column is dropped.

RDB$RELATION_NAME

CHAR(63)

Table or view name

RDB$SECURITY_CLASS

CHAR(63)

May reference a security class defined in the table RDB$SECURITY_CLASSES, to apply access control limits to all users of this table or view

RDB$EXTERNAL_FILE

VARCHAR(255)

The full path to the external data file if the table is defined with the EXTERNAL FILE clause

RDB$RUNTIME

BLOB

Table metadata description, used internally for optimization

RDB$EXTERNAL_DESCRIPTION

BLOB

Could store comments related to the external file of an external table

RDB$OWNER_NAME

CHAR(63)

The username of the user who created the table or view originally

RDB$DEFAULT_CLASS

CHAR(63)

Default security class, used when a new column is added to the table

RDB$FLAGS

SMALLINT

Internal flags

RDB$RELATION_TYPE

SMALLINT

The type of the relation object being described:

0 - system or user-defined table
1 - view
2 - external table
3 - monitoring table
4 - connection-level GTT (PRESERVE ROWS)
5 - transaction-level GTT (DELETE ROWS)

RDB$SQL_SECURITY

BOOLEAN

The SQL SECURITY mode (DEFINER or INVOKER):

NULL - initial default (INVOKER)
FALSE - INVOKER
TRUE - DEFINER

`RDB$RELATION_CONSTRAINTS`

RDB$RELATION_CONSTRAINTS stores the definitions of all table-level constraints: primary, unique, foreign key, CHECK, NOT NULL constraints.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$CONSTRAINT_NAME`	`CHAR(63)`	The name of the table-level constraint defined by the user, or otherwise automatically generated by the system
`RDB$CONSTRAINT_TYPE`	`CHAR(11)`	The name of the constraint type: `PRIMARY KEY`, `UNIQUE`, `FOREIGN KEY`, `CHECK` or `NOT NULL`
`RDB$RELATION_NAME`	`CHAR(63)`	The name of the table this constraint applies to
`RDB$DEFERRABLE`	`CHAR(3)`	Currently `NO` in all cases: Firebird does not yet support deferrable constraints
`RDB$INITIALLY_DEFERRED`	`CHAR(3)`	Currently `NO` in all cases
`RDB$INDEX_NAME`	`CHAR(63)`	The name of the index that supports this constraint.For a `CHECK` or a `NOT NULL` constraint, it is `NULL`.

RDB$CONSTRAINT_NAME

CHAR(63)

The name of the table-level constraint defined by the user, or otherwise automatically generated by the system

RDB$CONSTRAINT_TYPE

CHAR(11)

The name of the constraint type: PRIMARY KEY, UNIQUE, FOREIGN KEY, CHECK or NOT NULL

RDB$RELATION_NAME

CHAR(63)

The name of the table this constraint applies to

RDB$DEFERRABLE

CHAR(3)

Currently NO in all cases: Firebird does not yet support deferrable constraints

RDB$INITIALLY_DEFERRED

CHAR(3)

Currently NO in all cases

RDB$INDEX_NAME

CHAR(63)

The name of the index that supports this constraint.For a CHECK or a NOT NULL constraint, it is NULL.

`RDB$RELATION_FIELDS`

RDB$RELATION_FIELDS stores the definitions of table and view columns.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$FIELD_NAME`	`CHAR(63)`	Column name
`RDB$RELATION_NAME`	`CHAR(63)`	The name of the table or view that the column belongs to
`RDB$FIELD_SOURCE`	`CHAR(63)`	Domain name on which the column is based, either a user-defined one specified in the table definition or one created automatically by the system using the set of attributes defined.The attributes are in the table `RDB$FIELDS`: this column matches `RDB$FIELDS.RDB$FIELD_NAME`.
`RDB$QUERY_NAME`	`CHAR(63)`	Not currently used
`RDB$BASE_FIELD`	`CHAR(63)`	Only populated for a view, it is the name of the column from the base table
`RDB$EDIT_STRING`	`VARCHAR(127)`	Not used
`RDB$FIELD_POSITION`	`SMALLINT`	The zero-based ordinal position of the column in the table or view, numbering from left to right
`RDB$QUERY_HEADER`	`BLOB TEXT`	Not used
`RDB$UPDATE_FLAG`	`SMALLINT`	Indicates whether the column is a regular one (value 1) or a computed one (value 0)
`RDB$FIELD_ID`	`SMALLINT`	An ID assigned from `RDB$RELATIONS.RDB$FIELD_ID` at the time the column was added to the table or view.It should always be treated as transient
`RDB$VIEW_CONTEXT`	`SMALLINT`	For a view column, the internal identifier of the base table from which this field derives
`RDB$DESCRIPTION`	`BLOB TEXT`	Comments related to the table or view column
`RDB$DEFAULT_VALUE`	`BLOB BLR`	The binary language representation (BLR) of the default value of the column
`RDB$SYSTEM_FLAG`	`SMALLINT`	Indicates whether the column is user-defined (value 0) or system-defined (value 1 or greater)
`RDB$SECURITY_CLASS`	`CHAR(63)`	May reference a security class defined in `RDB$SECURITY_CLASSES`, to apply access control limits to all users of this column
`RDB$COMPLEX_NAME`	`CHAR(63)`	Not used
`RDB$NULL_FLAG`	`SMALLINT`	Indicates whether the column is nullable (`NULL`) non-nullable (value 1)
`RDB$DEFAULT_SOURCE`	`BLOB TEXT`	The source text of the `DEFAULT` clause, if any
`RDB$COLLATION_ID`	`SMALLINT`	The identifier of the collation in the character set for the column, if it is not the default collation
`RDB$GENERATOR_NAME`	`CHAR(63)`	Internal generator name for generating an identity value for the column.
`RDB$IDENTITY_TYPE`	`SMALLINT`	The identity type of the column `NULL` - not an identity column `0` - identity column, `GENERATED ALWAYS` `1` - identity column, `GENERATED BY DEFAULT`

RDB$FIELD_NAME

CHAR(63)

Column name

RDB$RELATION_NAME

CHAR(63)

The name of the table or view that the column belongs to

RDB$FIELD_SOURCE

CHAR(63)

Domain name on which the column is based, either a user-defined one specified in the table definition or one created automatically by the system using the set of attributes defined.The attributes are in the table RDB$FIELDS: this column matches RDB$FIELDS.RDB$FIELD_NAME.

RDB$QUERY_NAME

CHAR(63)

Not currently used

RDB$BASE_FIELD

CHAR(63)

Only populated for a view, it is the name of the column from the base table

RDB$EDIT_STRING

VARCHAR(127)

Not used

RDB$FIELD_POSITION

SMALLINT

The zero-based ordinal position of the column in the table or view, numbering from left to right

RDB$QUERY_HEADER

BLOB TEXT

Not used

RDB$UPDATE_FLAG

SMALLINT

Indicates whether the column is a regular one (value 1) or a computed one (value 0)

RDB$FIELD_ID

SMALLINT

An ID assigned from RDB$RELATIONS.RDB$FIELD_ID at the time the column was added to the table or view.It should always be treated as transient

RDB$VIEW_CONTEXT

SMALLINT

For a view column, the internal identifier of the base table from which this field derives

RDB$DESCRIPTION

BLOB TEXT

Comments related to the table or view column

RDB$DEFAULT_VALUE

BLOB BLR

The binary language representation (BLR) of the default value of the column

RDB$SYSTEM_FLAG

SMALLINT

Indicates whether the column is user-defined (value 0) or system-defined (value 1 or greater)

RDB$SECURITY_CLASS

CHAR(63)

May reference a security class defined in RDB$SECURITY_CLASSES, to apply access control limits to all users of this column

RDB$COMPLEX_NAME

CHAR(63)

Not used

RDB$NULL_FLAG

SMALLINT

Indicates whether the column is nullable (NULL) non-nullable (value 1)

RDB$DEFAULT_SOURCE

BLOB TEXT

The source text of the DEFAULT clause, if any

RDB$COLLATION_ID

SMALLINT

The identifier of the collation in the character set for the column, if it is not the default collation

RDB$GENERATOR_NAME

CHAR(63)

Internal generator name for generating an identity value for the column.

RDB$IDENTITY_TYPE

SMALLINT

The identity type of the column

NULL - not an identity column
0 - identity column, GENERATED ALWAYS
1 - identity column, GENERATED BY DEFAULT

`RDB$ROLES`

RDB$ROLES stores the roles that have been defined in this database.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$ROLE_NAME`	`CHAR(63)`	Role name
`RDB$OWNER_NAME`	`CHAR(63)`	The username of the role owner
`RDB$DESCRIPTION`	`BLOB TEXT`	Could store comments related to the role
`RDB$SYSTEM_FLAG`	`SMALLINT`	System flag
`RDB$SECURITY_CLASS`	`CHAR(63)`	May reference a security class defined in the table `RDB$SECURITY_CLASSES`, to apply access control limits to all users of this role
`RDB$SYSTEM_PRIVILEGES`	`BINARY(8)`	Bitset with the system privileges granted to a role, with the following bits 0 - unused 1 - `USER_MANAGEMENT` 2 - `READ_RAW_PAGES` 3 - `CREATE_USER_TYPES` 4 - `USE_NBACKUP_UTILITY` 5 - `CHANGE_SHUTDOWN_MODE` 6 - `TRACE_ANY_ATTACHMENT` 7 - `MONITOR_ANY_ATTACHMENT` 8 - `ACCESS_SHUTDOWN_DATABASE` 9 - `CREATE_DATABASE` 10 - `DROP_DATABASE` 11 - `USE_GBAK_UTILITY` 12 - `USE_GSTAT_UTILITY` 13 - `USE_GFIX_UTILITY` 14 - `IGNORE_DB_TRIGGERS` 15 - `CHANGE_HEADER_SETTINGS` 16 - `SELECT_ANY_OBJECT_IN_DATABASE` 17 - `ACCESS_ANY_OBJECT_IN_DATABASE` 18 - `MODIFY_ANY_OBJECT_IN_DATABASE` 19 - `CHANGE_MAPPING_RULES` 20 - `USE_GRANTED_BY_CLAUSE` 21 - `GRANT_REVOKE_ON_ANY_OBJECT` 22 - `GRANT_REVOKE_ANY_DDL_RIGHT` 23 - `CREATE_PRIVILEGED_ROLES` 24 - `GET_DBCRYPT_INFO` 25 - `MODIFY_EXT_CONN_POOL` 26 - `REPLICATE_INTO_DATABASE` 27 - `PROFILE_ANY_ATTACHMENT`

RDB$ROLE_NAME

CHAR(63)

Role name

RDB$OWNER_NAME

CHAR(63)

The username of the role owner

RDB$DESCRIPTION

BLOB TEXT

Could store comments related to the role

RDB$SYSTEM_FLAG

SMALLINT

System flag

RDB$SECURITY_CLASS

CHAR(63)

May reference a security class defined in the table RDB$SECURITY_CLASSES, to apply access control limits to all users of this role

RDB$SYSTEM_PRIVILEGES

BINARY(8)

Bitset with the system privileges granted to a role, with the following bits

0 - unused
1 - USER_MANAGEMENT
2 - READ_RAW_PAGES
3 - CREATE_USER_TYPES
4 - USE_NBACKUP_UTILITY
5 - CHANGE_SHUTDOWN_MODE
6 - TRACE_ANY_ATTACHMENT
7 - MONITOR_ANY_ATTACHMENT
8 - ACCESS_SHUTDOWN_DATABASE
9 - CREATE_DATABASE
10 - DROP_DATABASE
11 - USE_GBAK_UTILITY
12 - USE_GSTAT_UTILITY
13 - USE_GFIX_UTILITY
14 - IGNORE_DB_TRIGGERS
15 - CHANGE_HEADER_SETTINGS
16 - SELECT_ANY_OBJECT_IN_DATABASE
17 - ACCESS_ANY_OBJECT_IN_DATABASE
18 - MODIFY_ANY_OBJECT_IN_DATABASE
19 - CHANGE_MAPPING_RULES
20 - USE_GRANTED_BY_CLAUSE
21 - GRANT_REVOKE_ON_ANY_OBJECT
22 - GRANT_REVOKE_ANY_DDL_RIGHT
23 - CREATE_PRIVILEGED_ROLES
24 - GET_DBCRYPT_INFO
25 - MODIFY_EXT_CONN_POOL
26 - REPLICATE_INTO_DATABASE
27 - PROFILE_ANY_ATTACHMENT

`RDB$SECURITY_CLASSES`

RDB$SECURITY_CLASSES stores the access control lists

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$SECURITY_CLASS`	`CHAR(63)`	Security class name
`RDB$ACL`	`BLOB ACL`	The access control list related to the security class.It enumerates users and their privileges
`RDB$DESCRIPTION`	`BLOB TEXT`	Could store comments related to the security class

RDB$SECURITY_CLASS

CHAR(63)

Security class name

RDB$ACL

BLOB ACL

The access control list related to the security class.It enumerates users and their privileges

RDB$DESCRIPTION

BLOB TEXT

Could store comments related to the security class

`RDB$TIME_ZONES`

RDB$TIME_ZONES lists the named time zones supported by the engine.It is a virtual table that is populated using the current time zone database of the Firebird engine.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$TIME_ZONE_ID`	`INTEGER`	The unique identifier of the time zone as used by Firebird.For example, this identifier is used in the `time_zone` field of the `ISC_TIMESTAMP_TZ` struct if the value has a named zone instead of an offset.
`RDB$TIME_ZONE_NAME`	`CHAR(63)`	Name of the time zone as specified by the time zone database

RDB$TIME_ZONE_ID

INTEGER

The unique identifier of the time zone as used by Firebird.For example, this identifier is used in the time_zone field of the ISC_TIMESTAMP_TZ struct if the value has a named zone instead of an offset.

RDB$TIME_ZONE_NAME

CHAR(63)

Name of the time zone as specified by the time zone database

`RDB$TRANSACTIONS`

RDB$TRANSACTIONS stores the states of distributed transactions and other transactions that were prepared for two-phase commit with an explicit prepare message.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$TRANSACTION_ID`	`INTEGER`	The unique identifier of the transaction being tracked
`RDB$TRANSACTION_STATE`	`SMALLINT`	Transaction state: `0` - in limbo `1` - committed `2` - rolled back
`RDB$TIMESTAMP`	`TIMESTAMP WITH TIME ZONE`	Not used
`RDB$TRANSACTION_DESCRIPTION`	`BLOB`	Describes the prepared transaction and could be a custom message supplied to `isc_prepare_transaction2`, even if it is not a distributed transaction.It may be used when a lost connection cannot be restored

RDB$TRANSACTION_ID

INTEGER

The unique identifier of the transaction being tracked

RDB$TRANSACTION_STATE

SMALLINT

Transaction state:

0 - in limbo
1 - committed
2 - rolled back

RDB$TIMESTAMP

TIMESTAMP WITH TIME ZONE

Not used

RDB$TRANSACTION_DESCRIPTION

BLOB

Describes the prepared transaction and could be a custom message supplied to isc_prepare_transaction2, even if it is not a distributed transaction.It may be used when a lost connection cannot be restored

`RDB$TRIGGERS`

RDB$TRIGGERS stores the trigger definitions for all tables and views.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$TRIGGER_NAME`	`CHAR(63)`	Trigger name
`RDB$RELATION_NAME`	`CHAR(63)`	The name of the table or view the trigger applies to.NULL if the trigger is applicable to a database event (“database trigger”)
`RDB$TRIGGER_SEQUENCE`	`SMALLINT`	Position of this trigger in the sequence.Zero usually means that no sequence position is specified
`RDB$TRIGGER_TYPE`	`BIGINT`	The event the trigger fires on, see [fblangref-appx04-triggers-type]
`RDB$TRIGGER_SOURCE`	`BLOB TEXT`	Stores the source code of the trigger in PSQL
`RDB$TRIGGER_BLR`	`BLOB BLR`	The binary language representation (BLR) of the trigger code (PSQL trigger only)
`RDB$DESCRIPTION`	`BLOB TEXT`	Trigger comment text
`RDB$TRIGGER_INACTIVE`	`SMALLINT`	Indicates whether the trigger is currently inactive (1) or active (0)
`RDB$SYSTEM_FLAG`	`SMALLINT`	Flag: indicates whether the trigger is user-defined (value 0) or system-defined (value 1 or greater)
`RDB$FLAGS`	`SMALLINT`	Internal use
`RDB$VALID_BLR`	`SMALLINT`	Indicates whether the text of the trigger remains valid after the latest modification by the `ALTER TRIGGER` statement
`RDB$DEBUG_INFO`	`BLOB`	Contains debugging information about variables used in the trigger
`RDB$ENGINE_NAME`	`CHAR(63)`	Engine for external triggers.`'UDR'` for UDR triggers.`NULL` for PSQL triggers
`RDB$ENTRYPOINT`	`CHAR(255)`	The exported name of the external trigger in the trigger library.Note, this is often not the same as `RDB$TRIGGER_NAME`, which is the identifier with which the trigger is declared to the database
`RDB$SQL_SECURITY`	`BOOLEAN`	The `SQL SECURITY` mode (`DEFINER` or `INVOKER`): `NULL` - initial default (`INVOKER`) `FALSE` - `INVOKER` `TRUE` - `DEFINER`

RDB$TRIGGER_NAME

CHAR(63)

Trigger name

RDB$RELATION_NAME

CHAR(63)

The name of the table or view the trigger applies to.NULL if the trigger is applicable to a database event (“database trigger”)

RDB$TRIGGER_SEQUENCE

SMALLINT

Position of this trigger in the sequence.Zero usually means that no sequence position is specified

RDB$TRIGGER_TYPE

BIGINT

The event the trigger fires on, see [fblangref-appx04-triggers-type]

RDB$TRIGGER_SOURCE

BLOB TEXT

Stores the source code of the trigger in PSQL

RDB$TRIGGER_BLR

BLOB BLR

The binary language representation (BLR) of the trigger code (PSQL trigger only)

RDB$DESCRIPTION

BLOB TEXT

Trigger comment text

RDB$TRIGGER_INACTIVE

SMALLINT

Indicates whether the trigger is currently inactive (1) or active (0)

RDB$SYSTEM_FLAG

SMALLINT

Flag: indicates whether the trigger is user-defined (value 0) or system-defined (value 1 or greater)

RDB$FLAGS

SMALLINT

Internal use

RDB$VALID_BLR

SMALLINT

Indicates whether the text of the trigger remains valid after the latest modification by the ALTER TRIGGER statement

RDB$DEBUG_INFO

BLOB

Contains debugging information about variables used in the trigger

RDB$ENGINE_NAME

CHAR(63)

Engine for external triggers.'UDR' for UDR triggers.NULL for PSQL triggers

RDB$ENTRYPOINT

CHAR(255)

The exported name of the external trigger in the trigger library.Note, this is often not the same as RDB$TRIGGER_NAME, which is the identifier with which the trigger is declared to the database

RDB$SQL_SECURITY

BOOLEAN

The SQL SECURITY mode (DEFINER or INVOKER):

NULL - initial default (INVOKER)
FALSE - INVOKER
TRUE - DEFINER

`RDB$TRIGGER_TYPE` Value

The value of RDB$TRIGGER_TYPE is built from:

`1`	before insert
`2`	after insert
`3`	before update
`4`	after update
`5`	before delete
`6`	after delete
`17`	before insert or update
`18`	after insert or update
`25`	before insert or delete
`26`	after insert or delete
`27`	before update or delete
`28`	after update or delete
`113`	before insert or update or delete
`114`	after insert or update or delete
`8192`	on connect
`8193`	on disconnect
`8194`	on transaction start
`8195`	on transaction commit
`8196`	on transaction rollback

Note	Identification of the exact `RDB$TRIGGER_TYPE` code is a little more complicated, since it is a bitmap, calculated according to which phase and events are covered and the order in which they are defined.For the curious, the calculation is explained in this code comment by Mark Rotteveel.

For DDL triggers, the trigger type is obtained by bitwise OR above the event phase (0 — BEFORE, 1 — AFTER) and all listed types events:

`0x0000000000004002`	`CREATE TABLE`
`0x0000000000004004`	`ALTER TABLE`
`0x0000000000004008`	`DROP TABLE`
`0x0000000000004010`	`CREATE PROCEDURE`
`0x0000000000004020`	`ALTER PROCEDURE`
`0x0000000000004040`	`DROP PROCEDURE`
`0x0000000000004080`	`CREATE FUNCTION`
`0x0000000000004100`	`ALTER FUNCTION`
`0x0000000000004200`	`DROP FUNCTION`
`0x0000000000004400`	`CREATE TRIGGER`
`0x0000000000004800`	`ALTER TRIGGER`
`0x0000000000005000`	`DROP TRIGGER`
`0x0000000000014000`	`CREATE EXCEPTION`
`0x0000000000024000`	`ALTER EXCEPTION`
`0x0000000000044000`	`DROP EXCEPTION`
`0x0000000000084000`	`CREATE VIEW`
`0x0000000000104000`	`ALTER VIEW`
`0x0000000000204000`	`DROP VIEW`
`0x0000000000404000`	`CREATE DOMAIN`
`0x0000000000804000`	`ALTER DOMAIN`
`0x0000000001004000`	`DROP DOMAIN`
`0x0000000002004000`	`CREATE ROLE`
`0x0000000004004000`	`ALTER ROLE`
`0x0000000008004000`	`DROP ROLE`
`0x0000000010004000`	`CREATE INDEX`
`0x0000000020004000`	`ALTER INDEX`
`0x0000000040004000`	`DROP INDEX`
`0x0000000080004000`	`CREATE SEQUENCE`
`0x0000000100004000`	`ALTER SEQUENCE`
`0x0000000200004000`	`DROP SEQUENCE`
`0x0000000400004000`	`CREATE USER`
`0x0000000800004000`	`ALTER USER`
`0x0000001000004000`	`DROP USER`
`0x0000002000004000`	`CREATE COLLATION`
`0x0000004000004000`	`DROP COLLATION`
`0x0000008000004000`	`ALTER CHARACTER SET`
`0x0000010000004000`	`CREATE PACKAGE`
`0x0000020000004000`	`ALTER PACKAGE`
`0x0000040000004000`	`DROP PACKAGE`
`0x0000080000004000`	`CREATE PACKAGE BODY`
`0x0000100000004000`	`DROP PACKAGE BODY`
`0x0000200000004000`	`CREATE MAPPING`
`0x0000400000004000`	`ALTER MAPPING`
`0x0000800000004000`	`DROP MAPPING`
`0x7FFFFFFFFFFFDFFE`	`ANY DDL STATEMENT`

For example a trigger with
BEFORE CREATE PROCEDURE OR CREATE FUNCTION will be of type 0x0000000000004090,
AFTER CREATE PROCEDURE OR CREATE FUNCTION — 0x0000000000004091,
BEFORE DROP FUNCTION OR DROP EXCEPTION — 0x00000000000044200,
AFTER DROP FUNCTION OR DROP EXCEPTION — 0x00000000000044201,
BEFORE DROP TRIGGER OR DROP DOMAIN — 0x00000000001005000,
AFTER DROP TRIGGER OR DROP DOMAIN — 0x00000000001005001.

`RDB$TRIGGER_MESSAGES`

RDB$TRIGGER_MESSAGES stores the trigger messages.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$TRIGGER_NAME`	`CHAR(63)`	The name of the trigger the message is associated with
`RDB$MESSAGE_NUMBER`	`SMALLINT`	The number of the message within this trigger (from 1 to 32,767)
`RDB$MESSAGE`	`VARCHAR(1023)`	Text of the trigger message

RDB$TRIGGER_NAME

CHAR(63)

The name of the trigger the message is associated with

RDB$MESSAGE_NUMBER

SMALLINT

The number of the message within this trigger (from 1 to 32,767)

RDB$MESSAGE

VARCHAR(1023)

Text of the trigger message

`RDB$TYPES`

RDB$TYPES stores the defining sets of enumerated types used throughout the system.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$FIELD_NAME`	`CHAR(63)`	Enumerated type name.Each type name masters its own set of types, e.g., object types, data types, character sets, trigger types, blob subtypes, etc.
`RDB$TYPE`	`SMALLINT`	The object type identifier.A unique series of numbers is used within each separate enumerated type.For example, for the `RDB$OBJECT_TYPE` enumerated type, examples of object types are: `0` - TABLE `1` - VIEW `2` - TRIGGER …
`RDB$TYPE_NAME`	`CHAR(63)`	The name of a member of an enumerated type, e.g., TABLE, VIEW, TRIGGER, etc. in the example above.In the `RDB$CHARACTER_SET` enumerated type, `RDB$TYPE_NAME` stores the names of the character sets.
`RDB$DESCRIPTION`	`BLOB TEXT`	Any text comments related to the enumerated type
`RDB$SYSTEM_FLAG`	`SMALLINT`	Flag: indicates whether the type-member is user-defined (value 0) or system-defined (value 1 or greater)

RDB$FIELD_NAME

CHAR(63)

Enumerated type name.Each type name masters its own set of types, e.g., object types, data types, character sets, trigger types, blob subtypes, etc.

RDB$TYPE

SMALLINT

The object type identifier.A unique series of numbers is used within each separate enumerated type.For example, for the RDB$OBJECT_TYPE enumerated type, examples of object types are:

0 - TABLE
1 - VIEW
2 - TRIGGER
…

RDB$TYPE_NAME

CHAR(63)

The name of a member of an enumerated type, e.g., TABLE, VIEW, TRIGGER, etc. in the example above.In the RDB$CHARACTER_SET enumerated type, RDB$TYPE_NAME stores the names of the character sets.

RDB$DESCRIPTION

BLOB TEXT

Any text comments related to the enumerated type

RDB$SYSTEM_FLAG

SMALLINT

Flag: indicates whether the type-member is user-defined (value 0) or system-defined (value 1 or greater)

`RDB$CHECK_CONSTRAINTS`

RDB$CHECK_CONSTRAINTS provides the cross references between the names of system-generated triggers for constraints and the names of the associated constraints (NOT NULL constraints, CHECK constraints and the ON UPDATE and ON DELETE clauses in foreign key constraints).

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$CONSTRAINT_NAME`	`CHAR(63)`	Constraint name, defined by the user or automatically generated by the system
`RDB$TRIGGER_NAME`	`CHAR(63)`	For a `CHECK` constraint, it is the name of the trigger that enforces this constraint.For a `NOT NULL` constraint, it is the name of the table the constraint is applied to.For a foreign key constraint, it is the name of the trigger that enforces the `ON UPDATE`, `ON DELETE` clauses.

RDB$CONSTRAINT_NAME

CHAR(63)

Constraint name, defined by the user or automatically generated by the system

RDB$TRIGGER_NAME

CHAR(63)

For a CHECK constraint, it is the name of the trigger that enforces this constraint.For a NOT NULL constraint, it is the name of the table the constraint is applied to.For a foreign key constraint, it is the name of the trigger that enforces the ON UPDATE, ON DELETE clauses.

`RDB$USER_PRIVILEGES`

RDB$USER_PRIVILEGES stores the SQL access privileges for Firebird users and privileged objects.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$USER`	`CHAR(63)`	The user or object that is granted this privilege
`RDB$GRANTOR`	`CHAR(63)`	The user who grants the privilege
`RDB$PRIVILEGE`	`CHAR(6)`	The privilege granted hereby: `A` - all (all privileges) `S` - select (selecting data) `I` - insert (inserting rows) `D` - delete (deleting rows) `R` - references (foreign key) `U` - update (updating data) `X` - executing (procedure) `G` - usage (of other object types) `M` - role membership `C` - DDL privilege create `L` - DDL privilege alter `O` - DDL privilege drop
`RDB$GRANT_OPTION`	`SMALLINT`	Whether the WITH GRANT OPTION authority is included with the privilege: `0` - not included `1` - included
`RDB$RELATION_NAME`	`CHAR(63)`	The name of the object (table, view, procedure or role) the privilege is granted ON
`RDB$FIELD_NAME`	`CHAR(63)`	The name of the column the privilege is applicable to, for a column-level privilege (an `UPDATE` or `REFERENCES` privilege)
`RDB$USER_TYPE`	`SMALLINT`	Identifies the type of user the privilege is granted TO (a user, a procedure, a view, etc.)
`RDB$OBJECT_TYPE`	`SMALLINT`	Identifies the type of the object the privilege is granted ON `0` - table `1` - view `2` - trigger `5` - procedure `7` - exception `8` - user `9` - domain `11` - character set `13` - role `14` - generator (sequence) `15` - function `16` - BLOB filter `17` - collation `18` - package

RDB$USER

CHAR(63)

The user or object that is granted this privilege

RDB$GRANTOR

CHAR(63)

The user who grants the privilege

RDB$PRIVILEGE

CHAR(6)

The privilege granted hereby:

A - all (all privileges)
S - select (selecting data)
I - insert (inserting rows)
D - delete (deleting rows)
R - references (foreign key)
U - update (updating data)
X - executing (procedure)
G - usage (of other object types)
M - role membership
C - DDL privilege create
L - DDL privilege alter
O - DDL privilege drop

RDB$GRANT_OPTION

SMALLINT

Whether the WITH GRANT OPTION authority is included with the privilege:

0 - not included
1 - included

RDB$RELATION_NAME

CHAR(63)

The name of the object (table, view, procedure or role) the privilege is granted ON

RDB$FIELD_NAME

CHAR(63)

The name of the column the privilege is applicable to, for a column-level privilege (an UPDATE or REFERENCES privilege)

RDB$USER_TYPE

SMALLINT

Identifies the type of user the privilege is granted TO (a user, a procedure, a view, etc.)

RDB$OBJECT_TYPE

SMALLINT

Identifies the type of the object the privilege is granted ON

0 - table
1 - view
2 - trigger
5 - procedure
7 - exception
8 - user
9 - domain
11 - character set
13 - role
14 - generator (sequence)
15 - function
16 - BLOB filter
17 - collation
18 - package

`RDB$VIEW_RELATIONS`

RDB$VIEW_RELATIONS stores the tables that are referred to in view definitions.There is one record for each table in a view.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$VIEW_NAME`	`CHAR(63)`	View name
`RDB$RELATION_NAME`	`CHAR(63)`	The name of the table, view or stored procedure the view references
`RDB$VIEW_CONTEXT`	`SMALLINT`	The alias used to reference the view column in the BLR code of the query definition
`RDB$CONTEXT_NAME`	`CHAR(255)`	The text associated with the alias reported in the `RDB$VIEW_CONTEXT` column
`RDB$CONTEXT_TYPE`	`SMALLINT`	Context type: `0` - table `1` - view `2` - stored procedure
`RDB$PACKAGE_NAME`	`CHAR(63)`	Package name for a stored procedure in a package

RDB$VIEW_NAME

CHAR(63)

View name

RDB$RELATION_NAME

CHAR(63)

The name of the table, view or stored procedure the view references

RDB$VIEW_CONTEXT

SMALLINT

The alias used to reference the view column in the BLR code of the query definition

RDB$CONTEXT_NAME

CHAR(255)

The text associated with the alias reported in the RDB$VIEW_CONTEXT column

RDB$CONTEXT_TYPE

SMALLINT

Context type:

0 - table
1 - view
2 - stored procedure

RDB$PACKAGE_NAME

CHAR(63)

Package name for a stored procedure in a package

`RDB$COLLATIONS`

RDB$COLLATIONS stores collations for all character sets.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$COLLATION_NAME`	`CHAR(63)`	Collation name
`RDB$COLLATION_ID`	`SMALLINT`	Collation identifier.Together with the character set identifier, it is a unique collation identifier
`RDB$CHARACTER_SET_ID`	`SMALLINT`	Character set identifier.Together with the collection sequence identifier, it is a unique identifier
`RDB$COLLATION_ATTRIBUTES`	`SMALLINT`	Collation attributes.It is a bit mask where the first bit shows whether trailing spaces should be taken into account in collations (0 - NO PAD; 1 - PAD SPACE);the second bit shows whether the collation is case-sensitive (0 - CASE SENSITIVE, 1 - CASE INSENSITIVE);the third bit shows whether the collation is accent-sensitive (0 - ACCENT SENSITIVE, 1 - ACCENT SENSITIVE).Thus, the value of 5 means that the collation does not take into account trailing spaces and is accent-insensitive
`RDB$SYSTEM_FLAG`	`SMALLINT`	Flag: the value of 0 means it is user-defined;the value of 1 means it is system-defined
`RDB$DESCRIPTION`	`BLOB TEXT`	Could store text description of the collation
`RDB$FUNCTION_NAME`	`CHAR(63)`	Not currently used
`RDB$BASE_COLLATION_NAME`	`CHAR(63)`	The name of the base collation for this collation
`RDB$SPECIFIC_ATTRIBUTES`	`BLOB TEXT`	Describes specific attributes
`RDB$SECURITY_CLASS`	`CHAR(63)`	May reference a security class defined in the table `RDB$SECURITY_CLASSES`, to apply access control limits to all users of this collation
`RDB$OWNER_NAME`	`CHAR(63)`	The username of the user who created the collation originally

RDB$COLLATION_NAME

CHAR(63)

Collation name

RDB$COLLATION_ID

SMALLINT

Collation identifier.Together with the character set identifier, it is a unique collation identifier

RDB$CHARACTER_SET_ID

SMALLINT

Character set identifier.Together with the collection sequence identifier, it is a unique identifier

RDB$COLLATION_ATTRIBUTES

SMALLINT

Collation attributes.It is a bit mask where the first bit shows whether trailing spaces should be taken into account in collations (0 - NO PAD; 1 - PAD SPACE);the second bit shows whether the collation is case-sensitive (0 - CASE SENSITIVE, 1 - CASE INSENSITIVE);the third bit shows whether the collation is accent-sensitive (0 - ACCENT SENSITIVE, 1 - ACCENT SENSITIVE).Thus, the value of 5 means that the collation does not take into account trailing spaces and is accent-insensitive

RDB$SYSTEM_FLAG

SMALLINT

Flag: the value of 0 means it is user-defined;the value of 1 means it is system-defined

RDB$DESCRIPTION

BLOB TEXT

Could store text description of the collation

RDB$FUNCTION_NAME

CHAR(63)

Not currently used

RDB$BASE_COLLATION_NAME

CHAR(63)

The name of the base collation for this collation

RDB$SPECIFIC_ATTRIBUTES

BLOB TEXT

Describes specific attributes

RDB$SECURITY_CLASS

CHAR(63)

May reference a security class defined in the table RDB$SECURITY_CLASSES, to apply access control limits to all users of this collation

RDB$OWNER_NAME

CHAR(63)

The username of the user who created the collation originally

`RDB$CONFIG`

RDB$CONFIG is a virtual table showing the configuration settings of the current database for the current connection.

Table RDB$CONFIG is populated from in-memory structures upon request and its instance is preserved for the SQL query lifetime.For security reasons, access to this table is allowed for administrators only.Non-privileged users see no rows in this table (and no error is raised).

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$CONFIG_ID`	`INTEGER`	Unique row identifier, no special meaning
`RDB$CONFIG_NAME`	`VARCHAR(63)`	Setting name (e.g. `TempCacheLimit`)
`RDB$CONFIG_VALUE`	`VARCHAR(255)`	Actual value of setting
`RDB$CONFIG_DEFAULT`	`VARCHAR(255)`	Default value of setting (defined in the Firebird code)
`RDB$CONFIG_IS_SET`	`BOOLEAN`	TRUE if value is explicitly configured, FALSE when default
`RDB$CONFIG_SOURCE`	`VARCHAR(255)`	Name of the configuration file (relative to the Firebird root directory) where this setting was taken from, or special value `DPB` if the setting was specified by the client application via API.

RDB$CONFIG_ID

INTEGER

Unique row identifier, no special meaning

RDB$CONFIG_NAME

VARCHAR(63)

Setting name (e.g. TempCacheLimit)

RDB$CONFIG_VALUE

VARCHAR(255)

Actual value of setting

RDB$CONFIG_DEFAULT

VARCHAR(255)

Default value of setting (defined in the Firebird code)

RDB$CONFIG_IS_SET

BOOLEAN

TRUE if value is explicitly configured, FALSE when default

RDB$CONFIG_SOURCE

VARCHAR(255)

Name of the configuration file (relative to the Firebird root directory) where this setting was taken from, or special value DPB if the setting was specified by the client application via API.

`RDB$DATABASE`

RDB$DATABASE stores basic information about the database.It contains only one record.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$DESCRIPTION`	`BLOB TEXT`	Database comment text
`RDB$RELATION_ID`	`SMALLINT`	A number that steps up by one each time a table or view is added to the database
`RDB$SECURITY_CLASS`	`CHAR(63)`	The security class defined in `RDB$SECURITY_CLASSES` to apply access control limits common to the entire database
`RDB$CHARACTER_SET_NAME`	`CHAR(63)`	The name of the default character set for the database set in the `DEFAULT CHARACTER SET` clause when the database is created.`NULL` for character set `NONE`.
`RDB$LINGER`	`INTEGER`	Number of seconds "delay" (established with the `ALTER DATABASE SET LINGER` statement) until the database file is closed after the last connection to this database is closed (in SuperServer).`NULL` if no delay is set.
`RDB$SQL_SECURITY`	`BOOLEAN`	The default `SQL SECURITY` mode (`DEFINER` or `INVOKER`) applied to newly created objects: `NULL` - initial default (`INVOKER`) `FALSE` - `INVOKER` `TRUE` - `DEFINER`

RDB$DESCRIPTION

BLOB TEXT

Database comment text

RDB$RELATION_ID

SMALLINT

A number that steps up by one each time a table or view is added to the database

RDB$SECURITY_CLASS

CHAR(63)

The security class defined in RDB$SECURITY_CLASSES to apply access control limits common to the entire database

RDB$CHARACTER_SET_NAME

CHAR(63)

The name of the default character set for the database set in the DEFAULT CHARACTER SET clause when the database is created.NULL for character set NONE.

RDB$LINGER

INTEGER

Number of seconds "delay" (established with the ALTER DATABASE SET LINGER statement) until the database file is closed after the last connection to this database is closed (in SuperServer).NULL if no delay is set.

RDB$SQL_SECURITY

BOOLEAN

The default SQL SECURITY mode (DEFINER or INVOKER) applied to newly created objects:

NULL - initial default (INVOKER)
FALSE - INVOKER
TRUE - DEFINER

`RDB$DB_CREATORS`

RDB$DB_CREATORS contains a list of users granted the CREATE DATABASE privilege when using the specified database as a security database.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$USER`	`CHAR(63)`	User or role name
`RDB$USER_TYPE`	`SMALLINT`	Type of user `8` - user `13` - role

RDB$USER

CHAR(63)

User or role name

RDB$USER_TYPE

SMALLINT

Type of user

8 - user
13 - role

`RDB$DEPENDENCIES`

RDB$DEPENDENCIES stores the dependencies between database objects.

Column Name Data Type Description

Column Name	Data Type	Description
`RDB$DEPENDENT_NAME`	`CHAR(63)`	The name of the view, procedure, trigger, `CHECK` constraint or computed column the dependency is defined for, i.e., the dependent object
`RDB$DEPENDED_ON_NAME`	`CHAR(63)`	The name of the object that the defined object — the table, view, procedure, trigger, `CHECK` constraint or computed column — depends on
`RDB$FIELD_NAME`	`CHAR(63)`	The column name in the depended-on object that is referred to by the dependent view, procedure, trigger, `CHECK` constraint or computed column
`RDB$DEPENDENT_TYPE`	`SMALLINT`	Identifies the type of the dependent object: `0` - table `1` - view `2` - trigger `3` - computed column `4` - `CHECK` constraint `5` - procedure `6` - index expression `7` - exception `8` - user `9` - column `10` - index `15` - stored function `18` - package header `19` - package body
`RDB$DEPENDED_ON_TYPE`	`SMALLINT`	Identifies the type of the object depended on: `0` - table (or a column in it) `1` - view `2` - trigger `3` - computed column `4` - `CHECK` constraint `5` - procedure (or its parameter(s)) `6` - index expression `7` - exception `8` - user `9` - column `10` - index `14` - generator (sequence) `15` - UDF or stored function `17` - collation`18` - package header `19` - package body
`RDB$PACKAGE_NAME`	`CHAR(63)`	The package of a procedure or function for which this describes the dependency.

RDB$DEPENDENT_NAME

CHAR(63)

The name of the view, procedure, trigger, CHECK constraint or computed column the dependency is defined for, i.e., the dependent object

RDB$DEPENDED_ON_NAME

CHAR(63)

The name of the object that the defined object — the table, view, procedure, trigger, CHECK constraint or computed column — depends on

RDB$FIELD_NAME

CHAR(63)

The column name in the depended-on object that is referred to by the dependent view, procedure, trigger, CHECK constraint or computed column

RDB$DEPENDENT_TYPE

SMALLINT

Identifies the type of the dependent object:

0 - table
1 - view
2 - trigger
3 - computed column
4 - CHECK constraint
5 - procedure
6 - index expression
7 - exception
8 - user
9 - column
10 - index
15 - stored function
18 - package header
19 - package body

RDB$DEPENDED_ON_TYPE

SMALLINT

Identifies the type of the object depended on:

0 - table (or a column in it)
1 - view
2 - trigger
3 - computed column
4 - CHECK constraint
5 - procedure (or its parameter(s))
6 - index expression
7 - exception
8 - user
9 - column
10 - index
14 - generator (sequence)
15 - UDF or stored function
17 - collation18 - package header
19 - package body

RDB$PACKAGE_NAME

CHAR(63)

The package of a procedure or function for which this describes the dependency.

RDB$BACKUP_HISTORY

RDB$BACKUP_HISTORY

RDB$INDICES

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RDB$KEYWORDS

RDB$LOG_FILES

RDB$PACKAGES

RDB$PAGES

RDB$PROCEDURES

RDB$PROCEDURE_PARAMETERS

RDB$PUBLICATIONS

RDB$PUBLICATION_TABLES

RDB$REF_CONSTRAINTS

RDB$CHARACTER_SETS

RDB$RELATIONS

RDB$RELATION_CONSTRAINTS

RDB$RELATION_FIELDS

RDB$ROLES

RDB$SECURITY_CLASSES

RDB$TIME_ZONES

RDB$TRANSACTIONS

RDB$TRIGGERS

RDB$TRIGGER_TYPE Value

RDB$TRIGGER_MESSAGES

RDB$TYPES

RDB$CHECK_CONSTRAINTS

RDB$USER_PRIVILEGES

RDB$VIEW_RELATIONS

RDB$COLLATIONS

RDB$CONFIG

RDB$DATABASE

RDB$DB_CREATORS

RDB$DEPENDENCIES

`RDB$BACKUP_HISTORY`

`RDB$INDICES`

`RDB$KEYWORDS`

`RDB$LOG_FILES`

`RDB$PACKAGES`

`RDB$PAGES`

`RDB$PROCEDURES`

`RDB$PROCEDURE_PARAMETERS`

`RDB$PUBLICATIONS`

`RDB$PUBLICATION_TABLES`

`RDB$REF_CONSTRAINTS`

`RDB$CHARACTER_SETS`

`RDB$RELATIONS`

`RDB$RELATION_CONSTRAINTS`

`RDB$RELATION_FIELDS`

`RDB$ROLES`

`RDB$SECURITY_CLASSES`

`RDB$TIME_ZONES`

`RDB$TRANSACTIONS`

`RDB$TRIGGERS`

`RDB$TRIGGER_TYPE` Value

`RDB$TRIGGER_MESSAGES`

`RDB$TYPES`

`RDB$CHECK_CONSTRAINTS`

`RDB$USER_PRIVILEGES`

`RDB$VIEW_RELATIONS`

`RDB$COLLATIONS`

`RDB$CONFIG`

`RDB$DATABASE`

`RDB$DB_CREATORS`

`RDB$DEPENDENCIES`