Denser Compression Of Records

Dmitry Yemanov

Tracker ticket: #4723

Starting with ODS 13.1, the engine uses an advanced RLE compression method (with variable-length counter) that stores repeating byte sequences more effectively, thus reducing the storage overhead.This improves compression for long VARCHAR fields (especially UTF8 encoded) that are filled only partially.

Adriano dos Santos Fernandes

Tracker ticket: #7144

The engine now maintains a per-attachment cache of compiled SQL statements.By default, caching is enabled, the caching threshold is defined by the MaxStatementCacheSize parameter in firebird.conf.It can be disabled by setting MaxStatementCacheSize to zero.

The cache is maintained automatically;cached statements are invalidated when required (usually when some DDL statement is executed).