## DATACACHE

### Definition

The system table DATACACHE describes the areas of the data cache.

### Structure

DATACACHE

USABLESIZE | FIXED(20) | Size of the data cache (KB)
USEDSIZE | FIXED(20) | Used area of the data cache (KB)
MAXUSEDSIZE | FIXED(20) | Maximum used area of the data cache (KB)
OMSDATASIZE | FIXED(20) | Size of the area of the data cache that is used for storing the OMS data (KB)
OMSUNLOADEDVERSIONSIZE | FIXED(20) | Size of the OMS versions that were displaced from the main memory for space reasons (KB)
HISTORYDATASIZE | FIXED(20) | Size of the area of the data cache that is required for consistent reads and transaction management (KB)
SQLDATASIZE | FIXED(20) | Size of the area of the data cache that is not required either for OMS or for consistent reads and transaction management (KB)
CHANGEDDATASIZE | FIXED(20) | Amount of changed data since the last savepoint that has to be written to data area at next savepoint (KB)
PENDINGOPERATIONCOUNT | FIXED(10) | Number of structure-changing operations that need to be included in the next savepoint