## COMMANDCACHESTATISTICS

### Definition

The system table COMMANDCACHESTATISTICS contains the statistical information collected about the command cache activities since the last time the database instance was started. The command cache contains the SQL statements and their execution plans shared by different database sessions (the following refers to the SQL statement and execution plan collectively as a command).

### Structure

COMMANDCACHESTATISTICS

| FIXED(10) | Size of the command cache (KB)
USEDSIZE | FIXED(10) | Size of the area of the command cache that is actually used (KB)
USEDSIZEPERCENTAGE | FIXED(3) | Size of the area of the command cache that is actually used (%)
MAXUSEDSIZE | FIXED(10) | Maximum used area of the command cache (KB)
MAXUSEDSIZEPERCENTAGE | FIXED(3) | Maximum used area of the command cache (%)
COMMANDCOUNT | FIXED(10) | Number of stored commands
MAXCOMMANDCOUNT | FIXED(10) | Maximum number of stored commands
INSERTCOMMANDCOUNT | FIXED(10) | Number of inserts
DELETECOMMANDCOUNT | FIXED(10) | Number of deletes
FAILEDALLOCATECOUNT | FIXED(10) | Number of memory requests not fulfilled
CLEANUPCOUNT | FIXED(10) | Number of operations that encountered a lack of space in the main memory
CLEANUPCOMMANDCOUNT | FIXED(10) | Number of commands modified due to lack of space in the main memory
INVALIDATECOUNT | FIXED(10) | Number of data definition statements that made execution plans invalid
CURRENTUNLOADSTATEMENTCOUNT | FIXED(10) | Number of SQL statements currently displaced to disk
UNLOADSTATEMENTCOUNT | FIXED(10) | Number of SQL statements displaced to disk
RELOADSTATEMENTCOUNT | FIXED(10) | Number of SQL statements reloaded to the main memory
DELETEPLANCOUNT | FIXED(10) | Number of execution plans deleted due to lack of space in the main memory
HASHTABLESLOTCOUNT | FIXED(5) | Number of slots in the hash table
USEDHASHTABLESLOTCOUNT | FIXED(5) | Number of used slots in the hash table
MAXUSEDHASHTABLESLOTCOUNT | FIXED(5) | Maximum number of used slots in the hash table
AVGHASHTABLECHAINENTRYCOUNT | FIXED(5) | Average length of the hash entry overflow chains
MAXHASHTABLECHAINENTRYCOUNT | FIXED(5) | Maximum length of the hash entry overflow chains

See also:

COMMANDCACHESTATISTICSRESET