DBA_HIST_SQL_WORKAREA_HSTGRM

DBA_HIST_SQL_WORKAREA_HSTGRM displays the historical cumulative work area execution statistics (cumulated since instance startup) for different work area groups.

This view contains snapshots of V$SQL_WORKAREA_HISTOGRAM.

Column	Datatype	NULL	Description
SNAP_ID	NUMBER	NOT NULL	Unique snapshot ID
DBID	NUMBER	NOT NULL	Database ID for the snapshot
INSTANCE_NUMBER	NUMBER	NOT NULL	Instance number for the snapshot
LOW_OPTIMAL_SIZE	NUMBER	NOT NULL	Lower bound for the optimal memory requirement of work areas included in the row (in bytes)
HIGH_OPTIMAL_SIZE	NUMBER	NOT NULL	Upper bound for the optimal memory requirement of work areas included in the row (in bytes)
OPTIMAL_EXECUTIONS	NUMBER		Number of work areas with an optimal memory requirement comprised between LOW_OPTIMAL_SIZE and HIGH_OPTIMAL_SIZE which have been executed in optimal mode since instance startup
ONEPASS_EXECUTIONS	NUMBER		Number of work areas with an optimal memory requirement comprised between LOW_OPTIMAL_SIZE and HIGH_OPTIMAL_SIZE which have been executed in one-pass mode since instance startup
MULTIPASSES_EXECUTIONS	NUMBER		Number of work areas with an optimal memory requirement comprised between LOW_OPTIMAL_SIZE and HIGH_OPTIMAL_SIZE which have been executed in multi-pass mode since instance startup
TOTAL_EXECUTIONS	NUMBER		Sum of OPTIMAL_EXECUTIONS, ONEPASS_EXECUTIONS, and MULTIPASSES_EXECUTIONS
CON_DBID	NUMBER		The database ID of the PDB for the sampled session
CON_ID	NUMBER		The ID of the container that CON_DBID identifies. Possible values include: 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs. 1: This value is used for rows containing data that pertain to only the root n: Where n is the applicable container ID for the rows containing data

See Also: “V$SQL_WORKAREA_HISTOGRAM”