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