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 |