1. Database Reference
  2. Dynamic Performance Views
  3. Dynamic Performance (V$) Views: V$ACCESS to V$HVMASTER_INFO
  4. V$AW_CALC

7.79 V$AW_CALC

V$AW_CALC reports on the effectiveness of various caches used by Oracle OLAP during dynamic aggregation.

Column Datatype Description

SESSION_ID

NUMBER

A unique numeric identifier for the session.

AGGREGATE_CACHE_HITS

NUMBER

The number of times a dimension member is found in the aggregate cache (a hit).

The number of hits for run-time aggregation can be increased by fetching data across the dense dimension

AGGREGATE_CACHE_MISSES

NUMBER

The number of times a dimension member is not found in the aggregate cache and must be read from disk (a miss).

SESSION_CACHE_HITS

NUMBER

The number of times the data is found in the session cache (a hit).

SESSION_CACHE_MISSES

NUMBER

The number of times the data is not found in the session cache (a miss).

POOL_HITS

NUMBER

The number of times the data is found in a page in the OLAP page pool (a hit).

POOL_MISSES

NUMBER

The number of times the data is not found in the OLAP page pool (a miss).

POOL_NEW_PAGES

NUMBER

The number of newly created pages in the OLAP page pool that have not yet been written to the workspace LOB.

POOL_RECLAIMED_PAGES

NUMBER

The number of previously unused pages that have been recycled with new data.

CACHE_WRITES

NUMBER

The number of times the data from the OLAP page pool has been written to the database cache.

POOL_SIZE

NUMBER

The number of kilobytes in the OLAP page pool.

CURR_DML_COMMAND

VARCHAR2(64)

The command currently being executed.

PREV_DML_COMMAND

VARCHAR2(64)

The command most recently completed.

AGGR_FUNC_LOGICAL_NA

NUMBER

The number of times the aggregation engine returns a logical NA because the AGGINDEX option is on and the composite tuple does not exist.

AGGR_FUNC_PRECOMPUTE

NUMBER

The number of times the aggregation engine finds a value in a position that it was called to calculate.

AGGR_FUNC_CALCS

NUMBER

The number of times the aggregation engine calculates a parent value based on the values of its children.

CON_ID

NUMBER

The ID of the container to which the data pertains. 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