10.146 V$ZONEMAP_USAGE_STATS

V$ZONEMAP_USAGE_STATS displays zone map usage statistics.

Column Datatype Description

ZONEMAP

VARCHAR2(257)

Name of the zone map in the form of owner.name

PRUNING_TYPE

VARCHAR2(11)

Type of data pruning performed using the zone map

EXECUTIONS

NUMBER

Number of executions, including parallel worker executions

BASE_COUNT

NUMBER

Base count accumulated over number of executions

PRUNED_COUNT

NUMBER

Pruned count accumulated over number of executions

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

The ratio (PRUNED_COUNT / BASE_COUNT) shows the fraction of data pruned by the zone map.