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Oracle® Database Reference
11g Release 1 (11.1)

Part Number B28320-01
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DBA_HIST_ROWCACHE_SUMMARY displays historical summary statistics for data dictionary activity. This view contains snapshots of V$ROWCACHE.

Column Datatype NULL Description
SNAP_ID NUMBER   Unique snapshot ID
DBID NUMBER   Database ID for the snapshot
INSTANCE_NUMBER NUMBER   Instance number for the snapshot
PARAMETER VARCHAR2(32)   Name of the initialization parameter that determines the number of entries in the data dictionary cache
TOTAL_USAGE NUMBER   Sum of the total number of entries in the cache
USAGE NUMBER   Number of cache entries that contain valid data
GETS NUMBER   Total number of requests for information on the data object
GETMISSES NUMBER   Number of data requests resulting in cache misses
SCANS NUMBER   Number of scan requests
SCANMISSES NUMBER   Number of times a scan failed to find the data in the cache
SCANCOMPLETES NUMBER   For a list of subordinate entries, the number of times the list was scanned completely
MODIFICATIONS NUMBER   Number of inserts, updates, and deletions
FLUSHES NUMBER   Number of times flushed to disk
DLM_REQUESTS NUMBER   Number of DLM requests
DLM_CONFLICTS NUMBER   Number of DLM conflicts
DLM_RELEASES NUMBER   Number of DLM releases