DBA_HIST_ROWCACHE_SUMMARY

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	NOT NULL	Unique snapshot ID
DBID	NUMBER	NOT NULL	Database ID for the snapshot
INSTANCE_NUMBER	NUMBER	NOT NULL	Instance number for the snapshot
PARAMETER	VARCHAR2(32)	NOT NULL	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
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

See Also: “V$ROWCACHE”