DBA_HIST_IM_SEG_STAT

DBA_HIST_IM_SEG_STAT displays information about historical in-memory segment statistics.

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
TS#	NUMBER	NOT NULL	Tablespace number
OBJ#	NUMBER	NOT NULL	Dictionary object number
DATAOBJ#	NUMBER	NOT NULL	Data object number
MEMBYTES	NUMBER		Size of in-memory version of the segment in bytes
SCANS	NUMBER		Count of segment statistics
SCANS_DELTA	NUMBER		Delta values for in-memory scans
DB_BLOCK_CHANGES	NUMBER		The total number of changes that were part of an update or delete operation that were made to segment blocks
DB_BLOCK_CHANGES_DELTA	NUMBER		Delta value for database block changes
POPULATE_CUS	NUMBER		Count of compression units (CUs) populated per segment
POPULATE_CUS_DELTA	NUMBER		Delta value for compression unit (CU) populate operations
REPOPULATE_CUS	NUMBER		Count of CUs repopulated per segment
REPOPULATE_CUS_DELTA	NUMBER		Delta value for compression unit (CU) repopulate operations
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