DBA_HIST_SGA_TARGET_ADVICE provides historical information about the SGA_TARGET initialization parameter.
| 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 |
SGA_SIZE |
NUMBER |
NOT NULL |
Size of the SGA |
SGA_SIZE_FACTOR |
NUMBER |
NOT NULL |
Ratio between the SGA_SIZE and the current size of the SGA |
ESTD_DB_TIME |
NUMBER |
NOT NULL |
Estimated DB_TIME for this SGA_SIZE |
ESTD_PHYSICAL_READS |
NUMBER |
Estimated number of physical reads |