DBA_HIST_SGA_TARGET_ADVICE

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