DBA_HIST_SYSMETRIC_HISTORY externalizes all available history of the system metric values for the entire set of data kept in the database. This view contains snapshots of V$SYSMETRIC_HISTORY.
| 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 | 
| BEGIN_TIME | DATE | NOT NULL | Begin time of the interval | 
| END_TIME | DATE | NOT NULL | End time of the interval | 
| INTSIZE | NUMBER | NOT NULL | Interval size (in hundredths of a second) | 
| GROUP_ID | NUMBER | NOT NULL | Group ID | 
| METRIC_ID | NUMBER | NOT NULL | Metric ID | 
| METRIC_NAME | VARCHAR2(64) | NOT NULL | Metric name | 
| VALUE | NUMBER | NOT NULL | Metric Value | 
| METRIC_UNIT | VARCHAR2(64) | NOT NULL | Unit of measurement |