| Oracle® Database Reference 10g Release 2 (10.2) Part Number B14237-02 | 
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DBA_HIST_SERVICE_WAIT_CLASS displays the history of wait class information for services as tracked by the Workload Repository. This view contains information from V$SERVICE_WAIT_CLASS.
| Column | Datatype | NULL | Description | 
|---|---|---|---|
| SNAP_ID | NUMBER | Unique snapshot ID | |
| DBID | NUMBER | Database ID for the snapshot | |
| INSTANCE_NUMBER | NUMBER | Instance number for the snapshot | |
| SERVICE_NAME_HASH | NUMBER | Hash of the service name | |
| SERVICE_NAME | VARCHAR2(64) | Name of the service | |
| WAIT_CLASS_ID | NUMBER | Identifier for the class of the wait event | |
| WAIT_CLASS | VARCHAR2(64) | Name for the class of the wait event | |
| TOTAL_WAITS | NUMBER | Total number of waits for this event | |
| TIME_WAITED | NUMBER | Total amount of time waited for this event (in hundredths of a second) |