SNAPSHOT
SNAPSHOT records the start and end time of each performance view snapshot creation. After enable_wdr_snapshot is set to on, this catalog is created and maintained by the background snapshot thread. It is accessible only to users with system administrator rights.
 
   - This system catalog's schema is dbms_om.
 - Do not modify or delete this catalog externally. Otherwise, functions related to view snapshots may not work properly.
 
| 
        Column  | 
      
        Type  | 
      
        Description  | 
     
|---|---|---|
| 
        snapshot_id  | 
      
        Name  | 
      
        Snapshot ID. This column is the primary key and distribution key.  | 
     
| 
        start_ts  | 
      
        Timestamp with time zone  | 
      
        Snapshot start time.  | 
     
| 
        end_ts  | 
      
        Timestamp with time zone  | 
      
        Snapshot end time.  | 
     
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