| SNAP_ID | NUMBER |  | Unique snapshot ID | 
| DBID | NUMBER |  | Database ID for the snapshot | 
| INSTANCE_NUMBER | NUMBER |  | Instance number for the snapshot | 
| PARAMETER | VARCHAR2(32) |  | Name of the initialization parameter that determines the number of entries in the data dictionary cache | 
| TOTAL_USAGE | NUMBER |  | Sum of the total number of entries in the cache | 
| USAGE | NUMBER |  | Number of cache entries that contain valid data | 
| GETS | NUMBER |  | Total number of requests for information on the data object | 
| GETMISSES | NUMBER |  | Number of data requests resulting in cache misses | 
| SCANS | NUMBER |  | Number of scan requests | 
| SCANMISSES | NUMBER |  | Number of times a scan failed to find the data in the cache | 
| SCANCOMPLETES | NUMBER |  | For a list of subordinate entries, the number of times the list was scanned completely | 
| MODIFICATIONS | NUMBER |  | Number of inserts, updates, and deletions | 
| FLUSHES | NUMBER |  | Number of times flushed to disk | 
| DLM_REQUESTS | NUMBER |  | Number of DLM requests | 
| DLM_CONFLICTS | NUMBER |  | Number of DLM conflicts | 
| DLM_RELEASES | NUMBER |  | Number of DLM releases |