SYSTEM_CACHES Catalog Table

The SYSTEM_CACHES catalog table stores the definitions of the caches created on remote tables. The data in the SYSTEM_CACHES table provides the name, type (single table or relational), status, and other information for each defined cache. The table name returned for a remote relational cache is the name of the primary table of the relational cache; however, its type is REMOTE RELATIONAL. You can query SYSTEM_CACHES to determine the caches currently defined by the driver. The values in the SYSTEM_CACHES table are read-only. The referenced tables of a relational cache can be determined by querying the SYSTEM_CACHE_REFERENCES catalog table (see SYSTEM_CACHE_REFERENCES Catalog Table).

Table 8. SYSTEM_CACHES Catalog Table
Column Name	Data Type	Description
TABLE_CAT	VARCHAR (128),NULLABLE	The catalog that contains the remote table on which the cache is defined. It is NULL for this driver.
TABLE_SCHEM	VARCHAR (128),NULLABLE	The schema that contains the remote table on which the cache is defined.
TABLE_NAME	VARCHAR (128),NOT NULL	The name of the remote table on which the cache is defined.
CACHE_TYPE	VARCHAR (20),NOT NULL	The type cache, which can be either REMOTE TABLE or REMOTE RELATIONAL.
REFRESH_INTERVAL	INTEGER,NOT NULL	The refresh interval (in minutes).
INITIAL_CHECK	VARCHAR (20),NOT NULL	The value that defines when the initial refresh check is performed: ONFIRSTCONNECT or FIRSTUSE.
PERSIST	VARCHAR (20),NOT NULL	The value that defines whether the data in the cache is persisted past the lifetime of the connection: TEMPORARY, MEMORY, or DISK.
ENABLED	BOOLEAN,NOT NULL	The value that defines whether the cache is enabled for use with SQL statements: TRUE or FALSE.
CALL_LIMIT	INTEGER,NOT NULL	The maximum number of Web service calls that can be made when refreshing the cache. The value 0 indicates no call limit.
REFRESH_MODE	INTEGER,NOT NULL	For internal use only.
FILTER	VARCHAR (128),NULLABLE	The Where clause used to filter the rows that are cached.
LAST_REFRESH	DATETIME, NULLABLE	The time, in Coordinated Universal Time (UTC), the cache was last refreshed.
STATUS	VARCHAR (30)	The Cache status. Valid values are: New: The cache has been created, but the data has not been populated. Initialized: The cache has been created and the data has been populated. Load aborted: The cache has been created, but the last attempt to populate the data failed. The cache is still valid. The next access attempts to populate the data again. Invalid: The cache is invalid. The second attempt to populate the data failed. Dirty: An insert or update operation has been performed on the cache and the cache has not been refreshed.