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Oracle® Database Reference
12c Release 1 (12.1)

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V$CACHE_TRANSFER is identical to the V$CACHE view but only displays blocks that have been pinged at least once. This view contains information from the block header of each block in the SGA of the current instance as related to particular database objects. This is a Real Application Clusters view.

Column Datatype Description
FILE# NUMBER Data file identifier number (to find the file name, query DBA_DATA_FILES or V$DBFILE)
BLOCK# NUMBER Block number
CLASS# NUMBER Class number
STATUS VARCHAR2(10) Status of the block:
  • free - Not currently in use

  • xcur - Exclusive

  • scur - Shared current

  • cr - Consistent read

  • read - Being read from disk

  • mrec - In media recovery mode

  • irec - In instance recovery mode

XNC NUMBER Number of PCM lock conversions due to contention with another instance. This column is obsolete and maintained for backward compatibility.
FORCED_READS NUMBER Number of times the block had to be reread from the cache because another instance has forced it out of this instance's cache by requesting the lock on the block in exclusive mode
FORCED_WRITES NUMBER Number of times GCS had to write this block to cache because this instance had used the block and another instance had requested the lock on the block in a conflicting mode
NAME VARCHAR2(128) Name of the database object containing the block
PARTITION_NAME VARCHAR2(128) NULL for nonpartitioned objects
KIND VARCHAR2(15) Type of database object

See Also: Table 8-1

OWNER# NUMBER Owner number
LOCK_ELEMENT_ADDR RAW(4 | 8) Address of the lock element that contains the PCM lock that is covering the buffer. If more than one buffer has the same address, then these buffers are covered by the same PCM lock.
LOCK_ELEMENT_NAME NUMBER The name of the lock that contains the PCM lock that is covering the buffer
CON_ID NUMBER The ID of the container to which the data pertains. Possible values include:
  • 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs.

  • 1: This value is used for rows containing data that pertain to only the root

  • n: Where n is the applicable container ID for the rows containing data

See Also: