V$CACHE_LOCK

V$CACHE_LOCK is deprecated. The information that was provided in this view is now provided in the V$INSTANCE_CACHE_TRANSFER and V$SEGMENT_STATISTICS views.

Column Datatype Description
FILE# NUMBER Datafile identifier number (to find filename, query DBA_DATA_FILES or V$DBFILE)
BLOCK# NUMBER Block number
STATUS VARCHAR2(6) 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 parallel cache management (PCM) lock conversions due to contention with another instance
NAME VARCHAR2(30) Name of the database object containing the block
KIND VARCHAR2(12) Type of database object:

  • 1 - Index

  • 2 - Table

  • 3 - Cluster

  • 4 - View

  • 5 - Synonym

  • 6 - Sequence

  • 7 - Procedure

  • 8 - Function

  • 9 - Package

  • 10 - Nonexistent

  • 11 - Package body

  • 12 - Trigger

  • 13 - Type

  • 14 - Type body

  • 19 - Table partition

  • 20 - Index partition

  • 21 - LOB

  • 22 - Library

  • Null - Unknown
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 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.
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
INDX NUMBER Platform-specific lock manager identifier
CLASS NUMBER Platform-specific lock manager identifier