1. Database Reference
  2. Dynamic Performance Views
  3. Dynamic Performance (V$) Views: V$ACCESS to V$HVMASTER_INFO
  4. V$CACHE_LOCK

7.123 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

Data file identifier number (to find file name, query DBA_DATA_FILES or V$DBFILE)

BLOCK#

NUMBER

Block 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 parallel cache management (PCM) lock conversions due to contention with another instance

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

KIND

VARCHAR2(15)

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.

INDX

NUMBER

Platform-specific lock manager identifier

CLASS

NUMBER

Platform-specific lock manager identifier

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