Dynamic Performance (V$) Views, 55 of 179

V$FALSE_PING

V$FALSE_PING is an Oracle Parallel Server view. This view displays buffers that may be getting false pings. That is, buffers pinged more than 10 times that are protected by the same lock as another buffer that pinged more than 10 times. Buffers identified as getting false pings can be remapped in "GC_FILES_TO_LOCKS"to reduce lock collisions.

See Also:
"GC_FILES_TO_LOCKS" and Oracle8i Parallel Server Concepts.

Column Datatype Description

FILE#

NUMBER

Datafile identifier number (to find filename, query DBA_DATA_FILES or V$DBFILES)

BLOCK#

NUMBER

Block number

STATUS

VARCHAR2(1)

Status of 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 from Exclusive mode due to contention with another instance. This column is obsolete but is retained for historical compatibility

FORCED_READS

NUMBER

Number of times the block had to be reread from disk because another instance had forced it out of this instance's cache by requesting the PCM lock on the block in exclusive mode

FORCED_WRITES

NUMBER

Number of times DBWR had to write this block to disk because this instance had used the block and another instance had requested the lock on the block in a conflicting mode

NAME

VARCHAR2(30)

Name of the database object containing the block

PARTITION_NAME

VARCHAR2

NULL for non-partitioned objects

KIND

VARCHAR2(12)

Type of database object.

OWNER#

NUMBER

Owner number

LOCK_ELEMENT_ADDR

RAW(4)

The 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

LOCK_ELEMENT_CLASS

NUMBER

The lock element class

Column	Datatype	Description
`FILE#`	`NUMBER`	Datafile identifier number (to find filename, query DBA_DATA_FILES or V$DBFILES)
`BLOCK#`	`NUMBER`	Block number
`STATUS`	`VARCHAR2(1)`	Status of 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 from Exclusive mode due to contention with another instance. This column is obsolete but is retained for historical compatibility
`FORCED_READS`	`NUMBER`	Number of times the block had to be reread from disk because another instance had forced it out of this instance's cache by requesting the PCM lock on the block in exclusive mode
`FORCED_WRITES`	`NUMBER`	Number of times DBWR had to write this block to disk because this instance had used the block and another instance had requested the lock on the block in a conflicting mode
`NAME`	`VARCHAR2(30)`	Name of the database object containing the block
`PARTITION_NAME`	`VARCHAR2`	NULL for non-partitioned objects
`KIND`	`VARCHAR2(12)`	Type of database object.
`OWNER#`	`NUMBER`	Owner number
`LOCK_ELEMENT_ADDR`	`RAW(4)`	The 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
`LOCK_ELEMENT_CLASS`	`NUMBER`	The lock element class