Skip Headers

Oracle® Database Reference
10g Release 1 (10.1)

Part Number B10755-01
Go to Documentation Home
Go to Book List
Book List
Go to Table of Contents
Go to Index
Go to Master Index
Master Index
Go to Feedback page

Go to previous page
Go to next page
View PDF


V$FALSE_PING is a Real Application Clusters 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.

Column Datatype Description
FILE# NUMBER Datafile identifier number (to find the 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 PCM lock conversions from Exclusive mode 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 This column is obsolete and maintained for backward compatibility.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(30) Name of the database object containing the block
PARTITION_NAME VARCHAR2(30) NULL for non-partitioned objects
KIND VARCHAR2(15) Type of database object
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 Name of the lock that contains the PCM lock that is covering the buffer