Oracle9i Database Reference
Release 1 (9.0.1)

Part Number A90190-02
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Dynamic Performance (V$) Views, 122 of 211


V$PING

This is an Oracle9i Real Application Clusters view. The V$PING view is identical to the V$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.

See Also:

"V$CACHE" and Oracle9i Real Application Clusters Concepts 

Column  Datatype  Description 

FILE# 

NUMBER 

Datafile identifier number (to find filename, query "DBA_DATA_FILES" or "V$DBFILE"

BLOCK# 

NUMBER 

Block number 

CLASS# 

NUMBER 

Class number 

STATUS 

VARCHAR2(4) 

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 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 This column is obsolete but is retained for historical compatibility.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(30) 

NULL for non-partitioned objects 

KIND 

VARCHAR2(15) 

Type of database object

See Also: Table 3-1 

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 


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