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Oracle® Database Reference
11g Release 2 (11.2)

E40402-14
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V$GC_ELEMENT

V$GC_ELEMENT displays one entry for each global cache resource that is used by the buffer cache. The name of the global cache resource that corresponds to a lock element is {'BL', indx, class}. This is a Real Application Clusters view.

Column Datatype Description
GC_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.
INDX NUMBER Platform specific lock manager identifier
CLASS NUMBER Platform specific lock manager identifier
GC_ELEMENT_NAME NUMBER Name of the lock that contains the PCM lock that is covering the buffer
MODE_HELD NUMBER Platform dependent value for lock mode held; often: 3 = share; 5 = exclusive
BLOCK_COUNT NUMBER Number of blocks covered by PCM lock
RELEASING NUMBER Nonzero if PCM lock is being downgraded
ACQUIRING NUMBER Nonzero if PCM lock is being upgraded
WRITING NUMBER If the GC_ELEMENT is being written, the write status
RECOVERING NUMBER If the GC_ELEMENT is being recovered, the recovery status
LOCAL NUMBER Zero if the GC_ELEMENT is local, one if it is global
FLAGS NUMBER Process level flags for the lock element