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Oracle® Database Reference
10g Release 1 (10.1)

Part Number B10755-01
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This is a Real Application Clusters view. Use this view to find the locks that protect multiple buffers, each of which has been either force-written or force-read at least 10 times. It is very likely that those buffers are experiencing false pings due to being mapped to the same lock.

Column Datatype Description
GC_ELEMENT_ADDR RAW(4 | 8) Address of the lock element that contains the PCM lock covering the buffer. If more than one buffer has the same address, then these buffers are covered by the same PCM lock.