CR_REQUESTS

NUMBER

Number of requests received for a version of a block at a specific SCN ("CR" refers to "consistent-read")

CURRENT_REQUESTS

NUMBER

Number of requests for the most recent (current) version of a block

CR_REQUESTS + CURRENT_REQUESTS = total number of requests handled by the BSPn processes

DATA_REQUESTS

NUMBER

Number of current or CR requests for data blocks

UNDO_REQUESTS

NUMBER

Number of CR requests for undo blocks

TX_REQUESTS

NUMBER

Number of CR requests for undo segment header blocks

DATA_REQUESTS + UNDO_REQUESTS + TX_REQUESTS = total number of requests handled by the BSPn processes

CURRENT_RESULTS

NUMBER

Number of requests for which no changes were rolled out of the block returned to the requesting instance

PRIVATE_RESULTS

NUMBER

Number of requests for which changes were rolled out of the block returned to the requesting instance, and only the requesting transaction can use the resulting CR block

ZERO_RESULTS

NUMBER

Number of requests for which changes were rolled out of the block returned to the requesting instance. Only zero-XID transactions can use the block.

DISK_READ_RESULTS

NUMBER

Number of requests for which the requesting instance had to read the requested block from disk

FAIL_RESULTS

NUMBER

Number of requests that failed; the requesting transaction must reissue the request

FAIRNESS_DOWN_CONVERTS

NUMBER

Number of times an instance receiving a request has down-converted an X lock on a block because it was not modifying the block

FAIRNESS_CLEARS

NUMBER

Number of times the "fairness counter" was cleared. This counter tracks the number of times a block was modified after it was served.

FREE_GC_ELEMENTS

NUMBER

Number of times a request was received from another instance and the X lock had no buffers

FLUSHES

NUMBER

Number of times the log has been flushed by a BSPn process

LIGHT_WORKS

NUMBER

Number of times the light-work rule was evoked. This rule prevents the BSP back ground process from going to disk while responding to CR requests for data, undo, or undo segment header blocks. This rule can prevent the BSP process from completing its response to the CR request.