Dynamic Performance (V$) Views, 20 of 179

V$BSP

This view displays statistics on the block server background processes (BSPn) used in cache fusion.

Note:
This view contains internal diagnostic information for use by Oracle support personnel. It is subject to change without notice.

See Also:
Oracle8i Parallel Server Concepts for more information on these processes and on cache fusion.

Column	Datatype	Description
`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_LOCK_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.