Oracle 视图 V$CR_BLOCK_SERVER 官方解释，作用，如何使用详细说明

CR_REQUESTS

NUMBER

Number of CR blocks served due to remote CR block requests

CURRENT_REQUESTS

NUMBER

Number of current blocks served due to remote CR block requests

CR_REQUESTS + CURRENT_REQUESTS = global cache CR clocks served (from V$SYSSTAT).

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

OTHER_REQUESTS

NUMBER

Number of CR requests for other types of blocks

DATA_REQUESTS + UNDO_REQUESTS + TX_REQUESTS + OTHER_REQUESTS = total number of requests handled by the LMS 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

STALE

NUMBER

Number of requests for which the disk read of the requested block was stale

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 an LMS process

FLUSHES_QUEUED

NUMBER

Number of flushes queued by an LMS process

FLUSH_QUEUE_FULL

NUMBER

Number of times the flush queue was full

FLUSH_MAX_TIME

NUMBER

Maximum time for flush

LIGHT_WORKS

NUMBER

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

ERRORS

NUMBER

Number of times an error was signalled by an LMS process

CON_ID

NUMBER

The ID of the container to which the data pertains. Possible values include:

• 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs.

• 1: This value is used for rows containing data that pertain to only the root

• n: Where n is the applicable container ID for the rows containing data