Oracle教程 2023-03-31

Oracle 视图 DBA_HIST_CR_BLOCK_SERVER 官方解释，作用，如何使用详细说明

本站中文解释

Oracle视图是指一个可以以表格形式显示的查询结果集，它通常也被称为虚拟表，无需重新创建表或者定义数据，用户可以通过视图对同一个或多个表中的数据进行查询。

The DBA_HIST_CR_BLOCK_SERVER视图，主要查看被阻塞服务器的历史信息，可以用以下查询来使用它：

SELECT timestamp,server_name,blocks,fixed,failures
FROM dba_hist_cr_block_server;

这会显示时间戳，服务器名称，被阻塞的行数，已经解决的阻塞和失败的阻塞的数量。

官方英文解释

DBA_HIST_CR_BLOCK_SERVER displays historical statistics on the Global Cache Service processes (LMS) used in cache fusion.

This view contains snapshots of V$CR_BLOCK_SERVER.

Column	Datatype	NULL	Description
`SNAP_ID`	`NUMBER`	`NOT NULL`	Unique snapshot ID
`DBID`	`NUMBER`	`NOT NULL`	Database ID for the snapshot
`INSTANCE_NUMBER`	`NUMBER`	`NOT NULL`	Instance number for the snapshot
`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 blocks 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 `DATA_REQUESTS` + `UNDO_REQUESTS` + `TX_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
`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
`FLUSHES`	`NUMBER`		Number of times the log has been flushed by an LMS process
`FLUSHES`	`NUMBER`		Number of times the log has been flushed by an LMS process
`BUILDS`	`NUMBER`		Number of requests for which the server had to fabricate a CR block
`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_DBID`	`NUMBER`		The database ID of the PDB for the sampled session
`CON_ID`	`NUMBER`		The ID of the container that `CON_DBID` identifies. 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

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官方英文解释

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