Oracle教程 2023-04-03

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

V$MUTEX_SLEEP（睡眠）视图显示了所有等待睡眠的调用者，它们被阻塞等待SQL一致性读。该视图返回子程序的睡眠状态，会话ID，请求ID，被保持锁的ID，被请求的模式，还有活动睡眠的时长。

使用方法:

可以使用以下查询语句查看V$MUTEX_SLEEP视图：

SELECT * FROM V$MUTEX_SLEEP;

这可以用于检查Oracle数据库请求是否被阻塞，以及是否有请求因等待一致性读而被阻塞。

V$MUTEX_SLEEP shows the wait time, and the number of sleeps for each combination of mutex type and location.

Column	Datatype	Description
`MUTEX_TYPE`	`VARCHAR2(32)`	Type of action/object the mutex protects
`LOCATION`	`VARCHAR2(40)`	The code location where the waiter slept for the mutex
`SLEEPS`	`NUMBER`	Number of sleeps for this `MUTEX_TYPE` and `LOCATION`
`WAIT_TIME`	`NUMBER`	Wait time in microseconds
`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

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