Oracle 视图 V$SESSION_WAIT_CLASS 官方解释，作用，如何使用详细说明
本站中文解释
V$SESSION_WAIT_CLASS是Oracle视图。它的作用是记录每个会话的当前等待事件的等待类别。
它使用它记录等待类别和等待时间，并且可以用来查找系统中可能存在哪些等待事件。可以通过查看V$SESSION_WAIT_CLASS来评估系统性能。
要使用V$SESSION_WAIT_CLASS，你可以使用如下SQL查询它们：
SELECT sid, event#, wait_class, time_waited
FROM V$SESSION_WAIT_CLASS
WHERE sid IN (SELECT sid
FROM V$SESSION
WHERE username = ‘&user_name’);
上面的SQL语句将返回特定用户的会话空闲等待类别和等待时间。
官方英文解释
V$SESSION_WAIT_CLASS displays the time spent in various wait event operations on a per-session basis.
| Column | Datatype | Description |
|---|---|---|
|
|
|
Session identifier |
|
|
|
Serial number |
|
|
|
Identifier of the wait class |
|
|
|
Number of the wait class |
|
|
|
Name of the wait class |
|
|
|
Total number waits from this wait class by the session |
|
|
|
Total amount of time spent in waits from this wait class by the session (in hundredths of a second) |
|
|
|
Total amount of time spent in waits from this wait class by the session (in microseconds) |
|
|
|
Total amount of CPU time consumed by the session while implementing waits from this wait class (in microseconds) |
|
|
|
The ID of the container to which the data pertains. Possible values include:
|
