Oracle 视图 V$THREAD 官方解释，作用，如何使用详细说明

Oracle 视图V$THREAD表具有用于跟踪当前数据库实例的多种线程的功能，V$THREAD能够显示出现在每个线程中的每条SQL语句，其视图中的每个字段都记录每个连接的信息。它们可以被用来监控正在操作此数据库实例的连接、服务器进程、会话以及数据库工作线程的状态、活动以及进程等。

使用方法：

1.查看线程：使用SELECT 查看V$THREAD视图，可以查看当前正在操作此数据库实例的连接、服务器进程、会话以及数据库工作线程的状态、活动以及进程等。

2.查看进程：使用SELECT引用V$THREAD视图，查看每个进程的状态，包括来自用户会话的响应时间，以及此进程可用于其他用户操作的空闲时间和有效时间等。

3.查看服务器进程：使用SELECT查看V$THREAD视图，可以查看每个服务器进程所执行的SQL语句和最后一次执行的时间，以及工作的实际开始时间和结束时间等。

V$THREAD displays thread information from the control file. This view does not return meaningful results on a physical standby database.

Column	Datatype	Description
`THREAD#`	`NUMBER`	Thread number
`STATUS`	`VARCHAR2(6)`	Thread status (`OPEN`\| `CLOSED`)
`ENABLED`	`VARCHAR2(8)`	Enabled status: `DISABLED`, (enabled) `PRIVATE`, or (enabled) `PUBLIC`
`GROUPS`	`NUMBER`	Number of log groups assigned to this thread
`INSTANCE`	`VARCHAR2(80)`	Instance name, if available
`OPEN_TIME`	`DATE`	Last time the thread was opened
`CURRENT_GROUP#`	`NUMBER`	Current log group
`SEQUENCE#`	`NUMBER`	Sequence number of current log
`CHECKPOINT_CHANGE#`	`NUMBER`	SCN at last checkpoint
`CHECKPOINT_TIME`	`DATE`	Time of last checkpoint
`ENABLE_CHANGE#`	`NUMBER`	SCN at which thread was enabled
`ENABLE_TIME`	`DATE`	Time of enable SCN
`DISABLE_CHANGE#`	`NUMBER`	SCN at which thread was disabled
`DISABLE_TIME`	`DATE`	Time of disable SCN
`LAST_REDO_SEQUENCE#`	`NUMBER`	Last redo sequence number written by LGWR
`LAST_REDO_BLOCK`	`NUMBER`	Last redo block written by LGWR
`LAST_REDO_CHANGE#`	`NUMBER`	SCN of last redo for the thread
`LAST_REDO_TIME`	`DATE`	Time of last redo for the thread
`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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