Oracle教程 2023-02-24

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

_STAT

Oracle视图DBA_HIST_THREAD_STAT是一个动态性能视图，它用于查询数据库中每个线程的历史性能数据。该视图是从数据库中的Performance Views（V$THREAD_STAT）中收集的，可以提供有关当前活动线程的当前状态的动态信息。

使用该视图可以更轻松地识别性能瓶颈，优化每个线程的性能，并为Oracle管理员提供正确的报告和故障排除。

可以使用以下SQL语句来查询DBA_HIST_THREAD_STAT视图的数据:

SELECT * FROM DBA_HIST_THREAD_STAT;

DBA_HIST_THREAD displays historical thread information from the control file.

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
`THREAD#`	`NUMBER`	`NOT NULL`	Thread number
`THREAD_INSTANCE_NUMBER`	`NUMBER`		Instance number of the thread
`STATUS`	`VARCHAR2(6)`		Thread status (`OPEN`) or (`CLOSED`)
`OPEN_TIME`	`DATE`		Last time the thread was opened
`CURRENT_GROUP#`	`NUMBER`		Current log group
`SEQUENCE#`	`NUMBER`		Sequence number of the current log
`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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