Oracle教程 2023-02-25

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

Oracle 视图 DBA_HIST_FILEMETRIC_HISTORY 用于查询和测量仪表盘文件的历史度量标准。它提供对历史文件特定度量按时间顺序排序的快速访问。

使用 DBA_HIST_FILEMETRIC_HISTORY 视图时，需要指定 PASSWORD_VERSIONS、PRODUCT_ID 或 FILE_TYPE 来限制 SQL查询的范围，以获取相应的度量值。例如，要查询所有 TM_XML 文件的所有度量标准的历史值，可以运行以下 SQL 语句:

SELECT *
FROM DBA_HIST_FILEMETRIC_HISTORY
WHERE PASSWORD_VERSION = ‘TM_XML’
ORDER BY TIMESTAMP;

DBA_HIST_FILEMETRIC_HISTORY displays the history of file metrics collected in the Workload Repository.

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
`FILEID`	`NUMBER`	`NOT NULL`	File number
`CREATIONTIME`	`NUMBER`	`NOT NULL`	File creation time
`BEGIN_TIME`	`DATE`	`NOT NULL`	Begin time of the interval
`END_TIME`	`DATE`	`NOT NULL`	End time of the interval
`INTSIZE`	`NUMBER`	`NOT NULL`	Interval size (in hundredths of a second)
`GROUP_ID`	`NUMBER`	`NOT NULL`	ID of the group to which the file belongs
`AVGREADTIME`	`NUMBER`	`NOT NULL`	Average file read time
`AVGWRITETIME`	`NUMBER`	`NOT NULL`	Average file write time
`PHYSICALREAD`	`NUMBER`	`NOT NULL`	Number of physical reads
`PHYSICALWRITE`	`NUMBER`	`NOT NULL`	Number of physical writes
`PHYBLKREAD`	`NUMBER`	`NOT NULL`	Number of physical block reads
`PHYBLKWRITE`	`NUMBER`	`NOT NULL`	Number of physical block writes
`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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