Oracle教程 2023-02-25

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

本站中文解释

DBA_HIST_IOSTAT_FILETYPE视图是Oracle数据库中提供的动态性能视图，属于Oracle性能分析的一部分。

DBA_HIST_IOSTAT_FILETYPE视图从V$BH视图中查询出每个数据文件的当前IO读/写状态。它返回数据库文件的性能摘要，包括数据文件名称、空间使用情况、磁盘I/O状态等信息。

可以使用该视图查看每个数据文件的I/O读/写情况，以及哪些数据文件的磁盘I/O最忙。这有助于数据库管理员识别瓶颈并进行优化，提高数据库I/0性能。

可以使用DBA_HIST_IOSTAT_FILETYPE视图来查看要分析的数据文件的I/O读/写状态，以及数据文件的名称，磁盘I/O状态等信息。例如，要查看V$BH视图中特定文件的I/O读/写状态，可以使用如下语句：

select * from dba_hist_iostat_filetype where file_name = ”;

官方英文解释

DBA_HIST_IOSTAT_FILETYPE displays historical I/O statistics by file type.

This view contains snapshots of V$IOSTAT_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
`FILETYPE_ID`	`NUMBER`	`NOT NULL`	Type of file (for example, log file, data file, and so on)
`FILETYPE_NAME`	`VARCHAR2(30)`	`NOT NULL`	Name of the file, in the case of a data file or temp file. For all other files, a corresponding string to be displayed (for example, `ARCHIVELOG`).
`SMALL_READ_MEGABYTES`	`NUMBER`	`NOT NULL`	Number of single block megabytes read
`SMALL_WRITE_MEGABYTES`	`NUMBER`	`NOT NULL`	Number of single block megabytes written
`LARGE_READ_MEGABYTES`	`NUMBER`	`NOT NULL`	Number of multiblock megabytes read
`LARGE_WRITE_MEGABYTES`	`NUMBER`	`NOT NULL`	Number of multiblock megabytes written
`SMALL_READ_REQS`	`NUMBER`	`NOT NULL`	Number of single block read requests
`SMALL_WRITE_REQS`	`NUMBER`	`NOT NULL`	Number of single block write requests
`SMALL_SYNC_READ_REQS`	`NUMBER`	`NOT NULL`	Number of synchronous single block read requests
`LARGE_READ_REQS`	`NUMBER`	`NOT NULL`	Number of multiblock read requests
`LARGE_WRITE_REQS`	`NUMBER`	`NOT NULL`	Number of multiblock write requests
`SMALL_READ_SERVICETIME`	`NUMBER`	`NOT NULL`	Total service time (in milliseconds) for single block read requests
`SMALL_WRITE_SERVICETIME`	`NUMBER`	`NOT NULL`	Total service time (in milliseconds) for single block write requests
`SMALL_SYNC_READ_LATENCY`	`NUMBER`	`NOT NULL`	Latency for single block synchronous reads (in milliseconds)
`LARGE_READ_SERVICETIME`	`NUMBER`	`NOT NULL`	Total service time (in milliseconds) for multiblock read requests
`LARGE_WRITE_SERVICETIME`	`NUMBER`	`NOT NULL`	Total service time (in milliseconds) for multiblock write requests
`RETRIES_ON_ERROR`	`NUMBER`	`NOT NULL`	Number of read retries on error
`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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