Oracle教程 2023-02-24

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

本站中文解释

_VIEW视图 Oracle DBA_HIST_IOSTAT_DETAIL_VIEW视图是用来存储每次实例重新启动之后，IO性能参数的历史信息。该视图包含SQL语句，像IOPS（每秒I/0操作数），数据传输量以及平均延迟等。

要使用DBA_HIST_IOSTAT_DETAIL_VIEW视图，首先必须在_io_stat_duration和_io_stat_delta初始化参数值上开启性能参数收集。然后可以使用如下查询，从DBA_HIST_IOSTAT_DETAIL_VIEW视图检索所需IO性能信息，如下：

SELECT *
FROM dba_hist_iostat_detail_view
WHERE snap_id BETWEEN &start_id AND &end_id;

上述查询将返回在指定时间（start_id和end_id之间）收集的IO性能指标和参数信息，例如IOPS，数据传输量，最大延迟等。这种查询特别有用，当用户正在监视数据库性能时，可以把IO性能参数记录到dba_hist_iostat_detail_view视图中。

官方英文解释

DBA_HIST_IOSTAT_DETAIL displays I/O statistics aggregated by combination of file type and function (component).

This view contains snapshots of V$IOSTAT_FILE and V$IOSTAT_FUNCTION.

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
`FUNCTION_ID`	`NUMBER`	`NOT NULL`	Function ID
`FUNCTION_NAME`	`VARCHAR2(30)`	`NOT NULL`	Function name
`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
`LARGE_READ_REQS`	`NUMBER`	`NOT NULL`	Number of multiblock read requests
`LARGE_WRITE_REQS`	`NUMBER`	`NOT NULL`	Number of multiblock write requests
`NUMBER_OF_WAITS`	`NUMBER`	`NOT NULL`	Number of I/O waits by functionality
`WAIT_TIME`	`NUMBER`	`NOT NULL`	Total wait time (in milliseconds)
`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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