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

本站中文解释

DBA_HIST_COMP_IOSTAT视图是用来显示磁盘I/O组件的统计信息的。通过这个视图,可以查看当前运行操作系统的Disk I/O的统计信息。包括磁盘空间使用情况、I/O读写操作的速度快慢等等。这些信息可以帮助DBA了解Oracle数据库的性能状况,帮助DBA进行优化调整,提高数据库的运行性能。

使用这个视图,可以通过以下语句来使用:

SELECT * FROM DBA_HIST_COMP_IOSTAT;

这将显示当前运行操作系统的Disk I/O的统计信息。如果需要查看当前某个磁盘上的I/O统计信息,可以使用下面的语句:

SELECT * FROM DBA_HIST_COMP_IOSTAT WHERE DISK_NUMBER=20;

这将显示编号为”20″的磁盘上的I/O统计信息。

官方英文解释

DBA_HIST_COMP_IOSTAT displays information about I/O statistics aggregated on the component level.

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

COMPONENT

VARCHAR2(64)

NOT NULL

Component name

FILE_TYPE

VARCHAR2(64)

NOT NULL

File type

IO_TYPE

CHAR(5)

NOT NULL

The type of I/O performed

OPERATION

CHAR(5)

NOT NULL

Operation name

BYTES

NUMBER

NOT NULL

Number of bytes

IO_COUNT

NUMBER

NOT NULL

Number of I/Os that were performed

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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