Oracle 视图 V$KERNEL_IO_OUTLIER 官方解释，作用，如何使用详细说明
本站中文解释
Oracle视图V$KERNEL_IO_OUTLIER是一个动态视图，用于查看节点上存在IO I/O异常活动的操作。这个视图显示了节点上非常长的IO操作，这些操作可能导致性能问题。
该视图显示的列有：实例名称、用户会话ID、活动的实例操版本号和 SQL-ID、执行时间、 IO输出大小。
使用这个视图可以得到关于激活操作占用IO系统资源最多的信息，从而改善性能。 系统管理人员可以使用该视图识别DBA中潜在的可能存在性能问题的 IO操作，并进行相应的优化和管理。
官方英文解释
V$KERNEL_IO_OUTLIER contains entries corresponding to I/Os that have taken a long time (more than 500 ms) to complete.
Use this view to see the individual kernel components of I/Os for which there are any occasional delays in serving disk I/O requests by the storage subsystem.
Note:
Although this view exists on all platforms in Oracle Database 12c, it is only populated on the Solaris platform.
| Column | Datatype | Description |
|---|---|---|
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Number of seconds elapsed since 00:00 UTC, January 1, 1970 |
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Size of the I/O, in KB. |
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Offset into the device of the I/O |
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Name of the device to which the I/O was targeted |
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Name of the process that issued the I/O |
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Total time the I/O spent in the kernel (in milliseconds) |
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Time spent during initial I/O setup before sending to SCSI target device driver (in milliseconds) |
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Time spent in the SCSI target device driver before being sent to the Host Bus Adaptor (in milliseconds) |
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Time spent in the Host Bus Adaptor and physically transferring the I/O to the storage device (in milliseconds) |
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Time spent freeing resources used by the completed I/O (in milliseconds) |
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Process ID that issued the I/O |
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The ID of the container to which the data pertains. Possible values include:
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See Also:
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“V$IO_OUTLIER”
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“V$LGWRIO_OUTLIER”
