host_summary_by_file_io and x$host_summary_by_file_io Sys Schema Views

You are viewing an old version of this article. View the current version here.
MariaDB starting with 10.6

This Sys Schema view was introduced in MariaDB 10.6

Description

The host_summary_by_file_io and x$host_summary_by_file_io views summarize file I/O, grouped by host. Rows are sorted by descending total file I/O latency by default.

The host_summary_by_file_io view is intended to be easier for human reading, while the and x$host_summary_by_file_io view provides the data in raw form, intended for tools that process the data.

They contain the following columns:

ColumnDescription
hostHost that the client connected from, or background for background threads (where the HOST column in the underlying Performance Schema table is NULL).
iosTotal file I/O events for the host.
ios_latencyTotal wait time of timed file I/O events for the host.

Example

SELECT * FROM sys.host_summary_by_file_io\G
*************************** 1. row ***************************
      host: localhost
       ios: 6526
io_latency: 490.28 ms
*************************** 2. row ***************************
      host: background
       ios: 457
io_latency: 151.39 ms

SELECT * FROM sys.x$host_summary_by_file_io\G
*************************** 1. row ***************************
      host: localhost
       ios: 6532
io_latency: 490447878974
*************************** 2. row ***************************
      host: background
       ios: 457
io_latency: 151388125856

Comments

Comments loading...
Content reproduced on this site is the property of its respective owners, and this content is not reviewed in advance by MariaDB. The views, information and opinions expressed by this content do not necessarily represent those of MariaDB or any other party.