The Ultimate Guide to High Availability with MariaDB

host_summary_by_stages and x$host_summary_by_stages Sys Schema Views

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MariaDB starting with 10.6

These Sys Schema views were introduced in MariaDB 10.6.

Description

The host_summary_by_stages and x$host_summary_by_stages views summarize statement stages, grouped by host. Rows are sorted by host and descending total latency by default. The host_summary_by_stages view is intended to be easier for human reading, while the x$host_summary_by_stages 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).
event_nameStage event name.
totalTotal number of occurrences of the file stage event for the host.
total_latencyTotal wait time of timed occurrences of the stage event for the host.
avg_latencyAverage wait time per timed occurrence of the stage event for the host.

Example

SELECT * FROM sys.host_summary_by_stages\G
*************************** 1. row ***************************
         host: background
   event_name: stage/innodb/buffer pool load
        total: 1
total_latency: 3.75 ms
  avg_latency: 3.75 ms

SELECT * FROM sys.x$host_summary_by_stages\G
*************************** 1. row ***************************
         host: background
   event_name: stage/innodb/buffer pool load
        total: 1
total_latency: 3747098000
  avg_latency: 3747098000

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