September 2014
Intermediate to advanced
384 pages
9h 28m
English
Content preview from Mastering MariaDBBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The performance_schema database
In the most relevant parts of MariaDB code, instrumentations can be found that allow detailed performance monitoring. The results of such monitoring are written into a special database called performance_schema. Since the monitoring activity sensibly slows down the server performance, it is possible to disable it in the configuration file, by setting the performance_schema variable to 0.
The performance_schema variable is based on the following concepts:
- Actors: An actor is a thread that is currently monitored. It can be a user connection or a background MariaDB thread.
- Consumers: Consumers are tables that are populated with performance data.
- Instruments: These are used in instrumented MariaDB activities such as knowing ...
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