#MYSQL TUNING ONLINE CODE#

We do not see Performance Schema instrumentation as every other line of MySQL code, yet, and even less so it applied to 3rd party plugins and technologies, like Galera. It turned out that application level instrumentation of database servers in MySQL ecosystem is not detailed and dynamic enough for some complex cases. It summarizes the experience from my recent years of practical non-trivial performance problems solving for MariaDB and MySQL systems in production. One of the ways to present and study stack samples collected by perf or bpftrace, Flame Graphs, is also presented with examples coming from my experince as a support engineer.

Basic usage of, bcc tools and bpftrace, as well as main bpftrace features and commands are demonstrated. On Linux 4.9+ eBPF is probably the most powerful and least intrusive way to study performance problems. Basic usage steps are presented and several typical real life use cases (including adding dynamic probes to almost any line of MariaDB code) are discussed. Specifically, perf profiler and ftrace interface can be easily used while studying MariaDB performance problems. This is when perf profiler and, on recent Linux kernels (4.9+) eBPF and bpftrace tools come handy.

#MYSQL TUNING ONLINE CODE#

But it comes with a cost, requires careful sizing of performance counters, and the process of instrumenting the code is not yet complete even for MySQL 8, to say nothing about MariaDB with its 3rd party storage engines, plugins and libraries like Galera. Performance_schema introduced in MySQL 5.5 (and inherited from MySQL 5.6 by MariaDB) is supposed to provide detailed enough instrumentation for most cases. The process of investigation should have as small influence as possible on the server we try to troubleshoot. While troubleshooting MariaDB server performance problems it is important to find out where the time is spent in the mysqld process, on-CPU and off-CPU. Percona Live Online Agenda Slot (CORRECTED): Wed 20 May

Mysql tuning online