Tag - mutex

PMM’s Custom Queries in Action: Adding a Graph for InnoDB mutex waits

PMM mutex wait graph

One of the great things about Percona Monitoring and Management (PMM) is its flexibility. An example of that is how one can go beyond the exporters to collect data. One approach to achieve that is using textfile collectors, as explained in   1.15.0, PMM provides user the ability to take a SQL SELECT statement […]

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Getting mutex information from MySQL’s performance_schema

We have been using SHOW ENGINE INNODB MUTEX command for years. It shows us mutex and rw-lock information that could be useful during service troubleshooting in case of performance problems. As Morgan Tocker announced in his blog post the command will be removed from MySQL 5.7 and we have to use performance_schema to get […]

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InnoDB scalability issues due to tables without primary keys

Each day there is probably work done to improve performance of the InnoDB storage engine and remove bottlenecks and scalability issues. Hence there was another one I wanted to highlight:
Scalability issues due to tables without primary keys
This scalability issue is caused by the usage of tables without primary keys. This issue typically shows itself […]

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