January 2019
Intermediate to advanced
286 pages
7h 41m
English
Content preview from Advanced MySQL 8
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The most important variables are full-scan indicators
The high season is coming for your business, and you wonder how you will manage the load on your MySQL database.
Stress tests can help you, but it's not a good idea to run them in a production environment. In this case, we can use two important variables that can come to your aid and are called Select_scan and Select_full_join. Of course, other MySQL counters could also give you an idea of the number of queries that will impact MySQL performance, which could lead to performance degradation as the load or pressure increases on your database.
The Select_scan variable in the MySQL SHOW GLOBAL STATUS report shows the number of full scans performed since the last MySQL restart (because every ...
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