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https://dev.mysql.com/doc/refman/9.7/en/mysqld-server.html
The following discussion covers these MySQL server configuration topics: Startup options that the server supports. You can specify these options on the command line, through configuration files, or both. These variables reflect the current state and ...
https://dev.mysql.com/doc/refman/9.7/en/mysqldm.html
The diagnostics monitor mysqldm enables you to collect diagnostic data on your MySQL server. It runs a series of queries and generates JSON files containing the results of those queries. The number of iterations is configurable, as is the delay ...
https://dev.mysql.com/doc/refman/9.7/en/mysqlshow.html
The mysqlshow client can be used to quickly see which databases exist, their tables, or a table's columns or indexes. The same information can be obtained by using those statements directly. For example, you can issue them from the mysql client ...
https://dev.mysql.com/doc/refman/9.7/en/nested-join-optimization.html
The following discussion refers to the join syntax described in Section 15.2.13.2, “JOIN Clause”. The syntax of table_factor is extended in comparison with the SQL Standard. The latter accepts only table_reference, not a list of them inside a ...
https://dev.mysql.com/doc/refman/9.7/en/no-login-pluggable-authentication.html
The mysql_no_login server-side authentication plugin prevents all client connections to any account that uses it. Use cases for this plugin include: Accounts that must be able to execute stored programs and views with elevated privileges without ...
https://dev.mysql.com/doc/refman/9.7/en/no-matching-rows.html
If you have a complicated query that uses many tables but that returns no rows, you should use the following procedure to find out what is wrong: Test the query with EXPLAIN to check whether you can find something that is obviously wrong. Select ...
https://dev.mysql.com/doc/refman/9.7/en/not-enough-file-handles.html
If you get ERROR 'file_name' not found (errno: 23), Can't open file: file_name (errno: 24), or any other error with errno 23 or errno 24 from MySQL, it means that you have not allocated enough file descriptors for the MySQL server. You can either ...
https://dev.mysql.com/doc/refman/9.7/en/optimization-indexes.html
The best way to improve the performance of SELECT operations is to create indexes on one or more of the columns that are tested in the query. The index entries act like pointers to the table rows, allowing the query to quickly determine which rows ...
https://dev.mysql.com/doc/refman/9.7/en/optimization.html
This chapter explains how to optimize MySQL performance and provides examples. Depending on your job role (developer, DBA, or a combination of both), you might optimize at the level of individual SQL statements, entire applications, a single ...
https://dev.mysql.com/doc/refman/9.7/en/optimize-benchmarking.html
To measure performance, consider the following factors: Whether you are measuring the speed of a single operation on a quiet system, or how a set of operations (a “workload”) works over a period of time. With simple tests, you usually test how ...