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https://dev.mysql.com/doc/refman/8.0/en/mysql-server-side-help.html
The proper operation of this command requires that the help tables in the mysql database be initialized with help topic information (see Section 7.1.17, “Server-Side Help Support”). To make a more specific request, please type 'help <item>', ...
https://dev.mysql.com/doc/refman/8.0/en/mysqld-safe.html
mysqld_safe accepts options on the command line and in option files, as described in the following table. mysqld_safe is the recommended way to start a mysqld server on Unix. mysqld_safe adds some safety features such as restarting the server when ...
https://dev.mysql.com/doc/refman/8.0/en/mysqldump-sql-format.html
Without this option, mysqldump treats the first name as a database name and those following as table names. This section describes how to use mysqldump to create SQL-format dump files. For information about reloading such dump files, see Section ...
https://dev.mysql.com/doc/refman/8.0/en/not-enough-file-handles.html
To tell mysqld to keep open fewer files at a time, you can make the table cache smaller by reducing the value of the table_open_cache system variable (the default value is 64). This may not entirely prevent running out of file descriptors because in ... 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 ...
https://dev.mysql.com/doc/refman/8.0/en/online-ddl-parallel-thread-configuration.html
Parallel scan is not supported on tables defined with virtual columns. Parallel scan is not supported on tables defined with a full-text index. Parallel scan is not supported on tables defined with a spatial index. The maximum setting is 256, which ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-transaction-management.html
Alternatively, for transactions that consist only of a single SELECT statement, turning on AUTOCOMMIT helps InnoDB to recognize read-only transactions and optimize them. When rows are modified or deleted within a long-running transaction, other ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-build-configuration.html
If you install MySQL over a previous installation that was configured without the Performance Schema (or with an older version of the Performance Schema that has missing or out-of-date tables). One indication of this issue is the presence of ...It ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-status-monitoring.html
When the server cannot create a mutex instrument, these results occur: No row for the instrument is inserted into the setup_instruments table. However, the content of the tables in the performance_schema database misses events. For example, ...Names ...
https://dev.mysql.com/doc/refman/8.0/en/postinstallation.html
This section discusses tasks that you should perform after installing MySQL: If necessary, initialize the data directory and create the MySQL grant tables. Assign passwords to the initial root account in the grant tables, if that was not already ...
https://dev.mysql.com/doc/refman/8.0/en/regexp.html
For example, it can be specified as a string expression or table column. For example, the regular expression hello|world contains the | alternation operator and matches either the hello or world. mysql> SELECT REGEXP_LIKE('Bn', '^Ba?n'); -> 1 mysql> ...This section discusses the functions and operators available for regular expression matching and illustrates, with examples, some of the special characters and constructs that can be used for regular expression ...