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https://dev.mysql.com/doc/refman/5.7/en/create-index.html
For more information, see Section 13.1.18.8, “Secondary Indexes and Generated Columns”. For a unique index, an error occurs regardless of SQL mode because reducing the index length might enable insertion of nonunique entries that do not meet the ... CREATE [UNIQUE | FULLTEXT | SPATIAL] INDEX index_name [index_type] ON tbl_name (key_part,...) [index_option] [algorithm_option | lock_option] ...
https://dev.mysql.com/doc/refman/5.7/en/insert-optimization.html
You can use the following methods to speed up inserts: If you are inserting many rows from the same client at the same time, use INSERT statements with multiple VALUES lists to insert several rows at a time. This is considerably faster (many times ... To optimize insert speed, combine many small operations into a single large ...
https://dev.mysql.com/doc/refman/5.7/en/setting-environment-variables.html
For csh and tcsh, use setenv to make the shell variable available to the environment: setenv MYSQL_TCP_PORT 3306 The commands to set environment variables can be executed at your command prompt to take effect immediately, but the settings persist ...
https://dev.mysql.com/doc/refman/5.7/en/multiple-server-clients.html
If you normally use a specific socket file or port number, you can place commands to set these environment variables in your .login file so that they apply each time you log in. Start the client with --protocol=TCP to connect using TCP/IP, ...
https://dev.mysql.com/doc/refman/5.7/en/external-locking.html
If the server is run with external locking enabled, you can use myisamchk at any time for read operations such a checking tables. External locking affects server performance because the server must sometimes wait for other processes before it can ...
https://dev.mysql.com/doc/refman/5.7/en/history.html
We started out with the intention of using the mSQL database system to connect to our tables using our own fast low-level (ISAM) routines. However, after some testing, we came to the conclusion that mSQL was not fast enough or flexible enough for ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-sys-foreign-table.html
The INNODB_SYS_FOREIGN table provides metadata about InnoDB foreign keys, equivalent to the information from the SYS_FOREIGN table in the InnoDB data dictionary. For related usage information and examples, see Section 14.16.3, “InnoDB ...
https://dev.mysql.com/doc/refman/5.7/en/operator-precedence.html
Operator precedences are shown in the following list, from highest precedence to the lowest. Operators that are shown together on a line have the same precedence. When used as a comparison operator, it has the same precedence as <=>, >=, >, <=, <, ...
https://dev.mysql.com/doc/refman/5.7/en/stored-programs-defining.html
Each stored program contains a body that consists of an SQL statement. This statement may be a compound statement made up of several statements separated by semicolon (;) characters. For example, the following stored procedure has a body made up of ...
https://dev.mysql.com/doc/refman/5.7/en/json.html
A maximum of 3 JSON columns per NDB table is supported. MySQL parses any string used in a context that requires a JSON value, and produces an error if it is not valid as JSON. Positions for “at position N” in such error messages are 0-based, but ...The JSON data type provides these advantages over storing JSON-format strings in a string column: Automatic validation of JSON documents stored in JSON ...