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https://dev.mysql.com/doc/refman/5.7/en/sys-format-statement.html
This function is useful for formatting possibly lengthy statements retrieved from Performance Schema tables to a known fixed maximum length. Configuration Options format_statement() operation can be modified using the following configuration options ... Given a string (normally representing an SQL statement), reduces it to the length given by the statement_truncate_len configuration option, and returns the ...
https://dev.mysql.com/doc/refman/5.7/en/federated-create.html
The optimization occurs because the query sent to the remote server includes the contents of the WHERE clause, and is sent to the remote server and subsequently executed locally. To create a FEDERATED table you should follow these steps: Create the ...
https://dev.mysql.com/doc/refman/5.7/en/explain.html
In practice, the DESCRIBE keyword is more often used to obtain information about table structure, whereas EXPLAIN is used to obtain a query execution plan (that is, an explanation of how MySQL would execute a query). Obtaining Execution Plan ...The ...
https://dev.mysql.com/doc/refman/5.7/en/audit-log-disabling.html
The audit_log_disable variable can be set in a MySQL Server option file, in a command-line startup string, or at runtime using a SET statement; for example: SET GLOBAL audit_log_disable = true; Setting audit_log_disable to true disables the audit ...
https://dev.mysql.com/doc/refman/5.7/en/cannot-roll-back.html
In general, these include data definition language (DDL) statements, such as those that create or drop databases, those that create, drop, or alter tables or stored routines. If you issue a statement early in a transaction that cannot be rolled ...
https://dev.mysql.com/doc/refman/5.7/en/group-replication-fine-tuning-the-group-communication-thread.html
The group communication thread (GCT) runs in a loop while the Group Replication plugin is loaded. The GCT receives messages from the group and from the plugin, handles quorum and failure detection related tasks, sends out some keep alive messages ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-sys-datafiles-table.html
The INNODB_SYS_DATAFILES table provides data file path information for InnoDB file-per-table and general tablespaces, equivalent to the information in the SYS_DATAFILES table in the InnoDB data dictionary. For related usage information and ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-memcached-dml.html
Benchmarks suggest that the daemon_memcached plugin speeds up DML operations (inserts, updates, and deletes) more than it speeds up queries. Therefore, consider focussing initial development efforts on write-intensive applications that are ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-turning-off.html
Oracle recommends InnoDB as the preferred storage engine for typical database applications, from single-user wikis and blogs running on a local system, to high-end applications pushing the limits of performance. In MySQL 5.7, InnoDB is the default ...
https://dev.mysql.com/doc/refman/5.7/en/mysqldump-sql-format.html
This section describes how to use mysqldump to create SQL-format dump files. For information about reloading such dump files, see Section 7.4.2, “Reloading SQL-Format Backups”. By default, mysqldump writes information as SQL statements to the ...