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https://dev.mysql.com/doc/refman/5.7/en/order-by-optimization.html
Whether the optimizer actually does so depends on whether reading the index is more efficient than a table scan if columns not in the index must also be read. In that case, scanning an entire index and looking up table rows to find columns not in ...
https://dev.mysql.com/doc/refman/5.7/en/outer-join-optimization.html
MySQL implements an A LEFT JOIN B join_specification as follows: Table B is set to depend on table A and all tables on which A depends. Table A is set to depend on all tables (except B) that are used in the LEFT JOIN condition. The LEFT JOIN ...If ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-hash.html
To partition a table using HASH partitioning, it is necessary to append to the CREATE TABLE statement a PARTITION BY HASH (expr) clause, where expr is an expression that returns an integer. In addition, you most likely want to follow this with ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-thread-filtering.html
The threads table contains a row for each server thread. For the Performance Schema to monitor a thread, these things must be true: The thread_instrumentation consumer in the setup_consumers table must be YES. Monitoring occurs only for those ...
https://dev.mysql.com/doc/refman/5.7/en/privilege-changes.html
If the mysqld server is started without the --skip-grant-tables option, it reads all grant table contents into memory during its startup sequence. The in-memory tables become effective for access control at that point. If you modify the grant ...
https://dev.mysql.com/doc/refman/5.7/en/replication-options-reference.html
gtid_executed_compression_period: Compress gtid_executed table each time this many transactions have occurred. master_info_repository: Whether to write connection metadata repository, containing source information and replication I/O thread location ... The following two sections provide basic information about the MySQL command-line options and system variables applicable to replication and the binary ...
https://dev.mysql.com/doc/refman/5.7/en/replication-snapshot-method.html
If your database is stored in binary portable files, you can copy the raw data files to a replica. Choose one of these options: Exclude all the tables in the database using --ignore-table option. Employing this method with a table using a storage ...
https://dev.mysql.com/doc/refman/5.7/en/show-slave-status.html
This is similar to the information available from the SHOW SLAVE STATUS statement, but represented in table form. Replicate_Do_Table, Replicate_Ignore_Table, Replicate_Wild_Do_Table, Replicate_Wild_Ignore_Table The lists of tables that were ... SHOW ...
https://dev.mysql.com/doc/refman/5.7/en/audit-log-filtering.html
Note As of MySQL 5.7.13, for audit log filtering to work as described here, the audit log plugin and the accompanying audit tables and functions must be installed. If the plugin is installed without the accompanying audit tables and functions ...
https://dev.mysql.com/doc/refman/5.7/en/charset-examples.html
Example 1: Table and Column Definition CREATE TABLE t1 ( c1 CHAR(10) CHARACTER SET latin1 COLLATE latin1_german1_ci ) DEFAULT CHARACTER SET latin2 COLLATE latin2_bin; Here we have a column with a latin1 character set and a latin1_german1_ci ... The ...