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https://dev.mysql.com/doc/refman/8.0/en/replication-solutions-backups-read-only.html
Note The instructions in this section place the server to be backed up in a state that is safe for backup methods that get the data from the server, such as mysqldump (see Section 6.5.4, “mysqldump — A Database Backup Program”). You should not ...
https://dev.mysql.com/doc/refman/8.0/en/row-constructor-optimization.html
Consider the following table, which has a primary key on (c1, c2, c3): CREATE TABLE t1 ( c1 INT, c2 INT, c3 INT, c4 CHAR(100), PRIMARY KEY(c1,c2,c3) ); In this query, the WHERE clause uses all columns in the index. row *************************** ...
https://dev.mysql.com/doc/refman/8.0/en/show-processlist.html
Note As of MySQL 8.0.22, an alternative implementation for SHOW PROCESSLIST is available based on the Performance Schema processlist table, which, unlike the default SHOW PROCESSLIST implementation, does not require a mutex and has better ...This is ... SHOW [FULL] PROCESSLIST Important The INFORMATION SCHEMA implementation of SHOW PROCESSLIST is deprecated and subject to removal in a future MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/spatial-reference-systems.html
MySQL maintains information about available spatial reference systems for spatial data in the data dictionary mysql.st_spatial_reference_systems table, which can store entries for projected and geographic SRSs. This data dictionary table is ... A ...
https://dev.mysql.com/doc/refman/8.0/en/sys-ps-thread-trx-info.html
The information includes the current transaction, and the statements it has already executed, derived from the Performance Schema events_transactions_current and events_statements_history tables. The value should match the THREAD_ID column from some ... Returns a JSON object containing information about a given ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-auto-increment-columns.html
This view indicates which tables have AUTO_INCREMENT columns and provides information about those columns, such as the current and maximum column values and the usage ratio (ratio of used to possible values). Tables in these schemas are excluded ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-redundant-indexes.html
The schema_redundant_indexes view has these columns: table_schema The schema that contains the table. The x$schema_flattened_keys view has these columns: table_schema The schema that contains the table. The schema_redundant_indexes view displays ...
https://dev.mysql.com/doc/refman/8.0/en/thread-pool-operation.html
As connections are established, the thread pool assigns them to thread groups in round-robin fashion. A statement becomes blocked if it encounters a disk I/O operation or a user level lock (row lock or table lock). Thus, given a mix of statements ...
https://dev.mysql.com/doc/refman/8.0/en/update-optimization.html
Performing multiple updates together is much quicker than doing one at a time if you lock the table. For a MyISAM table that uses dynamic row format, updating a row to a longer total length may split the row. If you do this often, it is very ... An ...
https://dev.mysql.com/doc/refman/8.0/en/window-functions-usage.html
For example, if a table contains a TIMESTAMP column named ts, standard SQL permits PARTITION BY ts but not PARTITION BY HOUR(ts), whereas MySQL permits both. However, whereas an aggregate operation groups query rows into a single result row, a ...