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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-quick-start.html
For example, setup_instruments lists the set of instruments for which events can be collected and shows which of them are enabled: mysql> SELECT NAME, ENABLED, TIMED FROM performance_schema.setup_instruments; ...For example, use these lines in the ... This section briefly introduces the Performance Schema with examples that show how to use ...
https://dev.mysql.com/doc/refman/8.0/en/analyze-table.html
MySQL 8.0.31 and later also supports setting the histogram of a single column to a user-defined JSON value. This issue is resolved in MySQL 8.0.24 (and later), where ANALYZE TABLE no longer causes subsequent operations to wait. MySQL uses the stored ...ANALYZE [NO_WRITE_TO_BINLOG | LOCAL] TABLE tbl_name UPDATE HISTOGRAM ON col_name [, col_name] ...
https://dev.mysql.com/doc/refman/8.0/en/storage-engines.html
Storage engines are MySQL components that handle the SQL operations for different table types. (The CREATE TABLE statement in MySQL 8.0 creates InnoDB tables by default.) MySQL Server uses a pluggable storage engine architecture that enables ...
https://dev.mysql.com/doc/refman/8.0/en/general-tablespaces.html
The server keeps tablespace metadata in memory for the lifetime of a tablespace. General tablespace data files can be placed in a directory relative to or independent of the MySQL data directory, which provides you with many of the data file and ...
https://dev.mysql.com/doc/refman/8.0/en/replication-options-gtids.html
A SET @@GLOBAL.gtid_purged statement was issued on MySQL 5.7.7 or earlier, and the binary log that was active at the time of the SET @@GLOBAL.gtid_purged statement has not yet been purged. gtid_executed_compression_period Command-Line Format ... The ...For additional information, see Section 19.1.3, “Replication with Global Transaction ...
https://dev.mysql.com/doc/refman/8.0/en/json-attribute-functions.html
Prior to MySQL 8.0.26, an error is also raised if the path expression contains a * or ** wildcard. mysql> SELECT JSON_VALID('{"a": 1}'); +------------------------+ | JSON_VALID('{"a": 1}') | +------------------------+ | 1 | ... The functions in this ...
https://dev.mysql.com/doc/refman/8.0/en/dbug-package.html
Here are some example debug control strings as they might be specified on a shell command line: --debug=d:t --debug=d:f,main,subr1:F:L:t,20 --debug=d,input,output,files:n --debug=d:t:i:O,\\mysqld.trace For mysqld, it is also possible to change DBUG ... The MySQL server and most MySQL clients are compiled with the DBUG package originally created by Fred ...The ...
https://dev.mysql.com/doc/refman/8.0/en/backup-types.html
(For example, the implementation may use copy-on-write techniques so that only parts of the file system modified after the snapshot time need be copied.) MySQL itself does not provide the capability for taking file system snapshots. Full Versus ...
https://dev.mysql.com/doc/refman/8.0/en/comments.html
MySQL Server supports three comment styles: From a # character to the end of the line. In MySQL, the -- (double-dash) comment style requires the second dash to be followed by at least one whitespace or control character, such as a space or tab.
https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-operations.html
When you add a primary key using the ALGORITHM=COPY clause, MySQL converts NULL values in the associated columns to default values: 0 for numbers, an empty string for character-based columns and BLOBs, and 0000-00-00 00:00:00 for DATETIME. A newly ... Online support details, syntax examples, and usage notes for DDL operations are provided under the following topics in this ...