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https://dev.mysql.com/doc/refman/8.0/en/source-configuration-third-party.html
Third-party tools that need to determine the MySQL version from the MySQL source can read the MYSQL_VERSION file in the top-level source directory. For example, if the version is MySQL 8.0.36, the file looks like this: MYSQL_VERSION_MAJOR=8 ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema.html
MySQL 8.0 includes the sys schema, a set of objects that helps DBAs and developers interpret data collected by the Performance Schema. For new installations, the sys schema is installed by default during data directory initialization if you use ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-compression-internals.html
To avoid frequent compression failures in write-intensive workloads, such as for OLTP applications, MySQL sometimes reserves some empty space (padding) in the page, so that the modification log fills up sooner and the page is recompressed while ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-processlist-table.html
The MySQL process list indicates the operations currently being performed by the set of threads executing within the server. The processlist table contains a row for each server process: mysql> SELECT * FROM performance_schema.processlist\G ...For ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-added-deprecated-removed.html
KeepAliveSendInterval: Time between keep-alive signals on links between data nodes, in milliseconds. MaxNoOfConcurrentTransactions: Maximum number of transactions executing concurrently on this data node, total number of transactions that can be ...
https://dev.mysql.com/doc/refman/8.0/en/data-type-defaults.html
Explicit Default Handling as of MySQL 8.0.13 Explicit Default Handling Prior to MySQL 8.0.13 Implicit Default Handling Explicit Default Handling as of MySQL 8.0.13 The default value specified in a DEFAULT clause can be a literal constant or an ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-fulltext-index.html
mysql> SELECT index_id, name, table_id, space from INFORMATION_SCHEMA.INNODB_INDEXES WHERE index_id=457; +----------+------+----------+-------+ | index_id | name | table_id | space | +----------+------+----------+-------+ | 457 | idx | 327 | 283 | ... Full-text indexes are created on text-based columns (CHAR, VARCHAR, or TEXT columns) to speed up queries and DML operations on data contained within those ...
https://dev.mysql.com/doc/refman/8.0/en/persisted-system-variables.html
qualifier: SET PERSIST max_connections = 1000; SET @@PERSIST.max_connections = 1000; Like SET GLOBAL, SET PERSIST sets the global variable runtime value, but also writes the variable setting to the mysqld-auto.cnf file (replacing any existing ...A ...
https://dev.mysql.com/doc/refman/8.0/en/audit-log-file-reading.html
The start item has this format, where value is a literal timestamp value: "start": { "timestamp": "value" } The start item is permitted as of MySQL 8.0.22. Suppose that a call to obtain a bookmark produces this value: mysql> SET @mark := ...The ...
https://dev.mysql.com/doc/refman/8.0/en/order-by-optimization.html
This section describes when MySQL can use an index to satisfy an ORDER BY clause, the filesort operation used when an index cannot be used, and execution plan information available from the optimizer about ORDER BY. (The resulting sort order may be ...An ORDER BY with and without LIMIT may return rows in different orders, as discussed in Section 10.2.1.19, “LIMIT Query ...