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https://dev.mysql.com/doc/refman/8.0/en/firewall-installation.html
It refers to Windows Firewall and controls whether Windows blocks the TCP/IP port on which the MySQL server listens for client connections.) Important There is an issue for MySQL 8.0.19 installed using MySQL Installer that prevents the server from ... MySQL Enterprise Firewall installation is a one-time operation that installs the elements described in Section 8.4.7.1, “Elements of MySQL Enterprise ...
https://dev.mysql.com/doc/refman/8.0/en/function-resolution.html
For example, either of the following function calls are legal: SELECT COUNT(*) FROM mytable; SELECT COUNT (*) FROM mytable; However, enabling IGNORE_SPACE also has the side effect that the parser treats the affected function names as reserved words ... MySQL supports built-in (native) functions, loadable functions, and stored ...
https://dev.mysql.com/doc/refman/8.0/en/getting-information.html
To find out which database is currently selected, use the DATABASE() function: mysql> SELECT DATABASE(); +------------+ | DATABASE() | +------------+ | menagerie | +------------+ If you have not yet selected any database, the result is NULL. What ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-communication-protocol.html
For example: SELECT group_replication_set_communication_protocol("5.7.25"); If you upgrade all the members of a replication group to a new MySQL Server release, the group's communication protocol version is not automatically upgraded to match. For ... From MySQL 8.0.16, Group Replication has the concept of a communication protocol for the ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-functions-for-member-actions.html
Example: SELECT group_replication_disable_member_action("mysql_disable_super_read_only_if_primary", "AFTER_PRIMARY_ELECTION"); For more information, see Section 20.5.1.5, “Configuring Member Actions”. Example: SELECT ... The following functions ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-trx-table.html
To resolve a deadlock, InnoDB selects the transaction with the smallest weight as the “victim” to roll back. TRX_AUTOCOMMIT_NON_LOCKING A value of 1 indicates the transaction is a SELECT statement that does not use the FOR UPDATE or LOCK IN ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-deadlocks.html
A deadlock can occur when transactions lock rows in multiple tables (through statements such as UPDATE or SELECT ... FOR UPDATE) in each transaction; create indexes on the columns used in SELECT ... A deadlock is a situation in which multiple ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-temp-table-info.html
mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_TEMP_TABLE_INFO\G An empty set is returned because INNODB_TEMP_TABLE_INFO and its data are not persisted to disk when the server is shut down. INNODB_TEMP_TABLE_INFO provides information about ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-performance-spin_lock_polling.html
That number is generated by randomly selecting an integer ranging from 0 up to but not including the innodb_spin_wait_delay value, and multiplying that value by 50. InnoDB mutexes and rw-locks are typically reserved for short intervals. On a ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-tablespace-autoextend-size.html
By default, when a file-per-table or general tablespace requires additional space, the tablespace is extended incrementally according to the following rules: If the tablespace is less than an extent in size, it is extended one page at a time. If ...