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https://dev.mysql.com/doc/refman/8.0/en/monitor-alter-table-performance-schema.html
Enable the stage/innodb/alter% instruments: mysql> UPDATE performance_schema.setup_instruments SET ENABLED = 'YES' WHERE NAME LIKE 'stage/innodb/alter%'; Query OK, 7 rows affected (0.00 sec) Rows matched: 7 Changed: 7 Warnings: 0 Enable the stage ...
https://dev.mysql.com/doc/refman/8.0/en/option-modifiers.html
For example, the mysql client supports a --column-names option that determines whether or not to display a row of column names at the beginning of query results. However, you may want to disable it in some instances, such as when sending the output ... Some options are “boolean” and control behavior that can be turned on or ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-firewall-tables.html
Note The Performance Schema tables described here are available as of MySQL 8.0.23. Prior to MySQL 8.0.23, use the corresponding INFORMATION_SCHEMA tables instead; see MySQL Enterprise Firewall Tables. The following sections describe the ...They ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-table-characteristics.html
Many tables in the performance_schema database are read only and cannot be modified: mysql> TRUNCATE TABLE performance_schema.setup_instruments; ERROR 1683 (HY000): Invalid performance_schema usage. That might be useful, for example, after you have ... The name of the performance_schema database is lowercase, as are the names of tables within ...
https://dev.mysql.com/doc/refman/8.0/en/perl-support.html
Although earlier versions are available, they do not support the full functionality of MySQL 8.0. The Perl DBI module provides a generic interface for database access. You can write a DBI script that works with many different database engines ...
https://dev.mysql.com/doc/refman/8.0/en/precision-math-rounding.html
This section discusses precision math rounding for the ROUND() function and for inserts into columns with exact-value types (DECIMAL and integer). The ROUND() function rounds differently depending on whether its argument is exact or approximate: ...
https://dev.mysql.com/doc/refman/8.0/en/replica-connection-thread-states.html
In MySQL 8.0.26, incompatible changes were made to instrumentation names, including the names of thread stages, containing the terms “master”, which is changed to “source”, “slave”, which is changed to “replica”, and “mts” (for ... These thread states occur on a replica server but are associated with connection threads, not with the I/O or SQL ...
https://dev.mysql.com/doc/refman/8.0/en/replication-asynchronous-connection-failover-replica.html
In MySQL 8.0.27 and later, asynchronous connection failover for replicas is activated automatically for a replication channel on a Group Replication primary when you set SOURCE_CONNECTION_AUTO_FAILOVER=1 in the CHANGE REPLICATION SOURCE TO ...The ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-create-select.html
Prior to MySQL 8.0.21, the statement is logged as two transactions. As of MySQL 8.0.21, on storage engines that support atomic DDL, it is logged as one transaction. If the destination table exists and IF NOT EXISTS is given, MySQL 8.0 ignores the ...
https://dev.mysql.com/doc/refman/8.0/en/replication-howto-masterstatus.html
In a different session on the source, use the SHOW MASTER STATUS statement to determine the current binary log file name and position: mysql> SHOW MASTER STATUS\G *************************** 1. row *************************** File: mysql-bin.000003 ... To configure the replica to start the replication process at the correct point, you need to note the source's current coordinates within its binary ...