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https://dev.mysql.com/doc/refman/8.4/en/optimizing-innodb-diskio.html
For example, creating a new MySQL instance and its associated data files could cause large surges of disk write activity, impeding the performance of other MySQL instances that use the same storage devices. (It is necessary to use the mount option ... If you follow best practices for database design and tuning techniques for SQL operations, but your database is still slow due to heavy disk I/O activity, consider these disk I/O ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-quick-start.html
| events_stages_current | | events_stages_history | | events_stages_history_long | | events_stages_summary_by_account_by_event_name | | events_stages_summary_by_host_by_event_name | | events_stages_summary_by_thread_by_event_name | | ... This ...
https://dev.mysql.com/doc/refman/8.4/en/replication-channels.html
This channel is always present; it cannot be created or destroyed by the user. The maximum number of channels that can be created on one replica server in a multi-source replication topology is 256. To provide compatibility with previous versions, ... In MySQL multi-source replication, a replica opens multiple replication channels, one for each source ...
https://dev.mysql.com/doc/refman/8.4/en/replication-howto-additionalslaves.html
To do this, you can set up the new replica by copying the data directory of an existing replica, and giving the new replica a different server ID (which is user-specified) and server UUID (which is generated at startup). Note If the replication ...
https://dev.mysql.com/doc/refman/8.4/en/show-index.html
These two statements are equivalent: SHOW INDEX FROM mytable FROM mydb; SHOW INDEX FROM mydb.mytable; The optional EXTENDED keyword causes the output to include information about hidden indexes that MySQL uses internally and are not accessible by ...
https://dev.mysql.com/doc/refman/8.4/en/switchable-optimizations.html
The parent query does not set a user variable, since rewriting it may affect the order of execution, which could lead to unexpected results if the variable is accessed more than once in the same query. Its value is a set of flags, each of which has ...
https://dev.mysql.com/doc/mysql-enterprise-backup/8.4/en/mysqlbackup.full.html
After you have created a full backup, you might perform incremental backups (which are smaller and faster) for the next several backup tasks. This section outlines some of the things to consider when deciding on a strategy for creating full backups.
https://dev.mysql.com/doc/mysql-errors/8.4/en/client-error-reference.html
Error number: 2072; Symbol: CR_INVALID_FACTOR_NO; Message: Invalid first argument for MYSQL_OPT_USER_PASSWORD option. Client error messages originate from within the MySQL client library. Here is an example client error message, as displayed by the ...
https://dev.mysql.com/doc/extending-mysql/8.4/en/writing-audit-plugins.html
The first time the server calls event_notify for a thread, it creates a binding of the plugin to the thread. */ MYSQL_AUDIT_CONNECTION_DISCONNECT = 1 << 1, /** occurs after COM_CHANGE_USER RPC is completed. */ MYSQL_AUDIT_CONNECTION_PRE_AUTHENTICATE ... This section describes how to write a server-side audit plugin, using the example plugin found in the plugin/audit_null directory of MySQL source ...
https://dev.mysql.com/doc/mysql-shell/9.4/en/innodb-clusterset-failover.html
In the case of a network partition, the failover can create a split-brain situation, where the different parts of the topology have divergent transaction sets. To carry out an emergency failover for the primary InnoDB Cluster, follow this procedure: ... An emergency failover makes a selected replica cluster into the primary InnoDB Cluster for the InnoDB ClusterSet ...