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https://dev.mysql.com/doc/refman/8.0/en/user-resources.html
For example, to remove the limit on how many times per hour francis can connect, use this statement: mysql> ALTER USER 'francis'@'localhost' WITH MAX_CONNECTIONS_PER_HOUR 0; As mentioned previously, the simultaneous-connection limit for an account ...Only statements that modify databases or tables count against the update ... One means of restricting client use of MySQL server resources ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-deadlocks-handling.html
You can cope with deadlocks and reduce the likelihood of their occurrence with the following techniques: At any time, issue SHOW ENGINE INNODB STATUS to determine the cause of the most recent deadlock. For example, organize database operations into ...It explains how to organize database operations to minimize deadlocks and the subsequent error handling required in ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-columns.html
Columns using other data types relating to dates or times are not supported as partitioning columns. The next two sections discuss COLUMNS partitioning, which are variants on RANGE and LIST partitioning. All of these columns are taken into account ...COLUMNS partitioning enables the use of multiple columns in partitioning ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-optimization.html
Some INFORMATION_SCHEMA tables contain columns that provide table statistics: STATISTICS.CARDINALITY TABLES.AUTO_INCREMENT TABLES.AVG_ROW_LENGTH TABLES.CHECKSUM TABLES.CHECK_TIME TABLES.CREATE_TIME TABLES.DATA_FREE TABLES.DATA_LENGTH ...Note ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-config-file.html
config.ini: This file, sometimes known as the global configuration file, is read only by the NDB Cluster management server, which then distributes the information contained therein to all processes participating in the cluster. This includes ...
https://dev.mysql.com/doc/refman/8.0/en/replication-mode-change-online-verify-transactions.html
This section explains how to monitor a replication topology and verify that all anonymous transactions have been replicated. Or wait for a day, or whatever time period you consider safe for your deployment. A safer method in the sense that it does ...This is helpful when changing the replication mode online as you can verify that it is safe to change to GTID ...
https://dev.mysql.com/doc/refman/8.0/en/compatibility.html
We use the phrase “the SQL standard” or “standard SQL” to mean the current version of the SQL Standard at any time. This section describes how MySQL relates to the ANSI/ISO SQL standards. MySQL Server has many extensions to the SQL ...We ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-adding-instances.html
It is now time to expand the group by adding the other two servers configured previously. If you did not have binary logging enabled when you configured the user credentials on s1, and a remote cloning operation is not used for state transfer, you ... At this point, the group has one member in it, server s1, which has some data in ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-background.html
The group can operate in a single-primary mode with automatic primary election, where only one server accepts updates at a time. There is a built-in group membership service that keeps the view of the group consistent and available for all servers ...The most common way to create a fault-tolerant system is to resort to making components redundant, in other words the component can be removed and the system should continue to operate as ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-statistics-table.html
To update cached values at any time for a given table, use ANALYZE TABLE. The information_schema_stats_expiry system variable defines the period of time before cached table statistics expire. Note If the innodb_read_only system variable is enabled, ...If there are no cached statistics or statistics have expired, statistics are retrieved from storage engines when querying table statistics ...