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https://dev.mysql.com/doc/refman/8.0/en/mathematical-functions.html
(Note that π radians equals 180 degrees.) Returns NULL if X is NULL. ABS(X) Returns the absolute value of X, or NULL if X is NULL. An implication of this is that ABS(-9223372036854775808) produces an error because the result cannot be stored in a ...
https://dev.mysql.com/doc/refman/8.0/en/monitor-alter-table-performance-schema.html
Note InnoDB ALTER TABLE stage events do not currently account for the addition of spatial indexes. You can monitor ALTER TABLE progress for InnoDB tables using Performance Schema. There are seven stage events that represent different phases of ...
https://dev.mysql.com/doc/refman/8.0/en/multifactor-authentication.html
Note It is not permitted to use any internal credential storage plugins (caching_sha2_password or mysql_native_password) for factor 2 or 3. Authentication involves one party establishing its identity to the satisfaction of a second party.
https://dev.mysql.com/doc/refman/8.0/en/multiple-column-indexes.html
Note As an alternative to a composite index, you can introduce a column that is “hashed” based on information from other columns. MySQL can create composite indexes (that is, indexes on multiple columns). For certain data types, you can index a ...
https://dev.mysql.com/doc/refman/8.0/en/multiple-key-caches.html
Note As of MySQL 8.0, the compound-part structured-variable syntax discussed here for referring to multiple MyISAM key caches is deprecated. Shared access to the key cache improves performance but does not eliminate contention among sessions ...
https://dev.mysql.com/doc/refman/8.0/en/multiple-tables.html
The pet table keeps track of which pets you have. If you want to record other information about them, such as events in their lives like visits to the vet or when litters are born, you need another table. What should this table look like? It needs ...
https://dev.mysql.com/doc/refman/8.0/en/multiple-unix-servers.html
Note The discussion here uses mysqld_safe to launch multiple instances of MySQL. For MySQL installation using an RPM distribution, server startup and shutdown is managed by systemd on several Linux platforms. On these platforms, mysqld_safe is not ...
https://dev.mysql.com/doc/refman/8.0/en/myisamchk-repair-options.html
--parallel-recover, -p Command-Line Format --parallel-recover Note This option is deprecated in MySQL 8.0.28 and removed in MySQL 8.0.30. --correct-checksum Command-Line Format --correct-checksum Correct the checksum information for the table.
https://dev.mysql.com/doc/refman/8.0/en/myisampack.html
Please note the following: If the mysqld server was invoked with external locking disabled, it is not a good idea to invoke myisampack if the table might be updated by the server during the packing process. When the table is used later, the server ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-config-file.html
Note It is possible to roll back to a previous configuration by deleting later configuration cache files, or by renaming an earlier cache file so that it has a higher seq_id. Configuring NDB Cluster requires working with two files: my.cnf: ...