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https://dev.mysql.com/doc/refman/8.0/en/innodb-index-types.html
Each InnoDB table has a special index called the clustered index that stores row data. When you define a PRIMARY KEY on a table, InnoDB uses it as the clustered index. If you do not define a PRIMARY KEY for a table, InnoDB uses the first UNIQUE ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-innodb_cmp.html
The INNODB_CMP and INNODB_CMP_RESET tables provide status information about operations related to compressed tables, which are described in Section 17.9, “InnoDB Table and Page Compression”. These two tables have identical contents, but reading ...For example, if you archive the output of INNODB_CMP_RESET every 60 minutes, you see the statistics for each hourly ...
https://dev.mysql.com/doc/refman/8.0/en/manual-info.html
Typographical and Syntax Conventions This manual uses certain typographical conventions: Text in this style is used for SQL statements; database, table, and column names; program listings and source code; and environment variables. Example: “To ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-api-definition.html
If no HostName is specified in a given [mysql] or [api] section of the config.ini file, then an SQL or API node may connect using the corresponding “slot” from any host which can establish a network connection to the management server host ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-configuration-overview.html
Each of the node parameter tables lists the parameters for a given type (ndbd, ndb_mgmd, mysqld, computer, tcp, or shm). All tables include the data type for the parameter, option, or variable, as well as its default, minimum, and maximum values as ...When performing a node restart or an initial node restart, all of the cluster's data nodes must be restarted in turn (also referred to as a rolling ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-replication.html
Although an NDB Cluster itself depends on the NDB storage engine for clustering functionality, it is not necessary to use NDB as the storage engine for the replica's copies of the replicated tables (see Replication from NDB to other storage engines). By comparing the values of these status variables before and after the execution of statements affecting replicated NDB tables, you can observe the corresponding actions taken on the NDB API level by the replica, which can be useful when monitoring or troubleshooting NDB Cluster ...
https://dev.mysql.com/doc/refman/8.0/en/optimizer-issues.html
Use ANALYZE TABLE tbl_name to update the key distributions for the scanned table. Use FORCE INDEX for the scanned table to tell MySQL that table scans are very expensive compared to using the given index: SELECT * FROM t1, t2 FORCE INDEX ... MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-functions.html
The units indicator depends on the size of the byte-count argument as shown in the following table. The units indicator depends on the size of the time-value argument as shown in the following table. The thread ID return value is a value of the type ... As of MySQL 8.0.16, MySQL includes built-in SQL functions that format or retrieve Performance Schema data, and that may be used as equivalents for the corresponding sys schema stored ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-variables.html
sql_mode is also replicated except for the NO_DIR_IN_CREATE mode; the replica always preserves its own value for NO_DIR_IN_CREATE, regardless of changes to it on the source. However, when mysqlbinlog parses a SET @@sql_mode = mode statement, the ...
https://dev.mysql.com/doc/refman/8.0/en/selecting-all.html
Fix only the erroneous record with an UPDATE statement: mysql> UPDATE pet SET birth = '1989-08-31' WHERE name = 'Bowser'; The UPDATE changes only the record in question and does not require you to reload the table. If a table contains invisible ...