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https://dev.mysql.com/doc/refman/8.0/en/help.html
HELP 'search_string' The HELP statement returns online information from the MySQL Reference Manual. Its proper operation requires that the help tables in the mysql database be initialized with help topic information (see Section 7.1.17, ...
https://dev.mysql.com/doc/refman/8.0/en/identifier-mapping.html
The following names are reserved and appended with @@@ if used in schema or table names: CON PRN AUX NUL COM1 through COM9 LPT1 through LPT9 CLOCK$ is also a member of this group of reserved names, but is not appended with @@@, but @0024 instead.
https://dev.mysql.com/doc/refman/8.0/en/identifiers.html
Certain objects within MySQL, including database, table, index, column, alias, view, stored procedure, partition, tablespace, resource group and other object names are known as identifiers. Section 11.2.1, “Identifier Length Limits”, indicates ...
https://dev.mysql.com/doc/refman/8.0/en/index-btree-hash.html
In other words, to be able to use an index, a prefix of the index must be used in every AND group. Understanding the B-tree and hash data structures can help predict how different queries perform on different storage engines that use these data ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-general-table-reference.html
The following table summarizes INFORMATION_SCHEMA general tables. For greater detail, see the individual table descriptions. Table 28.2 INFORMATION_SCHEMA General Tables Table Name Description Introduced Deprecated ADMINISTRABLE_ROLE_AUTHORIZATIONS ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-metrics-table.html
You can also perform these actions for a group of counters using their common module name. The INNODB_METRICS table provides a wide variety of InnoDB performance information, complementing the specific focus areas of the Performance Schema tables ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-mysql-firewall-users-table.html
The MYSQL_FIREWALL_USERS table provides a view into the in-memory data cache for MySQL Enterprise Firewall. It lists names and operational modes of registered firewall account profiles. It is used in conjunction with the mysql.firewall_users system ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-mysql-firewall-whitelist-table.html
The MYSQL_FIREWALL_WHITELIST table provides a view into the in-memory data cache for MySQL Enterprise Firewall. It is used in conjunction with the mysql.firewall_whitelist system table that provides persistent storage of firewall data; see MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-autocommit-commit-rollback.html
Grouping DML Operations with Transactions By default, connection to the MySQL server begins with autocommit mode enabled, which automatically commits every SQL statement as you execute it. If autocommit mode is enabled, each SQL statement forms a ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-benefits.html
It is very fast to reference the primary key columns in WHERE clauses, ORDER BY clauses, GROUP BY clauses, and join operations. InnoDB tables have the following benefits: If the server unexpectedly exits because of a hardware or software issue, ...