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https://dev.mysql.com/doc/refman/9.7/en/primary-key-optimization.html
The primary key for a table represents the column or set of columns that you use in your most vital queries. Query performance benefits from the NOT NULL optimization, because it cannot include any NULL values. With the InnoDB storage engine, the ...
https://dev.mysql.com/doc/refman/9.7/en/mysql-cluster-option-tables.html
The following list includes command-line options, system variables, and status variables applicable within mysqld when it is running as an SQL node in an NDB Cluster. For a reference to all command-line options, system variables, and status ...
https://dev.mysql.com/doc/refman/9.7/en/optimizing-innodb-bulk-data-loading.html
These performance tips supplement the general guidelines for fast inserts in Section 10.2.5.1, “Optimizing INSERT Statements”. When importing data into InnoDB, turn off autocommit mode, because it performs a log flush to disk for every insert.
https://dev.mysql.com/doc/refman/9.7/en/group-replication-frequently-asked-questions.html
What is the maximum number of MySQL servers in a group? A group can consist of maximum 9 servers. Attempting to add another server to a group with 9 members causes the request to join to be refused. This limit has been identified from testing and ...
https://dev.mysql.com/doc/refman/9.7/en/comparison-operators.html
Table 14.4 Comparison Operators Name Description > Greater than operator >= Greater than or equal operator < Less than operator <>, != Not equal operator <= Less than or equal operator <=> NULL-safe equal to operator = Equal operator BETWEEN ...
https://dev.mysql.com/doc/refman/9.7/en/create-table.html
| {FULLTEXT | SPATIAL} [INDEX | KEY] [index_name] (key_part,...) [index_option] ... | [CONSTRAINT [symbol]] UNIQUE [INDEX | KEY] [index_name] [index_type] (key_part,...) [index_option] ... (Some valid select or union statement) CREATE TABLE creates ...
https://dev.mysql.com/doc/refman/9.7/en/system-schema.html
It contains tables that store information required by the MySQL server as it runs. A broad categorization is that the mysql schema contains data dictionary tables that store database object metadata, and system tables used for other operational ...
https://dev.mysql.com/doc/refman/9.7/en/delete.html
DELETE is a DML statement that removes rows from a table. A DELETE statement can start with a WITH clause to define common table expressions accessible within the DELETE. Single-Table Syntax DELETE [LOW_PRIORITY] [QUICK] [IGNORE] FROM tbl_name ...
https://dev.mysql.com/doc/refman/9.7/en/faqs-general.html
Why did MySQL version numbering skip versions 6 and 7 and go straight to 8.0? A.1.3. Does MySQL have a NOW() function with fractions of seconds? A.1.7. Which version of MySQL is production-ready (GA)? MySQL 26.10, 8.4, and 8.0 are actively supported ...
https://dev.mysql.com/doc/refman/9.7/en/mysql-command-options.html
mysql supports the following options, which can be specified on the command line or in the [mysql] and [client] groups of an option file. For information about option files used by MySQL programs, see Section 6.2.2.2, “Using Option Files”.