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https://dev.mysql.com/doc/refman/8.0/en/drop-database.html
DROP {DATABASE | SCHEMA} [IF EXISTS] db_name DROP DATABASE drops all tables in the database and deletes the database. Dropping a database does not remove any TEMPORARY tables that were created in that database. TEMPORARY tables are automatically ...
https://dev.mysql.com/doc/refman/8.0/en/encryption-functions.html
One way to make collisions detectable is to make the hash column a primary key. Alternatively, start the mysql client with --skip-binary-as-hex to cause all binary values to be displayed as text.) If either function argument is NULL, the function ...
https://dev.mysql.com/doc/refman/8.0/en/estimating-performance.html
For small tables, you can usually find a row in one disk seek (because the index is probably cached). For bigger tables, you can estimate that, using B-tree indexes, you need this many seeks to find a row: log(row_count) / log(index_block_length / 3 ... In most cases, you can estimate query performance by counting disk ...
https://dev.mysql.com/doc/refman/8.0/en/faqs-general.html
For the syntax required to perform multiple-table updates, see Section 15.2.17, “UPDATE Statement”; for that required to perform multiple-table deletes, see Section 15.2.2, “DELETE Statement”. A multiple-table insert can be accomplished ...
https://dev.mysql.com/doc/refman/8.0/en/firewall-installation.html
MySQL Enterprise Firewall installation is a one-time operation that installs the elements described in Section 8.4.7.1, “Elements of MySQL Enterprise Firewall”. Installation can be performed using a graphical interface or manually: On Windows, ...
https://dev.mysql.com/doc/refman/8.0/en/flow-control-functions.html
The default return type of IF() (which may matter when it is stored into a temporary table) is calculated as follows: If expr2 or expr3 produce a string, the result is a string. The second syntax returns the result for the first condition that is ...
https://dev.mysql.com/doc/refman/8.0/en/group-by-functional-dependence.html
The following discussion provides several examples of the ways in which MySQL detects functional dependencies. The examples use this notation: {X} -> {Y} Understand this as “X uniquely determines Y,” which also means that Y is functionally ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-monitoring.html
These Performance Schema tables display information specific to Group Replication: replication_group_member_stats: See Section 20.4.4, “The replication_group_member_stats Table”. These Performance Schema replication tables also show information ... You can use the MySQL Performance Schema to monitor Group ...
https://dev.mysql.com/doc/refman/8.0/en/help.html
Its proper operation requires that the help tables in the mysql database be initialized with help topic information (see Section 7.1.17, “Server-Side Help Support”). The HELP statement searches the help tables for the given search string and ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-performance-midpoint_insertion.html
The goal is to make sure that frequently accessed (“hot”) pages remain in the buffer pool, even as read-ahead and full table scans bring in new blocks that might or might not be accessed afterward. You can control the insertion point in the LRU ... Rather than using a strict LRU algorithm, InnoDB uses a technique to minimize the amount of data that is brought into the buffer pool and never accessed ...