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https://dev.mysql.com/doc/refman/8.0/en/range-optimization.html
The range access method uses a single index to retrieve a subset of table rows that are contained within one or several index value intervals. To update table index statistics for best estimates, use ANALYZE TABLE. In MySQL 8.0, index dive skipping ...The following sections describe conditions under which the optimizer uses range ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-buffer-pool.html
The buffer pool is an area in main memory where InnoDB caches table and index data as it is accessed. A table scan, performed for a mysqldump operation or a SELECT statement with no WHERE clause, for example, can bring a large amount of data into ...The buffer pool permits frequently used data to be accessed directly from memory, which speeds up ...
https://dev.mysql.com/doc/refman/8.0/en/enum.html
An ENUM is a string object with a value chosen from a list of permitted values that are enumerated explicitly in the column specification at table creation time. Handling of Enumeration Literals Trailing spaces are automatically deleted from ENUM ...Creating and Using ENUM Columns Index Values for Enumeration Literals Handling of Enumeration Literals Empty or NULL Enumeration Values Enumeration Sorting Enumeration Limitations Creating and Using ENUM Columns An enumeration value must be a quoted string ...
https://dev.mysql.com/doc/refman/8.0/en/account-categories.html
For example, the CREATE USER privilege enables not only creation of new accounts, but modification and removal of existing accounts. Without the system user concept, a user who has the CREATE USER privilege can modify or drop any existing account, ... As of MySQL 8.0.16, MySQL incorporates the concept of user account categories, based on the SYSTEM_USER ...
https://dev.mysql.com/doc/refman/8.0/en/statement-caching.html
Metadata changes occur for DDL statements such as those that create, drop, alter, rename, or truncate tables, or that analyze, optimize, or repair tables. Table content changes (for example, with INSERT or UPDATE) do not change metadata, nor do ...
https://dev.mysql.com/doc/refman/8.0/en/ibd2sdi.html
ibd2sdi is a utility for extracting serialized dictionary information (SDI) from InnoDB tablespace files. ibd2sdi can be run on file-per-table tablespace files (*.ibd files), general tablespace files (*.ibd files), system tablespace files (ibdata* ...ibd2sdi can be used at runtime or while the server is ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-mgm-client-commands.html
Since there is currently no way using ndb_mgm or the mysql client to remove all data from a specific data node or node group, this means that the command succeeds only in the two following cases: After issuing CREATE NODEGROUP in the ndb_mgm client, ...Commands for the event logs are given in Section 25.6.3, “Event Reports Generated in NDB Cluster”; commands for creating backups and restoring from them are provided in Section 25.6.8, “Online Backup of NDB ...
https://dev.mysql.com/doc/refman/8.0/en/show-triggers.html
row *************************** Trigger: ins_sum Event: INSERT Table: account Statement: SET @sum = @sum + NEW.amount Timing: BEFORE Created: 2018-08-08 10:10:12.61 sql_mode: ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES, NO_ZERO_IN_DATE,NO_ZERO_DATE, ...
https://dev.mysql.com/doc/refman/8.0/en/pluggable-authentication.html
When a client connects to the MySQL server, the server uses the user name provided by the client and the client host to select the appropriate account row from the mysql.user system table. Pluggable authentication makes it possible for clients to ...The server then authenticates the client, determining from the account row which authentication plugin applies to the client: If the server cannot find the plugin, an error occurs and the connection attempt is ...
https://dev.mysql.com/doc/refman/8.0/en/windows-pluggable-authentication.html
As a result of this exchange, the server creates a security context object that represents the identity of the client in the Windows OS. Windows pluggable authentication provides these capabilities: External authentication: Windows authentication ...