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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/subquery-restrictions.html
In general, you cannot modify a table and select from the same table in a subquery. FROM t ...); Exception: The preceding prohibition does not apply if for the modified table you are using a derived table and that derived table is materialized ...
https://dev.mysql.com/doc/refman/8.0/en/type-conversion.html
mysql> SELECT 38.8, CAST(38.8 AS CHAR); -> 38.8, '38.8' mysql> SELECT 38.8, CONCAT(38.8); -> 38.8, '38.8' See later in this section for information about the character set of implicit number-to-string conversions, and for modified rules that apply ... When an operator is used with operands of different types, type conversion occurs to make the operands ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-progress-reporting.html
The following sys schema views provide progress reporting for long-running transactions: processlist session x$processlist x$session Assuming that the required instruments and consumers are enabled, the progress column of these views shows the ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-events.html
This table provides information about event subscriptions in NDB. The columns of the events table are listed here, with short descriptions of each: event_id The event ID name The name of the event table_id The ID of the table on which the event ...
https://dev.mysql.com/doc/refman/8.0/en/example-auto-increment.html
To start with an AUTO_INCREMENT value other than 1, set that value with CREATE TABLE or ALTER TABLE, like this: mysql> ALTER TABLE tbl AUTO_INCREMENT = 100; InnoDB Notes For information about AUTO_INCREMENT usage specific to InnoDB, see Section ...
https://dev.mysql.com/doc/refman/8.0/en/fulltext-search-mecab.html
Creating a FULLTEXT Index that uses the MeCab Parser To create a FULLTEXT index that uses the mecab parser, specify WITH PARSER ngram with CREATE TABLE, ALTER TABLE, or CREATE INDEX. For InnoDB tables, minimum token size is defined by the ... The ...
https://dev.mysql.com/doc/refman/8.0/en/multifactor-authentication.html
Table 8.11 Example authentication_policy Values authentication_policy Value Effective Policy '*' Permit only creating or altering accounts with one factor. Authentication involves one party establishing its identity to the satisfaction of a second ...Multifactor authentication (MFA) is the use of multiple authentication values (or “factors”) during the authentication ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning.html
Section 26.3, “Partition Management”, covers methods of adding, removing, and altering partitions in existing partitioned tables. Note Table partitioning differs from partitioning as used by window functions. MySQL 8.0 does not currently support ...In MySQL 8.0, partitioning support is provided by the InnoDB and NDB storage ...
https://dev.mysql.com/doc/refman/8.0/en/view-algorithms.html
The optional ALGORITHM clause for CREATE VIEW or ALTER VIEW is a MySQL extension to standard SQL. For TEMPTABLE, the results from the view are retrieved into a temporary table, which then is used to execute the statement. It prefers MERGE over ...