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https://dev.mysql.com/doc/refman/5.7/en/tracing-example.html
Now we can examine the trace, whose first column (QUERY), containing the original statement to be traced, is shown here: SELECT * FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE\G *************************** 1. row *************************** QUERY: SELECT ...
https://dev.mysql.com/doc/refman/5.7/en/trigger-metadata.html
To obtain metadata about triggers: Query the TRIGGERS table of the INFORMATION_SCHEMA database.
https://dev.mysql.com/doc/refman/5.7/en/tutorial.html
This chapter provides a tutorial introduction to MySQL by showing how to use the mysql client program to create and use a simple database. If you are interested only in accessing an existing database, you may want to skip the sections that describe ...mysql (sometimes referred to as the “terminal monitor” or just “monitor”) is an interactive program that enables you to connect to a MySQL server, run queries, and view the ...
https://dev.mysql.com/doc/refman/5.7/en/update.html
For information about generated columns, see Section 13.1.18.7, “CREATE TABLE and Generated Columns”. UPDATE is a DML statement that modifies rows in a table. Single-table syntax: UPDATE [LOW_PRIORITY] [IGNORE] table_reference SET ...
https://dev.mysql.com/doc/refman/5.7/en/version-tokens-usage.html
These functions permit the server's list of version tokens to be created, changed, removed, and inspected: version_tokens_set() completely replaces the current list and assigns a new list. Before using Version Tokens, install it according to the ...
https://dev.mysql.com/doc/refman/5.7/en/view-metadata.html
To obtain metadata about views: Query the VIEWS table of the INFORMATION_SCHEMA database.
https://dev.mysql.com/doc/refman/5.7/en/host-cache.html
The server handles entries in the host cache like this: When the first TCP client connection reaches the server from a given IP address, a new cache entry is created to record the client IP, host name, and client lookup validation flag. Only ... The ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-api-definition.html
Decreasing this parameter online after any tables have been created or modified with DefaultHashMapSize equal to 3840 is not currently supported. Time elapsed during node connection attempts is not taken into account when calculating elapsed time ...
https://dev.mysql.com/doc/refman/5.7/en/ansi-diff-comments.html
In this case, the generated statement looks like this: UPDATE account SET balance=balance--1 WHERE account_id=5752; balance--1 is valid standard SQL, but -- is interpreted as the start of a comment, and part of the expression is discarded. The ...
https://dev.mysql.com/doc/refman/5.7/en/condition-filtering.html
Condition filtering enables the optimizer to use other relevant conditions in the WHERE clause not taken into account by the access method, and thus improve its prefix row count estimates. It was not already taken into account by the access method.