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https://dev.mysql.com/doc/refman/8.0/en/engine-condition-pushdown-optimization.html
Joins are not directly supported; conditions involving multiple tables are pushed separately where possible. Previously, engine condition pushdown was limited to terms referring to column values from the same table to which the condition was being ... This optimization improves the efficiency of direct comparisons between a nonindexed column and a ...
https://dev.mysql.com/doc/refman/8.0/en/host-cache.html
The Performance Schema host_cache table exposes the contents of the host cache so that it can be examined using SELECT statements. It does not use the cache for TCP connections established using a loopback interface address (for example, 127.0.0.1 ... The MySQL server maintains an in-memory host cache that contains information about clients: IP address, host name, and error ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-temporary-tablespace.html
Alternatively, check the global temporary tablespace data file size on your operating system. InnoDB uses session temporary tablespaces and a global temporary tablespace. Session Temporary Tablespaces Session temporary tablespaces store ...The ...
https://dev.mysql.com/doc/refman/8.0/en/load-data-local-security.html
The LOAD DATA statement loads a data file into a table. To avoid connecting to untrusted servers, clients can establish a secure connection and verify the server identity by connecting using the --ssl-mode=VERIFY_IDENTITY option and the appropriate ...The statement can load a file located on the server host, or, if the LOCAL keyword is specified, on the client ...
https://dev.mysql.com/doc/refman/8.0/en/myisamchk-check-options.html
myisamchk supports the following options for table checking operations: --check, -c Command-Line Format --check Check the table for errors. --check-only-changed, -C Command-Line Format --check-only-changed Check only tables that have changed since ...This is the default operation if you specify no option that selects an operation type ...
https://dev.mysql.com/doc/refman/8.0/en/mysqladmin.html
drop db_name Delete the database named db_name and all its tables. Caution Do not use this command used if the server was started with the --skip-grant-tables option. This is true even if you precede the password command with flush-privileges on the ...You can use it to check the server's configuration and current status, to create and drop databases, and ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-pre-filtering.html
Pre-filtering can be applied to either the producer or consumer stage of event processing: To configure pre-filtering at the producer stage, several tables can be used: setup_instruments indicates which instruments are available. An instrument ...
https://dev.mysql.com/doc/refman/8.0/en/show-replica-status.html
This is similar to the information available from the SHOW REPLICA STATUS statement, but represented in table form. Replicate_Do_Table, Replicate_Ignore_Table, Replicate_Wild_Do_Table, Replicate_Wild_Ignore_Table The names of any tables that were ...
https://dev.mysql.com/doc/refman/8.0/en/create-event.html
This is an example of a minimal CREATE EVENT statement: CREATE EVENT myevent ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 HOUR DO UPDATE myschema.mytable SET mycol = mycol + 1; The previous statement creates an event named myevent. This event ...
https://dev.mysql.com/doc/refman/8.0/en/cast-functions.html
Table 14.15 Cast Functions and Operators Name Description Deprecated BINARY Cast a string to a binary string 8.0.27 CAST() Cast a value as a certain type CONVERT() Cast a value as a certain type Cast functions and operators enable conversion of ...