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https://dev.mysql.com/doc/refman/8.0/en/show-warnings.html
SHOW WARNINGS [LIMIT [offset,] row_count] SHOW COUNT(*) WARNINGS SHOW WARNINGS is a diagnostic statement that displays information about the conditions (errors, warnings, and notes) resulting from executing a statement in the current session. If ...
https://dev.mysql.com/doc/refman/8.0/en/bnl-bka-optimization.html
In the example just given, the buffer B1 used to join tables t1 and t2 must be a regular buffer. Then the BKA algorithm builds keys to access the table to be joined for all rows in the buffer and submits these keys in a batch to the database engine ... In MySQL, a Batched Key Access (BKA) Join algorithm is available that uses both index access to the joined table and a join ...
https://dev.mysql.com/doc/refman/8.0/en/server-configuration-defaults.html
For non-Windows platforms, no default option file is created during either the server installation or the data directory initialization process. The MySQL server has many operating parameters, which you can change at server startup using ...To ...
https://dev.mysql.com/doc/refman/8.0/en/csv-storage-engine.html
The CSV storage engine stores data in text files using comma-separated values format. When you create a CSV table, the server creates a plain text data file having a name that begins with the table name and has a .CSV extension. When you store data ...The name of this file is the same as the name of the table with the extension ...
https://dev.mysql.com/doc/refman/8.0/en/macos-installation-notes.html
Removing: After you have copied over the MySQL database files from the previous installation and have successfully started the new server, you should consider removing the old installation files to save disk space. Users: You may need (or want) to ... You should keep the following issues and notes in mind: Other MySQL installations: The installation procedure does not recognize MySQL installations by package managers such as ...
https://dev.mysql.com/doc/refman/8.0/en/problems-with-null.html
To load a NULL value into a column, use \N in the data file. The following statement returns no rows, because expr = NULL is never true for any expression: mysql> SELECT * FROM my_table WHERE phone = NULL; To look for NULL values, you must use the ... The concept of the NULL value is a common source of confusion for newcomers to SQL, who often think that NULL is the same thing as an empty string ...
https://dev.mysql.com/doc/refman/8.0/en/enum.html
The ENUM type has these advantages: Compact data storage in situations where a column has a limited set of possible values. See Section 13.7, “Data Type Storage Requirements” for storage requirements for the ENUM type. The index value of the ...
https://dev.mysql.com/doc/refman/8.0/en/network-namespace-support.html
They must be invoked from within the network namespace of the server to which they are to connect.) Regular replication. The following sections describe how to use network namespaces in MySQL: Host System Prerequisites MySQL Configuration Network ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-replication-mta.html
For this to be true, the binlog_transaction_dependency_tracking server system variable must be set to WRITESET on the source. MTA Configuration: Source Source mysqld configuration for the NDB MTA must include the following explicit settings: ...To ...Where dependencies cannot be efficiently determined, mysqld falls back to considering transactions dependent for reasons of ...
https://dev.mysql.com/doc/refman/8.0/en/features.html
This section describes some of the important characteristics of the MySQL Database Software. You can refer to tables from different databases in the same statement. The maximum index width for InnoDB tables is either 767 bytes or 3072 bytes. The ...