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https://dev.mysql.com/doc/refman/5.7/en/merge-storage-engine.html
The column of the underlying table and the MERGE table can be NULL. The MERGE storage engine, also known as the MRG_MyISAM engine, is a collection of identical MyISAM tables that can be used as one. “Identical” means that all tables have ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-upgrade.html
--debug[=debug_options], -# [debug_options] Command-Line Format --debug[=#] Type String Default Value d:t:O,/tmp/mysql_upgrade.trace Write a debugging log. --default-auth=plugin Command-Line Format --default-auth=plugin Type String A hint about ...
https://dev.mysql.com/doc/refman/5.7/en/selecting-all.html
For example, you may happen to think that the birth date for Bowser does not seem quite right. Consulting your original pedigree papers, you find that the correct birth year should be 1989, not 1979. Fix only the erroneous record with an UPDATE ...
https://dev.mysql.com/doc/refman/5.7/en/source-configuration-options.html
The CMake program provides a great deal of control over how you configure a MySQL source distribution. Typically, you do this using options on the CMake command line. For information about options supported by CMake, run either of these commands in ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-config-editor.html
To see a command-specific help message, invoke mysql_config_editor as follows, where command is a command other than help: mysql_config_editor command --help --debug[=debug_options], -# debug_options Command-Line Format --debug[=debug_options] Type ... The mysql_config_editor utility enables you to store authentication credentials in an obfuscated login path file named ...
https://dev.mysql.com/doc/refman/5.7/en/insert.html
For example, inserting the string '1999.0e-2' into an INT, FLOAT, DECIMAL(10,6), or YEAR column inserts the value 1999, 19.9921, 19.992100, or 1999, respectively. The value stored in the INT and YEAR columns is 1999 because the string-to-number ...
https://dev.mysql.com/doc/refman/5.7/en/dbug-package.html
Here are some example debug control strings as they might be specified on a shell command line: --debug=d:t --debug=d:f,main,subr1:F:L:t,20 --debug=d,input,output,files:n --debug=d:t:i:O,\\mysqld.trace For mysqld, it is also possible to change DBUG ... The MySQL server and most MySQL clients are compiled with the DBUG package originally created by Fred ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-replication-applier-status-by-coordinator-table.html
An error number of 0 and message which is an empty string means “no error”. For a multithreaded replica, the replica uses multiple worker threads and a coordinator thread to manage them, and this table shows the status of the coordinator thread. For a multithreaded replica, the replication_applier_status_by_worker table shows the status of the worker ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-replication-connection-status-table.html
An error number of 0 and message of the empty string mean “no error.” If the LAST_ERROR_MESSAGE value is not empty, the error values also appear in the replica's error log. This table shows the current status of the replication I/O thread that ...
https://dev.mysql.com/doc/refman/5.7/en/replication-mode-change-online-disable-gtids.html
This section describes how to disable GTID transactions on servers that are already online. This procedure does not require taking the server offline and is suited to use in production. However, if you have the possibility to take the servers ...