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https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html
mysql> SELECT CONVERT_TZ('2004-01-01 12:00:00','GMT','MET'); -> '2004-01-01 13:00:00' mysql> SELECT CONVERT_TZ('2004-01-01 12:00:00','+00:00','+10:00'); -> '2004-01-01 22:00:00' Note To use named time zones such as 'MET' or 'Europe/Amsterdam', the ... This section describes the functions that can be used to manipulate temporal ...
https://dev.mysql.com/doc/refman/8.0/en/descending-indexes.html
For InnoDB full-text search, this means that the index required on the FTS_DOC_ID column of the indexed table cannot be defined as a descending index. MySQL supports descending indexes: DESC in an index definition is no longer ignored but causes ...
https://dev.mysql.com/doc/refman/8.0/en/environment-variables.html
This section lists environment variables that are used directly or indirectly by MySQL. Most of these can also be found in other places in this manual. Options on the command line take precedence over values specified in option files and ...
https://dev.mysql.com/doc/refman/8.0/en/error-log-components.html
A sink may also write to the Performance Schema error_log table; see Section 29.12.21.2, “The error_log Table”. For a sink component, whether it supports an interface to the Performance Schema error_log table. This section describes the ...
https://dev.mysql.com/doc/refman/8.0/en/faqs-information-schema.html
Can I add to or otherwise modify the tables found in the INFORMATION_SCHEMA database? A.7.1. Where can I find documentation for the MySQL INFORMATION_SCHEMA database? See Chapter 28, INFORMATION_SCHEMA Tables. What is the difference between the ...
https://dev.mysql.com/doc/refman/8.0/en/foreign-key-optimization.html
If a table has many columns, and you query many different combinations of columns, it might be efficient to split the less-frequently used data into separate tables with a few columns each, and relate them back to the main table by duplicating the ...Depending on how the data is distributed, the queries might perform less I/O and take up less cache memory because the relevant columns are packed together on ...
https://dev.mysql.com/doc/refman/8.0/en/fulltext-boolean.html
InnoDB tables require a FULLTEXT index on all columns of the MATCH() expression to perform boolean queries. The stopword list applies, controlled by innodb_ft_enable_stopword, innodb_ft_server_stopword_table, and innodb_ft_user_stopword_table for ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-configuring-instances.html
For more information, see Section 6.4.5, “mysql_upgrade — Check and Upgrade MySQL Tables”. log_bin=binlog log_slave_updates=ON binlog_format=ROW master_info_repository=TABLE relay_log_info_repository=TABLE ... This section explains the ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-enterprise-backup.html
This is because the backup_progress table on the server is a CSV table, for which primary keys are not supported. Add a PK to the table or unset this variable to avoid this message. Note that tables without PK can cause performance problems in ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-index-types.html
Each InnoDB table has a special index called the clustered index that stores row data. When you define a PRIMARY KEY on a table, InnoDB uses it as the clustered index. If you do not define a PRIMARY KEY for a table, InnoDB uses the first UNIQUE ...