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https://dev.mysql.com/doc/refman/8.4/en/group-replication-online-upgrade-combining-versions.html
Group Replication is versioned according to the MySQL Server version that the Group Replication plugin was bundled with. For example, if a member is running MySQL 8.4.6 then that is the version of the Group Replication plugin. For optimal ...
https://dev.mysql.com/doc/refman/8.4/en/help.html
URL: https://dev.mysql.com/doc/refman/8.4/en/mathematical-functions.html Examples: mysql> SELECT LOG(2); -> 0.69314718055995 mysql> SELECT LOG(-2); -> NULL List of topics. HELP 'search_string' The HELP statement returns online information from the ...
https://dev.mysql.com/doc/refman/8.4/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. This table can be examined using SELECT statements, which may help you diagnose the causes of connection problems.
https://dev.mysql.com/doc/refman/8.4/en/identifier-case-sensitivity.html
The following statement would not work because it refers to a table both as my_table and as MY_TABLE: mysql> SELECT * FROM my_table WHERE MY_TABLE.col=1; Partition, subpartition, column, index, stored routine, event, and resource group names are not ... In MySQL, databases correspond to directories within the data ...
https://dev.mysql.com/doc/refman/8.4/en/implicit-commit.html
SELECT causes an implicit commit before and after the statement is executed when you are creating nontemporary tables. SELECT.) Statements that implicitly use or modify tables in the mysql database. The statements listed in this section (and any ...
https://dev.mysql.com/doc/refman/8.4/en/index-page-merge-threshold.html
For example: mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_INDEXES WHERE NAME='id_index' \G *************************** 1. If the “page-full” percentage for an index page falls below the MERGE_THRESHOLD value when a row is deleted or when a row ...
https://dev.mysql.com/doc/refman/8.4/en/information-schema-column-privileges-table.html
In the output from SHOW FULL COLUMNS, the privileges are all in one column and in lowercase, for example, select,insert,update,references. The COLUMN_PRIVILEGES table has these columns: GRANTEE The name of the account to which the privilege is ...
https://dev.mysql.com/doc/refman/8.4/en/information-schema-columns-table.html
Unlike SHOW COLUMNS, SELECT from the COLUMNS table does not have automatic ordering. The following statements are nearly equivalent: SELECT COLUMN_NAME, DATA_TYPE, IS_NULLABLE, COLUMN_DEFAULT FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name = ...The ...
https://dev.mysql.com/doc/refman/8.4/en/information-schema-innodb-cached-indexes-table.html
Examples This query returns the number of index pages cached in the InnoDB buffer pool for a specific index: mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_CACHED_INDEXES WHERE INDEX_ID=65\G *************************** 1. SELECT tables.NAME AS ...
https://dev.mysql.com/doc/refman/8.4/en/information-schema-innodb-tablespaces-table.html
The undo tablespace was either selected by the purge thread implicitly or was made inactive by an ALTER UNDO TABLESPACE ... Example mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_TABLESPACES WHERE SPACE = 26\G *************************** 1. The ...