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https://dev.mysql.com/doc/refman/5.7/en/group-replication-status-variables.html
If the group is operating in multi-primary mode, shows an empty string. MySQL 5.7 supports one status variable providing information about Group Replication. This variable is described here: group_replication_primary_member Shows the primary ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-optimizer-trace-table.html
MISSING_BYTES_BEYOND_MAX_MEM_SIZE Each remembered trace is a string that is extended as optimization progresses and appends data to it. The OPTIMIZER_TRACE table provides information produced by the optimizer tracing capability for traced ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-init-startup-configuration.html
(The MySQL server changes its current working directory to the data directory when it begins executing.) If you specify innodb_data_home_dir as an empty string, you can specify absolute paths for data files listed in the innodb_data_file_path value.
https://dev.mysql.com/doc/refman/5.7/en/replication-channels.html
To provide compatibility with previous versions, the MySQL server automatically creates on startup a default channel whose name is the empty string (""). In MySQL multi-source replication, a replica opens multiple replication channels, one for each ...
https://dev.mysql.com/doc/refman/5.7/en/replication-options-reference.html
Set to empty string to disallow type conversions between source and replica. The following two sections provide basic information about the MySQL command-line options and system variables applicable to replication and the binary log. Replication ...
https://dev.mysql.com/doc/refman/5.7/en/charset-connection.html
Exception: For string literals that have an introducer such as _utf8mb4 or _latin2, the introducer determines the character set. For comparisons of strings with column values, collation_connection does not matter because columns have their own ... A ...
https://dev.mysql.com/doc/refman/5.7/en/explain.html
In this case, the statement displays output only for the columns with names matching the string. There is no need to enclose the string within quotation marks unless it contains spaces or other special characters. In practice, the DESCRIBE keyword ...
https://dev.mysql.com/doc/refman/5.7/en/server-status-variable-reference.html
The following table lists all status variables applicable within mysqld. The last column indicates whether the scope for each variable is Global, Session, or both. Please see the corresponding item descriptions for details on setting and using the ...
https://dev.mysql.com/doc/refman/5.7/en/account-activity-auditing.html
To extract the user name or host name part from a CURRENT_USER() or USER() value, use the SUBSTRING_INDEX() function: mysql> SELECT SUBSTRING_INDEX(CURRENT_USER(),'@',1); +---------------------------------------+ | ... Applications can use the ...
https://dev.mysql.com/doc/refman/5.7/en/added-deprecated-removed.html
Options and Variables Introduced in MySQL 5.7 Options and Variables Deprecated in MySQL 5.7 Options and Variables Removed in MySQL 5.7 This section lists server variables, status variables, and options that were added for the first time, have been ...