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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-connection-tables.html
When a client connects to the MySQL server, it does so under a particular user name and from a particular host. They differ in that, for grant tables, the host part of an account can be a pattern, whereas for Performance Schema tables, the host ...
https://dev.mysql.com/doc/refman/8.0/en/replication-multi-source-monitoring.html
The error codes and messages that are issued when multi-source replication is enabled specify the channel that generated the error. row *************************** CHANNEL_NAME: source_1 GROUP_NAME: SOURCE_UUID: 046e41f8-a223-11e4-a975-0811960cc264 ... To monitor the status of replication channels the following options exist: Using the replication Performance Schema ...
https://dev.mysql.com/doc/refman/8.0/en/replication-rules.html
On the source, you can control which databases to log changes for by using the --binlog-do-db and --binlog-ignore-db options to control binary logging. For a description of the rules that servers use in evaluating these options, see Section ... If a ...To make it easier to determine what effect a given set of options has, it is recommended that you avoid mixing do-* and ignore-* options, or options containing wildcards with options which do ...
https://dev.mysql.com/doc/refman/8.0/en/replication-solutions-scaleout.html
You can use replication as a scale-out solution; that is, where you want to split up the load of database queries across multiple database servers, within some reasonable limitations. Figure 19.1 Using Replication to Improve Performance During ...
https://dev.mysql.com/doc/refman/8.0/en/replication-threads-monitor-worker.html
A multithreaded replica's coordinator thread also prints statistics to the replica's error log on a regular basis if the verbosity setting is set to display informational messages. The message lists the following statistics for the relevant ... On a ...
https://dev.mysql.com/doc/refman/8.0/en/version-tokens-elements.html
Otherwise, the plugin returns an error to the client and the statement fails. If the server has a different state when a client sends a statement, the client receives an error. Version Tokens is based on a plugin library that implements these ...
https://dev.mysql.com/doc/refman/8.0/en/view-check-option.html
The WITH CHECK OPTION clause can be given for an updatable view to prevent inserts to rows for which the WHERE clause in the select_statement is not true. In a WITH CHECK OPTION clause for an updatable view, the LOCAL and CASCADED keywords ...It ...
https://dev.mysql.com/doc/refman/8.0/en/all-subqueries.html
The expression is TRUE if table t2 contains (-5,0,+5) because 10 is greater than all three values in t2. The expression is FALSE if table t2 contains (12,6,NULL,-100) because there is a single value 12 in table t2 that is greater than 10. The ...
https://dev.mysql.com/doc/refman/8.0/en/alter-view.html
ALTER [ALGORITHM = {UNDEFINED | MERGE | TEMPTABLE}] [DEFINER = user] [SQL SECURITY { DEFINER | INVOKER }] VIEW view_name [(column_list)] AS select_statement [WITH [CASCADED | LOCAL] CHECK OPTION] This statement changes the definition of a view, ...
https://dev.mysql.com/doc/refman/8.0/en/ansi-diff-comments.html
MySQL Server supports a variant of the -- comment style; the -- start-comment sequence is accepted as such, but must be followed by a whitespace character such as a space or newline. Standard SQL uses the C syntax /* this is a comment */ for ...