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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 ...
https://dev.mysql.com/doc/refman/5.7/en/help.html
HELP 'search_string' The HELP statement returns online information from the MySQL Reference Manual. The HELP statement searches the help tables for the given search string and displays the result of the search. The search string can contain the ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-consistent-read.html
A consistent read means that InnoDB uses multi-versioning to present to a query a snapshot of the database at a point in time. The query sees the changes made by transactions that committed before that point in time, and no changes made by later or ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-undo-tablespaces.html
The purge system empties rollback segments by freeing undo logs that are no longer in use. Undo tablespaces contain undo logs, which are collections of records containing information about how to undo the latest change by a transaction to a ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-option-tables.html
ndb-connectstring: Address of NDB management server distributing configuration information for this cluster. ndb_version_string: Shows build information including NDB engine version in ndb-x.y.z format. The following list includes command-line ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-security-mysql-privileges.html
If these conditions are true, then anyone, anywhere can start a MySQL Server with --ndbcluster --ndb-connectstring=management_host and access this NDB Cluster. In this section, we discuss how the MySQL privilege system works in relation to NDB ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-memory-model.html
Memory used depends on the load actually seen, not the load estimated or explicitly configured for. As the Performance Schema collects data, memory is allocated in the corresponding buffer. The buffer size is unbounded, and may grow with the load.
https://dev.mysql.com/doc/refman/5.7/en/replication-multi-source-provision-replica.html
If the sources in the multi-source replication topology have existing data, it can save time to provision the replica with the relevant data before starting replication. In a multi-source replication topology, copying the data directory cannot be ...
https://dev.mysql.com/doc/refman/5.7/en/spatial-function-argument-handling.html
Spatial values, or geometries, have the properties described in Section 11.4.2.2, “Geometry Class”. Specific functions or groups of functions may have additional or different argument-handling characteristics, as discussed in the sections where ...