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https://dev.mysql.com/doc/refman/5.7/en/dbug-package.html
Here are some example debug control strings as they might be specified on a shell command line: --debug=d:t --debug=d:f,main,subr1:F:L:t,20 --debug=d,input,output,files:n --debug=d:t:i:O,\\mysqld.trace For mysqld, it is also possible to change DBUG ... The MySQL server and most MySQL clients are compiled with the DBUG package originally created by Fred ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-replication-applier-status-by-coordinator-table.html
An error number of 0 and message which is an empty string means “no error”. For a multithreaded replica, the replica uses multiple worker threads and a coordinator thread to manage them, and this table shows the status of the coordinator thread. For a multithreaded replica, the replication_applier_status_by_worker table shows the status of the worker ...
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/mysql-cluster-limitations-transactions.html
A number of limitations exist in NDB Cluster with regard to the handling of transactions. The NDBCLUSTER storage engine supports only the READ COMMITTED transaction isolation level. To ensure that a given transaction reads only before or after ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-replication-tables.html
At this time, there are no active replica threads, so the THREAD_ID columns are NULL and the SERVICE_STATE columns have a value of OFF. After STOP SLAVE, the THREAD_ID columns become NULL and the SERVICE_STATE columns for threads that no longer ...
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 ...