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https://dev.mysql.com/doc/refman/9.7/en/mysql-cluster-install-windows-initial-start.html
(For more information, see Section 25.3.2.4, “Installing NDB Cluster Processes as Windows Services”.) Do not start the SQL node yet; it cannot connect to the cluster until the data nodes have finished starting, which may take some time. You can ... Once the NDB Cluster executables and needed configuration files are in place, performing an initial start of the cluster is simply a matter of starting the NDB Cluster executables for all nodes in the ...
https://dev.mysql.com/doc/refman/9.7/en/mysql-cluster-replication-issues.html
A loss of connection can occur either between the source cluster SQL node and the replica cluster SQL node, or between the source SQL node and the data nodes of the source cluster. The source SQL node issues a “gap” event when connecting or ...
https://dev.mysql.com/doc/refman/9.7/en/mysql-cluster-single-user-mode.html
When entering single user mode, connections to all other API nodes are closed gracefully and all running transactions are aborted. Note When the preceding command is invoked, all transactions running on the designated node are aborted, the ...
https://dev.mysql.com/doc/refman/9.7/en/mysql-cluster-sql-statements.html
This section discusses several SQL statements that can prove useful in managing and monitoring a MySQL server that is connected to an NDB Cluster, and in some cases provide information about the cluster itself. SHOW ENGINE NDB STATUS, SHOW ENGINE ...See Section 15.7.7.17, “SHOW ENGINE Statement”, for a usage example and more detailed ...
https://dev.mysql.com/doc/refman/9.7/en/option-tracker-component-supported-components.html
To be shown in the mysql_option.option_usage and mysql_option tables, a component or plugin must be written and compiled with support for the Option Tracker. The name of the Option Tracker status variable (usage counter) associated with this ...
https://dev.mysql.com/doc/refman/9.7/en/password-logging.html
Replicas store the password for the replication source server in their connection metadata repository, which by default is a table in the mysql database named slave_master_info. The use of a file in the data directory for the connection metadata ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-instrument-naming.html
For example, the statement/com/Connect and statement/com/Init DB instruments correspond to the COM_CONNECT and COM_INIT_DB commands. The instruments associated with listening sockets for TCP/IP or Unix socket file connections have a socket_type ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-setup-instruments-table.html
For example, the wait/synch/mutex/sql/THD::LOCK_query_plan mutex is created each time a session connects, and destroyed when the session disconnects. Due to constraints on name lengths with respect to potentially large numbers of connections, ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-tp-thread-group-state-table.html
CONNECT_THREAD_COUNT The number of threads that are processing or waiting to process connection initialization and authentication. There can be a maximum of four connection threads per thread group; these threads expire after a period of inactivity.
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-wait-summary-tables.html
For example, if there is an instrument for a mutex that is created for each connection, there are as many instances as there are connections. For summary tables aggregated by account, host, or user, truncation removes rows for accounts, hosts, or ...