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https://dev.mysql.com/doc/refman/5.7/en/channels-commands-single-channel.html
To enable MySQL replication operations to act on individual replication channels, use the FOR CHANNEL channel clause with the following replication statements: CHANGE MASTER TO START SLAVE STOP SLAVE SHOW RELAYLOG EVENTS FLUSH RELAY LOGS SHOW SLAVE ...
https://dev.mysql.com/doc/refman/5.7/en/choosing-types.html
For optimum storage, you should try to use the most precise type in all cases. For example, if an integer column is used for values in the range from 1 to 99999, MEDIUMINT UNSIGNED is the best type. For high precision, you can always convert to a ...Of the types that represent all the required values, this type uses the least amount of ...
https://dev.mysql.com/doc/refman/5.7/en/geometry-well-formedness-validity.html
For geometry values, MySQL distinguishes between the concepts of syntactically well-formed and geometrically valid. Spatial import functions that parse WKT or WKB values raise an error for attempts to create a geometry that is not syntactically ...
https://dev.mysql.com/doc/refman/5.7/en/group-replication-failure-detection.html
Group Replication’s failure detection mechanism is a distributed service which is able to identify that a server in the group is not communicating with the others, and is therefore suspected of being out of service. If a member is not ...If the ...
https://dev.mysql.com/doc/refman/5.7/en/index-preloading.html
If there are enough blocks in a key cache to hold blocks of an entire index, or at least the blocks corresponding to its nonleaf nodes, it makes sense to preload the key cache with index blocks before starting to use it. Although the blocks stay in ...Preloading enables you to put the table index blocks into a key cache buffer in the most efficient way: by reading the index blocks from disk ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-configuration.html
The default behavior is to look for the management node on localhost. Before the NDB storage engine can be used, at least one management node must be operational, as well as any desired data nodes. For more information about --ndbcluster and other ... A MySQL server that is part of an NDB Cluster differs in one chief respect from a normal (nonclustered) MySQL server, in that it employs the NDB storage ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-install-windows-service.html
The --install option must be used first, ahead of any other options that might be specified for ndb_mgmd.exe. Installation of an NDB Cluster data node process as a Windows service can be done in a similar fashion, using the --install option for ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-install-windows.html
This section describes installation procedures for NDB Cluster on Windows hosts. NDB Cluster 7.5 and 7.6 binaries for Windows can be obtained from https://dev.mysql.com/downloads/cluster/. For information about installing NDB Cluster on Windows ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-log-startup-messages.html
Possible startup messages with descriptions are provided in the following list: Initial start, waiting for %s to connect, nodes [ all: %s connected: %s no-wait: %s ] Waiting until nodes: %s connects, nodes [ all: %s connected: %s no-wait: %s ] ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-cond-instances-table.html
The cond_instances table lists all the conditions seen by the Performance Schema while the server executes. A condition is a synchronization mechanism used in the code to signal that a specific event has happened, so that a thread waiting for this ...The cond_instances table has these columns: NAME The instrument name associated with the ...