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https://dev.mysql.com/doc/refman/5.7/en/option-defaults-equals.html
Options having default values always require an equal sign when assigning a value; failing to do so causes an error. For example, the MySQL server --log-error option has the default value host_name.err, where host_name is the name of the host on ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-nodes.html
Notes The uptime column shows the time in seconds that this node has been running since it was last started or restarted. For each data node that is running in the cluster, a corresponding row in this table provides the node's node ID, status, and ... This table contains information on the status of data ...
https://dev.mysql.com/doc/refman/5.7/en/optimization.html
Sometimes you can be proactive and plan in advance for performance, while other times you might troubleshoot a configuration or code issue after a problem occurs. This chapter explains how to optimize MySQL performance and provides examples.
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-session-account-connect-attrs-table.html
Application programs can provide key-value connection attributes to be passed to the server at connect time. For descriptions of common attributes, see Section 25.12.9, “Performance Schema Connection Attribute Tables”. The ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-session-connect-attrs-table.html
Application programs can provide key-value connection attributes to be passed to the server at connect time. For descriptions of common attributes, see Section 25.12.9, “Performance Schema Connection Attribute Tables”. To see connection ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-setup-consumers-table.html
If you disable a consumer, the server does not spend time adding event information to it. For detailed information about the effect of enabling different consumers, see Section 25.4.7, “Pre-Filtering by Consumer”.
https://dev.mysql.com/doc/refman/5.7/en/sys-ps-thread-stack.html
row *************************** thread_stack: {"rankdir": "LR","nodesep": "0.10", "stack_created": "2014-02-19 13:39:03", "mysql_version": "5.7.3-m13", "mysql_user": "root@localhost","events": [{"nesting_event_id": "0", "event_id": "10", ... Returns ...
https://dev.mysql.com/doc/refman/5.7/en/replication-bugs.html
When you have determined that there is no user error involved, and replication still either does not work at all or is unstable, it is time to send us a bug report. Please spend some time and effort in preparing a good bug report. If you have a ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-performance-thread_concurrency.html
In situations where it is helpful to minimize context switching between threads, InnoDB can use a number of techniques to limit the number of concurrently executing operating system threads (and thus the number of requests that are processed at any ...Scalability improvements in MySQL 5.5 and up reduce the need to limit the number of concurrently executing threads inside ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-compression-tables.html
There are two pairs of InnoDB INFORMATION_SCHEMA tables about compression that can provide insight into how well compression is working overall: INNODB_CMP and INNODB_CMP_RESET provide information about the number of compression operations and the ...INNODB_CMPMEM and INNODB_CMPMEM_RESET provide information about the way memory is allocated for ...