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https://dev.mysql.com/doc/refman/8.0/en/drop-tablespace.html
mysql> DROP UNDO TABLESPACE undo_003; NDB Example This example shows how to drop an NDB tablespace myts having a data file named mydata-1.dat after first creating the tablespace, and assumes the existence of a log file group named mylg (see Section ... DROP [UNDO] TABLESPACE tablespace_name [ENGINE [=] engine_name] This statement drops a tablespace that was previously created using CREATE ...
https://dev.mysql.com/doc/refman/8.0/en/dynamic-system-variables.html
Many server system variables are dynamic and can be set at runtime. Please see the corresponding item descriptions for details on setting and using the variables. For a description of the privilege requirements for setting system variables, see ...
https://dev.mysql.com/doc/refman/8.0/en/end-markers-in-json-system-variable.html
When reading a very large JSON document, it can be difficult to pair its closing bracket and opening brackets; setting end_markers_in_json=ON repeats the structure's key, if it has one, near the closing bracket. This variable affects both optimizer ...
https://dev.mysql.com/doc/refman/8.0/en/event-scheduler-thread-states.html
Clearing The scheduler thread or a thread that was executing an event is terminating and is about to end. Waiting for scheduler to stop The thread issued SET GLOBAL event_scheduler=OFF and is waiting for the scheduler to stop. Waiting on empty queue ... These states occur for the Event Scheduler thread, threads that are created to execute scheduled events, or threads that terminate the ...
https://dev.mysql.com/doc/refman/8.0/en/example-maximum-column-group-row.html
Task: For each article, find the dealer or dealers with the most expensive price. Other possibilities for solving the problem are to use an uncorrelated subquery in the FROM clause, a LEFT JOIN, or a common table expression with a window function.
https://dev.mysql.com/doc/refman/8.0/en/execution-plan-information.html
Depending on the details of your tables, columns, indexes, and the conditions in your WHERE clause, the MySQL optimizer considers many techniques to efficiently perform the lookups involved in an SQL query. Your goals are to recognize the aspects ...A query on a huge table can be performed without reading all the rows; a join involving several tables can be performed without comparing every combination of ...
https://dev.mysql.com/doc/refman/8.0/en/faqs-connectors-apis.html
For common questions, issues, and answers relating to the MySQL Connectors and other APIs, see the following areas of the Manual: Using C API Features Connector/ODBC Notes and Tips Connector/NET Programming MySQL Connector/J Developer Guide .
https://dev.mysql.com/doc/refman/8.0/en/federated-create.html
You can either create the local table and specify the connection string (containing the server name, login, password) to be used to connect to the remote table using the CONNECTION, or you can use an existing connection that you have previously ...
https://dev.mysql.com/doc/refman/8.0/en/general-security-issues.html
This section describes general security issues to be aware of and what you can do to make your MySQL installation more secure against attack or misuse. For information specifically about the access control system that MySQL uses for setting up user ...For answers to some questions that are often asked about MySQL Server security issues, see Section A.9, “MySQL 8.0 FAQ: ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-replication-technologies.html
Before getting into the details of MySQL Group Replication, this section introduces some background concepts and an overview of how things work. This provides some context to help understand what is required for Group Replication and what the ...