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https://dev.mysql.com/doc/refman/5.7/en/open.html
OPEN cursor_name This statement opens a previously declared cursor. For an example, see Section 13.6.6, “Cursors”. ...
https://dev.mysql.com/doc/refman/5.7/en/optimize-multi-tables.html
Some techniques for keeping individual queries fast involve splitting data across many tables. When the number of tables runs into the thousands or even millions, the overhead of dealing with all these tables becomes a new performance consideration.
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-file-instances-table.html
The file_instances table lists all the files seen by the Performance Schema when executing file I/O instrumentation. If a file on disk has never been opened, it is not in file_instances. When a file is deleted from the disk, it is also removed from ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-floatvalues.html
This is true for operations that use floating-point values explicitly, or that use values that are converted to floating-point implicitly. Comparisons of floating-point values might yield different results on source and replica servers due to ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-truncate.html
TRUNCATE TABLE is normally regarded as a DML statement, and so would be expected to be logged and replicated using row-based format when the binary logging mode is ROW or MIXED. TRUNCATE TABLE is treated for purposes of logging and replication as ...However this caused issues when logging or replicating, in STATEMENT or MIXED mode, tables that used transactional storage engines such as InnoDB when the transaction isolation level was READ COMMITTED or READ UNCOMMITTED, which precludes statement-based ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-views.html
Care should therefore be taken to ensure that views do not replicate table data that would normally be filtered for security reasons. Views are filtered by their own name, not by the tables they refer to. This means that a view can be replicated to ...
https://dev.mysql.com/doc/refman/5.7/en/replication-statements-group.html
This section provides information about the statements used to control servers running the MySQL Group Replication plugin.
https://dev.mysql.com/doc/refman/5.7/en/resolve-stack-dump.html
Stack traces from official MySQL builds are always symbolized, so there is no need to use resolve_stack_dump. Invoke resolve_stack_dump like this: resolve_stack_dump [options] symbols_file [numeric_dump_file] The symbols file should include the ...
https://dev.mysql.com/doc/refman/5.7/en/retrieving-data.html
The SELECT statement is used to pull information from a table. The general form of the statement is: SELECT what_to_select FROM which_table WHERE conditions_to_satisfy; what_to_select indicates what you want to see. If it is present, ...This can be ...
https://dev.mysql.com/doc/refman/5.7/en/se-csv-limitations.html
Partitioning is not supported for tables using the CSV storage engine. All tables that you create using the CSV storage engine must have the NOT NULL attribute on all columns.