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https://dev.mysql.com/doc/refman/8.0/en/innodb-standard-monitor.html
Contention can be due to heavy parallelism of queries or problems in operating system thread scheduling. You can calculate from these numbers how many data file I/O operations your queries currently are doing. The Lock Monitor is the same as the ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-install-example-data.html
Running SELECT queries on the SQL node is no different from running them on any other instance of a MySQL server. To run queries from the command line, you first need to log in to the MySQL Monitor in the usual way (specify the root password at the ... Note The information in this section applies to NDB Cluster running on both Unix and Windows ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-shell-tutorial-javascript-documents-find.html
Avoid introducing values in queries using string concatenation, which can produce invalid input and, in some cases, can cause security issues. You can use the find() method to query for and return documents from a collection in a schema. MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-shell-tutorial-python-documents-find.html
Avoid introducing values in queries using string concatenation, which can produce invalid input and, in some cases, can cause security issues. You can use the find() method to query for and return documents from a collection in a schema. MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-events-waits-current-table.html
The table stores one row per thread showing the current status of the thread's most recent monitored wait event, so there is no system variable for configuring the table size. Of the tables that contain wait event rows, events_waits_current is the ...
https://dev.mysql.com/doc/refman/8.0/en/show-warnings.html
SHOW WARNINGS [LIMIT [offset,] row_count] SHOW COUNT(*) WARNINGS SHOW WARNINGS is a diagnostic statement that displays information about the conditions (errors, warnings, and notes) resulting from executing a statement in the current session.
https://dev.mysql.com/doc/refman/8.0/en/spatial-relation-functions-mbr.html
MySQL provides several MySQL-specific functions that test the relationship between minimum bounding rectangles (MBRs) of two geometries g1 and g2. The return values 1 and 0 indicate true and false, respectively. The bounding box of a point is ...
https://dev.mysql.com/doc/refman/8.0/en/subquery-restrictions.html
Prior to MySQL 8.0.14, subqueries in the FROM clause cannot be correlated subqueries. MySQL does not support LIMIT in subqueries for certain subquery operators: mysql> SELECT * FROM t1 WHERE s1 IN (SELECT s2 FROM t2 ORDER BY s1 LIMIT 1); ERROR 1235 ... In general, you cannot modify a table and select from the same table in a ...
https://dev.mysql.com/doc/refman/8.0/en/window-function-optimization.html
Semijoins are not applicable to window function optimization because semijoins apply to subqueries in WHERE and JOIN ... The default is to avoid inverse aggregation, which is slower but preserves precision. Window functions affect the strategies ...
https://dev.mysql.com/doc/refman/8.0/en/window-functions-named-windows.html
Windows can be defined and given names by which to refer to them in OVER clauses. If present in a query, the WINDOW clause falls between the positions of the HAVING and ORDER BY clauses, and has this syntax: WINDOW window_name AS (window_spec) [, ...