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https://dev.mysql.com/doc/refman/8.4/en/subquery-optimization-with-exists.html
This is a problem because many real world subqueries become very slow unless the equality can be pushed down. For multiple-table subqueries, execution of NULL IN (SELECT ...) is particularly slow because the join optimizer does not optimize for the ...WHERE subquery_where) MySQL evaluates queries “from outside to inside.” That is, it first obtains the value of the outer expression outer_expr, and then runs the subquery and captures the rows that it ...
https://dev.mysql.com/doc/workbench/en/wb-mysql-connections-navigator-instance-server-logs.html
For each connection, the Administration - Server Logs tab includes additional tabs for the general error logs and the slow logs (if available). Figure 6.2 Navigator Administration: Instance: Server Logs: Error Log Slow Log File The next figure shows ... The Administration - Server Logs tab displays log information for the MySQL server represented by each connection ...
https://dev.mysql.com/doc/mysql-monitor/8.0/en/mem-qanal-config-ui.html
Figure 32.8 Graph View Filter View Figure 32.9 Filter View The following are the possible filter options: Column: enables you to filter the queries based on specific values within any of the columns shown in the Query Analyzer report list. For ...
https://dev.mysql.com/doc/heatwave/en/mys-hw-query-priority-queue.html
MySQL HeatWave uses a workload-aware, priority-based, automated scheduling mechanism to schedule concurrently issued queries for execution. The scheduling mechanism prioritizes short-running queries but considers wait time in the queue so that ...
https://dev.mysql.com/doc/ndbapi/en/mccj-clusterj-_query.html
A Query instance represents a specific query with bound parameters. Table 4.37 deletePersistentAll() Parameter Description return the number of instances deleted 4.3.1.19.9 execute(Map<String, ?>) public abstract Results<E> execute(Map<String, ?> ...
https://dev.mysql.com/doc/heatwave/en/mys-hw-rpd-query-stats-table.html
For MySQL HeatWave AutoML routines that include multiple sub-queries, such as ML_TRAIN, a new record is used for each query. Includes prepart data, which can be queried to determine if a JOIN or GROUP BY query used data placement partitions. The ...
https://dev.mysql.com/doc/refman/8.4/en/mysqldump.html
Use this option if you want to increase the time allowed for queries from mysqldump before they are logged to the slow query log file. With large data sizes, even if the backup step takes a reasonable time, restoring the data can be very slow ...
https://dev.mysql.com/doc/refman/8.4/en/mysqladmin.html
Slow queries The number of queries that have taken more than long_query_time seconds. Following the flush-logs command, you can provide a space-separated list of one or more of the following log types: binary, engine, error, general, relay, slow.
https://dev.mysql.com/doc/workbench/en/wb-sql-editor-main-menu.html
When an SQL query tab is selected, the most important items on the main menu bar are the Query and Edit menus. SQL Query Menu The Query menu features the following items: Execute (All or Selection): Executes all statements in the SQL Query area, or ...
https://dev.mysql.com/doc/mysql-monitor/8.0/en/quan-advisor-ref.html
The possible values are: Yes: generate an event for each normalized query that exceeds a threshold No: generate a single event per MySQL Server summarizing all queries that exceed the thresholds. One Alert Per Query: generate events for queries ...