Hitting Ctrl+C (a couple of times) kills mysql completely and takes me back to shell, so I have to reconnect. Set long_query_time to the number of seconds that a query should take to be considered slow, say 0.2. Then run your code and any query … I checked the Queries executing using trx_mysql_thread_id in events_statements_history and events_statements_history_long and found there are multiple Queries. To use it, open the my.cnf file and set the slow_query_log variable to "On." Another useful tool in MySQL is the included slow query logging feature, which is the preferred way of regularly finding long-running queries. SELECT trx.trx_id, trx.trx_started, trx.trx_mysql_thread_id FROM INFORMATION_SCHEMA.INNODB_TRX trx WHERE trx.trx_started < CURRENT_TIMESTAMP - … Script This script fi It prints and prints and I already know this is not what I meant. Before you can profile slow queries, you need to find them. We are experiencing high load since about 4 days ago. Automatic kill of long running queries? MySQL very long-running queries. Viewed 813 times 3. Either way, these queries bear investigating. Long-running MySQL queries can bring down the whole database even before you react. This will give you opportunity to keep application running while you debug the issues. -v verbosity for debugging. Posted by: Chevy Mark Sunderland Date: July 03, 2012 05:06AM Hi, is there a way to set the max. log-slow-queries slow_query_log = 1 # 1 enables the slow query log, 0 disables it slow_query_log_file = < path to log filename > long_query_time = 1000 # minimum query time in milliseconds Save the file and restart the database. Today we detected some threads looping on one of our servers for several hours slowing down the server. You can adjust this feature using several directives, but the most commonly needed settings are: I have a quite large db (800+Mb dump file) that I imported to my local server. Here we will use the information_schema coupled with the performance_schema to find more information about the open transactions. There are around 160,000 posts inside. I would like to stop the query. Given a long running time of say 1 second, we can do the following. These may be ETL, reports, or other queries that should run long. MySQL has a built-in slow query log. usage: check_mysql_long_running_queries [options] options: -h, --help show this help message and exit -H H host -P P port -t T threshold -u U user -p P password -e E exclude queries containing comment -c C read credentials from a file. With MySQL, as with any other application, this can mean a human looking at logs to identify offending processes. Set slow_query_log_file to the path where you want to save the file. Can someone Explain what is the meaning of the above transaction, It shows transaction is running but trx_query is NULL . time a mysql-thread runs before it is killed automatically? The only catch is that you often miss queries which execute very quickly, so it is most useful for longer-running queries or when the MySQL server has queries which are backing up - in my experience this is exactly the time when I want to view "live" queries. Long running queries have been found in the plan cache. Every now and then I run a SELECT query that is too big. One of the ways to keep the application running and debug long running query issues is by monitoring, logging and killing them. It's a Wordpress db from witch I need to extract certain posts. Active 2 years, 8 months ago. I figured out 2 solutions to the problem of monitoring MySQL for long running queries: Automatically monitor the MySQL slow query log. Automatically monitor the processlist table in the MySQL information_schema. You can also add conditions to make it more specific just any SQL query. Ask Question Asked 5 years ago. I connect to mysql from my Linux shell. 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