… trace originated from php stream functions not from libmysql or memcache.so, which means it is not MySQL or memcache connections leaving last… know any debugger which can connect to PHP process or apache with mod_php and provide backtrace in PHP terms not the one for… happening with the process are not only helpful to debug sleeping connections with MySQL but many other cases when you see web application…
Post: Apache PHP MySQL and Runaway Scripts
May 20, 2008 By 20 Comments
… long time. For simplicity I did not use MySQL, but other system call – sleep() which has similar behavior for sake of experiment… connection abort from client will not be discovered. This is unfortunately very serious limitation in practice when you’re using MySQL with PHP… open another MySQL connection to kill the query which was running (otherwise query may well continue to run even if PHP script is…
Post: Implications of Metadata Locking Changes in MySQL 5.5
February 1, 2013 By 9 Comments
… | 1 | msandbox | localhost | test | Sleep | 403 | | NULL | | 3 …mysql.com/bug.php…MySQL server or causing all the connections to get depleted. There are some other interesting consequences as well for application that use MySQL…
Post: Impact of the number of idle connections in MySQL
December 17, 2010 By 21 Comments
… $numconn idle connections” php ./make_conn.php $numconn & cat dbt2.sql | mysql -h 10.2.2.129 -u root dbt2 sleep 120 ./run_mysql.sh -h… killall php sleep 2 done for i in `seq 1 15` do numconn=$((i*100)) echo “Doing $numconn idle connections” php ./make_conn.php $numconn & cat dbt2.sql | mysql -h 10.2.2.129 -u root dbt2 sleep 120 ./run_mysql.sh -h…
Comment: Debugging sleeping connections with MySQL
May 20, 2009 By 30 Comments
… connections to last over 30 min, or you can have a cron script that checks the db and kills really old sleeping connections. my.cnf: wait_timeout=180 # = 30min php cron script: #!/usr/bin/php -q 1000 && $row['Command'] == “Sleep“) && ($row['User'] != “Root”)) { $killed = 0; mysql…
Comment: Apache PHP MySQL and Runaway Scripts
May 21, 2008 By 20 Comments
… the client disconnect. It’s not a PHP problem, it’s a web app problem. … know that the client is there. The MySQL SLEEP function gives me thoughts about possible SQL …SLEEP(99999999) (choose your number) and disconnect. Doing it till there are no more web processes/threads, or the MySQL connections…
Comment: Why do you need many apache children ?
February 17, 2008 By 15 Comments
… per hour in mysql error log. After changing Timeout directive in httpd.conf, all seems to be ok. Mysql connections in sleep state only are available for short duration and there are no aboted_clients in mysql error log. Opening… me that the main bottleneck of web server only serving php scripts is CPU not RAM. Modern best dual CPUs can…
Comment: MySQL for Hosting Providers - how do they manage ?
November 28, 2008 By 15 Comments
… connection ID. Kill that connection…. | 3 | init | select sleep(10) | +—–+——+———–+——+———+——+——-+———————–+ mysql> show full processlist; +—–+——+———–+——+———+——+——-+———————–+ | … shell access, PHP access, …
Comment: Debugging sleeping connections with MySQL
March 15, 2011 By 30 Comments
… SQL comment is useless in sleep state as the INFO column in processlist is NULL when connection is sleeping (understandable as there is… was executed on that connection. Then tracking info in an SQL comment becomes much more useful in these “sleeping thread”, and other… consider it to be worthy of their attention… http://forge.mysql.com/worklog/task.php?id=384 Cheers //Steve
Comment: Debugging sleeping connections with MySQL
May 20, 2009 By 30 Comments
… seeing this occurring due to every apache connection opening a mysql connection (as is common in a PHP driven website). If there is a… a new sleeping mysql connection is made 8. mysql & apache reach max_connections 9. server slows to a crawl Solution: – Reduce the time a mysql connection is…
