Can anyone tell me how can I kill all the sleeping processes?
I searched for it and I found that we can do it by command
mk-kill --match-command Sleep --kill --victims all --interval 10
I connected the DB server(Linux) but I find the message that command not found.
I tried to connect via MYSQL administrator and it doesn't say that command not found but also doesn't executes the query , just says you have an SQl error
login to Mysql as admin:
mysql -uroot -ppassword;
And than run command:
mysql> show processlist;
You will get something like below :
+----+-------------+--------------------+----------+---------+------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+-------------+--------------------+----------+---------+------+-------+------------------+
| 49 | application | 192.168.44.1:51718 | XXXXXXXX | Sleep | 183 | | NULL ||
| 55 | application | 192.168.44.1:51769 | XXXXXXXX | Sleep | 148 | | NULL |
| 56 | application | 192.168.44.1:51770 | XXXXXXXX | Sleep | 148 | | NULL |
| 57 | application | 192.168.44.1:51771 | XXXXXXXX | Sleep | 148 | | NULL |
| 58 | application | 192.168.44.1:51968 | XXXXXXXX | Sleep | 11 | | NULL |
| 59 | root | localhost | NULL | Query | 0 | NULL | show processlist |
+----+-------------+--------------------+----------+---------+------+-------+------------------+
You will see complete details of different connections. Now you can kill the sleeping connection as below:
mysql> kill 55;
Query OK, 0 rows affected (0.00 sec)
kill $queryID; is helpful but if there is only one query causing an issue;
Having a lot of MySQL sleeping processes can cause a huge spike in your CPU load or IO
Here is a simple one-line command (if behind the MySQL server is linux) which would kill all of the current sleeping MySQL processes:
for i in `mysql -e "show processlist" | awk '/Sleep/ {print $1}'` ; do mysql -e "KILL $i;"; done
This is only a temporary repair; I strongly advise identifying and addressing the problem's main cause.
For instance, you may set the wait timeout variable to the amount of time you want MySQL to hold open connections before shutting them.
But if the issue still persists and you have to investigate the DB queries that cause the problem there is another way. In screen session, you can use another while cycle to continuously kill the sleeping queries. (while there is an output of the mysql show processlit | grep -i sleep | awk id column and kill it.) If you are using MySQL replication between different hosts this will help them to catch up. So when using show slave status\G; Seconds_behind_master will be going to catch up.
Of course, you should investigate the root cause again.
Related
I have a 2.6GB file which I need to import and I used the command
sudo mysql -u root -p <dbname> > ~/<filename>.sql
I created a database from phpmyadmin and ran the above command.
It has been running for 30 minutes and when I run SHOW PROCESSLIST; on a separate window I get this
mysql> SHOW PROCESSLIST;
+-----+------+-----------+------+---------+------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+-----+------+-----------+------+---------+------+-------+------------------+
| 149 | root | localhost | test | Sleep | 1716 | | NULL |
| 155 | root | localhost | NULL | Query | 0 | init | SHOW PROCESSLIST |
+-----+------+-----------+------+---------+------+-------+------------------+
2 rows in set (0.00 sec)
What is happening and why is it gone to sleep? How do I solve this?
It turns out that mysql server in preferences keeps shutting down whenever I start it. How do I solve this?
A mysql query is running from last 24 hours and when we are trying to kill that query, it is saying you are not the owner of the query so you can't kill this query.
Do we know how to kill any running query?
run below query for show all running query
SHOW PROCESSLIST;
it will show all query in execution.
e.g
+-----+------+-----------+------+---------+------+----------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+-----+------+-----------+------+---------+------+----------+------------------+
| 253 | root | localhost | NULL | Query | 0 | starting | show PROCESSLIST |
+-----+------+-----------+------+---------+------+----------+------------------+
after that run below query
kill 253;
will kill that query
I have a thread showing in PHPmyadmin under processes. However, when I click kill, I get the error:
phpMyAdmin was unable to kill thread 148. It probably has already been closed.
Why does this thread still then show as active? How can I remove it entirely?
Open mysql client and type
mysql> show processlist;
+-----+------+-----------+------+---------+------+-------+------------------+-----------+---------------+-----------+
| Id | User | Host | db | Command | Time | State | Info | Rows_sent | Rows_examined | Rows_read |
+-----+------+-----------+------+---------+------+-------+------------------+-----------+---------------+-----------+
| 106 | root | localhost | NULL | Query | 0 | NULL | show processlist | 0 | 0 | 0 |
+-----+------+-----------+------+---------+------+-------+------------------+-----------+---------------+-----------+
1 row in set (0.00 sec)
you'll see processes with ID, than you can do this:
mysql> kill 106;
and your process (id = 106) will be killed.
Between the time that phpMyAdmin received the list of processes and the time you clicked to kill one of them, this process had finished by itself.
See also https://sourceforge.net/p/phpmyadmin/feature-requests/1490/.
This phenomenon is caused by the connection used to access PHPmyadmin itself, hence it doesn't show on the direct MySQLQuery. It can't be killed, as it would close the PHPmyadmin connection.
how to send mail alert for MySQL?
can we send alerts when the MySQL has large number of connections, or MySQL is not responding properly. Can someone help me to solve this prolem ?
You can do this in a number of ways. SHOW FULL PROCESSLIST; query would give you information about the number of connections as well as the queries being executed by each connection(thread). A sample result is as follows.
mysql> SHOW FULL PROCESSLIST;
+------+------+--------------------+------+---------+------+-------+-----------------------+
| Id | User | Host | db | Command | Time | State | Info |
+------+------+--------------------+------+---------+------+-------+-----------------------+
| 1298 | root | 192.168.1.76:37648 | NULL | Sleep | 0 | | NULL |
| 1491 | root | localhost | NULL | Query | 0 | init | show full processlist |
+------+------+--------------------+------+---------+------+-------+-----------------------+
If you are only concerned with the number of current connection(threads) you can use the following query.
mysql> SHOW STATUS WHERE `variable_name` = 'Threads_connected';
+-------------------+-------+
| Variable_name | Value |
+-------------------+-------+
| Threads_connected | 2 |
+-------------------+-------+
Now about the mail alerts, you can setup a cron job(shell script) to fire a mail alert as soon as the number of current connections exceed a certain limit. mail command can be used for this.
$ echo "Max MySQL Connections reached"| mail -s "your subject" your#email.com
Also, I came across a great MySQL Monitoring tool- MONyog. It would let you setup mail alerts for any of the MySQL variable.
I found that my mysql sever have many of connection who is sleep. i want to delete them all.
so how i can configure my mysql server than then delete or dispose the connection who is in sleep not currently in process.
are this possible to delete this thing in mysql tell me how i can do following
a connection allow only one time datareader open and destroy the connection [process] after giving resposnse of query.
If you want to do it manually you can do like this:
login to Mysql as admin:
mysql -uroot -ppassword;
And than run command:
mysql> show processlist;
You will get something like below :
+----+-------------+--------------------+----------+---------+------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+-------------+--------------------+----------+---------+------+-------+------------------+
| 49 | application | 192.168.44.1:51718 | XXXXXXXX | Sleep | 183 | | NULL ||
| 55 | application | 192.168.44.1:51769 | XXXXXXXX | Sleep | 148 | | NULL |
| 56 | application | 192.168.44.1:51770 | XXXXXXXX | Sleep | 148 | | NULL |
| 57 | application | 192.168.44.1:51771 | XXXXXXXX | Sleep | 148 | | NULL |
| 58 | application | 192.168.44.1:51968 | XXXXXXXX | Sleep | 11 | | NULL |
| 59 | root | localhost | NULL | Query | 0 | NULL | show processlist |
+----+-------------+--------------------+----------+---------+------+-------+------------------+
You will see complete details of different connections. Now you can kill the sleeping connection as below:
mysql> kill 52;
Query OK, 0 rows affected (0.00 sec)
Why would you want to delete a sleeping thread? MySQL creates threads for connection requests, and when the client disconnects the thread is put back into the cache and waits for another connection.
This reduces a lot of overhead of creating threads 'on-demand', and it's nothing to worry about. A sleeping thread uses about 256k of memory.
you can find all working process execute the sql:
show process;
and you will find the sleep process, if you want terminate it, please remember the processid and excute this sql:
kill processid
but actually you can set a timeout variable in my.cnf:
wait_timeout=15
connect_timeout=10
interactive_timeout=100
for me with MySql server on windows,
I update the file (because cannot set variable with sql request due privileges):
D:\MySQL\mysql-5.6.48-winx64\my.ini
add the lines:
wait_timeout=61
interactive_timeout=61
restart service, and acknowledge new values with:
SHOW VARIABLES LIKE '%_timeout';
==> i do a connection tests and after 1 minutes all 10+ connections in sleep are disapeared!