MYSQL expert needed

My database server is crashing and it wont come up

service mysqld start

Starting [url removed, login to view] server quit without updating PID file (/var/lib/mysql/[url removed, login to view])

Tried this already

his is kind of a common problem and may have several reasons. Sometimes when we simply want to restart the MySQL Server, we can get such an error:

ERROR! MySQL server PID file could not be found!

First of all, always check if the /tmp partition is full. This can happen when MySQL can’t write to the /tmp partition to create a lock file.

$ df -h

Also, this may be because, somehow the /tmp partition has been cleared and the MySQL server is looking for the PID file there. So easy-peasy just create a new pid file and restart the server.

$ touch /tmp/[url removed, login to view]

$ service mysqld restart

It can also help to check the status, sometimes it helps. For example sometimes you can get an error like this :

$ service mysqld status

ERROR! MySQL is not running, but lock file (/var/lock/subsys/mysql) exists

Well, it’s kind of obvious, just remove the lock file and restart the server.

$ rm /var/lock/subsys/mysql

$ service mysqld restart

If none of these help, and you’re getting an error like this:

$ service mysqld restart

ERROR! MySQL server PID file could not be found!

Starting MySQL. ERROR! The server quit without updating PID file (/var/lib/mysql/[url removed, login to view]).

Then there might be a more complicated problem. Check the log file at /var/lib/mysql/[url removed, login to view]

$ tail /var/lib/mysql/[url removed, login to view]

120602 16:54:09 mysqld_safe mysqld from pid file /var/lib/mysql/[url removed, login to view] ended

This line tells us that we have a compatibility problem with some of our tables and mysql fails to start in safe mode.

Now let’s change the way mysql starts to work around this situtation.

$ { echo “mysql_enable=\”YES\””; echo “mysql_args=\”–skip-grant-tables –skip-networking\””; } >> /etc/init/[url removed, login to view]

Time to restart

$ /etc/init.d/mysqld restart

You should a get successfull restart. Now try and upgrade the server.

$ mysql_upgrade

If it says you have the latest version, still force it.

$ mysql_upgrade –force

It will check every database if it’s ok. After that, we can return things to normal, comment out the last line we’ve added to /etc/init/[url removed, login to view]

$ sed -i ‘/mysql_args/s/^/#/’ /etc/init/[url removed, login to view]

$ service mysqld restart

Hope this helps.

Evner: MySQL, PHP, System Administrator

Se mere: safe touch, err com, write a grant, yes we expert, Mysql expert, mysql error, file partition, df, mysql safe mode, compatibility mode, comment mysql, mysql server example, safe expert, mysql lock, mysql create server, log tail, error mysql running lock exists, server crashing, safe time lock, time lock safe, grant database, create error log file, mysql status, echo file php, php echo file

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Projekt ID: #5998572

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