I gang

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.

Færdigheder: MySQL, PHP, System Administrator

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( 96 bedømmelser ) Arnhem, Netherlands

Projekt-ID: #5998572

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