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MySQL was not starting. I backed up /var/lib/mysql/*. I uninstalled MySQL and reintalled it. It started again. I copied everything back to /var/lib/mysql. I restarted the service. I logged in and could see all of my tables. When I try to view their contents, I get:

Table 'tablename' doesn't exist

Is there something I need to do to make MySQL recognize the files I copied back into the /var/lib/mysql/ folder?

Any help is appreciated, I'm dying here.

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up vote 4 down vote accepted

Check permissions, make sure ownership and permissions are correct on /var/lib/mysql. This is typically mysql. If this is not the issue, produce output of your .err log file.

Try the following to correct permissions:

chown -R mysql:mysql /var/lib/mysql
find /var/lib/mysql -type d -exec chmod 770 {} \;
find /var/lib/mysql -type f -exec chmod 660 {} \;

The error log is located in the data directory, which appears to be /var/lib/mysql in your case. Verify in your cnf file.

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I ran chmod -R 777 /var/lib/mysql/ and still had the same problem. Where is the mysql error log located in a standard Ubuntu install? – Kirk Ouimet Sep 21 '10 at 20:56
Bad idea, should almost never have public writable stuff. Check out my edit. – Warner Sep 21 '10 at 21:13
Thanks for the tweak on permissions. On closer inspection I found that some of my tables existed, and others didnt. Looks like data corruption killed the tables that weren't being found.I found a backup of everything and reimported the data from the backup (thank goodness!). – Kirk Ouimet Sep 21 '10 at 21:19
I'm glad everything worked out! – Warner Sep 21 '10 at 22:01

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