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Upgrade from version 4 to version 5 and now the databases are missing and I have no idea where to find them. They are some *.frm files but how to fix it?

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This is very light on details. Please include: what OS you are using (version, architecture), the procedure you followed to perform the upgrade, what you mean when you say the databases are missing. – hellomynameisjoel Jun 24 '11 at 22:52


is the most standard place..

What operating system? Binaries or Precompiled

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Do you have backups? Upgrading without backups is a VERY bad idea. If you have backups I would go ahead and load them...

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