Taken from: The WordPress MU Manual
Occasionally you will install a mu-plugin where the auto-install fails to add the db table(s) for you.
This means you will need to run the SQL code in the “sql.txt” on your WPMU database. Plugins that may require you to complete this step include this instruction in their install file. You use the “sqp.txt” file contained in the zip file you downloaded.
Run the SQL code in “sql.txt” on your WPMU database as follows:
1. Log into your cPanel
2. Scroll down to the database section and click on phpMyAdmin
3. Click on the name on of the database you want to run the sql code on
4. Click on the ‘SQL’ tab
5. Copy/paste the entire contents of the sql.txl into the Run SQL queries on database and then click Go.
6. If successful you should see a message saying it has been executed successfully.
Next up this week we’ll be looking at setting up a support email in cPanel.
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July 14, 2009 
Hi!
Thanks for the cool post and I think that Run the SQL code in “sql.txt” on WPMU database is really helpful and the procedure which is given step by step its really best one and keep post regularly ,stay tune with us,Thank U…………………:IOI:
Hi! its a nice post and the procedure of description its really great,Thanks for the post.