This is the H2

HowTo Use PHPMyAdmin to Repair a Table

Question: I’m receiving an error from my site that the exp_online_users table has crashed, and needs to be repaired. How do I fix the problem?

Answer: To fix this problem, you’ll need to have access to a tool such as PHPMyAdmin. If you don’t have access to PHPMyAdmin, you may need to contact your web host and have them repair the table.

If you do have access to PHPMyAdmin, do the following to fix the exp_online_users table:

1. Login to PHPMyAdmin. If you’re having trouble logging in, contact your web host for assistance.

2. Locate the database where your ExpressionEngine tables are stored. You may have more than one database, make sure you pick the right database.

Choose Table to Repair

PHPMyAdmin

3. Find the table you need to repair. On the left side of the table name, click on the check box.

4. Scroll down to find the last of the tables, and below find the drop down menu. Choose Repair Table.

When you choose Repair Table, you’ll see a results screen similar to the one below.
View Results
View Results
Now you’ll be able to go back into ExpressionEngine and the error should be gone.

NOTE: This information applies to both ExpressionEngine 1.x and ExpressionEngine 2.x

Repairing Tables

Reverting to 1.6.8 Install after Installing 2.0

Question: Can I go back to EE 1.6.8 if I don't like EE 2.0?

Answer: Not easily. ExpressionEngine makes significant changes to the MySQL database. Going back?