Solution:1

Run this from your server’s command line:

 mysqlcheck --repair --all-databases

Solution:2

I had the same issue when my server free disk space available was 0

You can use the command (there must be ample space for the mysql files)

REPAIR TABLE `<table name>`;

for repairing individual tables

Solution:3

Connect to your server via SSH

then connect to your mysql console

and

USE user_base
REPAIR TABLE TABLE;

-OR-

If there are a lot of broken tables in current database:

mysqlcheck -uUSER -pPASSWORD  --repair --extended user_base

If there are a lot of broken tables in a lot of databases:

mysqlcheck -uUSER -pPASSWORD  --repair --extended -A

Solution:4

This means your MySQL table is corrupted and you need to repair it. Use

myisamchk -r /DB_NAME/wp_posts

from the command line. While you running the repair you should shut down your website temporarily so that no new connections are attempted to your database while its being repaired.