How do I repair a damaged MySQL table, rebuild index or prepare for backup ?

It is always worth trying a repair of MySQL tables before backing them up to shrink the files-sizes and check for inconsistencies in the indices...

from the SSH prompt, change directory to the location of the database
(usually /var/lib/mysql/databaseName)
and execute the MySQL ISAM Check command:
myisamchk -r *.MYI

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