Read: http://dev.mysql.com/doc/refman/5.0/en/repair.html
Corrupted mysql datafile
When doing a query, if it returns something likeCan't find file tbl_name.MYI (Errcode: nnn)
Do a perror nnn, for instance
shell> perror 126 127 132 134 135 136 141 144 145 MySQL error code 126 = Index file is crashed MySQL error code 127 = Record-file is crashed MySQL error code 132 = Old database file MySQL error code 134 = Record was already deleted (or record file crashed) MySQL error code 135 = No more room in record file MySQL error code 136 = No more room in index file MySQL error code 141 = Duplicate unique key or constraint on write or update MySQL error code 144 = Table is crashed and last repair failed MySQL error code 145 = Table was marked as crashed and should be repaired
myisamchk
If you want to check all MyISAM tables and repair any that are corrupted, you can use the following command:myisamchk --silent --force --fast --update-state \ --key_buffer_size=64M --sort_buffer_size=64M \ --read_buffer_size=1M --write_buffer_size=1M \ /path/to/datadir/*/*.MYI
If the error code is 145, do a myismchk /path/to/db.MYI will fix the error.
If the error code is 135, do
ALTER TABLE tbl_name MAX_ROWS=xxx AVG_ROW_LENGTH=yyy;
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