How To Avoid Repair With Keycache?

Question

I have had some experience with optimizing the my.cnf file but my database has around 4 million records (MyISAM). I am trying to restore from a mysqldump but every time I d

Answer 1

MySQL will use repair by keycache for MyISAM tables whenever the maximum possible size of the tables indexes are greater than the value for the variable myisam_max_sort_file_size.

You can calculate the maximum size of the index by adding up the byte size values for all keys in all the indexes and multiplying that by the number of rows in your table.

Increase the myisam_max_sort_file_size and your index will be rebuilt using sorting on disk, rather than with the slow keycache method.