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OK I was adding an index to a table, and I checked on progress using show processlist and under state it output Repair by sorting.

From the MySQL docs:

Repair by sorting

The repair code is using a sort to create indexes.

So what is the 'repair code'? Did something break?

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up vote 1 down vote accepted

Nothing broke, it's just part of the process of rebuilding indexes on a table. This can take quite a while on very large tables.

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+1 !!! This also includes the dreaded 'Repair by keycache' if sort buffers are not large enough for 'Repair by sorting' to complete. – RolandoMySQLDBA May 18 '11 at 2:32

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