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Re: large table indexing problem
Posted by: Rick James
Date: January 27, 2012 08:38PM

> most cpu is idling, load average 1.00, 1.00, 1.00
That sounds like a contradiction.
Perhaps you mean that 7 of the 8 cores are idle? That is to be expected. MySQL does not use more than one core for one connection.

SHOW CREATE TABLE -- that would give us some more clues.

How is the I/O? If one CPU is at 100%, then I would expect the I/O to be very low.

> 64GB memory,
> key_buffer_size = 6G
OK.

> Strangely, when I restart mysql, running time is shortened considerably.
That would have killed the ALTER, and you would need to start it over.

Unfortunately, live adding of an index is not yet available. It is possibly coming in future versions of InnoDB. (MyISAM is less likely.)

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