MySQL reclaim index space after large delete?

Posted by cdunn on Server Fault See other posts from Server Fault or by cdunn
Published on 2013-10-22T20:30:07Z Indexed on 2013/10/22 21:56 UTC
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After performing a large delete in MySQL, I understand you need to run a NULL ALTER to reclaim disk space, is this also true for reclaiming index space?

We have tables using > 10G of index space and have deleted/archived large chunks of this data and unsure if we need to rebuild the table in order to decrease the size of the index.

Can anyone offer any advice?

We are trying to avoid rebuilding the table since it would take quite awhile and lock the table.

Thanks!

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