Joseph, I have a hosting customer that is having this same problem, I think. Unfortunately, I’m not a WordPress expert and so I’m not sure. I don’t see a table called commentmeta in their install, but their comment table is almost 800MB in size and their dashboard says they only have around 3,000 comments and less than a dozen in the spam queue. Queries are running very slow as a result of the size of this table. They disabled the Akismet plug-in this morning to stop the growth of the table.
I’d like to delete the extra data from her comment table, but not being familiar with WordPress table structures or Akismet, I don’t know what criteria to use to delete the Akismet data without also deleting her comments.
Can you help? ??