Dan Harris wrote:

> even the  explain never
finishes when I try that.

Just a short bit. If "EXPLAIN SELECT" doesn't return, there seems to be
a very serious problem. Because I think EXPLAIN doesn't actually run the
query, just has the query planner run. And the query planner shouldn't
ever get heavily stuck.

I might be wrong, but there may be something much more substantially
wrong than slow i/o.

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