My site regularly gets extremely slow. When I check the running queries with
'show processlist;' I get this:
update XYZ set ... where id=...
select ... from XYZ where id=...
select ... from XYZ where id=...
select ... from XYZ where id=...
[...100's of similar selects...]
in other words: a single update is locking a table until all threads are
used up.
How is this possible ? The server is working on one single simple query (the
update), the other queries are waiting. What is the server doing ?
The problem occurs with different tables XYZ. The tables aren't very large
and the indices are simple.
I would very much like to hear how I can solve this. My site is getting
unacceptably slow and I dont really know what to do. I thought of
experimenting with LOW/HIGH priority but decided not to do it because it
doesn't make sense to me in this particular case.
mysql: 3.23.39 (rpm)
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