I've posted a few times about problems with index corruption,
problems with inconsistent select results using indexes, and 
problems with hanging count(*) and distinct(*) on indexes.

No good suggestions were provided other than upgrade to 3.23.34,
(which I am loath to do unless I understand why), upgrade 
linux kernel due to certain problems with SMP boxes, or even
turn off a processor.

I've done two things, and had a clean day so far, the first
clean day in several weeks! It is too soon to say the problems
have gone, but it is looking better (touch wood).

Fix #1 : reboot the box
The box had half a year of uptime. I regarded this a badge of
honor. Unfortunately, even though the filesystem was clean,
it may be that the kernel had partly lost the plot sometime
in the last six months, and was no longer functioning perfectly.
(Not that any hint of that was provided in log messages).

Fix #2: upgrade to kernel 2.4.2

If I get no weirdness by the end of this week, then I am 100%
sure that either or both of these steps solved the problem..
Unfortunately I don't know which! It may be more the reboot,
than the new kernel, since problems definitely started in the
last few months.. I put it down to increased load, but maybe
that was incorrect.

So if your SMP server starts doing odd things and has been up
for a while .. a simple reboot costs nothing and may very well help.

-Justin

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