Whenever the MySQL server experiences heavy load, Zope seems to hang,
such that we can't even access the ZMI.

Is this a bug in version 2.7.6 or ZMySQLDA ?
Seems that all your Zope threads are busy (they're waiting
for database response). There is no more threads to serve
next requests so they're waiting (you may say that zope hangs
in this situation, but in fact all it's threads are waiting for DB).
You may install DeadlockDebugger product and you'll be
able to see what your's Zope threads are really doing.

Or are there some settings I can tweak to adjust some database
connection timeout value ?
AFAIK not in Zope. Take a look at ZMySQLDA or rather the
python MySQL library it uses. Maybe there is something like that.
You may ask this question on Zope-DB list.

Maciej Wisniowski
Zope maillist  -  Zope@zope.org
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