Hello,
DB2 V8 LUW FP12 + Linux.
I have just turned on DB2's connection concentrator feature.
MAX_COORDAGENTS=1100 and MAX_CONNECTIONS=1500.
Two hours after restarting the instance, the db stopped responding.
Unfortunately, there was absolutely no message in db2diag.log
(diaglevel 3).
I was even unable to simply locally connect to the DB (no network
issues). A simple "list applications show detail" never returned any
results.
To bring the system back online, I had to kill -9 all db2 processes and
restart the instance.
I am puzzled. Why has DB2 stopped responding? Now everybody wants to
turn off connection concentrator.
I am actually interested in finding out how to troubleshoot a hung
system when you are unable to connect to the DB, and see absolutely
nothing in db2diag. Can anyone suggest any tools?
Thanks in advance.