Verursacht werden die Meldungen durch den neuen Index Cleanup Daemon des DB2 11.
Mit IBM DB2 PTF PI31459/UI26612 vom 24.04.2015 wird folgende Problematik behohen:
An index pseudo delete cleanup thread needs to acquire DBD lock and table lock before updating the index to remove the pseudo deleted entries. If the required locks have already been held by other applications, index pseudo delete cleanup thread could timeout and issue many DSNT376I and DSNT501I messages. Because index pseudo delete cleanup threads tend to give other applications higher priority, normally they are the victims in the timeout situation. Index pseudo delete cleanup threads are designed to run in the background and to not block other applications, issuing a large amount of timeout messages. This can be alarming to the users while there is no real contention in the system.