The event cannot extend has been triggered on the database ADS01.
Have u checked that database for any segments which will fail to extend either due to space or reached max_extents??

It sounds as though Patrol is monitoring for those type of segments and has found one (or more).

Hope this helps
Thanks for answering.

Yes, I have checked. There is enough free space in my raw partitions and enough high value for MAXEXTENTS in every tablespace.

The funny thing is that the same message came also 1 month ago. It's not nice to be called on the mobile at midnight.....

All I found out is the CannotExtend is a new parameter for Patrol. Could it be that the Patrol team has not set it?