Hi,
the database is killed by the Linux 'oom-killer' process when Linux runs out of memory - looking at the database call stacks verifies this.
In your system the cachememorysize is set to 107264 pages. Each MaxDB page has a size of 8 KB, so the database will use 838 MB memory plus maybe 200-300 MB on top (depending on how many user tasks are configured...). I do not know how much memory the other applications are using on that server, but you need to check the total memory consumption of all applications against how much ram you have allowed for your VM. Has there been a 'sizing check' for that system? Was the hardware/software changed lately?
Thorsten