SAP Note 28358 - Alerts disabled and other inexplicable errors

Symptom:

Alerts inexplicably set to 'disabled'.
Further inexplicable errors in the areas factory calendar buffer, TemSe, semaphore monitoring, database buffers, Nametab buffer, spool.
Shared memories are observed, whose create date (ipcs -ma) is before the last restart. (this is only allowed for SCSA!)

Cause and prerequisites

Shared memories that normally exist in the pool, were removed from the pool with ipc/shm_psize_ =0.
Some shared memories are not correctly cleaned up on shutdown if they are not in the pool. In particular, this is valid for shared memory with the SAP key 13, Alert Area.
Especially after an upgrade, problems can occur if shared memories are not cleaned up during the upgrade.

Solution
Use the standard configuration !
Avoid profile entries ipc/shm_psize_13 =0 ..psize_16 =0, or ensure that all shared memories are cleaned up on shutdown, for example with cleanipc or by rebooting the host.

Additional key words

shared memory pool ipc shm_psize_10, shm_psize_13, showipc cleanipc ipcs