SAP Note 27102 - Chunk table overflow

Symptom:

For dbspace enhancement using onmonitor, the following error message appears:
Cannot add a new chunk to the dbspace
ISAM error INF-137: chunk table overflow

Cause and prerequisites

The maximum number of chunks in the ONCONFIG file was reached. The value is set with the parameter CHUNKS, and is set to 32 as default.

Solution
Increase parameter CHUNKS in the ONCONFIG file (for example, to 64).
The maximum allowed depends on the number of files which a process can keep open at the same time. The number of open files for each process can be configured for each operating system level.
The value of the parameter must lie in the following range:
Minimum : Number of dbspaces
Maximum : (number of open files for each process - 6), to a maximum of 2047

Additional key words

onmonitor ONCONFIG