Database distribution for several SAP Systems

Hi gurues, we have a very important concern about SAP on Z systems, it is possible/recommended to have on on Z system only one DB engine with several databases that correspond to several SAP Systems running on the machine?
Because we have AIX platform right now and we can not have that kind of database landscape, we only can choose between MCOD or one dataabase engine with one datase in one machine (we can not share db engine).
Hope this question is clear enoguh for you.
Regards
Gustavo

Gustavo,
Sadly yes. You'll have to forgive some of my terminology. I actually work on the Basis team at my company and I am not a DBA. We happen to be running DB2 z/OS and we are using datasharing. For a sandbox ECC system we might have SID SE1 and DB2 sub-systems SE11 and SE12. For another sandbox BI system we might have SID SB1 and DB2 sub-systems SB11 and SB12. Even if datasharing is not used (and hence the 12 member would not exist, SE12 for instance), I would strongly recommend against MCOD and instead suggest using a different DB2 system for each SAP SID.
We have spoken to at least 1 customer that implemented their ECC (ABAP only) and Portal (Java only) SIDs as MCOD in the same DB2 z/OS system. Unfortunately, DB2 z/OS has some somewhat arbitrary limits for things like thread storage which MUST exist under the "2gig bar" (apparently due to some 31bit code still in use). Effectively, this limits the number of threads (and in the SAP world the number of SAP work processes) that a single DB2 member can service. I believe the limit is around 800 threads. Of course, with datasharing you can spread the load to multiple instances (SB11, SB12, SB13, SB14, etc), but then you must also plan for extra resources to be available in a planned failover for maintenance type situation. This particular customer ended up needing to fine-tune some java database threads and ended up needing an extra DB2 instance or two to handle the load during maintenance using planned failover.
Brian

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I want to use a webservice from a non-SAP system.
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Database distribution for several SAP Systems

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