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the names of which all start with the subsystem-id (SSID):

  <SSID>MSTR = system services address space
  <SSID>DBM1 = database services address space
  <SSID>DIST = DDF (distributed data facility) address space

(next to these, you might have others, like the Stored Procedures
address space and the IRLM (Integrated Resource Lock Manager) address
space, but naming for these is not fixed)
You should be able to identify your SSID's via SDSF's "Status
Display" (option ST on SDSF's Primary Option Menu).
Use the following subcommands to show the various types of fixed
address spaces:

  SELECT *MSTR
  SELECT *DBM1
  SELECT *DIST

from which you can deduct your SSID's. 

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