The Db2 address spaces

Db2® requires several different address spaces.

Figure 1 shows these address spaces.

Various tasks are performed in the different address spaces, as follows:

DSN1MSTR

for system services that perform a variety of system-related functions.

DSN1DBM1

for database services that manipulate most of the structures in user-created databases.

DSN1DIST

for distributed data facilities that provide support for remote requests.

IRLMPROC

for the internal resource lock manager (IRLM), which controls Db2 locking.

DSN1SPAS

for stored procedures, which provide an isolated execution environment for user-written SQL.