Understanding DB2: Learning Visually with Examples (2nd Edition)
15.8. 64-Bit Memory Model Considerations
We suggest that you use DB2 on a 64-bit operating system whenever possible, since the limits discussed in the previous section do not exist. In addition, in a 64-bit environment, shared memory segments can be allocated and deallocated dynamically, making configuring and tuning of your DB2 server more dynamic and much easier. DB2 currently supports the following 64-bit operating systems:
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