November 2001
Intermediate to advanced
158 pages
5h 10m
English
Content preview from IBM ESS and IBM DB2 UDB Working Together
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42 IBM ESS and IBM DB2 UDB Working Together
All in all, the conventional wisdom is that you will pay approximately a 10% performance
penalty for choosing SMS tablespaces. Many people are willing to pay that penalty for the
convenience.
3.6.2 DMS raw tablespaces
DMS stands for database managed storage. This represents the other extreme. Although the
operating system knows that the storage devices exist, that storage is not made available to
the system. It is given over to DB2 “raw,” unsullied by any operating system intervention.
In tablespaces composed of raw containers, there is no file system overhead. DB2 creates,
grows, shrinks, and deletes tables; allocating and freeing space within the container. Since
container space is preallocated, DB2 ...
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