58 DB2 UDB V8 and WebSphere V5 Performance Tuning and Operations Guide
table space since it does not have to spend time extending the files for the
data and the indexes when new rows are inserted.
We recommend using SMS if you cannot estimate the size and the growth of
data. Temporary tables with data volume varies from small to large is a good
candidate of using SMS table space.
A
container is a physical storage device. It can be identified by a directory name
(SMS), a file name (DMS), or a raw device (DMS). A table space consists of
several containers, as you can see from Figure 3-6.
An
extent is a unit of space in a container and contains a number of pages; the
default is 32.
A
page has a size of 4 KB, 8 KB, 16 KB or 32 KB. You have to define ...