DA Morgan wrote:
Quote:
Doesn't DB2 have a table or index type comparable to Oracle's
Index Organized Table or SQL Server's Cluster Index where that
would not be the case?
I do not know SQL Server's Cluster Index, can't comment there.
DB2 does not have an "index only table".
There are two table types that have "some" overlap:
* Range Clustered Tables (RCT). These are essentially arrays on disk.
Typically used for for static look up tables
* Multi dimensional clustering. (MDC)
Organizing the data in an n-dimensional cube.
The individual blcoks are indexed instead of the rows and located by
intersecting (or or-ing) the dimensions. As a result block indexes are
tiny with one entry potentially covering thousands of rows.
So in a way both these approaches are "index-less" tables. The end
result is the same: Fast access without duplication of data.
Cheers
Serge
--
Serge Rielau
DB2 Solutions Development
IBM Toronto Lab
