Fragmentation vs where clause obiee 10g rpd

Question

fragmentation vs where clause
In obiee we can do fragmentation of table.
for example if i have data from a to z. iam fragmenting data
from a to m in on LTS and M to Z in another.
this we can do with the where clause like in one LTS
data from A to Z by using where clause .. what is difference.
please help me.. any performance issues.
thank you.

Answer 1

In an enterprise world, data is often partitioned into multpile physical sources for a single logical table. This helps in organised data set with faster query results fetching. In such cases, BI server should know where to go for what type of data and under what conditions. Hence the fragmentation is defined to to handle efficient access by navigation to the appropriate physical source as per the request.
e.g. there may be an aggregate table and a detailed table being accessed for different requests appropriately.
This helps in performance improvement.
Adding a where clause will still refer to the same table source hence no benefit of this feature is exhibited in this scenario.