Best Practices for SAP BI using DB2 9 for z/OS - IBM Redbooks

Figure 2-10 DPSIs versus NPSIs
Figure 2-10 explains the difference between DPSI and NPSI for a table with two
partitions.
CREATE TABLE T
(YEAR,COUNTRY,TYPE,...)
PARTITION BY YEAR
PARTITION 1 ENDING 2005
PARTITION 2 ENDING 2006
CREATE INDEX NPSI
ON T (TYPE ASC)
CLUSTER
CREATE INDEX DPSI
ON T (COUNTRY ASC)
PARTITIONED
Pros: Full partition independence:
parallel utilities (REORG, LOAD, RECOVER)
partition scope operations (add, rotate, reset)
data affinity in data sharing
potentially more efficient partitions pruning
No BUILD2 phase in online REORG if DPSI-only
22 Best Practices for SAP BI using DB2 9 for z/OS
Table T
DPSI
2005 BH 1 ...
NPSI
2005
2005
DE
AU
1
2
...
...
AU
BH
1 2005 AU 3 ... DE
2 2005 DE 4 ...
3
4
2006
2006
2006
2006
2006
DE
DE
BH
AU
BH
2
3
3
3
4
...
...
...
...
...
AU
BH
DE
Cons: Multiple index traversals for
queries without pruning option