I have an overall view about db2 index and its usage. I read this article http://www.dbazine.com/mullins_db2indexing.shtml
about db2 index and usage, where i have few doubts.
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i am using db2 v7.2 on aix/win2000 with fickpack 11
1)How to decide which index to use (btree or cluster index or any) under what cirsumstances. By looking at a query can we decide or any other information is required to decide this. some example's of query and how to decide this."few points are also mentioned in this site".
2)For all columns in GROUP BY and ORDER BY can i create a cluster index or i need to decide this based on some factors. if ,so what factors should i look and recommend for cluster index.
3)what does "If indexing a table, explicitly create a clustering index" mean ?
please also post some web reference.