Re: Firebird and PostgreSQL at the DB Corral.

kleptog@svana.org says...


> A partial index is a index on a subset of a table. The case I can think of
> is a list of transactions, some of which are yet to be billed. They have a
> BillID field which is NULL. since this is the recent set it is queried quite
> often, so you can build an index like:

> CREATE INDEX x ON table ( customerid ) WHERE billid IS NULL

> Now an index can be used on customer when searching for only unbilled things
> whereas normally it would also have to search for all historical things as
> well.

> So, you get the benefit of a smaller index that is more useful to boot.


Hmmm... this is kinda like the Oracle thing where tables can be
partitioned? Sort of?


Paul...



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