On Fri, 22 Feb 2008, Moritz Onken wrote:
I need to store a lot of 3-tuples of words (e.g. "he", "can", "drink"), order
matters!
The source is about 4 GB of these 3-tuples.
I need to store them in a table and check whether one of them is already
stored, and if that's the case to increment a column named "count" (or
something).
My suggestion would be to use three varchar columns to store the 3-tuples.
You should then create a B-tree index on the three columns together.
I thought of doing all the inserts without having an index and without doing
the check whether the row is already there. After that I'd do a "group by"
and count(*) on that table. Is this a good idea?
That sounds like the fastest way to do it, certainly.
Matthew
--
"We have always been quite clear that Win95 and Win98 are not the systems to
use if you are in a hostile security environment." "We absolutely do recognize
that the Internet is a hostile environment." Paul Leach <[EMAIL PROTECTED]>
---------------------------(end of broadcast)---------------------------
TIP 7: You can help support the PostgreSQL project by donating at
http://www.postgresql.org/about/donate
