Bruno Wolff III wrote:
On Thu, Jun 02, 2005 at 13:40:53 +0100,
Richard Huxton <dev@archonet.com> wrote:
Actually, Dinesh didn't mention he was using this for the speed of
lookup. He'd defined the columns as being the PRIMARY KEY, presumably
because he feels they are/should be unique. Given that they are rows
from a logfile, I'm not convinced this is the case.
Even for case you could still use hashes. The odds of a false collision
using SHA-1 are so small that some sort of disaster is more likely.
Another possibility is if there are a fixed number of possible messages,
is that they could be entered in their own table with a serail PK and
the other table could reference the PK.
Certainly, but if the text in the logfile row is the same, then hashing
isn't going to make a blind bit of difference. That's the root of my
concern, and something only Dinesh knows.
--
Richard Huxton
Archonet Ltd
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
