* Jon Stewart:
> 1. Which datatype should I use to represent the hash value? UUIDs are
> also 16 bytes...
BYTEA is slower to load and a bit inconvenient to use from DBI, but
occupies less space on disk than TEXT or VARCHAR in hex form (17 vs 33
bytes with PostgreSQL 8.3).
> 2. Does it make sense to denormalize the hash set relationships?
That depends entirely on your application.
> 3. Should I index?
Depends. B-tree is generally faster than Hash, even for randomly
distributed keys (like the output of a hash function).
> 4. What other data structure options would it make sense for me to
> choose?
See 2.
In general, hashing is bad because it destroy locality. But in some
cases, there is no other choice.
--
Florian Weimer <fweimer@bfk.de>
BFK edv-consulting GmbH http://www.bfk.de/
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