From: | "Timasmith" <timasmith(at)hotmail(dot)com> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | which is more scalable for the database? |
Date: | 2007-03-07 11:46:53 |
Message-ID: | 1173268012.906695.70300@64g2000cwx.googlegroups.com |
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Thread: | |
Lists: | pgsql-general |
Suppose I have a database table with 20 fields which are lookups to a
single table.
configtable(configtable_id, a_field, something_lookup_id,
another_lookup_id, ...)
lookup(lookup_id, value, description, ...)
what is going to be faster to map the rows to an Object which needs
the 'value' for every field ending in lookup_id
a) View
select c.configtable_id, l1.value as something_lookup, l2.value as
another_lookup
from configtable c,
lookup l1,
lookup l2
where c.something_lookup_id = l1.lookup_id
and c.another_lookup_id = l2.lookup_id
foreach row
map values to object
end
b) Cache all lookup values and populate
select c.* from configtable
foreach row
map values to object
if lookup_id
find value from hashtable and map value to object
endif
end
It seems that the latter *might* be better to scale outward better,
as
you could add application servers to do the caching/mapping and you
only select from a single table?
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