Bit datatype performance? - Mailing list pgsql-general

From Antonio Vieiro
Subject Bit datatype performance?
Date
Msg-id CAPHN3JX1YNxnGsu3q5A0wGqMMwjXMcmu8LnZ72jepE2A=t23hA@mail.gmail.com
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Re: Bit datatype performance?
List pgsql-general
Hi all,

One of my entities 'E' may be 'tagged' with an arbitrary set of 256 tags 'T'.

A first approach could be to add a M:N relationship between 'E' and 'T'.

A second way to do this could be to add a BIT(256) datatype to 'E',
setting bits to '1' if the entity is tagged with each one of the 256
tags (i.e. using a 'bitmask' on the set of tags).

Since querying entities 'E' with a certain set of tags 'T' must be
very fast I was wondering if the second approach would be faster. What
do you think?

Thanks for any hints,
Antonio

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