What is Cost 100 in stored procedure

From: Yan Cheng Cheok <yccheok(at)yahoo(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: What is Cost 100 in stored procedure
Date: 2010-01-13 03:06:52
Message-ID: 80188.8897.qm@web65713.mail.ac4.yahoo.com
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May I know what is the meaning of Cost 100, at the end of stored procedure?

....
END;$BODY$
LANGUAGE 'plpgsql' VOLATILE
COST 100;
ALTER FUNCTION create_tables() OWNER TO postgres;

Thanks and Regards
Yan Cheng CHEOK

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