From: | Joseph Shraibman <jks(at)selectacast(dot)net> |
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To: | pgsql-general(at)postgresql(dot)org |
Subject: | constraint performance |
Date: | 2003-04-08 20:49:53 |
Message-ID: | 3E9335F1.6010602@selectacast.net |
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Thread: | |
Lists: | pgsql-general |
create table taba( id int PRIMARY KEY, name text);
create table tabb( rid int PRIMARY KEY REFERENCES taba(id));
insert into taba values (1,'1');
insert into taba values (2,'2');
insert into tabb values(1);
explain delete from taba where id = 1;
explain delete from taba where id = 2;
The explain doesn't show any checking of the constraint, but the checking is done
somewhere. How much does the checking cost? If I delete any value from taba does it
check tabb to see if that row is refrenced, is something marked in the taba row to
indicate it is refrenced? If I update taba does it check only if I update id, or will it
check no matter what field I update?
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