Dear Postgresql experts,
I have a base table that declares a primary key spanning a couple of columns:
create table B (
id integer,
xx someothertype,
.
primary key (id, xx)
);
and a number of derived tables that inherit from B:
create table T (
) inherits (B);
An index is
Table T is not inheriting any indexes, neither the primary key constraint. That means that the search is going to use an index scan on table B and a sequential scan on table T (unless of course you add a primary key constraint or an index on table T).
You can check this things doing:
-SET
I asked if derived tables use primary key indexes generated in the base tables that
they inherit from.
Franco Bruno Borghesi replied:
[the derived table] is not inheriting any indexes, neither the
primary key constraint.
OK, thanks! I had come to the conclusion that it was not using the
I did a vacuum analyze before I run the following explain
June_03=# explain select * from tmp where route ='62.1.1.0/24';
QUERY PLAN
Seq Scan on tmp (cost=0.00..606.60
Is this a possible area for future enhancements?
Yes.
Karsten
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TIP 8: explain analyze is your friend
