From: | Dan Black <fireworker(at)gmail(dot)com> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | Foreign keys and slow insert |
Date: | 2005-06-08 15:40:57 |
Message-ID: | 27f6062505060808401a458177@mail.gmail.com |
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Thread: | |
Lists: | pgsql-general |
I read in documentation that primary key doesn't require additional indexes
but I could find nothing about foreign keys.
Do I need to create additional indexes when I create foreign keys?
Example:
create table master
{
master_id INT4,
master_name VARCHAR(64),
CONSTRAINT master_pkey PRIMARY KEY (master_id)
}
create table slave
{
slave_id INT4,
slave_name VARCHAR(64),
master_id INT4,
CONSTRAINT slave_pkey PRIMARY KEY (slave_id),
CONSTRAINT slave_fkey_master_id FOREIGN KEY (master_id) REFERENCES master
(master_id) ON UPDATE CASCADE ON DELETE RESTRICT
}
Do I need to create index
CREATE INDEX my_index
ON slave
USING btree
(master_id);
?
Thanks
--
Verba volent, scripta manent
My ISP - http://www.netbynet.ru
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