I'm trying to do a lot of inserts on a detail table, but with foreign
key schema it's too slow.
I made few tests.
1) Master table with 290,000 rows and 4 columns (primary key is SERIAL)
2) Detail table now with 1,300,000 rows and 3 columns (primary key is
SERIAL and I have a column master_id here pointing to a master table
record).
3) If I use:
ALTER TABLE detail ADD CONSTRAINT master_fk FOREIGN KEY master_id
REFERENCES master
I get 5 INSERTs per second using this:
INSERT INTO master VALUES (DEFAULT, 'Random 1', 'Random 2', 'Random 3');
SELECT CURRVAL('master_master_id_seq');
INSERT INTO detail VALUES (DEFAULT, XX, 999);
(random number of detail records, alternating with a insert into master)
I can insert just 5 rows/second.
4) So, I change it:
ALTER TABLE detail DROP CONSTRAINT master_fk;
And run INSERTs again.
Now, I have 1000 rows/second (with SELECT checking before every INSERT).
Is FOREIGN KEY so slow like that? What can I change in PostgreSQL
configuration?
Note that I run some VACUUM and CLUSTER. This let my INSERTs a very
little fast.
My (test) system is:
Linux 2.4.21
PostgreSQL 7.4.1
Pentium IV 1.8Ghz
256MB RAM
HD IDE
Could anyone help me?
--
Ricardo Vaz Mannrich <[EMAIL PROTECTED]>
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