| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com> |
| Cc: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Peter Eisentraut <peter_e(at)gmx(dot)net>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Subject: | Re: Support for REINDEX CONCURRENTLY |
| Date: | 2013-06-18 12:54:52 |
| Message-ID: | 20130618125452.GF5646@awork2.anarazel.de |
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| Lists: | pgsql-hackers |
Hi,
On 2013-06-18 11:35:10 +0200, Andres Freund wrote:
> Going to do some performance tests now.
Ok, so ran the worst case load I could think of and didn't notice
any relevant performance changes.
The test I ran was:
CREATE TABLE test_toast(id serial primary key, data text);
ALTER TABLE test_toast ALTER COLUMN data SET STORAGE external;
INSERT INTO test_toast(data) SELECT repeat('a', 8000) FROM generate_series(1, 200000);
VACUUM FREEZE test_toast;
And then with that:
\setrandom id 1 200000
SELECT id, substring(data, 1, 10) FROM test_toast WHERE id = :id;
Which should really stress the potentially added overhead since we're
doing many toast accesses, but always only fetch one chunk.
One other thing: Your latest patch forgot to adjust rules.out, so make
check didn't pass...
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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