Hi
plpgsql has zero optimization for this kind of functions. It is best glue
for SQL statements and relative bad for high expensive numeric
calculations. It is very simple AST interpret only.
Try to use PLPerl, PLPython, PLLua instead for this purposes.
Pavel
2014-08-04 22:48 GMT+02:00
On 05/08/14 17:56, Mark Kirkwood wrote:
Adding in the 'if' in the float8 case increases run time to 4s. So looks
like plpgsql might have a slightly higher cost for handling added
conditionals. Be interesting to dig a bit more and see what is taking
the time.
Thinking about this a bit more,
Hi Claudio,
I think there has been a misunderstanding. I agree with you (and I
think also Marco) that LSN is definitely a component to consider in
this process. We will come up with an alternate proposal which
considers LSNS either today or tomorrow. ;)
Thanks,
Gabriele
--
Gabriele Bartolini
On Mon, Aug 4, 2014 at 11:48 PM, testman1316 danilo.rami...@hmhco.com wrote:
In both we ran code that did 1 million square roots (from 1 to 1 mill). Then
did the same but within an If..Then statement.
Note: once we started running queries on the exact same data in Oracle and
PostgreSQL we saw
I've been working away at allowing semi and anti joins to be added to the
list of join types that our join removal code supports.
The basic idea is that we can removal a semi or anti join if the left hand
relation references the relation that's being semi/anti joined if the join
condition matches
Hi Kyotaro,
I looked at the patches and felt that the approach taken here is too
intrusive, considering that the feature is only for foreign scans.
There are quite a few members added to the generic Path, Plan structures,
whose use is is induced only through foreign scans. Each path now stores
On Wed, Jul 16, 2014 at 4:34 AM, Pavel Stehule pavel.steh...@gmail.com wrote:
2014-07-15 12:07 GMT+02:00 Fujii Masao masao.fu...@gmail.com:
On Tue, Jul 15, 2014 at 7:01 PM, Pavel Stehule pavel.steh...@gmail.com
wrote:
2014-07-15 11:29 GMT+02:00 Fujii Masao masao.fu...@gmail.com:
On Tue, Jul 29, 2014 at 7:07 PM, furu...@pm.nttdata.co.jp wrote:
I have improved the patch by making following changes:
1. Since stream_stop() was redundant, stream_stop() at the time of WAL file
closing was deleted.
2. Change the Flash judging timing for the readability of source code.
On Tue, Aug 5, 2014 at 9:04 PM, Fujii Masao masao.fu...@gmail.com wrote:
On Tue, Jul 29, 2014 at 7:07 PM, furu...@pm.nttdata.co.jp wrote:
I have improved the patch by making following changes:
1. Since stream_stop() was redundant, stream_stop() at the time of WAL file
closing was deleted.
Em segunda-feira, 4 de agosto de 2014, testman1316 danilo.rami...@hmhco.com
escreveu:
SET SERVEROUTPUT ON
SET TIMING ON
DECLARE
n NUMBER := 0;
BEGIN
FOR f IN 1..1000
LOOP
n := SQRT (f);
END LOOP;
In addition to the other suggestions that have been posted (using a
On Sat, Aug 2, 2014 at 1:40 AM, Heikki Linnakangas hlinnakan...@vmware.com
wrote:
I ran this through my WAL page comparison tool to verify that all the WAL
record types are replayed correctly (although I did some small cleanup
after
that, so it's not impossible that I broke it again; will
On Wed, Jul 23, 2014 at 5:21 PM, Pavan Deolasee
pavan.deola...@gmail.com wrote:
1. Need for compressing full page backups:
There are good number of benchmarks done by various people on this list
which clearly shows the need of the feature. Many people have already voiced
their agreement on
Roberto Mello roberto.me...@gmail.com wrote:
In addition to the other suggestions that have been posted (using
a procedural language more suitable to mathematical ops, etc) I
noticed that you are using a RAISE in the PostgreSQL version that
you are not in Oracle.
I am curious as to what the
On Tue, Aug 5, 2014 at 9:50 AM, Kevin Grittner kgri...@ymail.com wrote:
Since that is outside the loop, the difference should be nominal;
Apologies. I misread on my phone and though it was within the loop.
and in a quick test it was. On the other hand, reducing the
procedural code made a
hi, all
I already can debug general postgres using ddd and select
pg_backend_pid(); , now, I want to study the details of the system
catalog cache and system cache management, so I need to debug the function
InitPostgres() and InitCatalogCache(), and I tried the following steps:
[refer: How to
On Tue, Jul 15, 2014 at 10:45 PM, Magnus Hagander mag...@hagander.net wrote:
On Wed, Jul 2, 2014 at 10:52 PM, Tom Lane t...@sss.pgh.pa.us wrote:
I wrote:
In short, maybe we ought to invent a new category PGC_SU_BACKEND (not
wedded to this spelling), which is to PGC_BACKEND as PGC_SUSET is to
On 08/05/2014 12:56 AM, Mark Kirkwood wrote:
The moral of the story for this case is that mapping Oracle to Postgres
datatypes can require some careful thought. Using 'native' types (like
integer, float8 etc) will generally give vastly quicker performance.
We've seen a lot of this ourselves.
You are correct sir, 4.1 seconds. Are you a consulant? We ae looking for a
Postgresql guru for advice. We are doing a proof of concept of Postgresql on
AWS
From: Mark Kirkwood-2 [via PostgreSQL]
[mailto:ml-node+s1045698n5813763...@n5.nabble.com]
Sent: Tuesday, August 05, 2014 12:58 AM
To:
On Thu, Jun 5, 2014 at 4:43 AM, Amit Kapila amit.kapil...@gmail.com wrote:
I have improved the patch by making following changes:
a. Improved the bgwriter logic to log for xl_running_xacts info and
removed the hibernate logic as bgwriter will now work only when
there is scarcity of
On Sun, Jul 6, 2014 at 3:12 PM, Andres Freund and...@2ndquadrant.com wrote:
If you want to do that, it's fine with me. What I would do is:
- Back-patch the addition of the sparcv8+ stuff all the way. If
anyone's running anything older, let them complain...
- Remove the special case for
On Sat, Aug 2, 2014 at 9:15 AM, Daniele Varrazzo
daniele.varra...@gmail.com wrote:
I'd definitely replace /arg/argument/. Furthermore I'd avoid the form
argument 1: something is wrong: the string is likely to end up in
sentences with other colons so I'd rather use something is wrong at
Using the 'include' keyword in postgresql.conf let's us do groovy things
like paste together pieces of general purpose configs into the working file.
-- But since all we can do is set/reset the parameters the possibility
of concatenating fragments that use some of the list parameters won't
On 4 August 2014 19:30, Claudio Freire klaussfre...@gmail.com wrote:
On Mon, Aug 4, 2014 at 5:15 AM, Gabriele Bartolini
gabriele.bartol...@2ndquadrant.it wrote:
I really like the proposal of working on a block level incremental
backup feature and the idea of considering LSN. However, I'd
On Sat, Aug 2, 2014 at 6:58 PM, Peter Geoghegan p...@heroku.com wrote:
On Sat, Aug 2, 2014 at 2:45 AM, Peter Geoghegan p...@heroku.com wrote:
I'll post something over the weekend.
Attached is a cumulative pair of patches generated using
git-format-patch. I refer anyone who wants to know how
On Tue, Aug 5, 2014 at 12:03 PM, Robert Haas robertmh...@gmail.com wrote:
...but I'm wondering what underlies that decision. I would
understand the decision to go that way if it simplified things
elsewhere, but in fact it seems that's what underlies the addition of
ssup_operator to
On Tue, Aug 5, 2014 at 12:03 PM, Robert Haas robertmh...@gmail.com wrote:
and if some opclass other than text wants to
provide a sortsupport shim that supplies a comparator only sometimes,
it will need its own copy of the logic.
That's true, but my proposal to do things that way reflects the
On Sun, Aug 3, 2014 at 3:29 PM, Gavin Flower
gavinflo...@archidevsys.co.nz wrote:
So it would probably be a good idea to mention in the relevant
documentation, that there was no Year Zero, and that 1 AD follows directly
after 1 BC.
Well, maybe. By and large, the PostgreSQL documentation
On Tue, Aug 5, 2014 at 3:15 PM, Peter Geoghegan p...@heroku.com wrote:
On Tue, Aug 5, 2014 at 12:03 PM, Robert Haas robertmh...@gmail.com wrote:
and if some opclass other than text wants to
provide a sortsupport shim that supplies a comparator only sometimes,
it will need its own copy of the
On Mon, Aug 4, 2014 at 5:20 AM, Fabien COELHO coe...@cri.ensmp.fr wrote:
This patch is pretty trivial.
Another slightly less trivial but more useful version.
The issue is that there are 3 definitions of modulo, two of which are fine
(Knuth floored division and Euclidian), and the last one
On Mon, Aug 4, 2014 at 10:38 AM, Heikki Linnakangas
hlinnakan...@vmware.com wrote:
Now that we use TAP for testing client tools, I think we can use that to
test various SSL options too. I came up with the attached. Comments?
It currently assumes that the client's and the server's hostnames are
On Mon, Aug 4, 2014 at 11:35 AM, Manuel Kniep m.kn...@web.de wrote:
I’m missing the PG_RETURN_UINT16 macro in fmgr.h
Since we already have the PG_GETARG_UINT16 macro
I guess it makes sense to to have it.
here is the trivial patch for it.
I see no reason not to add this. Anyone else want to
On 08/05/2014 11:12 AM, Jerry Sievers wrote:
shared_preload_libraries += auto_explain
Would do the trick.
I've never heard this mentioned before so presume not many have
contemplated this.
It's been discussed.
However, other than shared_preload_libraries, I can't think of a GUC
which
On Tue, Aug 5, 2014 at 12:33 PM, Robert Haas robertmh...@gmail.com wrote:
Per your other email, here's the patch again; hopefully I've got the
right stuff in the file this time.
Your patch looks fine to me. I recommend committing patch 1 with these
additions. I can't think of any reason to
On Tue, Aug 5, 2014 at 12:52:51PM -0700, Josh Berkus wrote:
On 08/05/2014 11:12 AM, Jerry Sievers wrote:
shared_preload_libraries += auto_explain
Would do the trick.
I've never heard this mentioned before so presume not many have
contemplated this.
It's been discussed.
On Tue, Aug 5, 2014 at 3:23 PM, Simon Riggs si...@2ndquadrant.com wrote:
On 4 August 2014 19:30, Claudio Freire klaussfre...@gmail.com wrote:
On Mon, Aug 4, 2014 at 5:15 AM, Gabriele Bartolini
gabriele.bartol...@2ndquadrant.it wrote:
I really like the proposal of working on a block level
Robert Haas wrote:
On Mon, Aug 4, 2014 at 5:20 AM, Fabien COELHO coe...@cri.ensmp.fr wrote:
This patch is pretty trivial.
Another slightly less trivial but more useful version.
The issue is that there are 3 definitions of modulo, two of which are fine
(Knuth floored division and
Bruce Momjian wrote:
On Tue, Aug 5, 2014 at 12:52:51PM -0700, Josh Berkus wrote:
On 08/05/2014 11:12 AM, Jerry Sievers wrote:
shared_preload_libraries += auto_explain
Would do the trick.
I've never heard this mentioned before so presume not many have
contemplated this.
On Tue, Aug 5, 2014 at 9:35 AM, Robert Haas robertmh...@gmail.com wrote:
On Sat, Aug 2, 2014 at 9:15 AM, Daniele Varrazzo
daniele.varra...@gmail.com wrote:
I'd definitely replace /arg/argument/. Furthermore I'd avoid the form
argument 1: something is wrong: the string is likely to end up in
On Tue, Aug 5, 2014 at 12:33 PM, Robert Haas robertmh...@gmail.com wrote:
I'm also not sure it won't come up again. There are certainly other
text-like datatypes out there that might want to optimize sorts; e.g.
citext.
Fair enough. Actually, come to think of it I find BpChar/character(n)
a
On Thu, Jul 10, 2014 at 06:38:26PM -0400, Bruce Momjian wrote:
On Thu, Jul 10, 2014 at 06:17:14PM -0400, Bruce Momjian wrote:
Well, we are going to need to call internal C functions, often bypassing
their typical call sites and the assumption about locking, etc. Perhaps
this could be done
Alvaro Herrera-9 wrote
Bruce Momjian wrote:
On Tue, Aug 5, 2014 at 12:52:51PM -0700, Josh Berkus wrote:
On 08/05/2014 11:12 AM, Jerry Sievers wrote:
shared_preload_libraries += auto_explain
Would do the trick.
I've never heard this mentioned before so presume not many have
On 08/05/2014 04:41 PM, Alvaro Herrera wrote:
I have chosen to keep the name minmax, even if the opclasses now let
one implement completely different things on top of it such as geometry
bounding boxes and bloom filters (aka bitmap indexes). I don't see a
need for a rename: essentially, in PR
On 5 August 2014 22:38, Claudio Freire klaussfre...@gmail.com wrote:
* When we take an incremental backup we need the WAL from the backup
start LSN through to the backup stop LSN. We do not need the WAL
between the last backup stop LSN and the new incremental start LSN.
That is a huge amount
There was some informal discussion of worst case performance of my
text sort support patch at the most recent developer's meeting in
Ottawa. There is no need to repeat the details here, which aren't
terribly interesting - I made a point about putting worst case
performance in context. I also made
On Wed, Aug 6, 2014 at 9:04 AM, Simon Riggs si...@2ndquadrant.com wrote:
On 5 August 2014 22:38, Claudio Freire klaussfre...@gmail.com wrote:
Thinking some more, there seems like this whole store-multiple-LSNs
thing is too much. We can still do block-level incrementals just by
using a single
2014-08-05 22:08 GMT+08:00 土卜皿 pengcz.n...@gmail.com:
hi, all
I already can debug general postgres using ddd and select
pg_backend_pid(); , now, I want to study the details of the system
catalog cache and system cache management, so I need to debug the function
InitPostgres() and
Bruce Momjian br...@momjian.us writes:
On Tue, Aug 5, 2014 at 12:52:51PM -0700, Josh Berkus wrote:
However, other than shared_preload_libraries, I can't think of a GUC
which would benefit from this. Can you?
search_path?
Given the security implications of search_path, assembling its value
David G Johnston wrote:
Alvaro Herrera-9 wrote
I think this merits a new GUC flag, say GUC_LIST_ADDITIVE.
Would that allow, without any special syntax, multiple declarations of, say,
shared_preload_libraries, to have their values appended instead of the most
(or least, I forget which)
On Tue, Aug 5, 2014 at 9:17 PM, Michael Paquier
michael.paqu...@gmail.com wrote:
On Wed, Aug 6, 2014 at 9:04 AM, Simon Riggs si...@2ndquadrant.com wrote:
On 5 August 2014 22:38, Claudio Freire klaussfre...@gmail.com wrote:
Thinking some more, there seems like this whole store-multiple-LSNs
On Tue, Aug 5, 2014 at 9:04 PM, Simon Riggs si...@2ndquadrant.com wrote:
On 5 August 2014 22:38, Claudio Freire klaussfre...@gmail.com wrote:
* When we take an incremental backup we need the WAL from the backup
start LSN through to the backup stop LSN. We do not need the WAL
between the last
On 08/05/2014 06:25 PM, Alvaro Herrera wrote:
I'm not sold on += as the syntax to use. It just needs to be something
different from =.
Alternative is to use + in the value string:
shared_preload_libraries = '+auto_explain'
... not sure that's better.
The alternative is to add an append
Josh Berkus j...@agliodbs.com writes:
BTW, while there's unlikely to be a good reason to put search_path in
pg.conf with appends, there are a LOT of reasons to want to be able to
append to it during a session.
[shrug...] You can do that today with current_setting()/set_config().
On Wed, Aug 6, 2014 at 09:17:35AM +0900, Michael Paquier wrote:
On Wed, Aug 6, 2014 at 9:04 AM, Simon Riggs si...@2ndquadrant.com wrote:
On 5 August 2014 22:38, Claudio Freire klaussfre...@gmail.com wrote:
Thinking some more, there seems like this whole store-multiple-LSNs
thing is too
On Tue, Aug 5, 2014 at 06:36:01PM -0700, Josh Berkus wrote:
On 08/05/2014 06:25 PM, Alvaro Herrera wrote:
I'm not sold on += as the syntax to use. It just needs to be something
different from =.
Alternative is to use + in the value string:
shared_preload_libraries = '+auto_explain'
On Tue, Aug 5, 2014 at 07:22:13PM -0600, Tom Lane wrote:
Bruce Momjian br...@momjian.us writes:
On Tue, Aug 5, 2014 at 12:52:51PM -0700, Josh Berkus wrote:
However, other than shared_preload_libraries, I can't think of a GUC
which would benefit from this. Can you?
search_path?
I've looked at another (admittedly sympathetic) dataset that is
publicly available: the flickr tags dataset [1]. I end up with a
single table of tags; it's a large enough table, at 388 MB, but the
tuples are not very wide. There are 7,656,031 tags/tuples.
Predictably enough, this query is very
FWIW I think I haven't responded appropriately to the points raised by
Heikki. Basically, as I see it there are three main items:
1. the revmap physical-to-logical mapping is too complex; let's use
something else.
We had revmap originally in a separate fork. The current approach grew
out of
土卜皿 wrote:
2014-08-05 22:08 GMT+08:00 土卜皿 pengcz.n...@gmail.com:
hi, all
I already can debug general postgres using ddd and select
pg_backend_pid(); , now, I want to study the details of the system
catalog cache and system cache management, so I need to debug the function
On Tue, Aug 5, 2014 at 10:55 PM, Tom Lane t...@sss.pgh.pa.us wrote:
Josh Berkus j...@agliodbs.com writes:
BTW, while there's unlikely to be a good reason to put search_path in
pg.conf with appends, there are a LOT of reasons to want to be able to
append to it during a session.
[shrug...]
On Tue, Aug 05, 2014 at 07:32:35PM -0700, Peter Geoghegan wrote:
select * from (select * from tags order by tag offset 1) ii;
Git master takes about 25 seconds to execute the query. Patched takes
about 6.8 seconds. That seems very good, but this is not really new
information.
On Tue, Aug 5, 2014 at 8:55 PM, Noah Misch n...@leadboat.com wrote:
Comparator cost affects external sorts more than it affects internal sorts.
When I profiled internal and external int4 sorting, btint4cmp() was 0.37% of
the internal sort profile and 10.26% of the external sort profile.
Did
On Tue, Aug 05, 2014 at 09:32:59PM -0700, Peter Geoghegan wrote:
On Tue, Aug 5, 2014 at 8:55 PM, Noah Misch n...@leadboat.com wrote:
Comparator cost affects external sorts more than it affects internal sorts.
When I profiled internal and external int4 sorting, btint4cmp() was 0.37% of
the
I have improved the patch by making following changes:
1. Since stream_stop() was redundant, stream_stop() at the time of
WAL file closing was deleted.
2. Change the Flash judging timing for the readability of source code.
I have changed the Flash judging timing , from the
On 6 August 2014 03:16, Bruce Momjian br...@momjian.us wrote:
On Wed, Aug 6, 2014 at 09:17:35AM +0900, Michael Paquier wrote:
On Wed, Aug 6, 2014 at 9:04 AM, Simon Riggs si...@2ndquadrant.com wrote:
On 5 August 2014 22:38, Claudio Freire klaussfre...@gmail.com wrote:
Thinking some more,
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