On 18.03.2011 13:56, Heikki Linnakangas wrote:
On 18.03.2011 10:48, Heikki Linnakangas wrote:
On 17.03.2011 21:39, Robert Haas wrote:
On Mon, Jan 31, 2011 at 10:45 PM, Fujii Masaomasao.fu...@gmail.com
wrote:
On Tue, Feb 1, 2011 at 1:31 AM, Heikki Linnakangas
On Fri, Mar 18, 2011 at 11:55 PM, Josh Berkus j...@agliodbs.com wrote:
To take the opposite approach... has anyone looked at having the OS just
manage all caching for us? Something like MMAPed shared buffers? Even if we
find the issue with large shared buffers, we still can't dedicate serious
On 21.03.2011 07:40, Piyush Newe wrote:
On Thu, Mar 17, 2011 at 7:56 PM, Tom Lanet...@sss.pgh.pa.us wrote:
Robert Haasrobertmh...@gmail.com writes:
On Thu, Mar 17, 2011 at 9:46 AM, Alvaro Herrera
alvhe...@commandprompt.com wrote:
Keep in mind that the datetime stuff was abandoned by the
Hi list,
When I have fields with lots of null values, I often create indexes
like this: CREATE INDEX foo_i ON foo(i) WHERE i IS NOT NULL;
This saves me some space, as most indexed queries exclude NULLs anyway.
In PostgreSQL 9.0.3, min(i) can successfully use this index:
---
marti=#
Hi all,
I have been trying to work on the expression evaluator (trying to alter
it just for the seqscan case). I have understood a few things. I wish
someone could tell me if I am wrong at some point. As far as I have gone
through the code, I think:
1. Quals are formulated by planner
2. Quals
On 21.03.2011 13:44, Vaibhav Kaushal wrote:
Hi all,
I have been trying to work on the expression evaluator (trying to alter
it just for the seqscan case). I have understood a few things. I wish
someone could tell me if I am wrong at some point. As far as I have gone
through the code, I think:
On Mon, Mar 21, 2011 at 5:47 PM, Heikki Linnakangas
heikki.linnakan...@enterprisedb.com wrote:
Yes. There's actually two trees involved. The planner produces a tree of
Expr nodes, and ExecInitExpr prepares a tree of ExprState nodes that mirrors
the first tree. The ExprStates contain run-time
On 21.03.2011 14:37, Vaibhav Kaushal wrote:
I am already using the postgresql server with -d 4 option and it shows a
lot of things. But I am not able to see the Expression State trees.
To be precise, debug_print_plan=on prints the expression tree that comes
from planner, not the execution
On Mon, Mar 21, 2011 at 7:17 AM, Marti Raudsepp ma...@juffo.org wrote:
Hi list,
When I have fields with lots of null values, I often create indexes
like this: CREATE INDEX foo_i ON foo(i) WHERE i IS NOT NULL;
This saves me some space, as most indexed queries exclude NULLs anyway.
In
On Mon, Mar 21, 2011 at 6:24 AM, Heikki Linnakangas
heikki.linnakan...@enterprisedb.com wrote:
Having said that, it's not entirely clear to me what sane behavior is
here. Personally I would expect that an n-Ys format spec would consume
at most n digits from the input. Otherwise how are you
Robert Haas robertmh...@gmail.com writes:
On Mon, Mar 21, 2011 at 6:24 AM, Heikki Linnakangas
heikki.linnakan...@enterprisedb.com wrote:
Having said that, it's not entirely clear to me what sane behavior is
here. Personally I would expect that an n-Ys format spec would consume
at most n
On Mon, Mar 21, 2011 at 9:57 AM, Tom Lane t...@sss.pgh.pa.us wrote:
Robert Haas robertmh...@gmail.com writes:
On Mon, Mar 21, 2011 at 6:24 AM, Heikki Linnakangas
heikki.linnakan...@enterprisedb.com wrote:
Having said that, it's not entirely clear to me what sane behavior is
here. Personally
Robert Haas robertmh...@gmail.com writes:
On Mon, Mar 21, 2011 at 9:57 AM, Tom Lane t...@sss.pgh.pa.us wrote:
What I was thinking was that would take either 2 or 4 digits.
Whatever you do here, the year will have to be delimited by a non-digit
for such cases to be parseable.
I was
Robert Haas robertmh...@gmail.com writes:
On Mon, Mar 21, 2011 at 7:17 AM, Marti Raudsepp ma...@juffo.org wrote:
I know that the Merge Append patch required some changes in the
min/max optimization, which is probably the cause.
Yeah, I think this is a direct result of commit
Hello，
Thank you for reading my question!
Lately，I‘am reading PostgreSQL’s source code！ As I understand，the PLs
module（such as pl/pgSQL）allow user-defined functions to be writter in other
languages.
AS postgresql-9.0-document.pdf says :For a function written in a
On Mon, 21 Mar 2011 10:24:22 +, Greg Stark wrote:
On Fri, Mar 18, 2011 at 11:55 PM, Josh Berkus j...@agliodbs.com
wrote:
To take the opposite approach... has anyone looked at having the OS
just manage all caching for us? Something like MMAPed shared buffers?
Even if we find the issue with
On Mon, Mar 21, 2011 at 10:25 AM, Tom Lane t...@sss.pgh.pa.us wrote:
Robert Haas robertmh...@gmail.com writes:
On Mon, Mar 21, 2011 at 7:17 AM, Marti Raudsepp ma...@juffo.org wrote:
I know that the Merge Append patch required some changes in the
min/max optimization, which is probably the
On Mon, Mar 21, 2011 at 10:18 AM, Tom Lane t...@sss.pgh.pa.us wrote:
Robert Haas robertmh...@gmail.com writes:
On Mon, Mar 21, 2011 at 9:57 AM, Tom Lane t...@sss.pgh.pa.us wrote:
What I was thinking was that would take either 2 or 4 digits.
Whatever you do here, the year will have to be
On Mon, Mar 21, 2011 at 5:24 AM, Greg Stark gsst...@mit.edu wrote:
On Fri, Mar 18, 2011 at 11:55 PM, Josh Berkus j...@agliodbs.com wrote:
To take the opposite approach... has anyone looked at having the OS just
manage all caching for us? Something like MMAPed shared buffers? Even if we
find
On 21.03.2011 17:54, Merlin Moncure wrote:
Can't you make just one large mapping and lock it in 8k regions? I
thought the problem with mmap was not being able to detect other
processes
(http://www.mail-archive.com/pgsql-general@postgresql.org/msg122301.html)
compatibility issues (possibly
Robert Haas wrote:
Tom Lane wrote:
I don't think that suppressing nulls from an index this way is
really very useful. Using a partial index probably eats more
planner cycles than you'll save, overall.
If only 1% of the table has non-NULL values in that column, maybe
not.
We
On 2011-03-21 02:05, Robert Haas wrote:
On Sun, Mar 20, 2011 at 11:03 AM, Yeb Havingayebhavi...@gmail.com wrote:
On 2011-03-20 05:44, Robert Haas wrote:
Hmm, I'm not going to be able to reproduce this here, and my test
setup didn't show a clear regression. I can try beating on it some
more,
of digits, not more.
Yeah, I thought about that, but it seems that use case is already
hopelessly broken in both PostgreSQL and Oracle, so I'm disinclined to
worry about it.
How so?
regression=# select to_date('20110321', 'MMDD');
to_date
2011-03-21
(1 row)
regression
On 3/21/11 3:24 AM, Greg Stark wrote:
2-level caches work well for a variety of applications.
I think 2-level caches with simple heuristics like pin all the
indexes is unlikely to be helpful. At least it won't optimize the
average case and I think that's been proven. It might be helpful for
-digit delimiters and
so you have to take exactly the specified number of digits, not more.
Yeah, I thought about that, but it seems that use case is already
hopelessly broken in both PostgreSQL and Oracle, so I'm disinclined to
worry about it.
How so?
regression=# select to_date('20110321
Attached is a single-line patch to add a missing semicolon to gram.y; caught
using yyextract.
Regards,
--
Gurjeet Singh
EnterpriseDB Corporation
The Enterprise PostgreSQL Company
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index d32e480..44c4fd6 100644
---
Kevin Grittner kevin.gritt...@wicourts.gov writes:
Robert Haas wrote:
Tom Lane wrote:
I don't think that suppressing nulls from an index this way is
really very useful. Using a partial index probably eats more
planner cycles than you'll save, overall.
If only 1% of the table has non-NULL
On Mon, Mar 21, 2011 at 12:29 PM, Yeb Havinga yebhavi...@gmail.com wrote:
pgbench -i -s 50 test
Two runs of pgbench -c 10 -M prepared -T 600 test with 1 sync standby -
server configs etc were mailed upthread.
- performance as of commit e148443ddd95cd29edf4cc1de6188eb9cee029c5
1158 and 1306
So it's a clever hack that we used to allow the partial indexes to be
used. It relied on the implicit assumption that min(x) and max(x)
where the only values of x where NULL were both NULL.
It would be nice if we were clever enough to support *any* strict
aggregate using partial indexes on WHERE
Greg Stark gsst...@mit.edu writes:
So it's a clever hack that we used to allow the partial indexes to be
used. It relied on the implicit assumption that min(x) and max(x)
where the only values of x where NULL were both NULL.
It would be nice if we were clever enough to support *any* strict
It stroke me today again, that \dt+ isn't displaying the acurate table size
for tables, since it uses pg_relation_size() till now. With having
pg_table_size() since PostgreSQL 9.0 available, i believe it would be more
useful to have the total acquired storage displayed, including implicit
Gurjeet Singh singh.gurj...@gmail.com writes:
Attached is a single-line patch to add a missing semicolon to gram.y; caught
using yyextract.
Done some time ago ...
http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=a051ef699c3ed1f89088dd6bbc2574f13d0b20eb#patch16
On 2011-03-21 18:04, Robert Haas wrote:
On Mon, Mar 21, 2011 at 12:29 PM, Yeb Havingayebhavi...@gmail.com wrote:
pgbench -i -s 50 test
Two runs of pgbench -c 10 -M prepared -T 600 test with 1 sync standby -
server configs etc were mailed upthread.
- performance as of commit
On Mon, Mar 21, 2011 at 3:54 PM, Merlin Moncure mmonc...@gmail.com wrote:
Can't you make just one large mapping and lock it in 8k regions? I
thought the problem with mmap was not being able to detect other
processes
(http://www.mail-archive.com/pgsql-general@postgresql.org/msg122301.html)
On Mon, Mar 21, 2011 at 4:47 PM, Josh Berkus j...@agliodbs.com wrote:
You're missing my point ... Postgres already *has* a 2-level cache:
shared_buffers and the FS cache. Anything we add to that will be adding
levels.
I don't think those two levels are interesting -- they don't interact
On Mon, Mar 21, 2011 at 5:40 PM, Tom Lane t...@sss.pgh.pa.us wrote:
Greg Stark gsst...@mit.edu writes:
So it's a clever hack that we used to allow the partial indexes to be
used. It relied on the implicit assumption that min(x) and max(x)
where the only values of x where NULL were both NULL.
I just received a feedback from our bug report about this problem and
it seems the problem also occurred on a windows machine.
http://pgfoundry.org/tracker/index.php?func=detailaid=1010988group_id=1000140atid=590
On Sat, Mar 19, 2011 at 14:13, Marko Kreen mark...@gmail.com wrote:
On Sat, Mar
On windows, if you have OS locale set to Chinese (Simplified, PRC),
initdb fails:
X:\C:\pgsql-install\bin\initdb.exe -D data2
The files belonging to this database system will be owned by user Heikki.
This user must also own the server process.
The database cluster will be initialized with
Excerpts from Josh Berkus's message of lun mar 21 13:47:21 -0300 2011:
We already did that, actually, when we implemented ARC: effectively gave
PostgreSQL a 3-level cache. The results were not very good, although
the algorithm could be at fault there.
Was it really all that bad? IIRC we
Greg Stark gsst...@mit.edu writes:
On Mon, Mar 21, 2011 at 5:40 PM, Tom Lane t...@sss.pgh.pa.us wrote:
For general aggregates, you
have to scan the table anyway. If an index is useful for that, it'll
get picked up in the normal planning process.
if I do SELECT count(col) from tab with no
Was it really all that bad? IIRC we replaced ARC with the current clock
sweep due to patent concerns. (Maybe there were performance concerns as
well, I don't remember).
Yeah, that was why the patent was frustrating. Performance was poor and
we were planning on replacing ARC in 8.2 anyway.
On Mon, Mar 21, 2011 at 2:08 PM, Greg Stark gsst...@mit.edu wrote:
On Mon, Mar 21, 2011 at 3:54 PM, Merlin Moncure mmonc...@gmail.com wrote:
Can't you make just one large mapping and lock it in 8k regions? I
thought the problem with mmap was not being able to detect other
processes
On Mon, Mar 21, 2011 at 7:29 PM, Heikki Linnakangas
heikki.linnakan...@enterprisedb.com wrote:
On windows, if you have OS locale set to Chinese (Simplified, PRC), initdb
fails:
X:\C:\pgsql-install\bin\initdb.exe -D data2
The files belonging to this database system will be owned by user
On Mar 16, 2011, at 7:44 PM, Robert Haas wrote:
It
would be really nice (for this and for other things) if we had some
way of measuring the I/O saturation of the system, so that we could
automatically adjust the aggressiveness of background processes
accordingly.
Has anyone looked at the
Merlin Moncure mmonc...@gmail.com Monday 21 March 2011 20:58:16
On Mon, Mar 21, 2011 at 2:08 PM, Greg Stark gsst...@mit.edu wrote:
On Mon, Mar 21, 2011 at 3:54 PM, Merlin Moncure mmonc...@gmail.com
wrote:
Can't you make just one large mapping and lock it in 8k regions? I
thought the
On Mon, Mar 21, 2011 at 7:51 PM, Yeb Havinga yebhavi...@gmail.com wrote:
On 2011-03-21 18:04, Robert Haas wrote:
On Mon, Mar 21, 2011 at 12:29 PM, Yeb Havingayebhavi...@gmail.com
wrote:
pgbench -i -s 50 test
Two runs of pgbench -c 10 -M prepared -T 600 test with 1 sync standby -
server
I wrote:
Hmm. We could possibly fix this by having planagg.c do a completely
separate planner run for each aggregate, wherein it actually does build
the equivalent query
SELECT col FROM tab WHERE existing-quals AND col IS NOT NULL
ORDER BY col ASC/DESC LIMIT 1
and plan that.
Heikki Linnakangas heikki.linnakan...@enterprisedb.com writes:
Any objections to the 2nd attached patch, which adds the mapping of
those locale names on Windows?
I think the added initdb message isn't following our style guidelines
--- it certainly doesn't match the adjacent existing message.
+1 for fixing this behavior in 9.1. -1 for changing in 9.0, as the
change in behavior mid-release will cause more confusion than the
incomplete accounting does.
Cheers,
David.
On Mon, Mar 21, 2011 at 06:44:51PM +0100, Bernd Helmle wrote:
It stroke me today again, that \dt+ isn't displaying the
On Mon, Mar 21, 2011 at 6:08 PM, Jim Nasby j...@nasby.net wrote:
Has anyone looked at the overhead of measuring how long IO requests to the
kernel take? If we did that not only could we get an idea of what our IO
workload looked like, we could also figure out whether a block came out of
On Mon, 2011-03-14 at 16:08 +, Dave Page wrote:
Please count me in as a mentor for a GUI project. It is an open
source
dashboard for PostgreSQL DBAs, called ADJ Dashboard.
I can't find any info on that via Google. URL please?
Erdinc said that he will setup a web page for this, and
Hi,
You said:
ExecMakeFunctionResultNoSets is used to evaluate function calls.
What are the 'functions' there? Are they the user supplied pl/PGSQL style
user functions, the functions handled by fmgr or are they just another C
function which make the Expression Evaluator?
Regards,
Vaibhav
On Tue, Mar 22, 2011 at 4:35 AM, Tom Lane t...@sss.pgh.pa.us wrote:
Reimplement planner's handling of MIN/MAX aggregate optimization (again).
I'm just curious, Why is this no longer an interesting special case?
--- this is an interesting special case as of 9.1
-explain (costs off)
- select
Greg Stark gsst...@mit.edu writes:
On Tue, Mar 22, 2011 at 4:35 AM, Tom Lane t...@sss.pgh.pa.us wrote:
Reimplement planner's handling of MIN/MAX aggregate optimization (again).
I'm just curious, Why is this no longer an interesting special case?
--- this is an interesting special case as of
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