On 2011-02-03 22:48, Scott Marlowe wrote:
On Thu, Feb 3, 2011 at 8:40 PM, Greg Smithg...@2ndquadrant.com wrote:
Scott Marlowe wrote:
Yes they're useful, but like a plastic bad covering a broken car window,
they're useful because they cover something that's inherently broken.
Awesome. Now
On 02/04/2011 02:32 AM, da...@lang.hm wrote:
when a copy command is issued, I assume that there is some indication
of how much data is going to follow.
No of course there isn't. How would we do that with a stream like STDIN?
Read the code.
cheers
andrew
--
Sent via
Informix IDS supports hints as well; normally the only need for hints in
this engine is when the Table/Index statistics are not being updated on a
regular basis (ie: lazy DBA).
On 3 February 2011 22:17, Mark Kirkwood mark.kirkw...@catalyst.net.nzwrote:
On 04/02/11 11:08, Josh Berkus wrote:
I
Mark Mielke m...@mark.mielke.cc writes:
My understanding is:
1) Background daemon wakes up and checks whether a number of changes
have happened to the database, irrelevant of transaction boundaries.
2) Background daemon analyzes a percentage of rows in the database for
statistical data,
On Fri, Feb 4, 2011 at 11:37 PM, Robert Haas robertmh...@gmail.com wrote:
On Sat, Feb 5, 2011 at 12:46 AM, da...@lang.hm wrote:
Actually for me the main con with streaming analyze is that it adds
significant CPU burden to already not too fast load process. Especially if
it's automatically
Scott Marlowe wrote:
With a 24 drive RAID-10 array that can read at ~1GB/s I am almost
always CPU bound during copies. This isn't wholly bad as it leaves
spare IO for the rest of the machine so regular work carries on just
fine.
And you don't need nearly that much I/O bandwidth to reach
Mladen Gogala schrieb:
Well, the problem will not go away. As I've said before, all other
databases have that feature and none of the reasons listed here
convinced me that everybody else has a crappy optimizer. The problem
may go away altogether if people stop using PostgreSQL.
A common
Yes. And this has little to do with hints. It has to do with years
of development lead with THOUSANDS of engineers who can work on the
most esoteric corner cases in their spare time. Find the pg project a
couple hundred software engineers and maybe we'll catch Oracle a
little quicker.
On Thu, Feb 03, 2011 at 04:39:12PM -0800, da...@lang.hm wrote:
On Thu, 3 Feb 2011, Robert Haas wrote:
On Thu, Feb 3, 2011 at 3:54 PM, da...@lang.hm wrote:
with the current code, this is a completely separate process that knows
nothing about the load, so if you kick it off when you start the
04.02.11 16:33, Kenneth Marshall написав(ла):
In addition, the streaming ANALYZE can provide better statistics at
any time during the load and it will be complete immediately. As far
as passing the entire table through the ANALYZE process, a simple
counter can be used to only send the required
On Thu, Feb 03, 2011 at 09:05:52PM -0500, Robert Haas wrote:
On Thu, Feb 3, 2011 at 8:37 PM, da...@lang.hm wrote:
On Thu, 3 Feb 2011, Robert Haas wrote:
On Thu, Feb 3, 2011 at 7:39 PM, ?da...@lang.hm wrote:
Yeah, but you'll be passing the entire table through this separate
process
On Fri, Feb 4, 2011 at 6:05 AM, Grant Johnson gr...@amadensor.com wrote:
Yes. And this has little to do with hints. It has to do with years
of development lead with THOUSANDS of engineers who can work on the
most esoteric corner cases in their spare time. Find the pg project a
couple
On Fri, Feb 4, 2011 at 9:38 AM, Vitalii Tymchyshyn tiv...@gmail.com wrote:
Actually for me the main con with streaming analyze is that it adds
significant CPU burden to already not too fast load process.
Exactly.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise
Greg Smith wrote:
Check out
http://www.indeed.com/jobtrends?q=postgres%2C+mysql%2C+oraclerelative=1relative=1
if you want to see the real story here. Oracle has a large installed
base, but it's considered a troublesome legacy product being replaced
+1 for Oracle being a troublesome
Mladen Gogala wrote:
Chris Browne wrote:
Well, the community declines to add hints until there is actual
consensus on a good way to add hints.
OK. That's another matter entirely. Who should make that decision? Is
there a committee or a person who would be capable of making that
Mladen Gogala wrote:
Actually, it is not unlike a religious dogma, only stating that hints
are bad. It even says so in the wiki. The arguments are
1) Refusal to implement hints is motivated by distrust toward users,
citing that some people may mess things up.
Yes, they can, with and
On Fri, Feb 4, 2011 at 5:17 PM, Bruce Momjian br...@momjian.us wrote:
Mladen Gogala wrote:
characteristic of a religious community chastising a sinner. Let me
remind you again: all other major databases have that possibility:
Oracle, MySQL, DB2, SQL Server and Informix. Requiring burden of
On Fri, 4 Feb 2011, Vitalii Tymchyshyn wrote:
04.02.11 16:33, Kenneth Marshall ???(??):
In addition, the streaming ANALYZE can provide better statistics at
any time during the load and it will be complete immediately. As far
as passing the entire table through the ANALYZE process, a
On Sat, Feb 5, 2011 at 12:46 AM, da...@lang.hm wrote:
Actually for me the main con with streaming analyze is that it adds
significant CPU burden to already not too fast load process. Especially if
it's automatically done for any load operation performed (and I can't see
how it can be enabled
02.02.11 20:32, Robert Haas написав(ла):
Yeah. Any kind of bulk load into an empty table can be a problem,
even if it's not temporary. When you load a bunch of data and then
immediately plan a query against it, autoanalyze hasn't had a chance
to do its thing yet, so sometimes you get a lousy
On Thu, 3 Feb 2011, Vitalii Tymchyshyn wrote:
02.02.11 20:32, Robert Haas ???(??):
Yeah. Any kind of bulk load into an empty table can be a problem,
even if it's not temporary. When you load a bunch of data and then
immediately plan a query against it, autoanalyze hasn't had a chance
to
On Thu, Feb 03, 2011 at 02:11:58AM -0800, da...@lang.hm wrote:
On Thu, 3 Feb 2011, Vitalii Tymchyshyn wrote:
02.02.11 20:32, Robert Haas ???(??):
Yeah. Any kind of bulk load into an empty table can be a problem,
even if it's not temporary. When you load a bunch of data and then
On Thu, Feb 3, 2011 at 7:41 AM, Kenneth Marshall k...@rice.edu wrote:
On Thu, Feb 03, 2011 at 02:11:58AM -0800, da...@lang.hm wrote:
On Thu, 3 Feb 2011, Vitalii Tymchyshyn wrote:
02.02.11 20:32, Robert Haas ???(??):
Yeah. Any kind of bulk load into an empty table can be a problem,
even
On Thu, Feb 3, 2011 at 4:54 AM, Vitalii Tymchyshyn tiv...@gmail.com wrote:
02.02.11 20:32, Robert Haas написав(ла):
Yeah. Any kind of bulk load into an empty table can be a problem,
even if it's not temporary. When you load a bunch of data and then
immediately plan a query against it,
On Thu, Feb 3, 2011 at 5:11 AM, da...@lang.hm wrote:
If I am understanding things correctly, a full Analyze is going over all the
data in the table to figure out patterns.
No. It's going over a small, fixed-size sample which depends on
default_statistics_target but NOT on the table size.
03.02.11 17:31, Robert Haas написав(ла):
May be introducing something like 'AutoAnalyze' threshold will help? I mean
that any insert/update/delete statement that changes more then x% of table
(and no less then y records) must do analyze right after it was finished.
Defaults like x=50 y=1
Greg Smith wrote:
Mladen Gogala wrote:
The techies at big companies are the guys who will or will not make it
happen. And these guys are not beginners. Appeasing them may actually
go a long way.
The PostgreSQL community isn't real big on appeasing people if it's at
the expense of
Mladen Gogala wrote:
Greg Smith wrote:
Mladen Gogala wrote:
The techies at big companies are the guys who will or will not make it
happen. And these guys are not beginners. Appeasing them may actually
go a long way.
The PostgreSQL community isn't real big on appeasing
Mladen Gogala wrote:
Hints are not even that complicated to program. The SQL parser should
compile the list of hints into a table and optimizer should check
whether any of the applicable access methods exist in the table. If it
does - use it. If not, ignore it. This looks to me like a
On 02/03/2011 10:38 AM, Mladen Gogala wrote:
With all due respect, I don't see how does the issue of hints fall
into this category?
You have a few good arguments, and if you hadn't said this, it wouldn't
have been so obvious that there was a fundamental philosophical
disconnect. I asked
Mladen Gogala mladen.gog...@vmsinfo.com writes:
Hints are not even that complicated to program.
With all due respect, you don't know what you're talking about.
regards, tom lane
--
Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
To make
On Thu, Feb 3, 2011 at 11:56 AM, Bruce Momjian br...@momjian.us wrote:
The settings are currently there to better model the real world
(random_page_cost), or for testing (enable_seqscan). They are not there
to force certain plans. They can be used for that, but that is not
their purpose and
Robert Haas robertmh...@gmail.com writes:
I don't, however, agree with his contention that this is easy to
implement. It would be easy to implement something that sucked. It
would be hard to implement something that actually helped in the cases
where the existing settings aren't already
mladen.gog...@vmsinfo.com (Mladen Gogala) writes:
Hints are not even that complicated to program. The SQL parser should
compile the list of hints into a table and optimizer should check
whether any of the applicable access methods exist in the table. If it
does - use it. If not, ignore it.
Mladen Gogala wrote:
With all due respect, I don't see how does the issue of hints fall
into this category? As I explained, the mechanisms are already there,
they're just not elegant enough.
You're making some assumptions about what a more elegant mechanism would
look to develop that are
Chris Browne wrote:
It's worth looking back to what has already been elaborated on in the
ToDo.
And that precisely is what I am trying to contest.
--
Mladen Gogala
Sr. Oracle DBA
1500 Broadway
New York, NY 10036
(212) 329-5251
http://www.vmsinfo.com
The Leader in Integrated Media
On Thu, Feb 03, 2011 at 12:44:23PM -0500, Chris Browne wrote:
mladen.gog...@vmsinfo.com (Mladen Gogala) writes:
Hints are not even that complicated to program. The SQL parser should
compile the list of hints into a table and optimizer should check
whether any of the applicable access
On Thu, 3 Feb 2011, Robert Haas wrote:
On Thu, Feb 3, 2011 at 5:11 AM, da...@lang.hm wrote:
If I am understanding things correctly, a full Analyze is going over all the
data in the table to figure out patterns.
No. It's going over a small, fixed-size sample which depends on
Shaun Thomas wrote:
On 02/03/2011 10:38 AM, Mladen Gogala wrote:
It all boils down to the database. Hints, whether they're
well-intentioned or not, effectively cover up bugs in the optimizer,
planner, or some other approach the database is using to build its
execution.
Hints don't cover
mladen.gog...@vmsinfo.com (Mladen Gogala) writes:
I must say that this purist attitude is extremely surprising to
me. All the major DB vendors support optimizer hints, yet in the
Postgres community, they are considered bad with almost religious
fervor.
Postgres community is quite unique with
Mladen Gogala mladen.gog...@vmsinfo.com wrote:
In the meantime, the fire is burning. What should the hapless
owner of the database application do in the meantime? Tell the
users that it will be better in the next version? As I've said
before: hints are make it or break it point. Without
On 02/03/2011 03:01 PM, Mladen Gogala wrote:
As I hinted before, this is actually a purist argument which was made
by someone who has never had to support a massive production database
with many users for living.
Our database handles 9000 transactions per second and over 200-million
Chris Browne wrote:
Well, the community declines to add hints until there is actual
consensus on a good way to add hints.
OK. That's another matter entirely. Who should make that decision? Is
there a committee or a person who would be capable of making that decision?
Nobody has ever
On 04/02/11 10:01, Mladen Gogala wrote:
In the meantime, the fire is burning. What should the hapless owner of
the database application do in the meantime? Tell the users that it
will be better in the next version? As I've said before: hints are
make it or break it point. Without hints, I
Shaun Thomas wrote:
You missed the argument. The community, or at least the devs, see hints
as an ugly hack. Do I agree? Not completely, but I can definitely
understand the perspective. Saying every other vendor has hints is
really just admitting every other vendor has a crappy optimizer. Is
On Feb 3, 2011, at 1:50 PM, Mladen Gogala wrote:
So, I will have to go back on my decision to use Postgres and re-consider
MySQL? I will rather throw away the effort invested in studying Postgres than
to risk an unfixable application downtime. I am not sure about the world
domination
2011/2/3 Mladen Gogala mladen.gog...@vmsinfo.com:
Chris Browne wrote:
Well, the community declines to add hints until there is actual
consensus on a good way to add hints.
OK. That's another matter entirely. Who should make that decision? Is
there a committee or a person who would be
On 2/3/11 1:18 PM, Chris Browne wrote:
mladen.gog...@vmsinfo.com (Mladen Gogala) writes:
I must say that this purist attitude is extremely surprising to
me. All the major DB vendors support optimizer hints,
I don't think that's actually accurate. Can you give me a list of
DBMSes which support
In the meantime, the other databases provide hints which help me bridge the
gap. As I said before: hints are there, even if they were not meant to be
used that way. I can do things in a way that I consider very non-elegant.
The hints are there because they are definitely needed. Yet, there is
Josh Berkus wrote:
However, since this system wasn't directly compatible with Oracle Hints,
folks pushing for hints dropped the solution as unsatisfactory. This is
the discussion we have every time: the users who want hints specifically
want hints which work exactly like Oracle's, and aren't
Mladen Gogala wrote:
Actually, I don't want Oracle hints. Oracle hints are ugly and
cumbersome. I would prefer something like this:
http://dev.mysql.com/doc/refman/5.0/en/index-hints.html
That should also answer the question about other databases supporting hints.
Sorry. I forgot that
The hints are there because they are definitely needed. Yet, there is a
religious zeal and a fatwa against them.
The opposition is philosophical, not religious. There is no fatwa.
If you want a serious discussion, avoid inflammatory terms.
---
Maciek Sakrejda | System Architect | Truviso
1065
On 04/02/11 11:08, Josh Berkus wrote:
I don't think that's actually accurate. Can you give me a list of
DBMSes which support hints other than Oracle?
DB2 LUW (Linux, Unix, Win32 code base) has hint profiles:
http://justdb2chatter.blogspot.com/2008/06/db2-hints-optimizer-selection.html
--
da...@lang.hm wrote:
I am making the assumption that an Analyze run only has to go over the
data once (a seqential scan of the table if it's ram for example)
and gathers stats as it goes.
And that's the part there's some confusion about here. ANALYZE grabs a
random set of samples from the
Maciek Sakrejda wrote:
The hints are there because they are definitely needed. Yet, there is a
religious zeal and a fatwa against them.
The opposition is philosophical, not religious. There is no fatwa.
If you want a serious discussion, avoid inflammatory terms.
I don't want to
Mark Kirkwood wrote:
On 04/02/11 11:08, Josh Berkus wrote:
I don't think that's actually accurate. Can you give me a list of
DBMSes which support hints other than Oracle?
DB2 LUW (Linux, Unix, Win32 code base) has hint profiles:
On Feb 3, 2011, at 17:08, Josh Berkus wrote:
On 2/3/11 1:18 PM, Chris Browne wrote:
mladen.gog...@vmsinfo.com (Mladen Gogala) writes:
I must say that this purist attitude is extremely surprising to
me. All the major DB vendors support optimizer hints,
I don't think that's actually
I don't want to insult anybody but the whole thing does look strange.
Maybe we can agree to remove that ridiculous we don't want hints note
from Postgresql wiki? That would make it look less like , hmph,
philosophical issue and more not yet implemented issue, especially if
we have in mind
Mladen Gogala mladen.gog...@vmsinfo.com wrote:
Maybe we can agree to remove that ridiculous we don't want hints
note from Postgresql wiki?
I'd be against that. This is rehashed less frequently since that
went in. Less wasted time and bandwidth with it there.
That would make it look less
With all
due respect, I consider myself smarter than the optimizer. I'm 6'4, 235LBS
so telling me that you disagree and that I am more stupid than a computer
program, would not be a smart thing to do. Please, do not misunderestimate
me.
I don't see computer programs make thinly veiled
Thank you.
It appears I owe an apology also, for jumping to that conclusion. It
was rash and unfair of me. I am sorry.
On Wed, Feb 2, 2011 at 5:03 PM, Mladen Gogala mladen.gog...@vmsinfo.com wrote:
Justin Pitts wrote:
With all
due respect, I consider myself smarter than the optimizer. I'm
On 02/02/2011 07:17 PM, Greg Smith wrote:
I direct anyone who thought Mladen was making a serious comment to
http://www.nydailynews.com/news/politics/2009/01/08/2009-01-08_misunderestimate_tops_list_of_notable_bu-3.html
if you want to get his little joke there. I plan to start using
Josh Berkus wrote:
I don't want to insult anybody but the whole thing does look strange.
Maybe we can agree to remove that ridiculous we don't want hints note
from Postgresql wiki? That would make it look less like , hmph,
philosophical issue and more not yet implemented issue, especially if
we
On Thu, Feb 3, 2011 at 3:54 PM, da...@lang.hm wrote:
with the current code, this is a completely separate process that knows
nothing about the load, so if you kick it off when you start the load, it
makes a pass over the table (competing for I/O), finishes, you continue to
update the table,
Kevin Grittner wrote:
Mladen Gogala mladen.gog...@vmsinfo.com wrote:
Maybe we can agree to remove that ridiculous we don't want hints
note from Postgresql wiki?
I'd be against that. This is rehashed less frequently since that
went in. Less wasted time and bandwidth with it there.
On Thu, 2011-02-03 at 18:33 -0500, Mladen Gogala wrote:
Exactly what we don't want.
Who is we?
The majority of long term hackers.
--
PostgreSQL.org Major Contributor
Command Prompt, Inc: http://www.commandprompt.com/ - 509.416.6579
Consulting, Training, Support, Custom
On Thu, Feb 3, 2011 at 6:33 PM, Mladen Gogala mladen.gog...@vmsinfo.com wrote:
Kevin Grittner wrote:
Mladen Gogala mladen.gog...@vmsinfo.com wrote:
Maybe we can agree to remove that ridiculous we don't want hints
note from Postgresql wiki?
I'd be against that. This is rehashed less
Joshua D. Drake wrote:
On Thu, 2011-02-03 at 18:33 -0500, Mladen Gogala wrote:
Exactly what we don't want.
Who is we?
The majority of long term hackers.
If that is so, I don't see world domination in the future, exactly
the opposite. Database whose
On 2/3/11 1:34 PM, Shaun Thomas wrote:
I must say that this purist attitude is extremely surprising to me.
All the major DB vendors support optimizer hints, yet in the
Postgres community, they are considered bad with almost religious
fervor. Postgres community is quite unique with the fatwa
All other databases do have that feature. I must say, this
debate gave me a good deal of stuff to think about.
And, I think we're done here. The idea that the lack of hints will kill
PostgreSQL is already demonstrably false. This is sounding more and
more like a petulant tantrum.
Folks, I
On Thu, 3 Feb 2011, Robert Haas wrote:
On Thu, Feb 3, 2011 at 3:54 PM, da...@lang.hm wrote:
with the current code, this is a completely separate process that knows
nothing about the load, so if you kick it off when you start the load, it
makes a pass over the table (competing for I/O),
Robert Haas wrote:
On Thu, Feb 3, 2011 at 6:33 PM, Mladen Gogala mladen.gog...@vmsinfo.com wrote:
Kevin Grittner wrote:
Mladen Gogala mladen.gog...@vmsinfo.com wrote:
Maybe we can agree to remove that ridiculous we don't want hints
note from Postgresql wiki?
I'd be
On 2011-02-03 23:29, Robert Haas wrote:
Yeah, but you'll be passing the entire table through this separate
process that may only need to see 1% of it or less on a large table.
It doesn't sound too impossible to pass only a percentage, starting high
and dropping towards 1% once the loaded size
On 2011-02-03 21:51, Mark Kirkwood wrote:
The cases I've seen in production typically involve outgrowing optimizer
parameter settings: (e.g work_mem, effective_cache_size) as the application dataset gets
bigger over time.
An argument in favour of the DBMS maintaining a running estimate of
On PostgreSQL, the difference in no hints and hints for that one query
with skewed data is that the query finishes a little faster. On some
others, which shall remain nameless, it is the difference between
finishing in seconds or days, or maybe never. Hints can be useful, but
I can also
On 04/02/11 13:49, Jeremy Harris wrote:
On 2011-02-03 21:51, Mark Kirkwood wrote:
The cases I've seen in production typically involve outgrowing
optimizer parameter settings: (e.g work_mem, effective_cache_size) as
the application dataset gets bigger over time.
An argument in favour of the
On Thu, Feb 3, 2011 at 7:39 PM, da...@lang.hm wrote:
Yeah, but you'll be passing the entire table through this separate
process that may only need to see 1% of it or less on a large table.
If you want to write the code and prove it's better than what we have
now, or some other approach that
On Thu, Feb 3, 2011 at 7:39 PM, Mladen Gogala mladen.gog...@vmsinfo.com wrote:
reality. As a matter of fact, Oracle RDBMS on the same machine will
regularly beat PgSQL in performance.
That has been my experience so far. I even posted counting query results.
It sure is, but those count
On Thu, 3 Feb 2011, Robert Haas wrote:
On Thu, Feb 3, 2011 at 7:39 PM, da...@lang.hm wrote:
Yeah, but you'll be passing the entire table through this separate
process that may only need to see 1% of it or less on a large table.
If you want to write the code and prove it's better than what we
On Thu, Feb 3, 2011 at 8:37 PM, da...@lang.hm wrote:
On Thu, 3 Feb 2011, Robert Haas wrote:
On Thu, Feb 3, 2011 at 7:39 PM, da...@lang.hm wrote:
Yeah, but you'll be passing the entire table through this separate
process that may only need to see 1% of it or less on a large table.
If you
I can't remember
anyone ever complaining ANALYZE took too long to run. I only
remember complaints of the form I had to remember to manually run it
and I wish it had just happened by itself.
Robert,
This sounds like an argument in favor of an implicit ANALYZE after all
COPY statements,
On Thu, 2011-02-03 at 18:12 -0800, Conor Walsh wrote:
I can't remember
anyone ever complaining ANALYZE took too long to run. I only
remember complaints of the form I had to remember to manually run it
and I wish it had just happened by itself.
Robert,
This sounds like an argument in
On Thu, Feb 3, 2011 at 6:33 PM, Joshua D. Drake j...@commandprompt.com wrote:
Well that already happens...
My understanding is that auto-analyze will fire only after my
transaction is completed, because it is a seperate daemon. If I do
like so:
BEGIN;
COPY ...;
-- Dangerously un-analyzed
On Thu, Feb 3, 2011 at 5:39 PM, Mladen Gogala mladen.gog...@vmsinfo.com wrote:
Actually, it is not unlike a religious dogma, only stating that hints are
bad. It even says so in the wiki. The arguments are
There's been considerably more output than hints bad! Hulk Smash!
1) Refusal to
On Thu, 2011-02-03 at 16:50 -0500, Mladen Gogala wrote:
Chris Browne wrote:
Well, the community declines to add hints until there is actual
consensus on a good way to add hints.
OK. That's another matter entirely. Who should make that decision? Is
there a committee or a person who
On Thu, Feb 3, 2011 at 7:05 PM, Robert Haas robertmh...@gmail.com wrote:
If you want to randomly pick 10,000 rows out of all the rows that are
going to be inserted in the table without knowing in advance how many
there will be, how do you do that?
Maybe you could instead just have it use some
Scott Marlowe wrote:
Yes they're useful, but like a plastic bad covering a broken car window,
they're useful because they cover something that's inherently broken.
Awesome. Now we have a car anology, with a funny typo no less.
Plastic bad, I love it. This is real progress toward getting
On 02/03/2011 09:45 PM, Conor Walsh wrote:
My understanding is that auto-analyze will fire only after my
transaction is completed, because it is a seperate daemon. If I do
like so:
BEGIN;
COPY ...;
-- Dangerously un-analyzed
SELECT complicated-stuff ...;
END;
Auto-analyze does not benefit me,
On Thu, Feb 3, 2011 at 8:40 PM, Greg Smith g...@2ndquadrant.com wrote:
Scott Marlowe wrote:
Yes they're useful, but like a plastic bad covering a broken car window,
they're useful because they cover something that's inherently broken.
Awesome. Now we have a car anology, with a funny typo
Scott Marlowe wrote:
It's not so much a car analogy as a plastic bad analogy.
Is that like a Plastic Ono Band? Because I think one of those is the
only thing holding the part of my bumper I smashed in the snow on right
now. I could be wrong about the name.
--
Greg Smith 2ndQuadrant
On Thu, Feb 3, 2011 at 8:56 PM, Greg Smith g...@2ndquadrant.com wrote:
Scott Marlowe wrote:
It's not so much a car analogy as a plastic bad analogy.
Is that like a Plastic Ono Band? Because I think one of those is the only
thing holding the part of my bumper I smashed in the snow on right
Scott Marlowe wrote:
No, that's a plastic oh no! band you have.
Wow, right you are. So with this type holding together my Japanese car,
if it breaks and parts fall off, I'm supposed to yell Oh, no! There
goes Tokyo!, yes?
--
Greg Smith 2ndQuadrant USg...@2ndquadrant.com
On Thu, Feb 3, 2011 at 6:05 PM, Robert Haas robertmh...@gmail.com wrote:
If you want to randomly pick 10,000 rows out of all the rows that are
going to be inserted in the table without knowing in advance how many
there will be, how do you do that?
Reservoir sampling, as the most well-known
Neat. That was my 'you learn something every day' moment. Thanks.
On Thu, Feb 3, 2011 at 9:06 PM, David Wilson david.t.wil...@gmail.comwrote:
On Thu, Feb 3, 2011 at 6:05 PM, Robert Haas robertmh...@gmail.com wrote:
If you want to randomly pick 10,000 rows out of all the rows that are
2011/2/3 da...@lang.hm
If the table is not large enough to fit in ram, then it will compete for
I/O, and the user will have to wait.
what I'm proposing is that as the records are created, the process doing
the creation makes copies of the records (either all of them, or some of
them if not
2011/2/4 Mladen Gogala mladen.gog...@vmsinfo.com
Josh Berkus wrote:
However, since this system wasn't directly compatible with Oracle Hints,
folks pushing for hints dropped the solution as unsatisfactory. This is
the discussion we have every time: the users who want hints specifically
want
On Fri, 4 Feb 2011, ??? wrote:
2011/2/3 da...@lang.hm
If the table is not large enough to fit in ram, then it will compete for
I/O, and the user will have to wait.
what I'm proposing is that as the records are created, the process doing
the creation makes copies of the records
4 лютого 2011 р. 09:32 da...@lang.hm написав:
when a copy command is issued, I assume that there is some indication of
how much data is going to follow. I know that it's not just 'insert
everything until the TCP connection terminates' because that would give you
no way of knowing if the
On Tue, Feb 1, 2011 at 6:44 PM, Mladen Gogala mladen.gog...@vmsinfo.com wrote:
On 2/1/2011 6:03 PM, Andrew Dunstan wrote:
Whether or not it's bad application design, it's ubiquitous, and we
should make it work as best we can, IMNSHO. This often generates
complaints about Postgres, and if we
Robert Haas wrote:
On Tue, Feb 1, 2011
It would be pretty hard to make autoanalyze work on such tables
without removing some of the performance benefits of having such
tables in the first place - namely, the local buffer manager. But you
could ANALYZE them by hand.
Not necessarily
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