On 07/31/2017 09:25 PM, Daulat Ram wrote:
Hi team,
I need to connect to MS-SQL server 2008/2012 from PostgreSQL 9.5 in
Windows7 environment to fetch the tables of SQL server.
Please help on this.
https://github.com/tds-fdw/tds_fdw
JD
Regards,
Daulat
--
On 07/11/2017 04:15 PM, Merlin Moncure wrote:
On Mon, Jul 10, 2017 at 9:03 AM, Charles Nadeau
wrote:
I’m running PostgreSQL 9.6.3 on Ubuntu 16.10 (kernel 4.4.0-85-generic).
Hardware is:
*2x Intel Xeon E5550
*72GB RAM
*Hardware RAID10 (4 x 146GB SAS 10k) P410i controller with 1GB FBWC (80%
re
On 05/25/2017 07:15 PM, Scott Mead wrote:
Thanks
ravi
We use Zabbix.
JD
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On 04/27/2017 09:34 AM, Andres Freund wrote:
On 2017-04-27 09:31:34 -0700, Joshua D. Drake wrote:
On 04/27/2017 08:59 AM, Andres Freund wrote:
I would agree it isn't yet a widespread issue.
I'm not yet sure about that actually. I suspect a large percentage of
people with such
On 04/27/2017 08:59 AM, Andres Freund wrote:
Ok, based on the, few, answers I've got so far, my experience is indeed
skewed. A number of the PG users I interacted with over the last couple
years had WAL write ranges somewhere in the range of 500MB/s to 2.2GB/s
(max I'veseen). At that point WA
On 01/12/2017 09:08 AM, Eric Jensen wrote:
I'm using postgresql 9.5.4 on amazon RDS with ~1300 persistent
connections from rails 4.2 with "prepared_statements: false". Over the
enter image description here
PostgreSQL on RDS is a closed product. My recommendation would be to
contact Amazon supp
On 12/13/2016 12:16 PM, ProPAAS DBA wrote:
Hi All;
I'm not a VMware expert, however I thought VMware would allow the
creation of multiple disk volumes and attach them via separate mount
points. Is this not true? If it is an option can someone point me to a
how to...
Yes it is possible to do
On 10/28/2016 08:44 AM, Warner, Gary, Jr wrote:
I've recently been blessed to move one of my databases onto a huge IBM P8
computer. Its a power PC architecture with 20 8-way cores (so postgres SHOULD
believe there are 160 cores available) and 1 TB of RAM.
I've always done my postgres tuning
On 06/15/2016 07:20 AM, Ivan Voras wrote:
Hi,
Just for testing... is there a fast (i.e. written in C) crc32 or a
similar small hash function for PostgreSQL?
https://www.postgresql.org/docs/9.5/static/pgcrypto.html
We also have a builtin md5().
JD
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On 12/10/2015 12:58 PM, Tory M Blue wrote:
synchronous is commented out, is it on by default?
Yes it is on by default.
This is a slony slave node, so I'm not too worried about this particular
host losing it's data, thus fsync is off,
thanks again sir
Tory
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On 12/10/2015 10:35 AM, Tory M Blue wrote:
Thiis valid regardless of the workload?
Yes.
Seems that I would be storing a
ton of data and writing it once an hour, so would have potential perf
hits on the hour. I guess I'm not too up to date on the checkpoint
configuration.
No, that isn't
On 12/10/2015 01:12 AM, Tory M Blue wrote:
checkpoint_timeout = 5min
checkpoint_completion_target = 0.9
The above is your problem. Make checkpoint_timeout = 1h . Also,
considering turning synchronous_commit off.
JD
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On 07/08/2015 10:48 AM, Craig James wrote:
I admit that I haven't read this whole thread but:
Using Apache Fast-CGI, you are going to fork a process for each
instance of the function being executed and that in turn will use
all CPUs up to the max available resource.
With P
On 07/07/2015 08:05 PM, Craig James wrote:
No ideas, but I ran into the same thing. I have a set of C/C++ functions
that put some chemistry calculations into Postgres as extensions (things
like, "calculate the molecular weight of this molecule"). As SQL
functions, the whole thing bogged down,
On 07/06/2015 09:56 AM, Steve Crawford wrote:
On 07/02/2015 07:01 AM, Wes Vaske (wvaske) wrote:
For what it's worth, in my most recent iteration I decided to go with
the Intel Enterprise NVMe drives and no RAID. My reasoning was thus:
1. Modern SSDs are so fast that even if you had an infini
On 06/13/2015 10:27 AM, Kaijiang Chen wrote:
Hi, I am using postgresql 9.2.10 on centos 6.2, 64 bit version. The
server has 512 GB mem.
The jobs are mainly OLAP like. So I need larger work_mem and shared
buffers. From the source code, there is a constant MaxAllocSize==1GB.
So, I wonder whether
On 06/12/2015 01:37 PM, Michael Nolan wrote:
Last night I was doing some tuning on a database The longest query I
was running was taking around 160 seconds. I didn't see much change in
the running time for that query, even after restarting PG.
Today, with roughly the same system load (possibl
On 06/03/2015 03:16 PM, Tomas Vondra wrote:
What is more important, though, is the amount of memory. OP reported the
query writes ~95GB of temp files (and dies because of full disk, so
there may be more). The on-disk format is usually more compact than the
in-memory representation - for example
On 04/29/2015 01:08 AM, Andres Freund wrote:
Which OS and filesystem is this done on? Because many halfway modern
systems, like e.g ext4 and xfs, implement this in the background as
'delayed allocation'.
Oh, it's in the subject. Stupid me, sorry for that. I'd consider testing
how much better
chitecture of a rather complex solution and a migration.
Sincerely,
Joshua D. Drake
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Now I get it: your serv
On 03/15/2015 09:43 AM, Scott Marlowe wrote:
* Consider installing perf (linux-utils-$something) and doing a
systemwide profile.
3.2 isn't the greatest kernel around, efficiency wise. At some point you
might want to upgrade to something newer. I've seen remarkable
differences around this.
On 03/15/2015 05:08 AM, Robert Kaye wrote:
On Mar 15, 2015, at 12:41 PM, Andreas Kretschmer
wrote:
just a wild guess: raid-controller BBU faulty
We don’t have a BBU in this server, but at least we have redundant power
supplies.
In any case, how would a fault batter possibly cause this?
On 08/21/2014 04:29 PM, Josh Berkus wrote:
On 08/21/2014 04:08 PM, Steve Crawford wrote:
On 08/21/2014 03:51 PM, Josh Berkus wrote:
On 08/21/2014 02:26 PM, Scott Marlowe wrote:
I'm running almost the exact same setup in production as a spare. It
has 4 of those CPUs, 256G RAM, and is currentl
On 03/25/2014 08:21 AM, Magnus Hagander wrote:
I would say that's the one thing that rsync is *not*. pg_basebackup
takes care of a lot of things under the hood. rsync is a lot more
complicated, in particular in failure scenarios, since you have to
manually deal with pg_start/stop_backup().
Ther
On 03/25/2014 08:18 AM, Ilya Kosmodemiansky wrote:
Joshua,
that is really good point: an alternative is to use pg_basebackup
through ssh tunnel with compression, but rsync is much simpler.
Or rsync over ssh. The advantage is that you can create backups that
don't have to be restored, just s
On 03/25/2014 05:05 AM, Claudio Freire wrote:
On Tue, Mar 25, 2014 at 4:39 AM, David Johnston wrote:
Hai,
Can anyone tell me the difference and performance between pgdump and
pg_basebackup if I want to backup a large database.
Honestly,
Neither is particularly good at backing up large da
One of the many questions we have is about performance of the db if we
work with only one (using a ClientID to separete de clients info) or thousands
of separate dbs. The management of the dbs is not a huge concert as we
have an automated tool.
If you are planning on using persisted connectio
On 08/29/2013 09:42 AM, bsreejithin wrote:
The performance test that was conducted was for 1 Hour.
There are 6 transactions. 2 DB inserts and 4 SELECTs.
Every 2 minutes there will be 4 SELECTs. And every 3 minutes there will be 2
DB inserts.
This shouldn't be a problem with proper hardware a
On 08/29/2013 07:59 AM, Richard Huxton wrote:
On 29/08/13 13:14, bsreejithin wrote:
I am *expecting 1000+ hits to my PostgreSQL DB* and I doubt my
standalone DB
will be able to handle it.
We are going to need a little more detail here. In a normal environment
1000+ "hits" isn't that much,
On 07/09/2013 03:14 PM, Josh Berkus wrote:
On 07/08/2013 09:14 AM, Jeison Bedoya wrote:
Hi, i have a postgresql 9.2.2, but i don´t use autovaccum but i want to
begin to use it. some recommendation about the optimal configuration?
or some link to explain it.
Initial configuration:
autovacuu
On 05/22/2013 07:17 PM, Merlin Moncure wrote:
> According the the data sheet it is power safe.
>
> http://investors.micron.com/releasedetail.cfm?ReleaseID=732650
> http://www.micron.com/products/solid-state-storage/client-ssd/m500-ssd
Wow, that seems like a pretty good deal then assuming i
On 05/22/2013 04:37 PM, Merlin Moncure wrote:
On Wed, May 22, 2013 at 5:42 PM, Joshua D. Drake wrote:
I am curious how the 710 or S3700 stacks up against the new M500 from
Crucial? I know Intel is kind of the goto for these things but the m500 is
power off protected and rated at: Endurance
n the poke but it sure seems like a very
reasonable drive for the price:
http://www.newegg.com/Product/Product.aspx?Item=20-148-695&ParentOnly=1&IsVirtualParent=1
Sincerely,
Joshua D. Drake
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On 05/22/2013 11:06 AM, Greg Smith wrote:
I have some moderately fast SSD based transactional systems that are
still using traditional drives with battery-backed cache for the
sequential writes of the WAL volume, where the data volume is on Intel
710 disks. WAL writes really burn through flash
On 03/13/2013 11:45 AM, Vasilis Ventirozos wrote:
Its better to split WAL segments and data just because these two have
different io requirements and because its easier to measure and tune
things if you have them on different disks.
Generally speaking you are correct but we are talking about R
On 03/05/2013 03:51 PM, Niels Kristian Schjødt wrote:
3ms isn't slow
Sorry, it's 3323ms!
Can I do anything to optimize that query or maybe the index or something?
your index is already used
Okay this leaves me with - "get better hardware" or?
What does explain analyze say versus just
at is your default_statistics_target?
Joshua D. Drake
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On 04/26/2012 12:49 PM, Craig James wrote:
An update to our system means I'm going to be rewriting every row of
some large tables (20 million rows by 15 columns). In a situation
like this, can auto-vacuum take care of it, or should I plan on
vacuum-full/reindex to clean up?
If you rewrite t
On 04/13/2011 05:03 PM, Tom Lane wrote:
That 4:1 ratio is based on some rather extensive experimentation that
I did back in 2000. In the interim, disk transfer rates have improved
quite a lot more than disk seek times have, and the CPU cost to process
a page's worth of data has also improved com
On Mon, 11 Apr 2011 13:09:15 -0500, "Kevin Grittner"
wrote:
> Glyn Astill wrote:
>
>> The new server uses 4 x 8 core Xeon X7550 CPUs at 2Ghz
>
> Which has hyperthreading.
>
>> our current servers are 2 x 4 core Xeon E5320 CPUs at 2Ghz.
>
> Which doesn't have hyperthreading.
>
> PostgreS
On Thu, 2011-03-03 at 13:16 +0800, Selva manickaraja wrote:
> Thanks for the enlightenment. I will then look into other tools that
> help
> with performance testing. Is pgbench really useful? We need to produce
> the
> reports and statistics to our management as we are planning to migrate
> one
> s
can't solve that problem you really should
contract with someone to help you with your performance tests because
you are not going to be able to adequately tune PostgreSQL for a proper
test.
That said, the reason you can't find make is that you don't have the
proper de
On Mon, 2011-02-07 at 14:58 -0800, Josh Berkus wrote:
> >> Anyone seen anything like this before?
> >>
> >
> > it is the expected behavior, IIRC
>
> OK. It just seems kind of pathological for stats file writing to be 10X
> the volume of data writing. I see why it's happening, but I think it's
>
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
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.
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On Sun, 2010-11-28 at 12:46 +0100, Mario Splivalo wrote:
> The database for monitoring certain drone statuses is quite simple:
>
> This is the slow part:
> INSERT INTO drones_history (sample_id, drone_id, drone_log_notice,
> drone_temperature, drone_pressure)
> SELECT * FROM tmpUpdate;
>
> For
On Thu, 2010-10-28 at 12:59 -0700, Ben wrote:
> On Oct 28, 2010, at 12:44 PM, Joshua D. Drake wrote:
> >
> > My tests show you are incorrect:
> >
> >
> > part_test=# explain analyze select * from foo join bar using (i) where
> > i=9;
> >
On Thu, 2010-10-28 at 12:25 -0700, Ben wrote:
> i think we are talking about two different things here: the constraints on
> the table, and the where-clause constraints in a query which may or may not
> trigger constraint exclusion. i understand that table constraints have to be
> constants --
(as
an example)
>
> >> is my intuition completely off on this?
> >
> > You may actually want to look into expression indexes, not clustered
> > ones.
Take a look at the docs:
http://www.postgresql.org/docs/8.4/interactive/indexes-expressional.html
It "could&quo
. Not sure about the operator
question honestly.
> is my intuition completely off on this?
You may actually want to look into expression indexes, not clustered
ones.
Sincerely,
Joshua D. Drake
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ta for that right now.
This is interesting, are you using libpq or libpqXX?
Joshua D. Drake
>
>
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point of time.
Did you test?
>
> 2. What are the average storage requirements of postgres compared to
> Oracle? I
> inserted upto 1 million records. The storage requirement of postgreSQL
> is almost
> double than that of Oracle.
What was your table structure?
Jos
On Wed, 2010-10-20 at 22:13 -0400, Bruce Momjian wrote:
> Ben Chobot wrote:
> > On Oct 7, 2010, at 4:38 PM, Steve Crawford wrote:
> >
> > > I'm weighing options for a new server. In addition to PostgreSQL, this
> > > machine will handle some modest Samba and Rsync load.
> > >
> > > I will have en
On Mon, 2010-10-11 at 10:50 -0700, Josh Berkus wrote:
> > There's a number of blog tests floating around comparing XFS and Ext3,
> > and the various Linux schedulers, for PGDATA or for an all-in-one mount.
> >
> > However, the WAL has a rather particular write pattern, and it's
> > reasonable to a
On Mon, 2010-10-04 at 11:34 -0700, Josh Berkus wrote:
> > And your point is? The design center for the current setup is maybe 5
> > or 10 partitions. We didn't intend it to be used for more partitions
> > than you might have spindles to spread the data across.
>
> Where did that come from?
Yea
m_page_cost back to 4 and try
increasing cpu_tuple_cost instead.
Sincerely,
Joshua D. Drake
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in-house apps/scripts/..etc started to
> experience show stopping problems.
Use pgbouncer. It is what Skype uses.
Sincerely,
Joshua D. Drake
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On Mon, 2010-09-13 at 16:47 -0700, Josh Berkus wrote:
> On 9/13/10 4:41 PM, Joshua D. Drake wrote:
> > On Mon, 2010-09-13 at 16:06 -0700, Josh Berkus wrote:
> >> All,
> >>
> >> I've been looking at pg_stat_user_tables (in 8.3, because of a project I
> &
ms and it was a bottleneck.
(IIRC)
Joshua D. Drake
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he toy. I can get 4 SATA-II with RAID Controller, with
battery backed cache, for the same price or less :P
Sincerely,
Joshua D. Drake
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this case...
It is variable based on workload and as I recall has to do with the
planning time. As the number of children increases, so does the planning
time.
Joshua D. Drake
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aster control.
Yeah but that won't happen. Also I think we may have a libevent
dependency that we have to work out.
>
> You probably can't get much leaner than pgbouncer.
Oh don't get me wrong. I love pgbouncer. It is my recommended pooler but
even it has limitations (such as
On Thu, 2010-07-22 at 14:36 -0400, Robert Haas wrote:
> On Mon, Jul 12, 2010 at 6:58 AM, Craig Ringer
> wrote:
> > So rather than asking "should core have a connection pool" perhaps
> > what's needed is to ask "what can an in-core pool do that an external
> > pool cannot do?"
>
> Avoid sending e
3. You didn't run ANALYZE on one of the machines
Sincerely,
Joshua D. Drake
>
> Thanks!
> Patrick
>
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>>> I cant figure out why we're scanning all of our partitions.
>
> I don't think extract() is immutable, which would pretty much invalidate
> your check constraints as far as CE is concerned.
Correct.
Joshua D. Drake
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Command
IOS. It will tell you.
Sincerely,
Joshua D. Drake
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attached output from "top
> -b", which shows what is happening during one of the CPU spikes.
checkpoint causing IO Wait.
What does sar say about these times?
Joshua D. Drake
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On Thu, 2010-06-24 at 21:14 +0200, Pavel Stehule wrote:
> 2010/6/24 Josh Berkus :
> >
> >> And I'm also planning to implement unlogged tables, which have the
> >> same contents for all sessions but are not WAL-logged (and are
> >> truncated on startup).
>
> this is similar MySQL's memory tables. P
On Tue, 2010-06-22 at 18:00 -0700, Anj Adu wrote:
> i have several partitions like this (similar size ...similar data
> distribution)..these partitions are only "inserted"..never updated.
> Why would I need to vacuum..
>
An explain analyze is what is in order for further diagnosis.
JD
> I can
>
> incidentally, both tests were starting from a blank database.
>
> Is this expected?
Without a more complete picture of the configuration, this post doesn't
mean a whole lot. Further, effective_cash_size is not likely to effect a
bulk load at all.
Joshua D. Drake
>
&g
On Wed, 2010-04-07 at 14:45 -0700, Craig James wrote:
> On 4/7/10 2:40 PM, Joshua D. Drake wrote:
> > On Wed, 2010-04-07 at 14:37 -0700, Craig James wrote:
> >> Most of the time Postgres runs nicely, but two or three times a day we get
> >> a huge spike in the CPU l
processes, but I think it missed the bulk of the spike.
What does iostat 5 say during the jump?
Joshua D. Drake
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Respect i
enode.1,filenode.2,...filenode.43) created in the database subdirectory
> within PGDATA/base.
>
> This caused the disk space quickly used up. Is this expected?
Yes. Especially if autovacuum is not keeping up with the number of
updates.
Joshua D. Drake
>
> Thanks for any in
dds_only/
>
> As one of the comments points out, that kind of makes them no longer SATA
> or SAS compatible, and they shouldn't be allowed to use those acronyms any
> more.
That's interesting. I know that IBM at least on some of their models
have done the same. Glad I u
3 series which I believe is
8.3.9.
With the imminent release of 8.5 (6 months), it may be time to move to
8.4.2 instead.
Joshua D. Drake
>
> Thanks,
>
> Carlo
>
> The details of our use:
>
> . The DB hosts is a data warehouse and a knowledgebase (KB) tracking th
, whether intentionally or not.
Joshua D. Drake
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If the world pushes look it in the eye and GRR. Then push back harder. -
Salamander
't work then try a mini xfs.
Do not turn fsync off. That is bad advice. I would not suggest ext4 at
this point for database operations. Use ext3. It is backward compatible.
Joshua D. Drake
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t, then start a transaction that drops the old table and
> renames the new one.
>
> Any thoughts?
Use partitioning so you can roll off data.
http://www.postgresql.org/docs/8.3/interactive/ddl-partitioning.html
Joshua D. Drake
>
> Thanks,
> Craig
>
>
--
Postgr
S.
If you overran your max_fsm_pages you are going to have indexes that are
not properly cleaned up, even after a vacuum full. You will need to
cluster or reindex.
Joshua D. Drake
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On Thu, 2009-10-08 at 10:44 -0700, Justin T Pryzby wrote:
> Hi Everyone
Did your scheduler change between the kernel versions?
> Not sure if sar can provide other data included by vmstat: IO merged
> in/out, {,soft}irq ticks?
>
> Thanks,
> Justin
>
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Command
ains constants. A parameterized query will not be optimized,
since the planner cannot know which partitions the parameter
value might select at run time. For the same reason, "stable"
functions such as CURRENT_DATE must be avoided.
http://www.postgresql.org/docs/8.3/st
On Thu, 2009-08-06 at 12:38 -0400, Ray Stell wrote:
> On Thu, Aug 06, 2009 at 09:12:22AM -0700, Joshua D. Drake wrote:
> > Why aren't you using systemtap again?
>
> 1. significant solaris responsibilites
There is your problem right there ;)
> 2. significant linux res
ng systemtap again? As I recall it uses the same
interface as dtrace. The front end is just different.
Joshua D. Drake
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? :)
>
> Buchardo? :)
A new desert, Buchardo CMO:
Two shots of brandy
One shot of rum
Vanilla Ice cream
Cherries
Blend to perfection.
Joshua D. Drake
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>
> Then there are Slony-I, Buchardo, Mamoth Replicator from CMO, simple
> replication in Postgres 8.4 and other projects...
CMO? :)
Joshua D. Drake
>
> Suggestions?
> Thanks,
>
> -- Shaul
>
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On Tue, 2009-05-26 at 19:52 -0600, Scott Marlowe wrote:
> On Tue, May 26, 2009 at 7:41 PM, Scott Carey wrote:
> >
> > On 5/26/09 6:17 PM, "Greg Smith" wrote:
> >
> >> On Tue, 26 May 2009, Joshua D. Drake wrote:
> >>
> >>> CMD doe
t folk. CMD doesn't rent
hardware you would have to provide that, Rack Space does.
Joshua D. Drake
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ume to WAL), and more total performance on paper. I
> would also, if you can afford it and they fit, get two small sata
> drives, mount raid 1 and put the o/s on those.
+1 on that.
Joshua D. Drake
>
> merlin
>
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On Tue, 2009-05-12 at 20:34 -0400, Aidan Van Dyk wrote:
> * Joshua D. Drake [090512 19:27]:
>
> > Apache solved this problem back when it was still called NSCA HTTPD. Why
> > aren't we preforking again?
>
> Of course, preforking and connection pooling are totally
as problems too under
heavy load (due to libevent issues). It also doesn't support all of our
auth methods.
Apache solved this problem back when it was still called NSCA HTTPD. Why
aren't we preforking again?
Joshua D. Drake
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onnect and reconnect yes. If they keep the connections live
then no.
Joshua D. Drake
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On Fri, 2009-05-08 at 18:06 +0200, Paolo Rizzi wrote:
> Hi all,
> recently I came across a question from a customer of mine, asking me if
> it would feasible to run PostgreSQL along with PostGIS on embedded hardware.
> They didn't give me complete information, but it should be some kind of
> indu
en if you do a single BEGIN;
with 1000 inserts you are still getting a round trip for every insert
until you commit. Based on 20ms round trip time, you are talking
20seconds additional overhead.
Joshua D. Drake
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e instances. The
interesting thing here is the -s 1000m and -r8k. Those options are
basically use a 1000 meg file (like our data files) with 8k chunks (like
our pages).
Based on your partitioning scheme, what is the break out? Can you
reasonably expect all partitions to be used eq
ce to
> restore.
Archive logs are restored in a serialized manner so they will be slower
to restore in general.
Joshua D. Drake
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The PostgreSQL Comp
checkpoint segment, dirty data is written to disk?
A checkpoint occurs.
Joshua D. Drake
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PostgreSQL - XMPP: jdr...@jabber.postgresql.org
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The PostgreSQL Company, serving since 1997
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On Thu, 2009-02-05 at 12:40 +, Matt Burke wrote:
> Arjen van der Meijden wrote:
>
> Are there any reasonable choices for bigger (3+ shelf) direct-connected
> RAID10 arrays, or are hideously expensive SANs the only option? I've
> checked out the latest Areca controllers, but the manual availab
and break that appart. Reading the TOC is
pretty self evident. Once you get down to index creation you can create
multiple files each with a group of indexes to create. Then call
pg_restore multiple times in a script against the individual TOC and you
will use all cores.
Joshua D. Drake
P.S.
5 hours (versus 15). IMO, that is
a *little* more than somewhat. Maybe, a bit? ;)
Joshua D. Drake
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PostgreSQL - XMPP: jdr...@jabber.postgresql.org
Consulting, Development, Support, Training
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The PostgreSQL Company, serving since 1997
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There is no correct in right.
Correctness is the result of friction caused by the mingling of the two.
Sincerely,
Joshua D. Drake
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