On Tue, Nov 20, 2012 at 4:08 PM, Jeff Janes wrote:
>> It strikes me as cavalier to be resetting
>> trycounter while sitting under the #1 known contention point for read
>> only workloads.
>
> The only use for the trycounter is to know when to ERROR out with "no
> unpinned buffers available", so no
On Wed, Nov 21, 2012 at 11:05 AM, Vlad wrote:
> it's session mode and the pool size is 1200 (cause I need to grantee that in
> the worst case we have enough slots for all possible clients), however even
> at the times preceding high-cpu-sys-stall, the number postmasters are like
> 15-20. When sta
On Wed, Nov 21, 2012 at 10:43 AM, Jeff Janes wrote:
> On Wed, Nov 21, 2012 at 7:29 AM, Vlad Marchenko wrote:
>
>> update on my problem: despite pgbouncer, the problem still occures on my
>> end.
>
> As Merlin asked, how big is the pool? Maybe you are using a large
> enough pool so as to defeat t
On Tue, Nov 20, 2012 at 12:16 PM, Jeff Janes wrote:
> On Tue, Nov 20, 2012 at 9:05 AM, Merlin Moncure wrote:
>> On Tue, Nov 20, 2012 at 10:50 AM, Jeff Janes wrote:
>>>
>>> I wouldn't expect so. Increasing shared_buffers should either fix
>>> free li
On Wed, Nov 21, 2012 at 11:56 AM, Vlad wrote:
> ok, understood.
> I need to give some more thoughts to if it's possible for us to switch to
> transaction mode from app standpoint of view.
>
> if yes, then setting pool size to 20 (for 8 cores) sounds OK?
If it was me, I would be starting with exa
On Wed, Nov 21, 2012 at 12:17 PM, Vlad wrote:
> It turned out we can't use transaction mode, cause there are prepared
> statement used a lot within code, while processing a single http request.
prepare statements can be fudged within some constraints. if prepared
statements are explicitly named
On Wed, Nov 21, 2012 at 9:29 AM, Vlad Marchenko wrote:
> update on my problem: despite pgbouncer, the problem still occures on my
> end.
>
> Also, interesting observation - I ran several tests with pgbench, using
> queries that I think are prone to trigger high-sys-cpu-stall. What I noticed
> is w
On Tue, Nov 20, 2012 at 1:25 PM, Dmitry Koterov wrote:
> Hello.
>
> Sometimes I see a strange slowdown on my PG 9.1 server: it looks like the
> simplest queries which typically take 1ms or less (e.g. selection of a row
> by its primary key) take 300ms or even more. It is related to all queries
> w
On Tue, Nov 20, 2012 at 10:50 AM, Jeff Janes wrote:
> On Tue, Nov 20, 2012 at 8:03 AM, Merlin Moncure wrote:
>> On Tue, Nov 20, 2012 at 9:02 AM, Shaun Thomas
>> wrote:
>>> On 11/16/2012 02:31 PM, Merlin Moncure wrote:
>>>
>>>> no single thing re
On Thu, Nov 15, 2012 at 4:29 PM, Alvaro Herrera
wrote:
> Merlin Moncure escribió:
>
>> ok, excellent. reviewing the log, this immediately caught my eye:
>>
>> recvfrom(8, "\27\3\1\0@", 5, 0, NULL, NULL) = 5
>> recvfrom(8,
>> "\327\327\nl\23
On Tue, Nov 20, 2012 at 10:12 AM, Shaun Thomas wrote:
> On 11/20/2012 10:03 AM, Merlin Moncure wrote:
>
>> Shared buffer manipulation changing contention is suggesting you're
>> running into free list lock issues. How many active backends/cores?
>
>
> Oh, the rea
On Tue, Nov 20, 2012 at 9:02 AM, Shaun Thomas wrote:
> On 11/16/2012 02:31 PM, Merlin Moncure wrote:
>
>> no single thing really stands out -- contention is all over the place.
>> lwlock, pinbuffer, dynahash (especially). I am again suspicious of
>> bad scheduler interac
On Fri, Nov 16, 2012 at 2:13 PM, Vlad wrote:
> ok, I've applied that patch and ran. The stall started around 13:50:45...50
> and lasted until the end
>
> https://dl.dropbox.com/u/109778/postgresql-2012-11-16_134904-stripped.log
>
> the actual log has more data (including statement following each '
On Mon, Nov 19, 2012 at 12:02 PM, Vlad wrote:
>
> Some additional observation and food for thoughts. Our app uses connection
> caching (Apache::DBI). By disabling Apache::DBI and forcing client
> re-connection for every (http) request processed I eliminated the stall. The
> user cpu usage jumped (
On Fri, Nov 16, 2012 at 3:21 PM, Vlad wrote:
> what would pgbouncer do in my case? Number of connections will decrease, but
> number of active clients won't be smaller. As I understand the latter ones
> are that important.
Well, one thing that struck me was how little spinlock contention
there ac
On Mon, Nov 19, 2012 at 10:50 AM, Vlad wrote:
> I just did a little experiment: extracted top four queries that were
> executed the longest during stall times and launched pgbench test with 240
> clients. Yet I wasn't able to put the server into a stall with that. Also
> load average was hitting
On Sun, Nov 18, 2012 at 4:24 PM, Jeff Janes wrote:
> On Fri, Nov 16, 2012 at 12:13 PM, Vlad wrote:
>> ok, I've applied that patch and ran. The stall started around 13:50:45...50
>> and lasted until the end
>>
>> https://dl.dropbox.com/u/109778/postgresql-2012-11-16_134904-stripped.log
>
> That is
On Fri, Nov 16, 2012 at 12:26 PM, Jeff Janes wrote:
> On Fri, Nov 16, 2012 at 8:21 AM, Merlin Moncure wrote:
>> On Fri, Nov 16, 2012 at 9:52 AM, Vlad wrote:
>>>
>>>> *) failing that, LWLOCK_STATS macro can be compiled in to give us some
>>>> info
On Fri, Nov 16, 2012 at 11:19 AM, Vlad wrote:
>
>> We're looking for spikes in 'blk' which represents when lwlocks bump.
>> If you're not seeing any then this is suggesting a buffer pin related
>> issue -- this is also supported by the fact that raising shared
>> buffers didn't help. If you're n
On Wed, Mar 7, 2012 at 11:59 AM, Andrey Chursin wrote:
> Is there any way to sort by ranking, avoiding seq scan?
> The only way i see now is to use pg_trgm instead of ts_rank, but we
> did not check yet how applicable is it for our purposes.
pg_tgrm works very well in terms of measuring similarit
On Fri, Nov 16, 2012 at 9:52 AM, Vlad wrote:
> Merlin,
>
>
>> Yeah -- you're right, this is definitely spinlock issue. Next steps:
>>
>> *) in mostly read workloads, we have a couple of known frequent
>> offenders. In particular the 'BufFreelistLock'. One way we can
>> influence that guy is to
On Thu, Nov 15, 2012 at 6:07 PM, Jeff Janes wrote:
> On Thu, Nov 15, 2012 at 2:44 PM, Merlin Moncure wrote:
>
>>>> select(0, NULL, NULL, NULL, {0, 1000}) = 0 (Timeout)
>>>> select(0, NULL, NULL, NULL, {0, 1000}) = 0 (Timeout)
>>>> select(0,
On Thu, Nov 15, 2012 at 4:29 PM, Alvaro Herrera
wrote:
> Merlin Moncure escribió:
>
>> ok, excellent. reviewing the log, this immediately caught my eye:
>>
>> recvfrom(8, "\27\3\1\0@", 5, 0, NULL, NULL) = 5
>> recvfrom(8,
>> "\327\327\nl\23
On Thu, Nov 15, 2012 at 3:49 PM, Merlin Moncure wrote:
> On Thu, Nov 15, 2012 at 2:44 PM, Vlad wrote:
>>
>>>
>>> yeah. ok, nest steps:
>>> *) can you confirm that postgres process is using high cpu (according
>>> to top) during stall time
>>
&
On Thu, Nov 15, 2012 at 2:44 PM, Vlad wrote:
>
>>
>> yeah. ok, nest steps:
>> *) can you confirm that postgres process is using high cpu (according
>> to top) during stall time
>
>
> yes, CPU is spread across a lot of postmasters
>
> PID USER PR NI VIRT RES SHR S %CPU %MEMTIME+ CO
On Thu, Nov 15, 2012 at 2:20 PM, Vlad wrote:
> Merlin,
>
> this is not my report, probably from a thread that I've referenced as having
> a common symptoms. Here is info about my db:
>
>
> Postgresql 9.1.6.
> Postgres usually has 400-500 connected clients, most of them are idle.
> Database is over
On Thu, Nov 15, 2012 at 11:50 AM, Vlad wrote:
> there is no big spike of queries that cause that, queries come in relatively
> stable pace. It's just when the higher rate of queries coming, the more
> likely this to happen. yes, when stall happens , the active queries pile up
> - but that's the r
On Wed, Nov 14, 2012 at 4:08 PM, John R Pierce wrote:
> On 11/14/12 1:34 PM, Vlad wrote:
>>
>> thanks for your feedback. While implementing connection pooling would make
>> resources utilization more efficient, I don't think it's the root of my
>> problem. Most of the connected clients are at IDLE
On Fri, Nov 9, 2012 at 2:50 PM, Eliot Gable
wrote:
>>> one thing that can cause this unfortunately is advisory locks eating
>>> up exactly the amount of shared memory you have. that's another thing
>>> to rule out.
>>
>> How would I rule this out?
>
> It really was filling the locks table.
>
> Us
On Fri, Nov 9, 2012 at 8:43 AM, Eliot Gable
wrote:
> I have a PGSQL 9.0.1 database which is on the back-end of an app I was
> stress testing last night. This morning, when I try to run psql, I get:
>
> psql: FATAL: out of shared memory
> HINT: You might need to increase max_locks_per_transaction
On Mon, Nov 5, 2012 at 2:46 PM, Moshe Jacobson wrote:
> Is there any practical difference between defining a column as a varchar(n)
> vs. a varchar vs. a text field?
not much. varchar(n) only forces the length to be <= n. I dislike
inventing an 'n' when one is not known, but a lot of people do
On Mon, Oct 22, 2012 at 7:52 AM, Albe Laurenz wrote:
> Hannes Erven wrote:
>> today I ran into an issue I believed to be a FAQ, but fortunately it
>> doesn't seem so as I could find any resources related to this... :-/
>>
>> A misguided click in PGADMIN executed a "TRUNCATE CASCADE" on a rather
>>
On Wed, Oct 17, 2012 at 5:48 AM, John Beynon wrote:
> I have a pretty basic query;
>
> select distinct on (name) name, length(name) from
> drugs
> where customer_id IS NOT NULL
> order by name;
>
> which I'd expect to only return me a single drug name if there are
> duplicates, yet I get
>
> name
On Fri, Oct 12, 2012 at 10:00 AM, Lonni J Friedman wrote:
> On Fri, Oct 12, 2012 at 7:44 AM, Chitra Creta wrote:
>> Hi,
>>
>> I currently have a table that is growing very quickly - i.e 7 million
>> records in 5 days. This table acts as a placeholder for statistics, and
>> hence the records are m
On Mon, Oct 15, 2012 at 8:44 AM, P. Broennimann
wrote:
> Thx for the feedback I will take a look.
>
> Here some details. Basically what I'd like to achieve:
>
> Internet <-> AppliA <-> PostgreSQL <-> AppliB
>
> 1) AppliA receives a request from the internet and calls a Pg/SQL function.
> 2) The
On Sat, Oct 13, 2012 at 3:22 AM, Jasen Betts wrote:
> On 2012-10-11, Vineet Deodhar wrote:
>
>> To give an example, I have tables for storing master records (year master,
>> security master, etc.) for which pkid TINYINT is just sufficient.
>> These pkid's are used as fk constraints in tables for
On Thu, Oct 11, 2012 at 4:44 AM, Vineet Deodhar
wrote:
> Thanks all for your replies.
> This is my first experience with postgres mailing list.
> Hats Off to the active community of pgsql.
> This has definitely raised my confidence level with postgres.
thanks. we like emails that start off 'movi
On Wed, Oct 10, 2012 at 8:27 AM, Seref Arikan
wrote:
> Hi Merlin,
> Thanks for the response. At the moment, the main function is creating two
> temp tables that drops on commit, and python functions fills these. Not too
> bad, but I'd like to push these temp tables to ram, which is a bit tricky
>
On Wed, Oct 10, 2012 at 3:47 AM, Vineet Deodhar
wrote:
> Hi !
> At present, I am using MySQL as backend for my work.
> Because of the licensing implications, I am considering to shift from MySQL
> to pgsql.
> Typically, my apps are multi-user, web based or LAN based.
>
> 1) Read over the internet
On Mon, Oct 8, 2012 at 4:59 PM, Seref Arikan
wrote:
> Thanks Merlin,
> I've tried arrays but plpython does not support returning arrays of custom
> db types (which is what I'd need to do)
hm -- yeah. can your custom types be broken down into plain SQL types
(that is, composite types?). maybe
On Mon, Oct 8, 2012 at 3:14 PM, Seref Arikan
wrote:
> Greetings,
> I have a binary blog which is passed to a plpython function by a plpgsql
> function. plpython is used to create 2 different transformations of this
> binary blob to sets of postgresql type instances.
> The flow is: blob -> plpytho
On Fri, Oct 5, 2012 at 3:09 AM, Ivan Voras wrote:
> I think I can make a fairly educated guess that catching exceptions
> while dealing with session variables should be much, much faster than
> creating any kind of a table :)
That is true, but it's not clear how using session variables keeps you
On Wed, Oct 3, 2012 at 8:15 AM, Léon Melis wrote:
> For some of my customers I wrote a PL/PGSQL function that stores the
> difference between an OLD en NEW record when updating a record. This system
> can be applied as a trigger on the table the customer likes to audit.
> Because the function can
On Wed, Oct 3, 2012 at 9:33 AM, Robert Sosinski
wrote:
> We are running Postgres 9.1.3, and after stopping it by physically shutting
> off the machine, we rebooted and now get this error whenever we try to start
> it.
>
> 2012-10-02 13:54:30 PDT LOG: database system was interrupted; last known up
On Thu, Sep 27, 2012 at 7:49 PM, Maxim Boguk wrote:
> Hi,
>
> One of my project extensively uses ip4r addon (
> http://pgfoundry.org/projects/ip4r/ ).
>
> However, after migration of test environment to 9.2 that addon doesn't
> install anymore without manual fixes.
> Trouble very simple:
> addon u
On Mon, Oct 1, 2012 at 3:58 PM, Moshe Jacobson wrote:
> On Mon, Oct 1, 2012 at 12:22 PM, Merlin Moncure wrote:
>>
>> >> *) Functions without exception blocks are faster than those with.
>> >> *) Therefore, CREATE/IF NOT EXISTS is probably faster (test to be sure)
On Mon, Oct 1, 2012 at 11:22 AM, Merlin Moncure wrote:
>> We currently do use permanent tables using pg_backend_pid(). It's because of
>> the connection pooling specifically that we are having problems with stale
>> data. I have been unable to find a way to automatical
On Mon, Oct 1, 2012 at 10:21 AM, Moshe Jacobson wrote:
> Merlin,
>
> On Mon, Oct 1, 2012 at 10:28 AM, Merlin Moncure wrote:
>>
>>
>> Couple points:
>> *) Functions without exception blocks are faster than those with.
>
>
> Clearly.
>
>>
>&
On Mon, Oct 1, 2012 at 8:36 AM, Moshe Jacobson wrote:
> I am working on an audit logging trigger that gets called for every row
> inserted, updated or deleted on any table.
> For this, I need to store a couple of temporary session variables such as
> the ID of the user performing the change, which
On Mon, Sep 24, 2012 at 5:47 AM, salah jubeh wrote:
> Hello Guys,
>
> Thanks for reply, and sorry for late response. Here is more details.
>
> 1. Both servers are installed on parallel on the same machine, so there is
> no difference in Hardware.
> 2. Both servers have the same configuration sett
On Fri, Sep 21, 2012 at 2:23 PM, Merlin Moncure wrote:
> On Fri, Sep 21, 2012 at 12:39 PM, Benedikt Grundmann
> wrote:
>> On 21 September 2012 14:04, Merlin Moncure wrote:
>>>
>>> On Fri, Sep 21, 2012 at 4:18 AM, Benedikt Grundmann
>>> wrote:
>&g
On Fri, Sep 21, 2012 at 12:39 PM, Benedikt Grundmann
wrote:
> On 21 September 2012 14:04, Merlin Moncure wrote:
>>
>> On Fri, Sep 21, 2012 at 4:18 AM, Benedikt Grundmann
>> wrote:
>> >
>> > On 21 September 2012 07:50, Alban Hertroys wrote:
>>
On Fri, Sep 21, 2012 at 4:18 AM, Benedikt Grundmann
wrote:
>
> On 21 September 2012 07:50, Alban Hertroys wrote:
>>
>> On 20 Sep 2012, at 20:36, Benedikt Grundmann wrote:
>>
>> > So named anonymous records / row types seem to be strangely second
>> > class. Can somebody clarify the restrictions
On Wed, Sep 19, 2012 at 4:37 PM, Lucas Clemente Vella wrote:
> I am trying to write a generic "upsert" function in PL/pgSQL, in a way
> that I can specify the table were I want to insert/update, the columns
> whose values I want to specify, and the values to be inserted.
>
> So far I have come up
On Tue, Sep 18, 2012 at 7:47 PM, David Johnston wrote:
> On Sep 18, 2012, at 20:21, Jean-Christophe Boggio
> wrote:
>
>> I'm looking for an article that explains the difference between these
>> constructs IN POSTGRESQL (the rules seem to differ from one DB to another) :
>>
>> SELECT A.*
>> FROM
On Mon, Sep 17, 2012 at 1:58 PM, niXman wrote:
> Hello,
>
> Tell me please, whether there is an official C++ API for postgresql?
Technically speaking, the only official C++ api is libpq, which, while
a C API, is C++ compatible. libpxx is a set of wrappers to libpq that
will give you C++ classes
On Mon, Sep 17, 2012 at 7:24 AM, Rafal Pietrak wrote:
> On Mon, 2012-09-17 at 19:58 +0800, Craig Ringer wrote:
>> On 09/17/2012 04:46 PM, Rafal Pietrak wrote:
> [--]
>> There was some quite recent discussion on ELEMENT foreign keys on the
>> -hackers list. Try searching pgsql-hackers f
On Fri, Sep 14, 2012 at 1:47 AM, Pavel Stehule wrote:
> 2012/9/14 John R Pierce :
>> On 09/13/12 10:17 PM, Wells Oliver wrote:
>>>
>>> Do these tend to perform well? I have some simple formulas in functions
>>> like so:
>>
>>
>> if you code your function in SQL instead of plpgsql, and mark it immu
On Tue, Sep 11, 2012 at 11:09 AM, John R Pierce wrote:
> we're still having issues with PG on AIX 6.1, our configurations have no
> ipv6 as our WAN is purely ipv4, but if we use listen_addresses='*', we
> consistently get an error...
>
> LOG: could not bind IPv6 socket: Address already in use
On Thu, Sep 6, 2012 at 10:12 PM, Edson Richter wrote:
> Em 06/09/2012 15:40, John R Pierce escreveu:
>
>> On 09/06/12 5:30 AM, Edson Richter wrote:
You could change the default setting for the user with
ALTER ROLE someuser SET search_path=...
>>>
>>> That is perfect! I can have
On Thu, Sep 6, 2012 at 4:22 PM, Aram Fingal wrote:
> I have a table which currently has about 500 million rows. For the most
> part, the situation is going to be that I will import a few hundred million
> more rows from text files once every few months but otherwise there won't be
> any insert
On Tue, Sep 4, 2012 at 10:39 AM, punnoose
wrote:
> hi all
> How could i use crostab to display variable number of columns. in the output
> There could be variable number of columns
> Regards
> Punnoose
No. The workaround I use is to write a query generator in pl/pgsql
(you can also do it in the
On Tue, Sep 4, 2012 at 6:57 AM, Rebecca Clarke wrote:
> Returns 0 rows.
how in the world did you get yourself in that situation?
merlin
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On Thu, Aug 30, 2012 at 9:34 AM, Scott Marlowe wrote:
> On Thu, Aug 30, 2012 at 6:09 AM, F. BROUARD / SQLpro
> wrote:
>> Le 30/08/2012 12:45, Craig Ringer a écrit :
>>
>>
>>> That's my understanding, but I don't know which other database systems
>>> you're talking about because you've never speci
On Thu, Aug 30, 2012 at 6:42 AM, Alexander Farber
wrote:
> Hello,
>
> I run CentOS 6.3 server with 16 GB RAM and:
> postgresql-8.4.12-1.el6_2.x86_64
> pgbouncer-1.3.4-1.rhel6.x86_64
>
> The modified params in postgresql.conf are:
> max_connections = 100
> shared_buffers = 4096MB
>
On Wed, Aug 29, 2012 at 4:01 PM, Grzegorz Tańczyk wrote:
> Hello,
>
> I have a problem with functional index feature in Postgres 8.3
>
> There are two tables, lets call them: PARENTS and CHILDREN(with timestamp
> column)
>
> I created functional index on parents with function, which selects max va
On Wed, Aug 29, 2012 at 8:52 AM, Chris Travers wrote:
> ALTER TABLE fruit ADD apple_id int;
> ALTER TABLE fruit ADD FOREIGN KEY (apple_id, type)
>REFERENCES apple (fruit_id, type)
>DEFERRABLE INITIALLY DEFERRED;
>
> And then do the same for orange etc. you can then:
>
> AL
On Wed, Aug 29, 2012 at 12:43 PM, Bruce Momjian wrote:
> On Wed, Aug 29, 2012 at 10:31:21AM -0700, Aleksey Tsalolikhin wrote:
>> On Wed, Aug 29, 2012 at 9:45 AM, Merlin Moncure wrote:
>> > citext unfortunately doesn't allow for index optimization of LIKE
>> > q
On Wed, Aug 29, 2012 at 10:56 AM, Nicola Cisternino wrote:
> Il 29/08/2012 17.08, Merlin Moncure ha scritto:
>
> On Tue, Aug 28, 2012 at 9:46 AM, Nicola Cisternino
> wrote:
>
> Hi all,
> I'm valutating a complex porting of our application based on Sybase
> SqlAnywher
On Tue, Aug 28, 2012 at 9:46 AM, Nicola Cisternino wrote:
> Hi all,
> I'm valutating a complex porting of our application based on Sybase
> SqlAnywhere on PostgreSQL (I've love it ...) and I'd like to have your
> opinion about searching/ordering funcionality.
> The problem is about string comparis
On Wed, Aug 29, 2012 at 8:05 AM, Dmitriy Igrishin wrote:
> Hey Jason,
>
> 2012/8/29 Jason Armstrong
>>
>> I have a question regarding the return value of PQfformat()
>>
>> I have a 'data' column in my table, type bytea (postgresql 9.1.5).
>>
>> In postgresql.conf:
>> bytea_output = 'escape'
>>
>>
On Tue, Aug 28, 2012 at 3:25 PM, Dmitriy Igrishin wrote:
> 2012/8/20 Merlin Moncure
>>
>> On Sun, Aug 19, 2012 at 8:14 AM, Dmitriy Igrishin
>> wrote:
>> >> For various reasons, this often goes the wrong way. Views are often
>> >> the right way to g
On Tue, Aug 28, 2012 at 9:29 AM, mithun
wrote:
> Dear Sir,
>
> We are gathering information regarding PostgreSQL open source product
> quality and its community. Can you kindly help me to find following data.
Your questions are incredibly broad, so you're going to get some broad answers.
> 1.
On Mon, Aug 27, 2012 at 11:46 AM, EXT-Rothermel, Peter M
wrote:
> I thought that this was going to be tricky.
>
> Perhaps I could use rules to populate a shadow table that is like a INNER
> JOIN of the two tables. This would consolidate the Boolean on the separate
> table into the same table tha
On Tue, Aug 28, 2012 at 5:34 AM, wrote:
> Hi all,
>
> I´m not sure whether this is the appropriate place to post this but I don´t
> want to keep it back from you: We´re currently looking for a postgres DBA in
> our office in Berlin, Germany.
>
> Here is the link to the job posting:
> http://ww
On Mon, Aug 27, 2012 at 3:46 PM, David Johnston wrote:
> With Chris Travers recently going O-R gung-ho on us I decided I wanted to
> find out where in the documentation the following behavior is specified:
>
> The expression:
>
> (some_composite).calculated_field
>
> resolves to the function call:
On Wed, Aug 22, 2012 at 10:22 PM, Chris Travers wrote:
> I have now been working with table inheritance for a while and after
> starting to grapple with many of the use cases it has have become
> increasingly impressed with this feature. I also think that some of
> the apparent limitations fundam
On Tue, Aug 21, 2012 at 2:56 AM, Craig Ringer wrote:
> On 08/21/2012 03:01 PM, Martijn van Oosterhout wrote:
>>
>> Well, Postgres in principle supports arrays of records, so I've
>> wondered if a relationship join could stuff all the objects in a single
>> field of the response using an aggregate.
On Wed, Aug 22, 2012 at 4:12 PM, Alan Hodgson wrote:
> On Wednesday, August 22, 2012 04:10:01 PM Andrew Hannon wrote:
>> Just looking into High IO instances for a DB deployment. In order to get
>> past 1TB, we are looking at RAID-0. I have heard
>> (http://hackerne.ws/item?id=4266119) there might
On Tue, Aug 21, 2012 at 11:27 PM, Wells Oliver wrote:
> We have a lot of tables which store numeric data. These tables all use the
> numeric type, where the values are 95% integer values. We used numeric
> because it eliminated the need for casting during division to yield a
> floating point value
On Wed, Aug 22, 2012 at 6:06 PM, Nick wrote:
> I have a table with 40 million rows and haven't had any performance issues
> yet.
>
> Are there any rules of thumb as to when a table starts getting too big?
>
> For example, maybe if the index size is 6x the amount of ram, if the table is
> 10% of
On Wed, Aug 22, 2012 at 12:25 PM, elliott wrote:
> Yes, it is a tif file. Uncompressed it is around 85M.
ok, 85 -> 548mb is reasonable considering you have very narrow rows
and an index that covers 2/3 of your column data. if you want to see
dramatic reduction in table size, you probably need
On Tue, Aug 21, 2012 at 12:33 AM, Sébastien Lorion
wrote:
> Hello,
>
> Since Amazon has added new high I/O instance types and EBS volumes, anyone
> has done some benchmark of PostgreSQL on them ?
>
> http://perspectives.mvdirona.com/2012/07/20/IOPerformanceNoLongerSucksInTheCloud.aspx
> http://per
On Mon, Aug 20, 2012 at 2:33 PM, John R Pierce wrote:
> On 08/20/12 11:46 AM, elliott wrote:
>>
>> envdb=# \d astgtm2_n60e073;
>> Table "public.astgtm2_n60e073"
>> Column | Type | Modifiers
>> +-+---
>> lat| real|
>> lon| real|
>> alt| integer |
>
On Mon, Aug 20, 2012 at 9:59 AM, Andreas Kretschmer
wrote:
> salah jubeh wrote:
>
>> Hello Andreas,
>>
>> Thanks for the reply, The example I have posted is very simple and you are
>> right it is very similar to select max (id) from table_that_does_not_exist;
>> But
>> there are more here, for
On Mon, Aug 20, 2012 at 9:37 AM, salah jubeh wrote:
> Hello Andreas,
>
> Thanks for the reply, The example I have posted is very simple and you are
> right it is very similar to select max (id) from table_that_does_not_exist;
> But there are more here, for example imagine I have something like
>
On Sun, Aug 19, 2012 at 8:14 AM, Dmitriy Igrishin wrote:
>> For various reasons, this often goes the wrong way. Views are often
>> the right way to go. +1 on your comment above -- the right way to do
>> views (and SQL in general) is to organize scripts and to try and avoid
>> managing everything
On Fri, Aug 17, 2012 at 5:44 PM, Tom Lane wrote:
> Adam Mackler writes:
>> I notice when I save a view, I lose all the formatting and comments.
>> As I was writing a complicated view, wanting to retain the format and
>> comments, I thought I could just save it as a function that returns a
>> tabl
On Thu, Aug 16, 2012 at 3:54 PM, Wells Oliver wrote:
> Hey folks, a question. We have a table that's getting large (6 million rows
> right now, but hey, no end in sight). It's wide-ish, too, 98 columns.
>
> The problem is that each of these columns needs to be searchable quickly at
> an applicatio
On Tue, Aug 14, 2012 at 12:14 PM, Wolfgang Keller wrote:
>> Can anyone advice about a tool to visualize a database schema?
>
> SQLalchemy, a Python module, can produce dot (Graphviz) output which you
> can load into your favourite diagramming application such as e.g.
> Omnigraffle, yEd or Dia:
>
>
On Sat, Aug 11, 2012 at 7:05 AM, jan zimmek wrote:
> hi,
>
> i am looking into json support of the upcoming 9.2 release and have a
> question about the row_to_json function. is there a way to specify the column
> aliases of a nested composite row without creating a custom type ?
>
> here is an e
On Tue, Aug 7, 2012 at 7:26 PM, Craig Ringer wrote:
> On 08/08/2012 03:45 AM, Merlin Moncure wrote:
>
>> Given that you can do that, if you had the ability to emit json from
>> an hstore the OP's problem would be trivially handled.
>
>
> That's where my thin
On Wed, Aug 8, 2012 at 2:41 PM, Geert Mak wrote:
> hello everybody,
>
> we are trying to move the data from table1 into table2 using a plpgsql stored
> procedure which is performing simple a data conversion
>
> there are about 50 million rows
>
> the tables are relatively simple, less than a doze
On Tue, Aug 7, 2012 at 11:31 AM, Merlin Moncure wrote:
> On Tue, Aug 7, 2012 at 3:20 AM, Craig Ringer wrote:
>> (Reposted as the list manager appears to have eaten the first copy):
>>
>> Hey all
>>
>> It seems to be surprisingly hard to build JSON structu
On Tue, Aug 7, 2012 at 3:20 AM, Craig Ringer wrote:
> (Reposted as the list manager appears to have eaten the first copy):
>
> Hey all
>
> It seems to be surprisingly hard to build JSON structures with PostgreSQL
> 9.2's json features, because:
>
> - There's no aggregate, function or operator that
On Wed, Aug 1, 2012 at 8:09 AM, Alban Hertroys wrote:
> On 1 Aug 2012, at 14:32, dinesh kumar wrote:
>
>> Respected All,
>>
>> This is my first request/post in PG-Generals. If it is not the place for
>> these kind of queries, then please guide me where i need to be.
>>
>> I have a quick question
On Fri, Jul 27, 2012 at 12:06 PM, Tom Lane wrote:
> Ryan Kelly writes:
>> I recently switched from OSX to Linux and \copy in psql no longer
>> accepts multi-line queries. For instance:
>
>> \copy (
>> select
>> *
>> from
>> pg_settings
>> ) to '/tmp/settings.csv' with csv
On Thu, Jul 26, 2012 at 4:32 PM, Little, Douglas
wrote:
>
> Hello everybody,
>
>
>
> For PCI compliance I need to log user access to my PCI columns in a table
> and retain for 2 years.
>
> I know I can grep the log, but with 1m log rows/day and infrequent PCI
> access, I’m thinking this isn’t th
On Thu, Jul 26, 2012 at 11:19 AM, Tom Lane wrote:
> Merlin Moncure writes:
>> On Thu, Jul 26, 2012 at 11:02 AM, Mike Christensen
>> wrote:
>>> I don't really think you'd need to decouple the internal column order
>>> from what the user sees. A REOR
On Thu, Jul 26, 2012 at 11:02 AM, Mike Christensen wrote:
> I don't really think you'd need to decouple the internal column order
> from what the user sees. A REORDER COLUMNS command should re-build
> the table with the columns in the specified order. Internally, it
> should be no different from
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