Nabble - PostgreSQL - chat

Database connection error, try to reset the connection parameters

2009-11-05T07:49:50Z

Hi all,
im newbie in here
when im login to some application that connection to postgres
this message show
"Database connection error, try to reset the connection parameters"
any one can help me?
thanks regards
cholid.r

Re: procedureral pgsql

2008-12-18T05:01:58Z

kumar1331 wrote:

hello i have one problem when creating a procedure..
when we are creating variables how to get the stored data from the database...
what the query when we write in that procedure......

procedureral pgsql

2008-12-18T05:00:54Z

hello i have one problem when creating a procedure..
when we are creating variables how to get the stored data from the database...
what the query when we write in that procedure......

how to drop the table data in pgadmin.

2008-04-19T00:58:27Z

hi,I'm using pgAdmin 1.6.3. in Windows XP. here i need help on how can i drop/delete the table data.

errors trying to compile the postgresql

2007-04-27T20:53:44Z

when I try to compile the postgresql, some errors happened.
as I wanto use the default configures, use command ./configure but it turns out get the response:
sh: ./configure: no such file or directory
so what happened? what should i do? thankyou!

Re: hi

2007-03-01T08:38:37Z

On Thursday 01 March 2007 06:16, Ravi Thapliyal wrote:
> I am a new developer in Linux and wants to install latest Postgres on SUSE
> LINUX 10 server.

This mailing list is closed and no regular activity still takes place here. I
would recommend you email either pgsql-novices or pgsql-general in the
future. You can find a list of mailing lists at
http://www.postgresql.org/community/lists/

> The problem I am facing is that
> 1. I am not able to get the binary of latest Postgres 8.2.3 for Suse
> Linux( it is there for only Fedora and Red Hat).
>

I believe binaries from suse are provided from suse directly, so you would
need to look in the suse repositories on the suse website.

> 2. Or what is the procedure to install the latest Postgres on Suse
> Linux 10.

If there arent rpms available, you will have to install from source, but I
would ask you question on pgsql-novice or pgsql-general first as there are
probably other suse users on those lists who can give you better answers.
HTH.

--
Robert Treat
Build A Brighter LAMP :: Linux Apache {middleware} PostgreSQL

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hi

2007-03-01T03:16:16Z

I am a new developer in Linux and wants to install latest Postgres on SUSE LINUX 10 server.

The problem I am facing is that

1. I am not able to get the binary of latest Postgres 8.2.3 for Suse Linux( it is there for only Fedora and Red Hat).

2. Or what is the procedure to install the latest Postgres on Suse Linux 10.

I look forward to hearing from you.

Thanks

Urgent help needed

2007-02-11T22:02:16Z

Hi,

I need to take backup of db from windows and wanna to restore at linux so kindly let me know its command plz, i have tried it a lot but didn;t succeed. also on linux i am not able to take back up so plz also let me know its command

I am very new to postgres n its urgent so plz reply it.

--
Thanking You
Amit Jain
09818450022

Re: Looking for a PostgreSQL Developer

2006-11-26T17:51:35Z

On Nov 22, 2006, at 5:06 PM, Natalie Nash wrote:
> We are looking for a PostgreSQL Developer to assist us

You'll have much better luck asking on pgsql-jobs.
--
Jim Nasby jim@...
EnterpriseDB http://enterprisedb.com 512.569.9461 (cell)

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Looking for a PostgreSQL Developer

2006-11-22T15:06:21Z

Hi,

We are looking for a PostgreSQL Developer to assist us with our conversion from MS SQL2000. Does anyone know of a good developer that could help us in San Diego?

Thanks,

Natalie Nash

Staffing Consultant

Cricket Communications

858-882-9022

www.mycricket.com

Re: graph plottin engines compatible with postgres

2006-07-26T10:00:20Z

Try asking on -general.

On Jun 27, 2006, at 3:12 PM, Parang Saraf wrote:

> hey,
>
> I wanted to know about graph plotting engine that is compatible
> with postgres 8.1.4. I am performing some queries like :
> Comparing the speed of three runners namely A, B and C versus time.
> I want to publish the result in a graphical manner on the net
> instead of just providing the data.
>
> So, if you could provide me with some information on how i can do
> it then that would be great.
>
> thanks and regards
> parang saraf
> parang.saraf@...

--
Jim C. Nasby, Sr. Engineering Consultant jnasby@...
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461

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graph plottin engines compatible with postgres

2006-06-27T14:12:16Z

hey,

I wanted to know about graph plotting engine that is compatible with postgres 8.1.4. I am performing some queries like :
Comparing the speed of three runners namely A, B and C versus time. I want to publish the result in a graphical manner on the net instead of just providing the data.

So, if you could provide me with some information on how i can do it then that would be great.

thanks and regards
parang saraf

parang.saraf@...

Re: [DOCS] [HACKERS] Please Help: PostgreSQL Query Optimizer

2005-12-12T22:46:51Z

Anjan,

> But, in PostgreSQL all costs are scaled relative to a page fetch. If we
> make both sequential_page_fetch_cost and random_page_cost to "1", then we
> need to increase the various cpu_* paramters by multiplying the default
> values with appropriate Scaling Factor. Now, we need to determine this
> Scaling Factor.

I see, so you're saying that because the real cost of a page fetch has
decreased, the CPU_* costs should increase proportionally because relative to
the real costs of a page fetch they should be higher? That makes a sort of
sense.

The problem that you're going to run into is that currently we have no
particularly reason to believe that the various cpu_* costs are more than
very approximately correct as rules of thumb. So I think you'd be a lot
better off trying to come up with some means of computing the real cpu costs
of each operation, rather than trying to calculate a multiple of numbers
which may be wrong in the first place.

I know that someone on this list was working on a tool to digest EXPLAIN
ANALYZE results and run statistics on them. Can't remember who, though.

Also, I'm still curious on how you're handling shared_mem, work_mem and
maintenance_mem. You didn't answer last time.

--
Josh Berkus
Aglio Database Solutions
San Francisco

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Re: [DOCS] [HACKERS] Please Help: PostgreSQL Query Optimizer

2005-12-11T14:06:01Z

Since sequential access is not significantly faster than random access in a MMDB, random_page_cost will be approximately same as sequential page fetch cost.

As every thing is present in Main Memory, we need to give approximately same cost to read/write to Main Memory and CPU Related operations.

But, in PostgreSQL all costs are scaled relative to a page fetch. If we make both sequential_page_fetch_cost and random_page_cost to "1", then we need to increase the various cpu_* paramters by multiplying the default values with appropriate Scaling Factor. Now, we need to determine this Scaling Factor.

Still, i want to confirm whether this approach is the correct one.

On Sun, 11 Dec 2005, Josh Berkus wrote:

> Anjan,
>
>> In our case we are reading pages from Main Memory File System, but not from
>> Disk. Will it be sufficient, if we change the default values of above
>> paramters in "src/include/optimizer/cost.h and
>> src/backend/utils/misc/postgresql.conf.sample" as follows:
>>
>> random_page_cost = 4;
>
> This should be dramatically lowered. It's supposed to represent the ratio of
> seek-fetches to seq scans on disk. Since there's no disk, it should be a
> flat 1.0. However, we are aware that there are flaws in our calculations
> involving random_page_cost, such that the actual number for a system where
> there is no disk cost would be lower than 1.0. Your research will hopefully
> help us find these flaws.
>
>> cpu_tuple_cost = 2;
>> cpu_index_tuple_cost = 0.2;
>> cpu_operator_cost = 0.05;
>
> I don't see why you're increasing the various cpu_* costs. CPU costs would be
> unaffected by the database being in memory. In general, I lower these by a
> divisor based on the cpu speed; for example, on a dual-opteron system I lower
> the defaults by /6. However, that's completely unrelated to using an MMDB.
>
> So, other than random_page_cost, I don't know of other existing GUCs that
> would be directly related to using a disk/not using a disk. How are you
> handling shared memory and work memory?
>
> I look forward to hearing more about your test!
>
>

--
Regards.

Anjan Kumar A.
MTech2, Comp Sci.,
www.cse.iitb.ac.in/~anjankumar
______________________________________________________________
Do not handicap your children by making their lives easy.
-- Robert Heinlein

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Re: [DOCS] [HACKERS] Please Help: PostgreSQL Query Optimizer

2005-12-11T12:41:36Z

Josh Berkus <josh@...> writes:
> I don't see why you're increasing the various cpu_* costs.

You missed the point Josh --- these numbers are relative to the cost of
a page fetch, so if page fetch is measured in microseconds instead of
milliseconds, then you *do* want to bump the CPU costs up.

regards, tom lane

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Re: [DOCS] [HACKERS] Please Help: PostgreSQL Query Optimizer

2005-12-11T11:25:46Z

Anjan,

> In our case we are reading pages from Main Memory File System, but not from
> Disk. Will it be sufficient, if we change the default values of above
> paramters in "src/include/optimizer/cost.h and
> src/backend/utils/misc/postgresql.conf.sample" as follows:
>
> random_page_cost = 4;

This should be dramatically lowered. It's supposed to represent the ratio of
seek-fetches to seq scans on disk. Since there's no disk, it should be a
flat 1.0. However, we are aware that there are flaws in our calculations
involving random_page_cost, such that the actual number for a system where
there is no disk cost would be lower than 1.0. Your research will hopefully
help us find these flaws.

> cpu_tuple_cost = 2;
> cpu_index_tuple_cost = 0.2;
> cpu_operator_cost = 0.05;

I don't see why you're increasing the various cpu_* costs. CPU costs would be
unaffected by the database being in memory. In general, I lower these by a
divisor based on the cpu speed; for example, on a dual-opteron system I lower
the defaults by /6. However, that's completely unrelated to using an MMDB.

So, other than random_page_cost, I don't know of other existing GUCs that
would be directly related to using a disk/not using a disk. How are you
handling shared memory and work memory?

I look forward to hearing more about your test!

--
Josh Berkus
Aglio Database Solutions
San Francisco

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[pgsql-chat] Please Help: PostgreSQL Query Optimizer

2005-12-11T02:45:26Z

I'm working on a project, whose implementation deals with PostgreSQL. A brief description of the project is given below.

Project Description:
--------------------
In Main Memory DataBase(MMDB) entire database on the disk is loaded on to the main memory during initial startup of the system. There after all the references are made to database on the main memory. When the system is going to shutdown, we will write back the database on the main memory to disk. Here, for the sake of recovery we are writing log records on to the disk during the transaction execution.

We want to implement MMDB by modifying PostgreSQL. We implemented our own Main Memory File System to store the primary copy of the database in main memory, and Modified the PostgreSQL to access the data in the Main Memory File System.

Now, in our implementation Disk access is completely avoided during normal transaction execution. So, we need to modify the Query Optimizer of PostgreSQL so that it wont consider disk related costs during calculation of Query Costs. Query Optimizer should try to minimize the Processing Cost. The criteria for cost can be taken as the number of tuples that have to read/write from main memory, number of comparisons, etc.

Can any one tell me the modifications needs to be incorporated to PostgreSQL, so that it considers only Processing Costs during optimization of the Query.

In PostgreSQL, Path costs are measured in units of disk accesses. One sequential page fetch has cost 1. I think, in PostgreSQL following paramters are used in calculating the cost of the Query Path :

#random_page_cost = 4 # units are one sequential page fetch cost
#cpu_tuple_cost = 0.01 # (same)
#cpu_index_tuple_cost = 0.001 # (same)
#cpu_operator_cost = 0.0025 # (same)
#effective_cache_size = 1000 # typically 8KB each

In our case we are reading pages from Main Memory File System, but not from Disk. Will it be sufficient, if we change the default values of above paramters in "src/include/optimizer/cost.h and src/backend/utils/misc/postgresql.conf.sample" as follows:

random_page_cost = 4;
cpu_tuple_cost = 2;
cpu_index_tuple_cost = 0.2;
cpu_operator_cost = 0.05;

Please help us in this regard. I request all of you to give comments/suggestions on this. Waiting for your kind help.

--
Thanks.

Anjan Kumar A.
MTech2, Comp Sci.,
www.cse.iitb.ac.in/~anjankumar
______________________________________________________________
May's Law:
The quality of correlation is inversly proportional to the density
of control. (The fewer the data points, the smoother the curves.)

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Re: Help for converting Oracle Script

2005-10-24T17:47:07Z

On Monday 24 October 2005 15:33, Sawant, Nandu wrote:

> Hello,
> I have following Oracle script and trying to convert it for Postgres
> syntax:
> = = = = = = = = = = = = = = =
> prompt Enter value for monyy (Month Year; Ex-mar02 indicating March
> 2002)
> define MONYY = &monyy
> spool create_new_lerg_&MONYY._accounts.lst
> prompt create user acc_&MONYY.
> create user acc_&MONYY.
> identified by lerg
> temporary tablespace temp
> default tablespace prices
> quota unlimited on prices;
> grant normal to acc_&MONYY.;
> = = = = = = = = = = = = = = =
> If I enter mar02 as a input for the defined variable MONYY, then it
> creates the ACC_MAR02 user in the database. Is there any equivalent for
> "define" statement in Postgres? Your help is appreciated.

I don't think there is a natural equivilant for that in PostgreSQL. More to
the point though, this mailing list is no longer active, so if you want real
help, try posting to pgsql-general.

--
Robert Treat
Build A Brighter Lamp :: Linux Apache {middleware} PostgreSQL

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