Re: [GENERAL] Why count(*) doest use index?

2011-03-06 Thread Allan Kamau
On Sun, Mar 6, 2011 at 1:46 AM, John R Pierce wrote: > On 03/05/11 2:05 PM, Allan Kamau wrote: >> >> Is it possible in theory to efficiently perform count the primary or >> unique indices underlying data structures, regardless whether there is >> a WHERE clause detailing filtration base on values

Re: [GENERAL] Web Hosting

2011-03-06 Thread Brent Wood
Rimu hosting allows you to install whatever you want, including Postgres... which I have done before now. If your project is in support of Open Source software in any way, ask what discount they can offer, they have been pretty generous in that arena. http://rimuhosting.com/ Like many hosting com

Re: [GENERAL] Question about switchover with PG9 replication

2011-03-06 Thread Jean-Armel Luce
Hello, Thanks for all your answers. I have read that the cascaded replication will be probably available in future releases (cf. http://wiki.postgresql.org/wiki/Streaming_Replication#Synchronization_capabilityat the bottom of the page) As I understand the streaming replication, we are able to h

Re: [GENERAL] Why count(*) doest use index?

2011-03-06 Thread Martijn van Oosterhout
On Sun, Mar 06, 2011 at 11:03:23AM +0300, Allan Kamau wrote: > I would assume the primary key or unique indexes are the cornerstone > of each insertion and deletion. > Or am I missing a crucial point. The real issue is that you can have four programs all doing count(*) and all getting different

Re: [GENERAL] Why count(*) doest use index?

2011-03-06 Thread Alban Hertroys
On 6 Mar 2011, at 9:03, Allan Kamau wrote: > If this is true it seems that the primary key and perhaps other unique > indexes do indeed contain exact details of the uniqueness of the > persisted tuples of a given relation at any given time. That is true within a single transaction, but indexes co

[GENERAL] Copying few tables from one database to another

2011-03-06 Thread Alexander Farber
Hello, what is please the command to copy tables from 1 database from another and is it possible at all without using pg_dump? I'm trying to migrate 4700 users from phpBB 3 to Drupal 7 and have few custom tables in the "phpbb" database which need to be copied over. Using CentOS 5.5/64 bit + Post

Re: [GENERAL] Copying few tables from one database to another

2011-03-06 Thread Vibhor Kumar
On Mar 6, 2011, at 7:13 PM, Alexander Farber wrote: > what is please the command to copy tables from 1 database > from another and is it possible at all without using pg_dump? You can create Structure of table in New database and then you can use COPY Command to copy data as given below: psql

Re: [GENERAL] PHP array to PlPgSQL arrat. How to?

2011-03-06 Thread Andre Lopes
Hi, Just another question about this subject. It is possible to compare if these 3 PlpgSQL arrays have the same number of elements? How to get the number of elements of an PLpgSQL array? NOTICE: file types: {image,image,image,image,image} NOTICE: file details: {type,width,height,html_width_hei

Re: [GENERAL] PHP array to PlPgSQL arrat. How to?

2011-03-06 Thread Pavel Stehule
Hello look on array_lower and array_upper functions http://www.postgresql.org/docs/8.2/static/functions-array.html for one dimensional arrays - select array_upper(var,1) - array_lower(var,1) Regards Pavel Stehule 2011/3/6 Andre Lopes : > Hi, > > Just another question about this subject. > > I

Re: [GENERAL] PHP array to PlPgSQL arrat. How to?

2011-03-06 Thread Andre Lopes
Hi Pavel, Thanks for the reply. It was exactly that that I'm looking for. Best Regards, On Sun, Mar 6, 2011 at 3:05 PM, Pavel Stehule wrote: > Hello > > look on array_lower and array_upper functions > > http://www.postgresql.org/docs/8.2/static/functions-array.html > > for one dimensional arr

Re: [GENERAL] School teacher in need of HELP

2011-03-06 Thread Cia Watson
On Sat, 5 Mar 2011 15:33:50 -0500 wrote: > Hello, I tried to enter the commands on the SQL Shell(psql) from > which line 1 reads Server [localhost], line 2 –Database[postgres]: > and I entered postgres, line 3 – Port[], which number I entered), > line 4 - Username[postgres], where I entered

Re: [GENERAL] Web Hosting

2011-03-06 Thread Reid Thompson
On 3/5/2011 4:08 PM, matty jones wrote: I already have a domain name but I am looking for a hosting company that I can use PG with. The few I have contacted have said that they support MySQL only and won't give me access to install what I need or they want way to much. I don't need a dedicated

[GENERAL] regarding ROW comparisons

2011-03-06 Thread Jon Nelson
I am working with a system which periodically has to perform this operation: update all of the rows in table A which match rows in table B, using a subset of the columns for comparison (and one of the columns in tableA is NULL). This is what I've tried: update tableA SET column1 = some_value FRO

[GENERAL] How to Create Table from CSV

2011-03-06 Thread ray
I would like to create a table from a CSV file (the first line is headers which I want to use as column names) saved from Excel. I have a new database which I have been able to create tables from a tutorial. But I haven’t been able to produce this new table. The following are my attempts: CREAT

Re: [GENERAL] How to Create Table from CSV

2011-03-06 Thread Vibhor Kumar
On Mar 7, 2011, at 12:13 AM, ray wrote: > > CREATE TABLE Equpment_List_Sheet2 FROM 'Equipment List, reference > r1_Sheet2.csv' WITH DELIMITER ',' NULL '' CSV HEADER; > ERROR: syntax error at or near "FROM" > LINE 1: CREATE TABLE Equpment_List_Sheet2 FROM 'Equipment List, > refe... > > ^ >

Re: [GENERAL] How to Create Table from CSV

2011-03-06 Thread Rich Shepard
On Sun, 6 Mar 2011, ray wrote: I would like to create a table from a CSV file (the first line is headers which I want to use as column names) saved from Excel. I have a new database which I have been able to create tables from a tutorial. But I haven?t been able to produce this new table. The

Re: [GENERAL] Web Hosting

2011-03-06 Thread Eduardo
At 17:24 06/03/2011, you wrote: On 3/5/2011 4:08 PM, matty jones wrote: I already have a domain name but I am looking for a hosting company that I can use PG with. The few I have contacted have said that they support MySQL only and won't give me access to install what I need or they want way

Re: [GENERAL] Finding Errors in .csv Input Data

2011-03-06 Thread Dimitri Fontaine
Rich Shepard writes: > I'm sure many of you have solved this problem in the past and can offer > solutions that will work for me. The context is a 73-column postgres table > of data that was originally in an Access .mdb file. A colleague loaded the > file into Access and wrote a .csv file for me

Re: [GENERAL] Covert database from ASCII to UTF-8

2011-03-06 Thread Dimitri Fontaine
Jeff Amiel writes: > It's come time to bite the bullet and convert a half-terraybyte database > from ASCII to UTF8. Have gone through a bit of effort to track down the > unclean ascii text and repair it but would like to avoid the outage of a > many-many hour dump-restore. Those blog articles of

Re: [GENERAL] FTS and words near one another

2011-03-06 Thread Dimitri Fontaine
Arturo Perez writes: > Is there currently anyway in 9.0 to use FTS to search for words that are > next to each other? Oleg and Teodor worked on that at some point and they call it phrase search. I don't think it's been commited yet, you can see reference material in their presentation at pgcon

Re: [GENERAL] Why count(*) doest use index?

2011-03-06 Thread Glenn Maynard
On Sun, Mar 6, 2011 at 5:41 AM, Martijn van Oosterhout wrote: > If it's really really important there are ways you can use trigger > tables and summary views to achieve the results you want. Except it's > expensive and when people are told that all of the sudden the count(*) > performance isn't so

Re: [GENERAL] How to Create Table from CSV

2011-03-06 Thread Dimitri Fontaine
ray writes: > I would like to create a table from a CSV file (the first line is > headers which I want to use as column names) saved from Excel. I have You have to manually create the table and its columns, as other said. The tricky part that is hard (or impossible) to automate is deciding which

[GENERAL] Composite index structure

2011-03-06 Thread Nick Raj
Hi all, I want to construct an "Composite Index Structure" i.e. a combination of gist and btree. What i am thinking is that first creating a Rtree structure that is pointing to another Btree structure. For example, Suppose i want to find vehicles between 2 to 4 pm on 14/2/2011 on X road. I am thi

Re: [GENERAL] Finding Errors in .csv Input Data

2011-03-06 Thread Rich Shepard
On Sun, 6 Mar 2011, Dimitri Fontaine wrote: Did you try pgloader yet? Nope. I did determine the reasons and fixed them so all rows read into the table. Thanks for the suggestion, Rich -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscrip

[GENERAL] Deleted database from pgAdmin

2011-03-06 Thread akp geek
Hi all - wanted to check, if it is possible to recover the database, if it is deleted using the pgAdmin. I know it is not possible. Just wondering . We don't have back either :( Regards

Re: [GENERAL] Deleted database from pgAdmin

2011-03-06 Thread Adrian Klaver
On Sunday, March 06, 2011 4:24:56 pm akp geek wrote: > Hi all - > >wanted to check, if it is possible to recover the database, > if it is deleted using the pgAdmin. I know it is not possible. Just > wondering . We don't have back either :( Just to be sure you actually deleted the

Re: [GENERAL] How to Create Table from CSV

2011-03-06 Thread ray joseph
I appreciate all the information Thank you, ray -Original Message- From: Dimitri Fontaine [mailto:dimi...@2ndquadrant.fr] Sent: Sunday, March 06, 2011 3:19 PM To: ray Cc: pgsql-general@postgresql.org Subject: Re: [GENERAL] How to Create Table from CSV ray writes: > I would like to crea

Re: [GENERAL] School teacher in need of HELP

2011-03-06 Thread Rob Sargent
hbaile...@nyc.rr.com wrote: Hello, I have no IT experience and no funding to hire a technical person or resources to take a training course. Also my friends who have programming background have not been reliable. I am willing to spend the necessary months in trying to learn how to use an SQL