PostgreSQL is a powerful, open source object-relational database system. It has more than 15 years of active development and a proven architecture that has earned it a strong reputation for reliability, data integrity, and correctness. It runs on all major operating systems, including Linux, UNIX (...

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42
votes
10answers
6k views

PostgreSQL Replication

We constantly bat this around the office, and the question continues to come up. How do you deal with PostgreSQL replication? I'm not even necessarily talking about advanced clusters, just keeping it ...
2
votes
2answers
225 views

How to install Postgres on LINUX with two verions?

I want to upgrade my postgres8.3 to 8.4 for single domain. Don't affect other domain. How to manage it. Is it possible?
220
votes
6answers
399k views

What's the default superuser username/password for postgres after a new install?

I have just installed postgres 8.4 on Ubuntu 9.10 and it has never asked me to create a superuser. Is there a default superuser and its password? If not, how do I create a new one?
41
votes
7answers
48k views

pg_dump and pg_restore: input file does not appear to be a valid archive

I have used pg_dump on one machine and copied result file to another, where I tried to restore it. I believe schema is the same. However, I get: pg_restore: [archiver] input file does not appear to ...
36
votes
6answers
76k views

GRANT SELECT to all tables in postgresql

Is there a one-liner that grants the SELECT permissions to a new user postgresql? Something that would implement the following pseudo-code: GRANT SELECT ON TABLE * TO my_new_user;
3
votes
6answers
887 views

PostgreSQL Tips 'n' Tricks [closed]

This is meant to be a community wiki for collecting together different bits of PostgreSQL knowledge. Nothing is too common or too obscure. Post anything you know that would help others make the most ...
3
votes
2answers
5k views

I think I have multiple postgresql servers installed, how do I identify and delete the 'extra' ones?

I seem to have a few installations of postgresql on my machine somehow. I'm not sure if this is a mistake or, if Ubuntu for some odd reason duplicates direcotories and keeps them elsewhere. I have a ...
19
votes
4answers
8k views

Is PostgreSQL suited to one OS? Is it better on Linux than Windows?

I have been running PostgreSQL on Windows Server 2003 without a hitch and its fast, so to answer my own question it seems fine. However I am about to launch a new project and am considering using a ...
10
votes
3answers
3k views

Extremely Slow IO with Simple PostgreSQL 8.4.4 Queries on Centos 5.5

The strange and extremely slow IO pattern I'm seeing is this (output of iostat -dxk 1 /dev/xvdb1): Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %...
8
votes
1answer
21k views

What's the difference between sudo su - postgres and sudo -u postgres?

PostgreSQL users peer authentication on unix sockets by default, where the unix user must be the same as the PostgreSQL user. So people frequently use su or sudo to become the postgres superuser. I ...
5
votes
4answers
11k views

Postgres cannot start on lion due to missing server configuration file

I am trying to setup pg on a relatively clean lion install and it's not being successful. First I successfully installed homebrew, and installed postgresql without any errors. Then I tried to run a ...
5
votes
1answer
2k views

unable to connect to public postgresql rds instance

I created a basic test PostgreSQL RDS instance in a VPC that has a single public subnet and that should be available to connect over the public internet. It uses the default security group, which is ...
10
votes
1answer
8k views

Can't connect to PostgreSQL on VirtualBox guest

When I try to connect from a PostgreSQL client on the host system to the PostgreSQL server on a VirtualBox guest system, I get a "connection attempt failed" message. The host system is Windows XP. I'...
6
votes
6answers
14k views

Determining PostgreSQL's port

I know that by default PostgreSQL listens on port 5432, but what is the command to actually determine PostgreSQL's port? Configuration: Ubuntu 9.10 with PostgreSQL 8.4
4
votes
3answers
14k views

Setting up Postgres: Can't connect remotely to Postgres server

I am having a problem getting postgres to accept connections from my other server. Here's my setup: APP06 (10.55.129.31): Server running Postgres APP05 (10.55.129.30): Server trying to connect to ...
3
votes
1answer
8k views

How to restart postgresql 8.4 on Debian Squeeze when there are no clusters defined?

How to restart postgresql 8.4 on Debian Squeeze? /etc/init.d/postgresql stop/start/restart does nothing (no output given).
2
votes
1answer
5k views

How do I link a security group to my AWS RDS instance

I have a postgres db setup on RDS. It is running great. However, I want to link this to a set of autoscaled EC2 instances sitting behind an ELB that all reside in a single EC2 security group. I've ...
1
vote
1answer
3k views

Postgres connection establishment slow

If I wan to connect to postgres 9.1.1 db on debian lenny with PgAdmin, it takes >15 seconds until the connection is established. There is nothing to see in the logs why it takes so long. Any ideas ...
1
vote
2answers
3k views

How can I set up an Amazon RDS for PostgreSQL database to act as a replica to a non-RDS PostgreSQL database?

I'm trying to set up an PostgreSQL database on Amazon RDS as a replica to another PostgreSQL database that lives on a regular server. Most of the instructions I've found online require shell access so ...
7
votes
2answers
3k views

Too much I/O generated by postgres stats collector process

I am using XenServer with several virtual machines having local postgres databases. Even when all applications are unused and the databases are idle, each vm causes constant storage network traffic ...
4
votes
1answer
6k views

Postgresql 9.2 “invalid locale name” on Ubuntu 12.04

Today I installed Postgresql 9.2 on Ubuntu precise via apt.postgresql.org – all was relatively painless until I got stuck in a "invalid locale name: it_IT.utf8" error: root@ubuntu:/tmp# sudo -u ...
2
votes
3answers
7k views

Completely reset PostgreSQL to default?

Question Is there a way to completely reset a PostgreSQL installation on Linux, so it is in the same state as when I installed it? Idea I have considered rm -rf /var/lib/pgsql/* rm -rf /var/lib/...
1
vote
1answer
605 views

Can't create clusters in PostgreSQL 9.0

I'm trying to setup and run multiple clusters of PostgreSQL 9.0 in the same Ubuntu/Debian machine. Debian has a package called 'postgresql-common' to facilitate managing database clusters. However, ...
0
votes
4answers
2k views

Reset postgresql

I want to bring postgresql back to its original empty state. On Ubuntu: $ sudo service postgresql stop $ sudo apt-get purge postgresql* Followed by $ sudo apt-get install postgresql Does what ...
0
votes
1answer
2k views

How to set up port forwarding for postgresql listening on localhost?

I have a postgresql instance running on SLES. I want to set it up to listen on localhost, and enable iptables to perform port forwarding. My current configuration postgresql.conf: ...
10
votes
1answer
6k views

How to use a custom status command for a service in puppet?

I am using debian squeeze with PostgreSQL 9.1 from backports. Puppet has version 2.7.14. Unfortunatly the init script returns the wrong exit code for status. Therefore I wrote a custom status command ...
4
votes
2answers
748 views

choosing the right RAID level for PostgresQL database

I got an disk array appliance of 8 disks 1T each (UltraStor RS8IP4). It will be used solely by PostgresQL database and I am trying to choose the best RAID level for it. The most priority is for read ...
2
votes
2answers
944 views

SELinux prevents Apache from writing to pgbouncer's Unix domain socket

I'm using freshly installed CentOS 5.7 Linux 64 bit with PGDG packages: # rpm -qa|grep -i PG postgresql-libs-8.4.8-2PGDG.rhel5 pgdg-centos-8.4-2 postgresql-8.4.8-2PGDG.rhel5 pgbouncer-1.3.4-1.rhel5 ...
2
votes
1answer
457 views

How to upgrade PostgreSQL on EC2?

I have an Amazon EC2 instance running PostgreSQL 9.1. I am pointing to the RedHat repo for PostgreSQL. Now that 9.2 is out, how do I upgrade? This is new to me.
1
vote
1answer
260 views

Invalid byte sequence for character encoding 0x00 after upgrading from 8.3 to 8.4

I'm trying to upgrade a database from PostgreSql 8.3 to 8.4, I backed up the data from 8.3 and restored from 8.4 without issues, but, when I try to use the same program that is working perfectly ...
1
vote
1answer
2k views

Empty error on starting almost-default PostgreSQL

When trying to start PostgreSQL, I get this 'empty' error message: root@mountain-lion:/home/ubuntu# service postgresql start * Starting PostgreSQL 9.1 database server * Error: could not exec /usr/...
1
vote
3answers
12k views

RoundCube login to local IMAP server failing

I've been following this guide to set up a mail server on my server: http://flurdy.com/docs/postfix/edition5.html The only difference is that this tutorial uses a MySQL database and I've used ...
1
vote
1answer
296 views

Backup broken PostgreSQL 8.4 without pg_dump

So. I have a problem. PostgreSQL 8.4 won't start or restart without any output given. But it worked for 3 monthes until hosting provider doesn't rebooted server. Now it is completly broken. It wan't ...
1
vote
1answer
2k views

Trying to determine the correct number of XFS allocation groups for postgresql server on Linux

I am running a postgres 8.4.5 server on the linux 2.6.33.7 kernel on an 8 disk raid array with an LSI controller. Most of the tables are around 1GB or less. I know that XFS uses allocation groups (...
1
vote
2answers
2k views

Crate a new, read-only user in postgres

I would like to create a new user in an existing postgresql database on an Ubuntu machine. I want to grant this user a read-only access to all the tables. How do I do it? Do I need to create a new ...
1
vote
1answer
3k views

Why can't I connect to my PostgreSQL database?

I'm trying to install tentd-admin. The install fails during this step: $ DATABASE_URL=postgres://localhost/tent_server bundle exec rake db:migrate I also tried this: $ DATABASE_URL=postgres://...
0
votes
1answer
897 views

Connect to and reindex Postgres database with system table errors

I've got a Postgres database that crashed (as well as the disk) and suffered some data errors (per http://serverfault.com/questions/156152/after-db-disk-failure-now-cache-lookup-failed-for-index). ...
0
votes
5answers
557 views

how to speed up a database - hardware only

simple question - what is the best way to improve a database's performance using hardware only? in this situation a few very very large tables are being queried very regularly by 1-4 processes at a ...
0
votes
1answer
785 views

Database connection to postgresql refused for flask app under mod_wsgi when started by systemd

I'm having a weird problem where a flask application I am trying to run (https://github.com/pyfarm/pyfarm-master) under mod_wsgi under Apache under CentOS 7 cannot connect to a local postgresql server ...
0
votes
1answer
1k views

postgresql - Approach for 'live'/hot file backup?

Forgive me for the ignorant question, but I see postgres has their WAL logs, and there are talks about using filesystem snapshots, and the WAL with the snapshots may or may not be sufficient backup/...
0
votes
1answer
3k views

Strange permission errors in new PostgreSQL installation

A freshly installed PostgreSQL (with configuration overwritten) won't start: $ sudo service postgresql start * Starting PostgreSQL 9.1 database server * Error: could not read /etc/postgresql/9.1/...
0
votes
1answer
1k views

After DB disk failure, now “cache lookup failed for index”

After resolving some problems with the network drive on which our Postgres database was hosted, we encountered this error: OperationalError: FATAL: cache lookup failed for index 2662 That ...
0
votes
2answers
4k views

postgres on 64 bit linux or 64 bit windows server 2008?

Postgres does not have a 64 bit binary for windows server quote "As there is generally no reason to run with shared_buffers > 256 - 512MB on Windows, there isn't a great deal of incentive to put in ...
0
votes
2answers
786 views

PostgreSQL processes and the signals to which they respond

For PostgreSQL 8.3 and later, what are the processes that make up the server and that respond to a query? What signals do the various processes respond to and what effect do the signals have? What ...
0
votes
1answer
643 views

Why is autovacuum using so much IO when running on a partition's master table after upgrading PosgreSQL from 8.4 to 9.1?

We have an application where we are collecting timestamp-based data. Since a month of data goes over 30M rows (and growing each month), we decided to partition the data on an year-and-month basis. We ...
-2
votes
1answer
730 views

Many Postgresql process. how to handle them?

I'm trying to fix an already install openNMS system on ubuntu. Currently I'm facing issue with postgresql. I stop server using this commnad: service postgresql -$PGVERSION stop after that when i ...