PostgreSQL is an enterprise class, open-source, object-relational database management system (ORDBMS) available for all major platforms including Linux, UNIX, Windows and OS X. Please mention your exact PostgreSQL version when asking questions.

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pg_dump 9.2.x command does not work with pg_dump 9.2.3

This is how i used to create all the time backups of my databases with PostgreSQL 9.2.x: pg_dump -Fc -Z 6 -U postgres mydatabase > 2013-xx-xx_xxxxx.db However on a machine where PostgreSQL with ...
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1answer
7k views

How to run recurring tasks on a Postgresql database without a cron-like tool?

I would like to call a stored procedure on a regular basis. On Oracle, I would create a job for this. I have found that Postgresql can mimic this well by using an external tool (cron etc) and PgAgent. ...
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1answer
2k views

Why does `pg_lsclusters` not list my Postgres cluster?

I apt-get installed Postgres 9.2.4 (using PPA). I used pg_dropcluster --stop 9.2 main to remove the default database cluster, because I intended on creating a new cluster on a separate SSD volume (a ...
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1answer
337 views

Keeping version history of functions in PostgreSQL

For many of my tables, I've added auditing triggers (based on this wiki page). It works very well and has helped me several times figure out who changed what in the system. We have a Python/Django ...
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1answer
96 views

Force View's query plan to update?

I have a View whose query plan appears to be cached, is there a way to force the View's plan to be recalculated on each access?
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2answers
80 views

Postgresql constrains on FK

I am trying to design a (part of a) database which has to accomplish the following: There is a students table, containing a bunch of students. There are educations in the database. Each student can ...
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1answer
70 views

Need an idea for a complex SQL question

I have had my cup of coffee, but cannot come up with a good solution for the following problem - so I am here to pick your brain. ;-) Here is what I am trying to accomplish (for PostgreSQL): Got a ...
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2answers
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postgres service suddenly not working after the computer crashed while working

I've been working with postgres on a linux server for the last couple of months. Last week, half of our servers crashed and my one with them. I was in the middle of uploading data to the postgres ...
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How to import a text file with '|' delimited data to PostgreSQL database? [closed]

I have a text file with | delimited data that I want to import to a table in PostgreSQL database. PgAdminIII only exports CSV files. I converted the file to a CSV file using MS excel but still was ...
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1answer
212 views

How to avoid large joins when determining which rows a user is authorized for?

Typical wep app situation: you have logged in users querying for resources exposed through an API. As a hypothetical example, company administrators quering for their employees' time sheets: company ...
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3answers
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Postgres connection access denied on IPv6 address

Installed PostgreSQL 9.1 x64 on Windows, set up a listen address, but when connecting with pgAdmin I get the following error. Not sure why PostgreSQL is seeing my IPv6 address and not my regular IP ...
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2answers
870 views

Postgres wont shutdown due to wal archiving

I commanded Postgres to shutdown using the init.d scripts (Linux) over 18h ago. I can still see the processes running: -bash-3.2$ ps -fe | grep postg postgres 2299 3265 0 16:06 pts/5 00:00:00 ...
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1answer
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PostgreSQL insert into table (not origin) based on a condition on fields on different tables

Lets say you have 4 different tables: table_1 is a table holding the original data: table_1 id1 | id2 | score1 | score2 | name_1 | name_2 ...
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2answers
544 views

Run query faster, what index to use

I have a table with 85M rows : CREATE TABLE emissions_totales ( "schema_source" varchar(150), "snap" varchar(20), "gid" varchar(255), "polluant" varchar(50), "emi" float8, "numreg" varchar(3), ...
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1answer
3k views

Algorithm for finding the longest prefix

I have two tables. First one is a table with prefixes code name price 343 ek1 10 3435 nt 4 3432 ek2 2 Second is call records with phone numbers number time 834353212 10 ...
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2answers
662 views

Change built-in default privileges in PostgreSQL?

Introduction. When I create a database, postgres=# CREATE DATABASE test2 OWNER test2; it is created with an empty privileges column: Name | Owner | Encoding | Collate | Ctype | ...
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1answer
570 views

Profiling a PostgreSQL function [duplicate]

if I use explain (analyze true, verbose true, costs true, buffers true) select * from mystoredprocedurefunction(arg1, arg2); I do not get any information about what the server is actually doing ...
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1answer
1k views

Query result with X rows discarded

In a transaction, if I select results to display to the screen, I get the message Query result with x rows discarded. How can I view those results? Something is amiss with my query and I want to see ...
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1answer
244 views

Repairing Broken Binary Replication in PostgreSQL 9.0

I have a binary replication that was stopped for so long that the WALs were removed and as a result, it ended up being old. I'm trying to reestablish the replication and the best way I've found so far ...
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1answer
44 views

When does PostgreSQL write logs?

I turned on the configuration parameter log_planner_stats and would like to examine the details in log. But the log file is empty. It seems all the log files are changed at 12:00am of a day. Does ...
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3answers
482 views

Is using SUM() twice suboptimal?

I know I have to write SUM twice, if I wish to use it in a HAVING clause (or use a derived table otherwise): SELECT id, sum(hours) AS totalhours FROM mytable GROUP BY id HAVING sum(hours) ...
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1answer
112 views

How to select nodes where all children is satisfied?

I have a tree structure of light bulbs. I want to turn on all the light bulbs starting from the leafs of the tree. A light bulb cannot be turned on unless all its immediate children are turned on. ...
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1answer
3k views

pgAdmin3 can't connect properly to Postgres 9.2

I have installed pgadmin3 version 1.10.2, however when it connects to PostgreSQL server version 9.2, it says: Warning: This version of pgAdmin has only been tested with PostgreSQL version ...
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2answers
151 views

Can I limit an index to only contain the newest relevant row?

I have a table in PostgreSQL 9.2 that records login sessions called user_login_session. This table contains a user_id, start_timestamp and end_timestamp columns, amongst others. This table has started ...
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2answers
262 views

How can I increase performance for select in select statement

The item table is like this id category_id name registered I have to show total number of items from the beginning. Suppose between 2013-05-01 to 20-05--05, I have to count all the items ...
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1answer
79 views

Recover PostgreSQL password with admin access to host

Good day. I have a PostgreSQL server. Once i had admin login and password, then i created a new login for web application (with low permissions like select form some tables etc). And i just lost my ...
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2answers
472 views

Can stable (or immutable) functions call volatile functions?

The PostgreSQL documentation states: Any function with side-effects must be labeled VOLATILE... Consider the following function: CREATE OR REPLACE FUNCTION count_items() RETURNS integer AS ...
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1answer
3k views

How can I request a flush of the postgresql transaction logs?

I have the following problem: a "vertical" Linux distribution (Sophos UMT) comes with PostgreSQL 9.2 to store its configuration. Unfortunately, since the last update, it seems that the transaction ...
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2answers
986 views

Join on different types

In a database I have two tables: The first has a field named taxonomy_id that is an integer The latter has a field named ID that is a character varying The two tables are related: if it exists a ...
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2answers
3k views

Postgresql function to create table

I want to create a function in order to create a table with a specific structure pasing part of the name of the table as an argument so the name of the table is t_ . Similar to this: CREATE OR ...
3
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1answer
100 views

Workaround the snapshot isolation in a writable CTE

The postgres docs say: The sub-statements in WITH are executed concurrently with each other and with the main query. Therefore, when using data-modifying statements in WITH, the order in which the ...
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0answers
1k views

Server doesn't listen

I try in Win7 by means of PGAdmin 3 to be connected to a host 192.168.1.8 with the virtual machine with linux. Already which time I receive the message Server doesn't listen The server doesn't accept ...
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2answers
2k views

Postgres 9.2 select multiple specific rows in one query

I have a table with three columns, Id Serial. Value real. timein Timestamp. I want to select the values based on a range of days ie. from two days ago until now. The table may contain one or two ...
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1answer
267 views

How to dive into the PostgreSQL's optimizer and trace each step it takes to optimize the query?

Just like the MEMO structure in SQL Server which is kind of a "paper trail" of steps the optimizer takes in optimizing the query. Does PostgreSQL have the similar structure which records steps the ...
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0answers
792 views

pg_restore and psql asks password for restoring dump file

This will be probably extreme novice question but I want to restore a .backup dump file. I have tried the following command: pg_restore -i -h localhost -p 5432 -U postgres -d old_db -v ...
3
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1answer
648 views

Postgres backup and WAL to S3

We are looking for a solution for the following problem: We have set up streaming replication so we have a master DB and a slave DB, we want to have basebackups and WAL files sent to our S3 storage ...
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2answers
738 views

Approaches for deleting unnecessary records from tables

We have a database which stores the temperatures of 20 thermometer every 7 seconds. We want to delete all records in the way that every minute holds just one tempereature instead of 8 which are older ...
3
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1answer
148 views

Why does postgres use more space for a time with timezone than a timestamp with timezone?

The documentation on date/time data types state that timestamp with timezone takes 8 bytes, while time with timezone takes 12 bytes. They both have the same resolution (1 microsecond), and on the face ...
5
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1answer
226 views

How to schedule PostgreSQL replication?

I was reading postgresql replications solution but, even I just starting understaning how it works, another doubt has arrisen. I'll be using postgres internal replication solution but as far as I ...
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1answer
176 views

How to put one table on one disk and anther table on another (a ramdisk)?

I need to build a database with one table stored on one disk and anther table stored on a different disk (a ramdisk). Is it possible to do it? As far as I know, using two separate databases, one ...
1
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1answer
297 views

Postgresql - how to drop a trigger [closed]

A while ago I've created a trigger in Postgresql, update_user, which sets the update_date to now() for table users. Now I want to drop this trigger. The following queries don't work: drop trigger ...
3
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1answer
5k views

Moving postgresql data directory

I moved postgresql's data directory by following the following steps: Stop postgres cp -a source_data_directory destination_data_directory export PGDATA=destination_data_directory Changing data ...
6
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1answer
203 views

LISTEN / NOTIFY privileges

I have a single postgres database, with two users; Alice and Bob. I would like to be able to do a NOTIFY alice_channel 'sensitive data' without Bob being able to sneakily LISTEN in just by guessing ...
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739 views

How to Change location of postgres cluster and database within the same machine? [duplicate]

I have my present database cluster of postgres at /mnt/my_hard_drive which I want to change to /home/myfolder. I also want to move all my databases present in the present cluster to /home/myfolder. Is ...
2
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0answers
57 views

How to make continues cluster?

I have a report table with the following index: providerid, date The table is around 30M records and it grows about 100K rows per day. I want to use in the index above as a cluster, but as I ...
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1answer
751 views

“relation does not exist” trying to import mysql dump into postgres

environment: ubuntu 10.04 mysql server 5.1.69 postgres 9.2 Here's the sequence of steps: created a new postgres database, myDatabase executed this command: mysqldump -u root -p ...
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0answers
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Performance of large queries on low bandwidth connections

I've been running some measurements on bandwidth needs and the effects of latency on query performance against Postgres 8.3 (waiting for management to approve upgrade) on Windows. SELECTs of various ...
2
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0answers
71 views

Performance of database with transactional data

There are lots of row modifications (several thousands of rows per minute) in our PostgreSQL database that stores transactional data. We have a problem because PostgreSQL runs vacuuming process and ...
1
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1answer
482 views

“Truncate” or “Delete/Vacuum Full” for deleting some of the table rows

I have a db which has 223 tables and I have to delete some of the records from 10 of them, each has apprx. 1.5million records. Those tables are storing the temperatures every 7seconds. We have decided ...
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1answer
709 views

No way to set maximum retrieved rows in pgadmin query tool

I'm using version 1.16.1, and I can't find a "max(imum) rows" param to tweak. Any help would be appreciated.