All versions of PostgreSQL. Add a version-specific tag like postgresql-9.4 if that context is important.

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Postgres memory usage too low

I have a 400GB Postgres 9.3.4 DB running on Fedora20, and a few indices per table. I have upped shared buffers to 4GB (the system has 16GB available), set shm in the kernel and set the ...
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1answer
46 views

Preparing a former master to run as slave again

I have a streaming replication setup using postgresql 9.3. I have two servers, the master (server_1) and the slave (server_2). The other day I did a failover to my slave (server_2). Now server_2 has ...
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1answer
109 views

How to index WHERE (start_date >= '2013-12-15')

I have a table named items, and inside the table there is a some_date column, with date as the datatype. I was wondering how can I index the some_date column with PostgreSQL SELECT "items".* FROM ...
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0answers
291 views

How to see all queries via pgBadger

The excellent pgBadger has an interface to reviewing specific queries - the slowest, by host, by user etc. Is it possible to see all queries processed, perhaps in a given timeframe. If not available ...
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1answer
3k views

What are the disadvantages of PostgreSQL compared to other DBMS? [closed]

I am a student studying PostgreSQL. I want to know the advantages and disadvantages of PostgreSQL in comparison to other DBMS.
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61 views

Reduce read write delays in specific database setup

I have a database with a large table with 15 columns (type double). It contains a large amount of data (~ 100 rows of data for every second. Holds 3 days of data). I also have a real-time program that ...
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0answers
417 views

Lost all my Postgres database tables? [closed]

I'm a novice using PostgreSQL on a local database that I created using Postgres.app on my Mac. My dbase included multiple related tables with ~50MB of data, and after restarting my Mac (system update) ...
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1answer
53 views

PostgreSQL : send all rows of a table to a function

I have a table with one column (double precision numbers). I also have made a function (with double precision numbers as input and output), and I want to send every value of my table to the function, ...
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0answers
462 views

Howto debug sudden crazy high CPU usage

I'm running postgresql 9.3 on a production server. An hour ago, out of the "blue", I ran into an issue I have never encountered before: my server started to use CPU as crazy. The server is a standard ...
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1answer
617 views

Organizing Postgres Databases

Is there a way in pgAdmin to organize Postgres databases into "folders" or groups? Each Django project I'm creating has it's own Postgres database, and I would like to find a way to organize them. I ...
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6answers
4k views

Efficiently storing irregular/repeating intervals (think calendar/events)

I am developing a service that relies on users being able to recieve messages that they themselves choose. These messages need to be stored somewhere before they are send for processing. Right now ...
3
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1answer
517 views

How to reuse an update trigger for multiple tables in postgresql?

In the database for a new project, I've started the convention of having each table have a last modified timestamp column. To implement this, I wrote a trigger for each table: CREATE TRIGGER ...
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1answer
1k views

Postgresql Database on external HD

I'm completely inexperienced with PostgreSQL, but have to do some work on it, and I have been googling for a solution for almost two days. I hope someone here can help me out. I have a PostgreSQL ...
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0answers
448 views

Granting permissions to PostgreSQL user

I am trying to grant permissions to one of my Postgres users. I am running CentOS with PostgreSQL, Ruby On Rails 3, ruby 1.9.3 postgres=# GRANT ALL PRIVILEGES ON loadmax TO loadmax; ERROR: relation ...
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1answer
262 views

Select Into Regexp_replace doesn't write changes into newly generated table

I have been using this query in postgres 9.1 in order to remove '' from existing data. Below is a sample of the data before running regexp_replace. 6'' 6'' 6'' 20'' 12'' 18'' 20'' 8'' 10'' '' '' ...
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1answer
2k views

Do I need to set tcpip_socket = true to allow remote connections to a postgresql database?

I am trying to enable remote connections to my postgresql 9.1 db running on ubuntu 12.04. This tutorial says to "set tcpip_socket to true" -- but it is for a centos server. I am on ubuntu. I ...
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1answer
334 views

Add 0 into array_agg if there is no matching data

I wrote this view, and it is selecting almost everything I want, but I do not get results for all: project_keywords(which has_many project_report(keyword_id, project_id)) So a project_keyword has a ...
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1answer
47 views

Suggested ways to route traffic between master / slave

I have multiple Postgres servers up, running in master / slave streaming replication mode. I was wondering what the suggested methods of routing write traffic to the master, and the read traffic to ...
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2answers
2k views

What happens in PostgreSQL checkpoint?

Here's part of my checkpoint log: 2014-03-26 11:51:29.341 CDT,,,18682,,532854fc.48fa,4985,,2014-03-18 09:15:24 CDT,,0,LOG,00000,"checkpoint complete: wrote 15047 buffers (1.4%); 0 transaction log ...
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0answers
917 views

database filesystem backup error

I get this error earch time: postgres=# select pg_stop_backup(); NOTICE: pg_stop_backup cleanup done, waiting for required WAL segments to be archived WARNING: pg_stop_backup still waiting for all ...
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3answers
2k views

psql: id SERIAL PRIMARY KEY not starting with 1?

This is something I don't understand, can somebody explain? I create a table CREATE TABLE cali (id SERIAL PRIMARY KEY, ALK_from char, ALK_to char, AND_from char, AND_to char); Then ...
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1answer
79 views

Postgresql view how to do the query

I have 4 tables: Project: id name Keyword: id, name ProjectKeyword: project_id, keyword_id (project has many keywords, keywords has many projects) ProjectReport: project_id, keyword_id, ...
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1answer
66 views

Postgresql create database from backup programmaticly [closed]

I got a big problems here. Let's say I got the table A (with columns like id, name etc) in the main database. So when I making INSERT into A I need to create new database lets say B_id. I got .backup ...
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2answers
445 views

Restoring the superuser account on the postgres server

I have a complete curious situation with a postgres dbms. I have installed the database and due to a misconfiguration of my installation scripts I made the superuser role to be a regular user. Now I ...
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1answer
1k views

Are TCP loadbalancers an alternative to Postgres 9.X read slaves load balancers like pgPool II or pgBouncer?

To scale read traffic on PostgreSQL streaming replication slaves, I want to be able to load-balance the requests. Postgres documentation suggests using tools like pgPool and pgBouncer, but I am ...
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14 views

In Amazon Redshift, running GRANT as a superuser does not grant privileges on table to a regular user [duplicate]

I'm trying to run a query in Amazon Redshift, but I keep getting the error permission denied for relation mytable As far as I understand, this is a privileges issue. According to this question: ...
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1answer
37 views

Splitting metadata inside Postgresql

I have metadata in a postgresql table that I need to split. So far I have been attempting to use Select col_name from "tbl_name" split_part('QGC|WGPLNW|IR|BBC|FCPC|WGPLNW|ARME|QPC', ", 1 | 2 | 3 | ...
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2answers
239 views

Altering db schema in production environment

I have some questions on db schema changes in production environment without taking the database server and the webapp offline. Q1- I want to be able to make changes to database schema (adding, ...
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1answer
159 views

How to ensure a trigger is fired after variable number of inserts?

I have a 1:N relationship between two tables - let's call them "foo" (the parent table) and "bar". I have some triggers on both "foo" and "bar" tables. I insert data in a single transaction, first to ...
3
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1answer
8k views

Postgres is stuck in recovery mode

I have a stand-alone instance of PostgreSQL which is in recovery mode. It has been saying 2014-03-24 18:45:57 MDT FATAL: the database system is starting up For many hours, and ps shows: postgres ...
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1answer
2k views

What is best strategy for backup on streaming replication(hot standby) environment

I have questions. What is best strategy for backup on streaming replication(hot standby) environment. I’d like to do backup on slave server and restore(PITR). First, I set up streaming ...
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1answer
4k views

Postgresql subquery speed much slower than individual queries

In Postgres 9.1. I am attempting to do a single query to get the timezone of a given postal code. I have data loaded in my database, and I am using PostGIS to store the coordinates of each postal ...
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110 views

Recover the postgres data if hard drive fails in CentOs 6

How can I recover PostgreSQL the data if the hard drive fails? I am getting error like error: Invalid Page in block of relation /base/32769/12766 So I have corrupted my entire table - what should ...
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218 views

Unable to send WHERE parameters to subquery

I have the following problem (in PostgreSQL in combination with PostGIS): I have the following nice query who clusters multiple records. Although it uses PostGIS function, my problem is not PostGIS ...
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0answers
123 views

How to distribute a given database between multiple DBMS on a LAN? [closed]

Given a Database D, i need to distribute it over different DBMS in a LAN. D will be split into tables, and each DBMS will store a given table. Here is a sketch of what i need to do : I also need to ...
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2answers
4k views

Query across multiple schemas, unknown until execution time

I have multiple schemas that I need to query across. The schemas are not known in advance, for example: U111 U222 U333 I need to select across these three schemas from a specific table in each of ...
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2answers
874 views

How to do WHERE x IN (val1, val2,…) in plpgsql

I would like to update a selection of rows in a table; this works... UPDATE t1 SET col1 = 'newvalue' WHERE col0 in (2, 4, 5); But how can I do the same in a plpgsql function? The following gives a ...
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0answers
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How to use the result of regexp_split_to_array() in stored procedure [closed]

I'm trying to write a function used by an trigger BEFORE INSERT on a table; the function should convert a raw GPS string to useable columns in a different table. The point where I get stuck is the ...
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1answer
309 views

Aliases with correlated subqueries

I am looking at an example of correlated subquery with aliases from a PostgreSQL book: bpsimple=# SELECT * FROM orderinfo o, bpsimple=# (SELECT * FROM customer c WHERE town = 'Bingham') c bpsimple=# ...
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1answer
95 views

Is there a way to make an OOo form for PostgreSQL updateable view?

I have a PostgreSQL database, with data from some 8 tables (not counting enums implemented as a table referenced by foreign key) summarized in a view. I made an INSTEAD OF trigger, so the view is in ...
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2answers
378 views

how to upgrade and migrate postgres dbs to new server machine?

my production databases run on a centos 5.5 virtual machine. This server has 2 postgres 8.4 clusters installed on 2 different partitions; now my idea is to upgrade both db version and server os ...
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86 views

How to config Enterprisedb work with PostgresXC ?

Util now, I created a cluster (PostgreSQL database + Postgres-XC) with 5 server: 1 GTM, 1 Coordinator, 3 Data Nodes. I intend to create a Enterprisedb (Postgres Plus Advanced Server, link: EDB's home ...
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3answers
2k views

How to SUM previous sum, e.g N = (N-1) + (N-2) + … + 1?

I have a table name "TABLE_A (id integer, no integer)" . I want to sum "no" with group by "id" and current "sum of no" = previous "sum of no" Here is my code : 1/ Create table & insert data: ...
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134 views

What size of hardware/VM for database with over 1,000,000 posts, 20GB?

I am running a Rails application with a Postgresql database. I am exited to say that I am scaling rapidly, and I now have over 1,000,000 posts, not including the User table, in Postgresql(approx ...
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1answer
102 views

How to grant select on a view … based on IP adress?

I wonder if it's possible to allow a client A to "see" some data in a view while allowing any other clients, namely B and C, to see ALL data from the same view. The distinction between A, B and C ...
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1answer
167 views

Does the length of a table name affect performance?

PostgreSQL table names are limited to 63 chars. Is there a performance gain to be had if I limit my table names to something like 5 chars or can I use the full 63 chars without consequence? I ...
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1answer
1k views

INSERT using results of CTE INSERT to provide unique id values

I am writing a job to transform data from an old design into a new design. In this process, I need to take the id from an insert into a separate table and use that in an insert to the target table, as ...
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1answer
8k views

How to convert a unix time to PostgreSQL' Timstamp without timezome?

I have a PostgreSQL database running on a server which has its time zone set to India's Time Zone (i.e. UTC +5:30) I have some data in a table which is created like this: CREATE TABLE "CLOUDDATA" ( ...
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1answer
792 views

Vacuum in postgresql and Purge in mysql

Do the vacuum operation in postgresql and purging operation in mysql perform the same tasks?
5
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1answer
1k views

How to access NEW or OLD field given only the field's name?

I'm writing a validation trigger. The trigger must validate that the sum of an array equals another field. Since I have many instances of this validation, I want to write a single procedure and create ...