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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COPY TO .csv and add quotes to header in PostgreSQL

I use the following in the command line \copy (select id, pid from table1) to '/path/to/file.csv' with delimiter ';' CSV HEADER; Everything works fine. But I want the header's string to be quoted ...
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308 views

How to avoid locking problems while disabling/enabling triggers in a PostgreSQL function?

Whenever I try to disable a trigger from within a function, I get following error: ERROR: cannot ALTER TABLE "datace" because it is being used by active queries in this session It seems logical ...
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1answer
286 views

Is there a way to define macros/alias in psql?

It is somewhat annoying to type EXPLAIN (ANALYZE, BUFFERS, VERBOSE) in psql tool every time you tune queries. So, is there a way to define an aliases (autocompletable ones would be very nice) in psql ...
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1answer
7k views

Postgres: How to insert row with autoincrement id

There is a Table "context". There is an autoincrement id "context_id". I am using sequence to retrieve the next value. SELECT nextval('context_context_id_seq') The result is: 1, 2, 3,...20.... But ...
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1answer
136 views

UPDATE Query replacing string primary key taking days to resolve

I'm working with a DB (not designed by me) that had the primary key set to a 47 character length string, which is causing problems due to the fact that the table has over 20 million rows, and this ...
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1answer
421 views

HStore vs. multiple tables with inheritance - do I have a good use case for HStore?

My broader question here has to do with when it is appropriate to use HStore vs. multiple tables vs. one table for storing document-like objects. Now, for my localized example: I’m designing a ...
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1answer
57 views

Postgresql database backup (and restore) from two servers to third storage place

I have two server machines with PostgreSQL: (A) is version 9.0.15 and (B) version 9.2. I wish to make backups of the databases stored in (A) and (B) - and be able to do restore if needed too! - to a ...
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1answer
300 views

Conditonally create temporary table

Invoking the following SQL leads to a warning 'column "s" has type "unknown"' which I can understand. What I'm trying to accomplish is to conditionally create a temporary in preparation of running a ...
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1answer
717 views

INSERT from a SELECT combined with a single value

I have this query that returns several rows of item_id: select item_id from properties where name like 'body'; And I have the second one that returns 1 row of tag_id: select id from tags ...
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1answer
151 views

Why is vacuum at a critical level in PostgreSQL when I'm running autovacuum?

I just checked the state of vacuum in my PostgreSQL database and it's at a critical level: $ check_postgres --action=last_vacuum POSTGRES_LAST_VACUUM CRITICAL: DB "postgres" DB: postgres TABLE: ...
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1answer
107 views

Postgresql AUTOVACUUM ANALYSE parameters for a specified table

I would like to set autovacuum parameters for a specified table. My problem is that AUTOVACUUM ANALYSE on a small table takes way to long to complete. This table has only 2 columns (including the ...
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1answer
101 views

Restricting Insert and Update to functions

We have a function in postgresql that inserts some rows in a table and updates some other rows based on an input provided by the user. Is it possible to somehow execute the function without giving ...
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1answer
116 views

PostgreSQL replication with fsync disabled?

I need to run PostgreSQL in-memory (for performance reasons), so I intend to disable fsync, which means that no writes will be sent to the WAL. However, as part of my scheme to meet another ...
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25 views

How can I figure out what service is trying to connect as root?

In my postgresql log I see this from time to time: 2014-05-20 12:34:03 CEST FATAL: role "root" does not exist I would not expect any of the services that I have configured to connect as root. How ...
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1answer
286 views

Postgres live backup

Goal: Maintaining a constant live backup of a postgres cluster. In case of cluster failure, backup/Secondary will contain most up to date view of Primary cluster. This is not a hot standby ...
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1k views

Postgres 9.3 64 Bit Windows 7 and 64 bit Postgres install - cleared password no longer connects

Originally I allocated a password to the postgres database, but for some stupid reason the servers are usually setup with a blank password. I then assigned it a blank password in PGAdmin III, and it ...
2
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1answer
120 views

How to create a role that cannot create or alter a table?

I want to create a role named manager in postgresql . This role can update, select, delete and insert data in all tables but users that belong to this role cannot create a table nor modify the schema. ...
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1answer
225 views

Is this inconsistent treatment of `void` return from sql and plpgsql functions documented?

begin; create table foo(id integer); create function f1() returns void language sql as $$delete from foo;$$; create function f2() returns void language plpgsql as $$begin delete from foo; end;$$; ...
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1answer
4k views

Multiple primary keys in PostgreSQL

I have the following table: CREATE TABLE word( word CHARACTER VARYING NOT NULL, id BIGINT NOT NULL, repeat INTEGER NOT NULL ); ALTER TABLE public.word OWNER TO postgres; ALTER TABLE ONLY word ADD ...
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1answer
2k views

SQL query to find all parent records where all child records have a given value (not just some)

An Event has many Participants. A Participant has a field of "status". I need to find all Events except the following ones: Events where every one of its participants has a status of 'present'. I ...
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1answer
408 views

Automatically rollback two-phase transactions on session disconnect

I'm using two-phase commit in Postgres to reliably work with an external system (Amazon EC2). I.e. I first do a PREPARE call, then call the external system. If the external system call fails for some ...
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1answer
224 views

How can I load 'utf8' into plperl by default?

I am attempting to solve a problem explained in another question here. On Debian 7.4 with Postgres 9.1.12, I am able to use the Perl qr operator just fine. On Solaris 5.11 with Postgres 9.2.4, ...
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2answers
577 views

Dynamic UPDATE fails due to unwanted parenthesis around string in plpgsql

Using PostgreSQL 9.3.4 on Mac OSX 10.9.2 with Postgres.app. I want to apply a function to all columns in a table, specifically I want to trim white space. So far I've got this in a file test.sql: ...
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0answers
595 views

PostgreSQL refuses to listen on IP [closed]

This was a case of PEBKAC. By default, the listen_addresses line in postgres.conf is commented out. I failed to notice this and remove the comment. I'm trying to get a PostgreSQL 9.3 server up and ...
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982 views

how to append or update JSON datatype value in postgreSQL

hey guys i'm using PHP's codeigniter to create my application and postgreSQL as database and i have to update some value in database. So, let's say we have table structure like this:- CREATE TABLE ...
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284 views

Error while taking backup in Postgresql

While taking a backup from my PostgrSQL database, it is showing this: pg_dump: Dumping the contents of table "gtab17" failed: PQgetResult() failed. pg_dump: Error message from server: ERROR: invalid ...
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0answers
591 views

Converting a SQL_ASCII database to UTF-8

I have a postgresql (version 8.1) database that has the encoding set to SQL_ASCII, combined with several apps that some are running using UTF8 and some with LATIN1. With this scope I have a database ...
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2answers
251 views

Indexing a large static dataset

My current situation is this: I have 328 million lines of data in a flat csv file. Not optimal. I want to be able to query this data (I'll explain in more detail). Grep is getting tired. This data is ...
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304 views

Mirror database on same server instance for better read performance?

I am developing a somewhat big web application, which uses data which is aggregated using a crawler. The crawler is constantly writing to the database and updates many tables at the same time. For the ...
9
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1answer
366 views

How do I 'hint' the cardinality of a recursive CTE?

I'm using the following recursive CTE as a minimal example, but in general, the optimizer has to use default 'guessed' cardinalities for recursive CTEs: with recursive w(n) as ( select 1 union all ...
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1answer
51 views

Why is logging “slow”?

On an empty transient table, inserting a single row took 50ms before changing it to UNLOGGED, 1ms afterwards. Why is this exactly? If the table structure is necessary, I'll post it, but it's only ...
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1answer
71 views

How do I automatically set meta commands when starting psql?

When I start a psql session, I would like certain meta commands to already be set. For instance: \x auto \set ON_ERROR_STOP on I was hoping to find an rc or config file but couldn't. The command ...
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0answers
176 views

Postgres don't start after an unexpected shutdown

After an unexpected shutdown in postgres 8.4, I'm getting this error. couldn't open the file 'pg_xlog/....'. No such file or directory. invalid primary checkpoint record. Complete message in ...
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1answer
540 views

How can I pg_dump my database while excluding extensions?

I am trying to migrate my PostgreSQL 9.3 database to heroku. My database uses the UUID-ossp contrib extension I am not able to load my db onto Heroku because ERROR: permission denied for language ...
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184 views

Using prepared statements in libpqxx with variable numbers arguments

I am trying to do some streamlining of a PostgreSQL database application. I am collecting data in a real-time setting using a Windows application and libpqxx. I would like to look into using ...
0
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1answer
452 views

Query improvements without UNION

I have the following scenario. A users table, a records table and a memberships table. A user can be associated to zero or more records either directly with the records table records.user_id = ...
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0answers
225 views

pgpool stability issues

I am using pgpool-II 3.3.1 to load balance connections to my postgres 9.3. I am experiencing an ocassional stability issue where clients are not able to connect to pgpool (but they are able to connect ...
2
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1answer
197 views

Easiest way of shutting down a PostgreSQL server on Ubuntu

According to pg_lsclusters I have 2 servers running on Ubuntu 14.04: Ver Cluster Port Status Owner Data directory Log file 9.1 main 5432 online postgres ...
2
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1answer
2k views

Setting password for 9.3 PostgreSQL server [closed]

I currently have a 9.3 server running (on Ubuntu 14.04) with "trust" set as the authentification method in pg_hba.conf. How can I set the password again. In pgadmin the server currently doesn't allow ...
2
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1answer
58 views

How can I enable logging for a single function in PostgreSQL?

I want to log the whole function runtime for a single particular function in PostgreSQL? Is this possible? The value of log_min_duration_statement = 3000 in postgresql.conf and I've tried to do: ...
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1answer
3k views

Authentification failure for PostgreSQL server (9.3)

I can currently not connect to my Postgresql server (9.3) from pgadmin (Running on Ubuntu 14.04). The server according to pg_lsclusters is on port 5433. Ver Cluster Port Status Owner Data ...
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0answers
167 views

PostgreSQL 9.3 slaves don't recognize hstore as a type

I am using the postgres built in replication with two slave nodes and a single master. On the master node (as well as the slaves) the hstore extension is installed. But whenever a query using hstore ...
4
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1answer
4k views

How to remove known elements from a JSON[] array in PostgreSQL?

I'm facing an issue regarding using the JSON data type in PostgreSQL. I try to achieve storing a Java model denormalized in the DB. The model features lists of complex objects. Thus, I decided to ...
2
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3answers
2k views

postgreSQL 9.3 streaming replication delay

I'm running a fairly simple WAL streaming replication setup between two postgreSQL 9.3 servers that are on a private 1Gb LAN, but recently I've noticed that there is an increasing amount of ...
2
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2answers
331 views

Count where previous record exists in either of two tables

I'm trying to COUNT records on one table where both the counted records and their "previous" records exist either in the same table or on another. The table that I'm sampling has a composite PRIMARY ...
2
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0answers
133 views

Postgres: missing disk space after truncate and re-insert

We've got a IP address range dataset stored in a table that was truncated and then re-populated with a slightly modified version of the dataset (almost identical in size). However, after truncating ...
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1answer
776 views

Upgrading using pg_upgrade on windows fails

When upgrading from postgres 9.2 to 9.3 by following the upgrade procedure found in PostgreSQL 9.3.4 documentation about pg_upgrade, the following command fails: RUNAS /USER:postgres "CMD.EXE" ...
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4answers
406 views

Mass data upload from Excel - technology

I am a Developer seeking help in terms of DB technology for a specific requirement. I have done some research but can not conclude with list. Requirement: There will be a web application which will ...
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1answer
40 views

Can an index refer to only one or a subset of possible values?

I am using Postgres. The table looks something like this: tran_id SERIAL PRIMARY KEY, account_id integer NOT NULL CONSTRAINT fk_account_id REFERENCES base.account(account_id) ON DELETE CASCADE, ...
3
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1answer
331 views

How to Substitute Variables in PostgreSQL

The given Oracle query inserts data into table by substituting variables. How I achieve the same in PostgreSQL? INSERT INTO control_threshold ( threshold_id, group_name, description, sql, ...