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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Postgresql: Query across schemas

I have multiple schemas that I need to query across. The schemas are not know 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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943 views

Debugging why postgres is snowballing with system cpu usage

I am having an issue where my postgres database which run on a dedicated machine is getting hammered with kernal level cpu usage. This essentially takes down the web service that run on this database. ...
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763 views

What PL/pgSQL debugger can I use?

I'm building a lot of PL/pgSQL functions and a debugger would really come in handy because RAISE NOTICE is not enough. I read about a pgAdmin plugin you can install but it was only on Windows and I'm ...
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435 views

Determine the currently executing statement in a long running PL/pgSQL stored procedure

I have a long running PL/pgSQL stored procedure in PostgreSQL. How can I determine the currently executing statement in it?
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1answer
4k views

PostgreSQL High Availability/Scalability using HAProxy and PGBouncer

I have multiple PostgreSQL servers for a web application. Typically one master and multiple slaves in hot standby mode (asynchronous streaming replication). I use PGBouncer for connection pooling: ...
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2answers
920 views

How to take pg_dump of a very large postgres database?

I have a production database server running Postgres 8.4 on Cent OS 6.5.The volume of data has increased recently and within few one month database now has 18500 tables amounting to approx 350GB ...
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1answer
282 views

Choosing A PostgreSQL Authentication Method For A Large Course

I am teaching a first course in databases for the first time. Students will need to have a database management system to which they can connect to do much of their work for the course. I have chosen ...
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1answer
888 views

I need help understanding Postgres's archive cleanup functionality

I'm reading http://www.postgresql.org/docs/9.2/static/pgarchivecleanup.html and to me it seems like it will remove any and all WAL segments from my slave server that aren't required to perform ...
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1answer
315 views

Inconsistent query execution times using trigram indexes?

I have a table residences... I installed trgm: create extension pg_trgm; After adding trigram indexes to both grp and name columns using: CREATE INDEX residences_name_trgm ON residences USING GIN ...
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1answer
589 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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1answer
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In Postgres, How can I merge two tables?

I have a set of web services that all need updating with a new set of static data. I can't use a distributed transaction, but would like to be able to ask each service to rollback it's changes if I ...
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pessimistic locking and client death

We are considering pessimistic locking for our project (SELECT ... FOR UPDATE); as we are used to optimistic locking, we are afraid about the operation of the server being blocked on such a lock (lock ...
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1answer
106 views

PostgresSQL: Get single attribute of UDT in SELECT statement

I created a user-defined type in a PostgreSQL 9.2 database and am trying in the SELECT statement to get only an attribute of the UDT. However, I don't seem to get my code to work. Creation of type ...
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2answers
593 views

Problems executing pg_ctl during pg_upgrade from 9.0 to 9.1 on Windows

I'm trying to upgrade my 9.0 PSQL to 9.1 on Windows Server 2003. I've installed 9.1, stopped both services, and generally followed all steps on this guide. When I actually run the command, however, I ...
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1answer
415 views

Comparing table structure and contents using pg_dump output from two different databases

If I have the output of pg_dump from two different databases, how can I get the difference in structure and contents of all the tables between these two databases?
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1answer
273 views

PostgreSQL Return Joined Results of Select

I'm learning PostgreSQL and was wondering if I can put long selects in stored procedures like this one: CREATE OR REPLACE FUNCTION api.book_list() RETURNS TABLE ( id BIGINT, published ...
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1answer
1k views

SET extra_float_digits = 3

I'm using postgresql 9.2 with my web application that has three servlet with three select. I turn on the log. When i send my first query: 'select * from "Nomi" limit 4' before this the log show me ...
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4answers
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Backup a sample of a PostgreSQL database

Is it possible to back up a PostgreSQL database with only a fraction of the data (1000 Rows from each table)? I am able to back up that database using pg_dump. In some case I need db with minimum ...
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2answers
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Permission denied in file trying to import

When I try to use \i on a file that is not in the psql.exe folder it says C:: permission denied. For example I have a file with SQL command at C:\Users\Work\Desktop\School Work\load_database.sql and ...
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716 views

Tricky selection of grouped rows, selecting based on values of two distinct but related rows

Say I have a table with the following information (sorted here for display purposes) taskid | reference | centreid | date_out --------------------------------------------------- 10001 | ...
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783 views

Dump PostgreSQL schema with foreign keys and referenced data

The official PostgreSQL documentation states that pg_dump can use the --schema=SCHEMA option to selectively dump a given schema. However according to the same documentation (read Note on ...
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1answer
115 views

Storing application settings with different datatypes

I'm developing a web application and I plan to store application settings in the database in name,value fields (one row = one setting). These settings range from directory paths to simple yes/no ...
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1answer
2k views

How to rename a Postgresql cluster?

How do you rename a Postgreql cluster? I googled and found this old web page, which said just to change the name of the directory. I tried it but it didn't work: $ pg_lsclusters Version Cluster ...
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1answer
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querying a linked PostgreSQL database in SQL Server 2008

We will be deploying an application with a Postgres back-end and need to provide report writing capabilities in SQL Server. I am exploring options for real-time or near real-time reporting in this ...
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1answer
2k views

PostgreSQL Scheduled Database Backup

For scheduling a daily back up on a postgres database we execute the following command: 0 2 * * * /usr/local/pgsql/bin/pg_dump -Fp -b -U database_name \ > ...
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1answer
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How do I restore a plain text postgres .backup file

I exported a postgres db from pgAdmin in a plain format because I wanted to search the whole db text. I then tried to restore the database back but it gives an error saying that the archive file is ...
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552 views

Dropped database still shows but causes errors PostgreSQL

I had dropped a database a couple weeks ago but it still shows with \l. I've tried using DROP DATABASE mixmobi_master; and the first time it gave me a confirmation message but mixmobi_master was ...
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PostgreSQL + query planner + amount of entities

I'm working on college work about how query planner uses statistics and makes the most optimal query. I have read the 57.1. Row Estimation Examples article and I know how's the PostgreSQL calculates ...
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1answer
1k views

create index - invalid memory alloc request size

i get this error "invalid memory alloc request size 18446744072635840654. SQL Status:XX000" when i want to create an index. The Table looks like this: CREATE TABLE schema.tblname ( id bigint NOT ...
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1answer
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Copying the database from SQL Server to PostgreSQL

I currently have SQL Server 2005 and I want to make a copy of the entire database into PostgreSQL. I don't want to migrate to new PostgreSQL but just a entire copy. I almost have more than 1 TB of ...
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1answer
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Type conversion with default fallback value

In PostgreSQL (8.4), I'm trying to convert a string parameter into a date within a SQL query, falling back to now() when the string is not a valid date (or empty). In "pseudo-SQL", this would be ...
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1answer
2k views

postgres and passwordless authentication

We have users for out postgres database and none have passwords... Do not know the history behind it. When I try to use clients to connect to these databases, for instance, pgadmin III, the ...
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1answer
617 views

Solution for deploying multiple instances of Django Server with Database replication

have written a Django application that reads / writes data into a postgres database, at the moment I have been deploying one of these devices per client. I am faced with having to deploy multiple ...
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ts_rank massively slows my query, how can I improve performance?

Here's the table definition Table "public.kb_article_contents" Column | Type | Modifiers ------------+----------+----------- article_id | smallint | not null contents | text | not ...
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Removing Archive Logs after PostgreSQL PITR online-recovery

I'm using pgpool-II + PostgreSQL 8.4 on three servers: primary + standby1 + standby2. Replication mode is "on" Load balance mode is "on" (between primary and standby1) I followed the official ...
3
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2answers
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Postgres 8.4 — connection refused (remote)

I'm new to postgres and looking to set up a small environment here with it. I've installed PostgreSQL 8.4 onto an ubuntu server, able to login to the postgres, submit commands, do queries, etc... ...
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1answer
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How to index for timestamp queries

I have a products table where I insert around 150,000 records a day. Most of them are redundant, but I need to keep them because of the new expiration date. I get product feeds from about 5 vendors a ...
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1answer
33 views

Circular dependency in schema or boolean with CHECK?

Let's say I have the following tables: create table repositories ( id serial primary key, name varchar(255) not null ); create table remotes ( id serial primary key, url varchar(255) ...
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1answer
47 views

Migration From Oracle to PostgreSQL Encoding Errors

I'm working on migrating data from an oracle database to a postgresql database. I running into a problem where I export the data from oracle, using sql developer, and importing it into postgresql. ...
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1answer
62 views

INSERT inside PL/pgSQL function gives different result

In PostgreSQL 9.4.1 I have created a custom type my_test_type and have found that doing a basic INSERT with NULL::my_test_type gives an expected result, but with NULL::my_test_type as a function ...
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1answer
230 views

PostgreSql JSONB SELECT against multiple values

I have a very simple JSON table which I populate with some sample data: CREATE TABLE jsonthings(d JSONB NOT NULL); INSERT INTO jsonthings VALUES ('{"name":"First","tags":["foo"]}'); INSERT INTO ...
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1answer
117 views

Why is the CTE much worse than inline subqueries

Im trying to better understand how the query planner work in postgresql. I have this query: select id from users where id <> 2 and gender = (select gender from users where id = 2) ...
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1answer
81 views

PL/pgSQL - Indexes vs Collation vs Pattern Ops

I'm using PostgreSQL 9.3. Having already read articles and answers on DBA stackexchange: Why would you index text pattern ops on a text column PostgreSQL documentation: Indexes - Opclass Pattern ...
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1answer
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Postgresql query plan differs with limit value making the query slower for lower limits

I have this query: SELECT "table_1".* FROM "table_1" WHERE "table_1"."deleted_at" IS NULL AND "table_1"."table_2_id" = 15797104 ORDER BY "table_1"."id" ASC LIMIT 1 The explain for the query ...
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1answer
28 views

Is 'internallength' always useful in custom type definition in Postgres?

In our database we use a custom type to store 3D locations: CREATE TYPE float3d AS ( x real, y real, z real); In many examples I see INTERNALLENGTH used as a parameter with the definition of ...
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1answer
588 views

Index for finding combinations of attributes in JSON array

Based on this related question on SO. This works fine if you only want simple matches. Suppose tracks have both Artist and Title field in the JSON data. So we have something like: INSERT INTO tracks ...
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1answer
153 views

Query with dynamic ranges in PostgreSQL based on status

We have a table with invoices classified per day, with normal invoices and void invoices (invoices that are voided, in our country we use the Spanish term "anuladas"). For example suppose that we have ...
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1answer
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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
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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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1answer
73 views

restarting postgresql quickly

I'm reading over the postgresql admin cookbook. Some of the database server parameters require a restart and with a busy database, you may need to restart quickly. There are a number of things to do ...