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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How to improve performance on PostgreSQL when using multiple concurrent processes?

Seeing query performance which is not satisfactory on our Python application, which runs several processes that use SQLAlchemy core to access a PostgreSQL 9.2 database. We may have around 100 - 200 ...
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657 views

Postgresql Retrieve / Find Primary Key Serial Autonumber field for Audit logs

I need to find the Primary Key field name in each of a number (approx 70) of tables to create audit logs. All the primary keys are type serial (auto incrementing integer) and all have the name in the ...
5
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1answer
6k views

How many queries per second is my Postgres executing?

How can I tell how many queries per second my Postgres database is executing?
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1answer
720 views

PostgreSQL 9.1 streaming replication problem: replica fails to use an index properly

We use PostgreSQL 9.1.7 on Ubuntu Linux 12.04 on a master server and PostgreSQL 9.1.7 on FreeBSD 9.0-RELEASE on a replica server. The replica and master servers return different results on the same ...
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2answers
279 views

Installing PostgreSQL 9.2 and PostGIS 2.0 on Ubuntu 12

At the current moment, March 4th 2013, can PostGIS2.0 be install with PostgreSQL 9.2? I checked their website and to my understanding it is not possible... I hope that's not the case. Can anyone ...
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2answers
941 views

Versioning data in Databases [closed]

Is there any ready mechanism in Oracle, SQL Server, PostgreSql or OR framework (C#), which can version information in a database? By versioning informartion I mean that e.g. I have table Person (id, ...
3
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1answer
3k views

How to view the current settings of Autovacuum in Postgres?

I've found a million examples of how to set Autovacuum's configuration settings, but can't seem to find how to list the current configuration. Postgres 9.1 is the version I'm most interested in.
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1answer
1k views

Difference between return next and return record

What is the difference between RETURN NEXT and RETURN RECORD in PL/pgSQL? I find the manual quite confusing in explaining what RETURN RECORD actually does. What is a RECORD type?
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1answer
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returning set of records in stored procedure

I would like to return a set of records from a pl/pgsql. Is there a way to do that without using the "for" construct and cursors? For instance when I compared these two stored procedures: create or ...
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0answers
510 views

How to calculate running total based on dynamic values?

I need to calculate the running total in which the target column is changing along with the time. Its something which aws does. Charging based for only what you use. So how do I aggregate sum of ...
2
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1answer
6k views

Declare variable of table type in PL/pgSQL

I am wondering if there is a way to declare a variable of type table in PL/pgSQL to hold query results? For instance how can I express something like: q1 = select * from foo; q2 = select * from bar; ...
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Postgres error ( XX000: invalid memory alloc request size 4294967290 ) [closed]

I'm getting the following error in my postgres 8.4 database: XX000: invalid memory alloc request size 4294967290 Operating System : Windows 7 64 bit Memory : 8GB Database Version: Postgres 8.4 ...
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0answers
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“custom archiver out of memory” error when restoring large DB using pg_restore

I'm trying to a restore a local copy of a 30GB DB (with only one table) dumped using the Heroku wrappers (described here) using pg_restore. The Heroku DB is using 9.1.7 and I have had the same result ...
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2answers
504 views

String handling in postgres 8.4

This started as a question about indexes, but then when I got my answer I realized I would have to try and convert the answer into 8.4 syntax (I can't believe that format does not exist). I thought I ...
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vote
1answer
3k views

postgres GROUP BY and ORDER BY problem

I have two tables like this: CREATE TABLE cmap5 ( name VARCHAR(2000), lexemes TSQUERY ); and CREATE TABLE IF NOT EXISTS synonyms_all_gin_tsvcolumn ( cid int NOT NULL ...
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3answers
283 views

PostgreSQL 7.4 data corruption

We're dealing with the following situation (PG version is 7.4.30): somehow, a DB has gone missing from pg_database (psql \l listing doesn't show it anymore). More, while you can still \c to it, a \d ...
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2answers
166 views

Dumping and restoring on db server - postgres

Is there a way to execute a backup and restore of PostgreSQL DB from App server without calling pg_dump from App server and executing pg_restore also on App server. In this way I'm executing ...
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3answers
15k views

Create index if it does not exist

I am working on a function that allows me to add an index if it does not exist. I am running into the problem that I cannot get a list of indexes to compare to. Any thoughts? This is a similar issue ...
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1answer
1k views

How to get CPU usage of PostgreSQL server?

I'm reading about PostgreSQL monitoring tool. I get a lot of information like database size etc. but can't find info about CPU and memory usage. Are these informations provided by PostgreSQL server or ...
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3answers
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How to pass a table type with an array field to a function in postgresql

i have a table called book CREATE TABLE book ( id smallint NOT NULL DEFAULT 0, bname text, btype text, bprices numeric(11,2)[], CONSTRAINT key PRIMARY KEY (id ) ) and a ...
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1answer
172 views

Single column join vs multicolumn join

In a test with two schemas that conceptually contain the same data I got a bigger performance difference then expected. In one scheme a surrogate key is used which means that in the join condition ...
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1answer
611 views

Truncate table is taking too long in PostgreSQL [closed]

I have many databases on the same server, all with same templates. When I execute truncate command on exceptions table in each database, it works fine and executes immediately but on database named ...
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3answers
2k views

psql asks for password, CREATE USER didn't specify one

I used to have a user, say 'jack' in postgresql, and then I forgot what the password. I reassigned all its ownerships to user postgres, removed the user, and then created it again with CREATE USER ...
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2answers
3k views

Display user-defined types and their details

I've created a few new UDTs in PostgreSQL. However, now I have two problems: how to see which UDTs have been defined? how to see the columns defined within these UDTs? Unfortunately, I couldn't ...
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1answer
111 views

How to tell if database tuning is fruitful (PostgreSQL)

As a DBA, I regularly observe my database, tune up some queries (either getting the programmers to re-write it or add index or update statistics if that's what is needed, etc). I also tune up the ...
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3answers
134 views

Filtering data that could have more than one category

I have a table like the following: Annotation ( document, term, category ) Where document and term are some ID, while category is an integer. The couple document - term is not unique, ...
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2answers
61 views

Postgresql: type_modifier in UDT

In the manual for creating UDTs in postgresql I found the following statement: PostgreSQL allows user-defined types to take one or more simple constants or identifiers as modifiers. However, this ...
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1answer
686 views

multi-master to single-slave replication at table level with PostgreSQL or MySQL

Here is my scenario Master1 hosting DB1 Master2 hosting DB2 ... MasterN hosting DBN replicate to: Slave1 hosting DB1,DB2... DBN I've read similar questions and they recommend to start different ...
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1answer
73 views

Faster joining on 'most recent' related rows

I have a bug tracking application. The bug table stores very little, because every state change to a bug happens by adding a comment. For example, the current state of a bug is determined by the state ...
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2answers
2k views

Select longest continuous sequence

I am trying to construct a query in PostgreSQL 9.0 that gets the longest sequence of continuous rows for a specifc field. Consider the following table: lap_id (Serial), lap_no (int), car_type ...
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2answers
262 views

Slow access to table in postgresql despite vacuum

I'm running PG 8.4 I had a table with about 20K records. Any query accessing this table with more than 1 record (e.g. joins) would be very very slow. Even a count would take like 20 seconds. Stats ...
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1answer
2k views

PostgreSQL 8.4: How to tell if a procedural language is installed or not?

I have a setup program that requires plpgsql to install stored procedures in a PostgreSQL 8.4 database. I need to make sure the language is installed or the app will fail. I don't want to drop the ...
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1answer
178 views

PostgreSQL Hot Standby

I have two PostgreSQL servers running on my local Ubuntu machine (port 5437 is master, port 5438 is standby). While following the tutorial on http://wiki.postgresql.org/wiki/Hot_Standby I get this ...
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2answers
814 views

Why did PostgreSQL choose an elephant as it's logo?

Why did PostgreSQL choose an elephant as it's logo? It wasn't clear from logo wiki. UPDATE: Now wiki updated :) Thanks!
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2answers
612 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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3answers
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Should I manually VACUUM my PostgreSQL database if autovacuum is turned on?

I use software which makes a big PostgreSQL database (there is a table with a million rows in it) and the developers says I should VACUUM and ANALYZE periodically. But the PostgreSQL database default ...
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2answers
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Why is a new user allowed to create a table?

I'm wondering why a newly created user is allowed to create a table after connecting to a database. I have one database, project2_core: postgres=# \l List of ...
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1answer
793 views

Database encryption and key management with pg_crypto

I am looking at the possibility of having to store root passwords for virtual machines in reversibly encrypted format in a database. The reason is that local logins will sometimes be required to ...
2
votes
1answer
131 views

Tools and methodologies to keep to DBs aligned [closed]

2 DBs having schemas that represent the same semantic objects. The first one is production DB (Non-RDBMS, in-house implemented in-memory DB with shitload of RAM). Other is Postgres. Once in a while ...
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1answer
123 views

Does PostgreSQL optimize queries in transaction?

In my app I need to make big imports from user files, and to achieve that all records are updated/created I do it inside transaction. But before it I need to update massive, already existing in DB, ...
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1answer
284 views

Undefined reference to my function [closed]

I'm working on a project on postgresql 8.4 server side. I'm adding some functionality in order to store some query informations. I need to call two functions (start_create_profile() and check()) ...
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3answers
403 views

Altering same table across multiple databases

I have multiple databases on the same instance and I am in the process of updating a table schema that must propagate across all the databases. I am not sure I know what the right procedure for this ...
3
votes
2answers
3k views

issues with encoding and pg_dump/restore between windows and linux

I have a dmp file I have created using pg_dump encoded in WIN1252. What I would like to do is import it using pg_restore to a database on a Linux machine. The problem is that on the windows machine ...
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0answers
285 views

Connecting a GUI to the user-created function in PostgreSQL [closed]

I have been given a task to create profiles for the applications. The Database that we use is Postgresql. I've defined some function that will give me those profile and I've added them to the ...
0
votes
1answer
709 views

trying to start a newly created cluster in postgresql on windows

I just created a new postgresql cluster in postgres 8.3 and looks like everything worked. What I am having issues with is trying to start the server of this new cluster. My two clusters are on ...
2
votes
1answer
195 views

Postgresql server causing a lot of IO activity

I have a postgresql server running on a small linode partition. It is running a web app for a site which gets on average 0 users / minute (it has not launched yet). At one point, I loaded up the ...
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0answers
279 views

PostgreSQL can't start after tuning some options

I'm having some issues with "too many clients" and I tried to change the max_connections param (currently 100). I tried to set some value like 300, but when I restart the service, I got this ...
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1answer
108 views

Partition of tablespace [closed]

My postgres server is running in a windows server and three tablespace are created. Postgresql server is installed in C: drive and the tablespaces are in D: and E: drive. So how to take a backup and ...
6
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1answer
478 views

Storing logs on per day basis in PostgreSQL

Requirements here are to store historical logs. For the sake of simplicity I'll assume this sample scenario where we are selling some products on our website and we need to keep records of sales of ...
2
votes
1answer
2k views

PostgreSQL server log connection message [closed]

I'm seeing the following message in PostgreSQL server log: LOG: could not receive data from client: No connection could be made because the target machine actively refused it. There are ...