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.

learn more… | top users | synonyms (1)

4
votes
1answer
6k views

Very slow DELETE in PostgreSQL, workaround?

I have a database on PostgreSQL 9.2 that has a main schema with around 70 tables and a variable number of identically structured per-client schemas of 30 tables each. The client schemas have foreign ...
5
votes
1answer
2k views

VACUUM returning disk space to operating system

VACUUM usually does not return disk space to operating system, except in some special cases. From the docs: The standard form of VACUUM removes dead row versions in tables and indexes and marks ...
2
votes
1answer
1k views

Create database on new partition

I use postgresql 9.1, on ubuntu 12.04. I had installed the depot package. I have added a new partition to my system, and I would like to create a postgresql database on this partition ( which will be ...
0
votes
0answers
592 views

Create Log file for insert,update and delete records and retrive the log details

How to create/update log file for each modifications(insert,update,delete) in my database. i cant find any feasible methods to achieve so. can anybody know how to implement this.? if so then please ...
0
votes
1answer
686 views

Retrieving all PK and FK

I have a big database that I need to extract all primary keys and foreign keys from each table. I have pgAdmin III. Is there a way to do this automatically and not go over each table manually?
2
votes
3answers
2k views

get account activity in postgresql

I have a old DB with bunch of accounts. One of them is used for sure but for 5 of them or so there is no information. Is there any info in the system table in Postgresql when was the last login or ...
2
votes
5answers
217 views

How to determine if a postgres database needs to be vaccumed?

Given a PostgreSQL database what command can be used to determine if the database needs to vacuumed? UPDATE I am working with client who is evaluating postgres but I am not a DBA, I just happen to ...
6
votes
1answer
169 views

What is a good way to determine the performance I should expect from a PostgreSQL server?

Trying to figure out how I should expect my database to perform. Basically, I need to determine when the server I have set up is reaching its performance limits - which would help me plan server ...
1
vote
1answer
474 views

Postgresql: Difference between pg_dump and backup/restore?

Don't they essentially do the same thing by storing all the data in a file and dumping it into another database? Is it that pg_dump just adds the data on to whatever is already there and restore ...
8
votes
6answers
5k views

Find “n” consecutive free numbers from table

I have some table with numbers like this (status is either FREE or ASSIGNED) id_set number status ----------------------- 1 000001 ASSIGNED 1 000002 FREE 1 000003 ...
1
vote
0answers
485 views

SOLVED: Postgres 8.4.5: Bad query plan vs Good query plan when changing date range on large data table

SOLVED. I was able to resolve this issue by altering the time.date column to allow 1000 stats: ALTER TABLE time ALTER COLUMN date SET STATISTICS 1000; Now the queries are running very fast, down to ...
10
votes
2answers
14k views

Permission denied in Postgres

I added the user myuserto Postgres. Then I added the database mydatabase in the pgAdmin III GUI and restored from a backup file. So the owner of mydatabase is the superuser postgres. Then I tried to ...
4
votes
1answer
194 views

After Rackspace server creation, PostgreSQL query planner doesn't work as expected

We created an image of one of our database servers in Rackspace. Then, we created a new server using that image, expecting things to work. However, the index performance we have seen seems to be ...
2
votes
3answers
2k views

Where are PostgreSQL databases stored on my computer?

So this might be a stupid question, but I'm really new to this. So I'm making a Postgres database on the postgres server, that I started up with this command: sudo -u postgres psql And then I did ...
5
votes
1answer
954 views

Does PgBouncer create a separate pool for every database config entry?

If I set up a pgbouncer.ini config file with several database entries, does pgBouncer create a separate pool for each one? I would think so, but have not been able to confirm this. For example, ...
1
vote
0answers
149 views

postgresql 8.3 possible checkpoint and memory misconfiguration

I am using postgresql 8.3 in a read/write heavy application where data are being written to the database from a background process while they are also being read/written from a web application. At ...
1
vote
1answer
79 views

Postgres Automated Install

Is it possible to automatically create a database after a postgres one click install (from Enterprise DB)?
6
votes
1answer
741 views

How to best use connection pooling in SQLAlchemy for PgBouncer transaction-level pooling?

Using SQLAlchemy to query a PostgreSQL database behind PgBouncer, using transaction-level pooling. What is the best pattern to use for this kind of set up? Should I have one-engine-per-process, ...
5
votes
2answers
685 views

How to properly configure PostgreSQL RAM usage?

Using PostgreSQL, we have several hundred concurrent processes doing regular database access. We have our data spread out through several database servers, each of which houses a connection pool with ...
3
votes
0answers
445 views

How to properly configure pgBouncer transaction level pooling?

What is a good way to determine the number of available transaction connections when using pgBouncer to pool database connections? Also, how should I determine the number of max_connections and ...
2
votes
2answers
770 views

QGIS PostGIS Authentication Failure with “trust” option

I'm trying to setup a PostGIS db using PostgreSQL 9.1 on Ubuntu 12.04. I've set up the database, created a user account "jay" with no password, added spatial functionality following section 2.5 here, ...
1
vote
0answers
786 views

Remote connection to PostgresSQL in Windows 2008 Server is prompting the error below [closed]

The error: Unable to read data from the transport connection. an existing connection was forcibly closed by the remote host. The conditions: I have the following connection string: server = ...
4
votes
0answers
96 views

Postgres TupleTable like data structure

I'm writing my own Group by operator (non-hashed implementation) and I'm currently looking on a good data structure to store the result groups. There are two requirement in my mind: the table need to ...
4
votes
2answers
6k views

How do I remove duplicate records in a join table in PostgreSQL?

I have a table that has a schema like this: create_table "questions_tags", :id => false, :force => true do |t| t.integer "question_id" t.integer "tag_id" end ...
1
vote
0answers
54 views

After streaming replication has failed, how to get it back again?

I have a similar problem to this: Replication has failed; how to get going on again? Essentially my slave failed, and now complains "requested WAL segment 0000000100000135000000E4 has already been ...
4
votes
0answers
1k views

Is there a Postgres admin GUI that can execute a master file containing multiple sql files

I'm developing a really long script. I'd like to break the script into smaller, more manageable scripts and include each sql file in a master file, then just execute the master file. example: ...
0
votes
0answers
996 views

Install PostgreSQL 9.2 on Windows using WIN1252 encoding.

I had installed PostgreSQL 9.2 earlier and it always installed with the encoding being WIN1252 (the default database was WIN1252). I then some time ago reinstalled it with the encoding being UTF8 (I ...
1
vote
2answers
567 views

Performing SELECT on EACH ROW in CTE or Nested QUERY?

This is a problem in PostgreSQL I have a table which stores the tree of users; +------+---------+ | id | parent | |------+---------| | 1 | 0 | |------|---------| ...
4
votes
3answers
339 views

how to chain postgres RULEs?

I have implemented data denormalization strategy using postgresql RULEs. I picked rules instead of triggers for performance reasons. Schema is structured like this: Application has many clients ...
2
votes
3answers
2k views

How can I store a pdf in PostgreSQL

I have to store .pdf files in a table. I have a table, state, with columns: id_state, name, pdffile (bytea) I want to store the pdf files in the pdffile column. How can I do this?
1
vote
0answers
199 views

Does spgist extension in PostgreSQL 9.2.3 support float or int array?

SP-GiST is an abbreviation for space-partitioned GiST in PostgreSQL 9.2.3. It can be used to find the similar tuple by creating the sp-gist index on the column. e.g: create index pt_spgist_idx on ...
1
vote
1answer
61 views

Script to get duration

I am new to PostgreSQL. I am trying to write a query which can give me duration of the time. The fields are in the format yyyymmddhhmmss. In between we will get empty fields for Start_Time or ...
1
vote
1answer
849 views

Postgres copy data with \xYY as plain string instead of interpreting as encoded string

I have a log file full of URLs, generated by Bro IDS. When Bro logs a URL with non-ascii characters in it, it inserts \xYY where YY is the hexadecimal character code. Also, some URLs contain "\x". ...
1
vote
1answer
365 views

How to Reorganize Microsoft Access Table

I have just taken over a retiring DBA's position and is responsible for migrating the current access database to SQL Server or PostgreSQL. Right now, the table structure is a mess. Instead of ...
6
votes
2answers
809 views

What fillfactor for caching table?

I have heavily updated / accessed table where I store serialized java objects. They are in the table for 2-3 hours (also are being updated during that period) and then removed. Size of table is around ...
6
votes
3answers
7k views

PostgreSQL Sequential Scan instead of Index Scan Why?

Hi All I've got a problem with my PostgreSQL database query and wondering if anyone can help. In some scenarios my query seems to ignore the index that I've created which is used for joining the two ...
3
votes
3answers
977 views

What is the best way to store X509 certificate in PostgreSQL database?

I'm working on web authenticate system where users will digitally sign random tokens and this will be checked with X509 certificates stored on the server. Therefore I have to store several X509 ...
0
votes
1answer
376 views

Postgresql Run 'Jobs' At Specific Times

I have a normal problem to anyone that can't trust on applications to do their 'work/ AKA be online' and needs a DB Stored Procedure to run every minute . Scenario : PostgreSQL 9.2 Need To Run A ...
4
votes
2answers
7k views

How should I tune Postgresql for 20 GB of RAM?

I've been fortunate enough to have the use of a 20GB Linode instance running Ubuntu 64 bit. I want to try to optimize PostGres for this service, but I don't know what I should prioritize changing. I ...
0
votes
1answer
525 views

UPPER Case issue postgreSQL when importing from text file

I have ruby and rails app, and I have cron task to download text file and import it to the database using \copy hotels FROM 'db/ActivePropertyList.txt' DELIMITER '|' There is a header field which ...
1
vote
1answer
1k views

PostgreSQL no relations found

I am running ruby and rails app with postgresql database, and I want to do batch import from text file to the database. I've configured the database and if I run psql and \l to list all databases, I ...
0
votes
3answers
8k views

Export Postgres table on remote server to CSV file on local machine?

I have access to DB on remote server where I can do only select command, So, I can execute: COPY products TO '/tmp/products.csv' DELIMITER ','; But on that server I don't have permission to ...
2
votes
1answer
96 views

What is the equivalent of a “Certificate of Destruction” when using a cloud-hosted database?

We have a Rails application hosted by Heroku and using an Heroku Postgres database. Some of the information we store is considered to be sensitive by our users, and we've been asked if we can provide ...
5
votes
4answers
13k views

PostgreSQL user can not connect to server after changing password

I've met this with 4 roles I created: After changing password for a user in pgAdmin III using the GUI (1), that user can not log in any more. pgAdmin III show error message: An error has occurred: ...
2
votes
0answers
652 views

Can PostgreSQL's COPY create CSV with Locale-specific number formatting?

I want to create a CSV with PostgreSQL 9.1 COPY that directly opens correctly with a double-click in crazy German Excel 2010. Using ";"-Delimiter is easy. The encoding is solved, but Excel only ...
4
votes
1answer
232 views

Materialized View PostgreSQL

Is there any possibility of having built-in materialized views in PostgreSQL ? I don't want Gardner version or somehthing like physical table populated by triggers. I've read that was/is something ...
3
votes
2answers
416 views

Running a TPC-C Benchmark Without sleep() i.e. key-in + think time

We are running a TPC-C benchmark against a PostgreSQL 9.2 server using JdbcRunner-1.2 implementation. During first few tests we were not getting a smooth (that is, without sudden spikes down to almost ...
0
votes
1answer
693 views

Configuring Postgres 9.2 streaming replication with Redhat Clustering Suite for High Availability

I'm in the process of configuring PostgreSQL 9.2 streaming replication with Redhat Clustering Suite for high availability. I have 1 master and 1 hot standby configured to replicate the data from ...
1
vote
1answer
2k views

Tuning Postgres config for new Database Server

I have finally gotten a Purpose Built Database machine for a project i'm working on. The server is a 4 Core Xeon with 64GB of Ram and a Raid10 of 10krpm drives. I have just got the database moved ...
5
votes
1answer
1k views

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 ...