PostgreSQL is a powerful, enterprise class, open source RDBMS. It has more than 15 years of active development and a proven architecture that has earned it a strong reputation for reliability and data integrity. It runs on all major operating systems, including Linux, UNIX and Windows. It prides ...

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Prevent Primary Key increment when an INSERT statement fail in PostgreSQL

I have a simple table in my PostgreSQL database like this: CREATE TABLE person_type ( id serial NOT NULL, name character(55) NOT NULL, CONSTRAINT person_type_pkey PRIMARY KEY (id), CONSTRAINT ...
2
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0answers
35 views

ST_GeomFromGeoJSON() Causes postgres to crash

I'm running into a strange problem which I can't solve. The server crashes when executing some postgis related queries. After some debugging, using the examples provided by postgis, it appears the ...
1
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1answer
29 views

postgres materialized views and indexes to improve aggregate performance

I have a large table with a number of materialized views used for pre-calculating aggregates. New data is inserted only once a day so think of this as a data warehouse type system. Obviously when I ...
2
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1answer
30 views

SQL Statements truncated in log files

Does PostgreSQL cut statements if there is a subselect in it? We use log_min_duration_statement = 20ms to find statements which need a long time. But unfortunately the statements are truncated: ...
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2answers
49 views

Remove duplicates and connect relations to the first one

Guess I can use some help over here. I have split a products table into two tables, products and prices. This is the original table: products: +----+--------+-----------+-----------+-----------+ | ...
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2answers
20 views

Do Postgres GIN indexes need to be rebuilt periodically?

Do they get bloated like btree indexes? If so how can the bloat be measured e.g. by an automated reindexing script. I am interested in improving query performance and saving space.
2
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1answer
38 views

Marking duplicate records

I have a list of things, some of which are duplicates. create table things ( id int primary key, title text not null, author text not null, duplicate_of int null references things(id) ); ...
2
votes
1answer
520 views

Use GIN to index bit strings

I'm trying to extend PostgreSQL to index bit strings up to 1000 bits. (These bit strings are created by quantization of high-dimensional vectors, so for each dimension up to 4 bits are assigned). ...
1
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1answer
21 views

remove password requirement for user postgres

I understand that, upon installation, PostgreSQL has no password for its db root user (postgres): postgres=# select usename, passwd is null from pg_shadow; usename | ?column? ----------+---------- ...
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2answers
915 views

pgpool replication not allowing md5 authentication

I have installed both pgpool and postgresql via apt. In pgpool.conf, I have made the changes necessary to use replication mode, as well as my two postgresql databases (currently all running on the ...
1
vote
1answer
23 views

How to design tables for airbnb style booking system

all. My English is not very good, but I will try to describe my question as clear as possible. I want to design a airbnb(https://www.airbnb.com) style booking system, this kind of booking system ...
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0answers
28 views

Validate MySQL/PostgreSQL backup without running server [closed]

We have some MySQL/PostgreSQL servers that we already backed up daily. Now we want to validate those backup files to see if any corruption happens. The common way to do this task is just restore the ...
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1answer
45 views

How many rows will be locked by SELECT … ORDER BY xxx LIMIT 1 FOR UPDATE?

As was asked on stackoverflow but then for MySQL, I was wondering how this works in PostgreSQL. How many rows get locked when I do a "FOR UPDATE" in combination with a "LIMIT", a "ORDER BY" and some ...
3
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1answer
74 views

Multi-row insert vs multiple single row inserts

In my app I do multi-row inserts when I can just because it reduces the number of round trips between the db and the app. However, I was curious, is there any other advantages? For example, if ...
0
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1answer
11 views

benefit of using [md5] over [trust] authentication for local Unix sockets

I am following a PostgreSQL installation guide that advises (subsequent to installing the database for the first time), to setup a password for the postgres user: alter role postgres password ...
0
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1answer
21 views

What determines if a bytea has 1 or 4 extra bytes?

When inserting a BYTEA string in PostgreSQL the documentation says that such a string will occupy 1 or 4 bytes plus byte string length. The question that I can't seem to find the answer to is what ...
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0answers
20 views

Error importing postgres DB dump into empty database

I need to import my psql dump into my fresh psql database. When I execute the following command, I get errors. psql -U user new_database < filename.sql Error I got: ERROR: out of memory DETAIL: ...
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1answer
28 views

How to create a tablespace on Windows 7 for Postgresql 9.2?

I try to run this simple command: CREATE TABLESPACE tb_rec OWNER postgres LOCATION 'd:/tablespaces'; However, the tablespace is not created and I got this message: ERREUR: n'a pas pu ...
2
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1answer
78 views

SELECT query with DISTINCT on a table-structure for graphs is very slow

I have 2 tables where nodes contains about 60m rows and edges about 500m rows (both growing fast). These two tables represent a directed graph. CREATE TABLE edges ( node_from bigint NOT NULL, ...
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1answer
30 views

Copying database to different hard disk

Total noob at database administration here, excuse my ignorance. I have a server running a Rails application that's using PostgreSQL. The database is saved on drive /z/, which seems to have filled ...
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1answer
26 views

Does PGStrom calculate relational comparisons?

I prefer index calculation and comparison be executed on the GPU. I have stumbled upon PGStrom. It seems one could infer that it will calculate index comparisons, but the claim doesn't seem to be ...
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2answers
96 views

Assign to NEW by key in a Postgres trigger

In the trigger body, how can I assign a value to NEW by it's field name? That's what I want to do: some_key = "some_column"; NEW[some_key] = 5;
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1answer
28 views

After upgrade from 9.1 to 9.3, commands still point to 9.1

Upgraded from 9.1 to 9.3 on my Ubuntu 12.04 server. Everything worked great but running commands like 'createdb' still runs them from the 9.1 path. /usr/lib/postgresql/9.1/bin/createdb: unrecognized ...
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1answer
20 views

pgbench-tools failed authentication

I'm trying to configure pgbench-tools and went to run it per the README and got this error -bash-4.2$ ./newset 'Initial Config' psql: FATAL: Ident authentication failed for user "postgres" psql: ...
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2answers
18 views

Using pg_dump and psql to transfer table with timestamp into another Db

I am using the following pg_dump and psql command lines through the terminal in order to transfer my table from one database to another. pg_dump -U postgres -t public.table1 database1 | psql -U ...
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1answer
24 views

Why “SET LOCAL statement_timeout” does not work as expected with PostgreSQL functions?

My understanding is that PostgreSQL functions are executed similar to a transaction. However, when I tried to "SET LOCAL statement_timeout" within a function, it did not work. Here's how it works ...
3
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1answer
681 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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35 views

Postgres: Inconsistent DB transaction snapshot [closed]

There are 2 tables - tbl_1, tbl_2 and 2 stored procedures - sp_1, sp_2. sp_1 is used to insert a record into tbl_1. sp_2 is used to insert a record into tbl_2. sp2 will also look for data in tbl_1 to ...
1
vote
1answer
30 views

How can prevent writes to a Postgres schema for a period of time?

I am moving a schema from one server to another using pg_dump + pg_restore + drop schema cascade. I need to know that no applications are writing to it (or at least that the writes will fail) during ...
21
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3answers
35k views

How do I list all columns for a specified table

I'm looking for a precise piece of information in a database which I have no knowledge about. It's a 3rd party product, they are slow on answering some questions, and I know the data is lying inside ...
0
votes
1answer
44 views

copy data from public schema to another schema in postgresql

I'm creating a multi-tenant RoR app using PostgreSQL 9.3.5 running on linux (Ubuntu 14). I'd like to copy the data from my public schema to another schema. I tried: pg_dump -U my_username -h ...
1
vote
1answer
72 views

How to get back the PostgreSQL database to a specific poin in time?

I am running a batch script(10:40) in postgresql database which will insert values in differnt tables on postgresql till (11:00).Later i came to know that the script was executed mistakenly.Now how ...
1
vote
1answer
21 views

Change constraint on column based on value of another

Is it possible to change a constraint on a column in postgres based on the value of another column? E.g. (pseudocode): CREATE TABLE transactions( id SERIAL PRIMARY KEY, type TXN_TYPE NOT ...
0
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0answers
31 views

PostgreSQL queries slower than before?

I am using PostgreSQL 9.3 server on my production server. Everything had been working fine for the past couple of months. But since the past week or so, PostgreSQL seems to have becomes very slow with ...
0
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1answer
25 views

PostgreSQL import XML to empty database, automatically create columns

The server is Linux but the development machine is Windows so I'm using psql command line. I tried \i C:/Users/John/Desktop/Parts.xml which did not work so either \i doesn't work with XML or I'm ...
2
votes
4answers
2k views

Cannot shutdown old postmaster when upgrading to Postgres 9.2

I'm upgrading to Postgres 9.2.2 (from 9.1.4). When I try to upgrade the DBs using: pg_upgrade -b /usr/local/Cellar/postgresql/9.1.4/bin -B /usr/local/Cellar/postgresql/9.2.2/bin -d ...
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0answers
35 views

pgAgent Job's “last result” is continuously “running”

I am using PostgreSQL-9.3 on Ubuntu-14.04 and using "/usr/share/pgadmin3/pgagent.sql" I have configured my pgAdmin3 to use pgAgent. postgres is my maintenance Db and I have run the pgagent.sql content ...
0
votes
1answer
148 views

Problems using “Excel PostgreSQL Import, Export & Convert Software”

I want to export data from Postgresql, and I tried many ways then find the tutorial of Excel PostgreSQL Import, Export & Convert Software on Youtube. I installed the software, but I could not ...
0
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1answer
374 views

pgpool-II configuring multiple master databases

I could not find a solution for this anywhere, not even in the pgpool manuals. How do I configure multiple - master postgresql databases with pgpool-II? Additional requirement is that each master ...
0
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1answer
20 views

Order specific columns in json_agg

I want to sort the rows inside the json_agg function. I found this: PostgreSQL : select columns inside json_agg Which gave me a solution to selecting specific columns for json_agg, but now I want to ...
0
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2answers
415 views

PostgreSQL : select columns inside json_agg

If I have a query like SELECT a.id, a.name, json_agg(b.*) as "item" FROM a JOIN b ON b.item_id = a.id GROUP BY a.id, a.name; How can I select the columns in b so I don't have b.item_id in the ...
1
vote
1answer
105 views

Should one always VACUUM ANALYZE before REINDEXing in PostgreSQL 8.4?

Early in the morning every day a pgAgent job refreshes the contents of table A from table B on my PostgreSQL 8.4 database. Table A contains around 140k records across 91 columns and has two indexes - ...
3
votes
1answer
45 views

Problems while building plpgsql_check on Windows

I try to build plpgsql_check extension by @PavelStehule (Erwin Brandstetter recommended it to me in this answer) on Windows XP 32bit with Visual Studio 2010 (I used this article as a manual). However, ...
3
votes
2answers
91 views

Slow fulltext search due to wildly innacurate row estimates

Fulltext queries against this database (storing RT tickets) seem to be taking a very long time to execute. The attachments table (containing the fulltext data) is about 15GB. The database schema is ...
1
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0answers
40 views

Multiple databases with medium tables or Single database with huge tables

I've developed a shop management software using Postgresql and JAVA. I would like to know which of the solutions below is the best one for my specific situation: Only one database with huge tables ...
1
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1answer
31 views

Will switching from Concrete Table Inheritance to Single Table Inheritance improve the performance of my queries?

I currently have an application that allows people to view and share 10 different types of posts (ex SportsPost, WorldNewsPost, TechnologyPost, etc). All posts types are conceptually the same, but ...
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2answers
81 views

Need help designing a database

We are designing a system which holds statistical parameters about a particular user. As the users use the system the statistics change and the updated statistics are stored in the database. So for a ...
2
votes
0answers
41 views

Cannot drop a Postgres table

I want to drop a few tables in my postgresql database. I am able to drop a few tables but there are 3 tables which I am unable to drop. I need to drop a few tables in my Postgres DB. I tried the ...
1
vote
1answer
283 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" ...
0
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0answers
25 views

Calculate Quantity On Hand By Location

How can I calculate quantity on hand by location and validate the proposed location quantities against inventory transaction? Currently, I do not track location. I calculate total QoH via the ...