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 Performance - Many Large Databases

I run an internal (development) database server containing 25 databases each ~71GB in size. There are usually between 50 and 100 active connections at any given time. What can I do to help improve ...
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34 views

Replication Strategy for Multi-Office Database

I'm considering options for setting up a repository of large spatial datasets that can be used by employees across our company. We have offices scattered around the US. Our employees utilize ...
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27 views

choosing between the slaves on streaming replication

We are building a new streaming replication setup on postgres 9.3 integrated with pgpool for load balancing and failover, and repmgr for replication business. We have seperate daemons running on all ...
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1answer
109 views

PostgreSQL operator uses index but underlying function does not

I'm attempting to use JSONB with JDBC, which means that I have to avoid any of the operators which use the '?' character (as the PostgreSQL JDBC driver has no escaping for this character). Taking a ...
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1answer
86 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
46 views

PostgreSQL: Foreign key on string column

I'm currently in a process of redesigning a legacy database. One of the tables primary key is a varchar(254). I need to create a table relating to it. So for example: create table "Item" ( ...
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17 views

Simplifying UNION query that looks for duplicate names

create table sections( id serial, section_name char(255) not null, version_id int not null ); create table section_versions( id int primary key not null, version_name char(255) not null ); ...
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1answer
42 views

How to store thousands of properties related to a record in PostgreSQL?

I have a database of approximately 300K records. For each of theses records there are up to 1600 related properties. Each of these properties have a simple key=>value format. This data is very static ...
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2answers
42 views

Lower() vs ilike on postgresql

What I want to do is to check if value of column equals some string, but case insensitive. Is there a performance difference when using ilike without wildcards (percents) and lower() ? I was planning ...
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3answers
92 views

Getting around the constraint “column must appear in the GROUP BY clause or be used in an aggregate function”

I'm using Postgres, which enforces the constraint that all columns in a SELECT...GROUP BY must appear in the GROUP BY clause or be used in an aggregate function. Lets say I'm modelling peoples' cars, ...
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1answer
28 views

NOT IN statement or what to use in this case?

I need to delete each row in fabricante_producto_solicitud (fps from now on) table if fps.id has not relation (NOT IN) fabricante_modelo_marca_producto (fmmp from now on). Since my input will be an ...
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1answer
58 views

Maximum sum() of overlapping ranges

Essentially my question is: how does one do aggregate operations involving overlapping ranges in PostgreSQL 9.3 (or 9.4)? The specific problem I have at hand is that given a range, I want to find the ...
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174 views

Problem installing postgres 9.4 on Windows R2

I am trying to install postgres 9.4 on Windows using the "Enterprise db" installer and in the last part of the installation show the message "Failed to initialise the database cluster With initdb". I ...
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34 views

PostgreSQL and array of custom type

One of the table I have looks like this CREATE TABLE orders_suppliers_contacts ( supplier_id bigint NOT NULL, name character varying(64) NOT NULL, phone character varying(18), notes character ...
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1answer
40 views

Safe way to perform DB upgrade

If I am reading the documentation correctly, issuing this command psql -v ON_ERROR_STOP=1 database < script.sql where script.sql starts with BEGIN BEGIN; ALTER TABLE... some other DDL... ...
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2answers
54 views

Efficient query to get last row group by multiple columns

I have a table like the following: spread_id serial NOT NULL, game_id integer NOT NULL, sportsbook_id integer NOT NULL, spread_type integer NOT NULL, spread_duration integer NOT NULL, home_line ...
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1answer
50 views

Use result of aggregate in same select?

Is it possible to feed the result of an aggregate select into the same select with Postgresql? I'm aware of the WITH clause -- but, this would be true syntactical sugar, wouldn't it? SELECT ...
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3answers
72 views

Slow query when adding additional where clause

Here's my setup (Postgres 9.3) Posts project_id Messages post_id kind updated_at I'm trying to get the most recently updated 100 messages that belong to posts (on a specific project) that are ...
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1answer
73 views

Why won't pg_basebackup output go to log?

I run a nightly pg_basebackup from a cron job (Postgres 9.3 on debian "wheezy"), but the backup has been failing. It actually creates output, but the .tar file is corrupt and won't extract. I went to ...
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1answer
44 views

Timeline or time function in PostgreSQL

In MySQL I can use this select which show timeline view on data in my table/tables. SELECT COUNT(atribute), connection_timestamp FROM db GROUP BY DAYOFYEAR(connection_timestamp) ORDER BY ...
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2answers
57 views

PostgreSQL: Use column with hash based on other columns as unique index?

My previous problem is still not fixed: We cannot set a unique index because NULL values are allowed... we use this table in our database: CREATE TABLE offer ( offer_id serial PRIMARY KEY , ...
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1answer
27 views

how to query multiple counts on related tables

For each Forum, there are many Posts, and for each Post, there are many Comments I'm trying to query the total number of Posts and Comments for each Forum So I'm looking to have an output as such: ...
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1answer
38 views

Is there a way to query all error messages in Postgres?

Postgres has a catalogue of possible error messages here: http://www.postgresql.org/docs/8.2/static/errcodes-appendix.html#ERRCODES-TABLE However, I would like to query this information from a ...
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2answers
60 views

Return the id after insert or select

I want to build a function which will insert an email if the email value doesn't exist in the table and return the email_id of the row. How can I do this? Also how can I return the id if the email was ...
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1answer
68 views

How to make a single row result query to return multiple rows

I have the following WITH SQL Query which does select a set of filling stations along a route within the distance of 1000m. To have the measurement in meter I cast the geometries to geography. I also ...
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1answer
56 views

Retrieving latest record using DISTINCT ON is slow [duplicate]

Using Postgres 9.4. I have a table cartests with 5.5M rows. Each row is a car test: \d log.cartests; Table "log.cartests" Column | Type | Modifiers ...
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1answer
229 views

Designing a High Score/Leaderboard table

I'm looking for input on how to design a highscore table for a game I'm creating. The database I'm using is postgres. That's not really something I can or want to change (unless there's very good ...
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1answer
49 views

How does Amazon create the RDS for Postgres? Some kind of Docker?

I am really curious about the infrastructure of Amazon. When I create a new instance of RDS, it gives me a host, username, password.. Everything. Behind the curtains, how do they do this? It´s some ...
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1answer
84 views

Is there a way to insert multiple rows into a table with default values for all columns?

I can insert multiple rows into a table with default values for all columns the RBAR way: create table course(course_id serial primary key); do $$ begin for i in 1..100000 loop insert into ...
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1answer
99 views

Partial unique constraint spanning multiple tables in postgres

To enforce partial uniqueness in postgres, it is a well known workaround to create a partial unique index instead of an explicit constraint, like so: CREATE TABLE possession ( possession_id serial ...
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305 views

Upgrade Postgres 9.3 to 9.4 after Ubuntu 14.04 to 14.10 upgrade

I've just recently upgraded my Ubuntu install from 14.04 to 14.10. This automatically pushed Postgres 9.4 onto the system. I'm trying to migrate my cluster like this: sudo pg_dropcluster 9.4 main ...
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31 views

PostgreSQL timezone setting

While I've spent many years as a SQL developer, I'm not really a DBA, but I'm the closest thing that my company has to one. We have recently started moving many of our PostgreSQL databases from Heroku ...
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1answer
48 views

Inserting into related tables

I have a database setup with the following schema: CREATE TABLE siteInfo ( siteID SERIAL NOT NULL, siteName TEXT NOT NULL, siteHost TEXT ...
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1answer
486 views

Would index lookup be noticeably faster with char vs varchar when all values are 36 chars

I have a legacy schema (disclaimer!) that uses a hash-based generated id for the primary key for all tables (there are many). An example of such an id is: 922475bb-ad93-43ee-9487-d2671b886479 There ...
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1answer
36 views

Pre-existing shared memory block (key 5432001, ID 32768) is still in use

I have been seeing this error lately that is causing the server to crash all of a sudden. I have seen elsewhere that the solution is to delete the postmaster.pid and postmaster.opts files and restart ...
2
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1answer
102 views

How to return a record from function, executed by INSERT/UPDATE rule (trigger)?

I'm having some issue when I'm trying to join two tables in a single view (for migrating code we want to split one big record into two records). I'm using Postgres 9.4! Here is an SQL fiddle. The ...
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24 views

Using Code to Access Database Dump via pgAdmin

I looked over this question on how to import a data dump using pgadmin and found the following code: CREATE OR REPLACE FUNCTION db_to_csv(path TEXT) RETURNS void AS $$ tables RECORD; gmdeclare ...
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1answer
87 views

PostgreSQL and MONEY data type for currency values

For a project, I created a table with a column price MONEY NOT NULL column. And I thought it would handle decimals properly, unlike a floating number (i.e. IEEE rounding issues), but I end up having ...
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1answer
42 views

How do you drop an unnamed check constraint in a PostgresQL table?

I created a PostgresQL table but I added an unnamed check constraint on one of the columns: CREATE TABLE FOO ( id serial primary key, price_range smallint CHECK (price_range > 0), url varchar(255) ...
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2answers
51 views

What indexes should one use to optimize a PostgreSQL query with a JOIN depth of 2?

Disclaimer: I am relatively new to PostgreSQL. I'm wondering how to optimize a query that does 2 INNER JOINs. My scenario is fairly simple: Select Posts with a photo (Posts.photo IS NOT NULL) and a ...
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2answers
165 views

Feasible to have thousands of users in Postgres?

We are creating SAAS where we will at most have 50.000 customers. We are considering creating a user in the Postgres database for each customer. We will map each user that logs into our service to a ...
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1answer
63 views

Free universe tool monitoring all database [closed]

Is there any free tool to monitor most popular databases like Oracle, MySQL, MSSQL, PostgreSQL. I want to monitor the real time performance of all the above mentioned databases with a single tool like ...
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1answer
21 views

synchronizing schemas in server

In production server there's a database per company, with each produced from a single template. CREATE DATABASE company_x WITH TEMPLATE company_template; Let's say I have updated the schema, is ...
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30 views

PostreSQL execute a default query when no row are returned [duplicate]

I need to calculate the average score of a list of userId. I have a table "user_place_score" (user_id / place_id/ score). Sometimes I do not have the score for a user_id so I need to fetch a ...
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4answers
61 views

PostgreSQL execute a default query when no row are returned

I need to calculate the average score of a list of userId. I have a table user_place_score: (user_id, place_id, score) Sometimes I do not have the score (no row for (user_id,place_id) in the ...
3
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3answers
141 views

Clustered index performance consideration in MySQL & PostgreSQL

In MySQL/InnoDB, the clustered index is synonymous with the primary key, so picking up a poor primary key affect your db performance, i.e. use of UUID as PK is a performance killer for database write. ...
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1answer
60 views

PGpool Promote to master and Slaves wont replicate on failure

Sorry for the copy paste from stackoverflow, but this is probably a better place to post this. Version pgpool-II-pg93-3.4.0-3pgdg.rhel6.x86_64.rpm I’ve seen some chat online about this from a ...
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1answer
82 views

Optimise huge Postgres table for fast read

I'm about to create a Postgres table with 1.5 billion rows. The table will just have a single TEXT column. The table is effectively a blacklist. When a user of my software saves certain data, this ...
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2answers
53 views

Can postgresql WAL be regenerated or resent to the standby server?

Does anyone know if there's a way to resend or regenerate a WAL file that was missed by the standby server? During my testing I've gotten into a situation where the main server fails to send a file or ...
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1answer
41 views

How do I determine if pgAgent is installed on a Postgres instance?

I have inherited some problems and I need to determine if pgAgent exists on some number of installations (CentOS) and is running background jobs. These jobs could be run from cron, pgAgent, or an ...