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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40 views

cascade delete doesn't work even though constraint is added

I created the following table: CREATE TABLE message_link ( id serial NOT NULL, thread_id integer, message_id integer, user_id integer, read boolean NOT NULL, CONSTRAINT message_link_pkey ...
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1answer
20 views

PostgreSQL synchronous replication time out?

I'm using PostgreSQL 9.3 with synchronous replication. I have 2 synchronous replicators and 1 async replicator. My problem is when 2 synchronous replicators are down, transaction will wait ...
1
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1answer
15 views

Grant usage partially on schema to user on Postgres

I granted INSERT in a specific table for one user. The problem is that I need to also grant USAGE in the schema for this same user, but granting USAGE in schema also turn all relations in that schema ...
0
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0answers
16 views

Which primary keys must be specified when using slony PostgreSQL replication?

I'm extremely green when it comes to databases, so forgive my ignorance. I've been researching ways to replicate our production Postgres DB, and I've decided to try out Slony. Since the server is ...
1
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1answer
33 views

PostgreSQL Slave has more files in pg_xlog than /wal_archive

Background: for various reasons I am switching PostgreSQL Slave from a Streaming replication to a warm standby replication. The streaming replication was setup using this guide: ...
1
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1answer
54 views

How to optimize multiple ORDER BYs?

I'm getting sluggish performance on a table with ~300,000 rows and B-Trees on each column. This is for a dynamic pagination page where the query is constructed on demand, and the application caches ...
7
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0answers
103 views

Busy table is not getting vacuumed

We're using Postgres 9.2 on Windows to store low-frequency timeseries data: we're inserting around 2000 rows per second every second 24 hours, 7 days a week with no downtime. There is a DELETE that ...
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0answers
14 views

Understanding correct procedure to recover master in master-slave replication in PostgreSQL

For learning, I have setup master-slave streaming synchronous replication. Pg-pool 3.3.3 is installed in one VM and it connect to 4 VMs which runs PostgreSQL 9.3, one master and 3 slaves. Replication ...
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2answers
70 views

How can I make this query more efficient?

This is the query: SELECT races.*, tmptimers.last_start_time, tmplaps.updated_at AS last_updated_at FROM races LEFT JOIN (SELECT * FROM timers WHERE timers.user_id = 1) AS tmptimers ON ...
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0answers
19 views

Understanding pg-pool in details

I have following problem regarding the pg-pool (3.3.3) When master fails, automatic failover happens and standby is promoted to master. But this new master don't have any replicators. Other slave ...
1
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1answer
38 views

how to update the value of a period contained inside a bigger range

I have a tsrange like '[2010-01-01 14:00, 2010-01-01 15:00]',20 And want to update the 20 value to 15 in a range inside that, like '[2010-01-01 14:10, 2010-01-01 14:30]',15 My expected outcome ...
3
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1answer
33 views

PostgreSQL: Trigger for updating view doesn't work

I'm trying to make the trigger for updating a view work. If I'm doing and INSERT it works! But when I'm trying to do an UPDATE it just doesn't run. CREATE OR REPLACE FUNCTION test_trigger_function() ...
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1answer
41 views

PostgreSQL: schema diff/patch tool

Consider the following setting: A production DB A dev db, on which schema changes are made to enable new features When the development of a new feature is complete, I have to manually update the ...
0
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1answer
11 views

Does PostgreSQL take time to start streaming replication after restart master?

I set streaming replication in postgresql 9.3. I have one master and 3 slaves and replication works fine. But when i restart the master server and login using postgres database, pg_stat_replication ...
0
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1answer
18 views

Unmount/detach/deactivate PostgreSQL database

I manage a server that serves several web applications that use PostgreSQL as a data store. Each web application has a separate role and database, and each database is stored exclusively on a ...
0
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1answer
20 views

PostgreSQL streaming versus file-based replication (In terms of server behavior & configuration)

I am trying to understand best uses of PostgreSQL replication and how it works so I can troubleshoot in a production environment. I am having a hard time understanding the differences between these 2 ...
1
vote
1answer
21 views

Optimizing bulk update performance in Postgresql with dependencies

Basically my question is the same as this one, but WITH dependencies, so drop/renaming the table is not a trivial option (I assume). We are refactoring a large, poorly designed table which has many ...
1
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1answer
52 views

PosgreSQL: very slow select on a single table with no joins

I'm trying to help a colleague who's having some problems with a PostgreSQL query. We've narrowed it down to a join to one table making the query painfully slow and, upon investigation, we found that ...
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0answers
22 views

Matching array values in PostgreSQL with ActiveRecord

In my Rails 4 app I have a goal to see all contacts, where field visible_to in contacts table equal to 1. My visible_to is :integer, array: true. However, I get the following exception: ...
3
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1answer
24 views

Why does the behavior of array syntax differ from '(?,?)' syntax when updating a point field and that field is NULL?

I'm using PostgreSQL 9.3.5. Suppose I have the following table: CREATE TEMPORARY TABLE point_test ("name" varchar(255), "pt" point); I then insert a row, leaving pt NULL: INSERT INTO point_test ...
0
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1answer
23 views

Connect Jira to Postgresql with Pgpool-II

I gotta problem with connecting Jira 6 to Pgpool-II which is responsible for load balancing and replication in Postgresql bases(2 instances). Pgpool is started on port 9999, I just want to connect ...
1
vote
0answers
25 views

Importing PostgreSQL backup into slightly different database

I have a pg_dump backup which represents a slightly older version of a client dataset. A newer schema is running on the client's production environment, and there is not a readily available tool to ...
0
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1answer
10 views

Migrating a database from one PostgresSQL server to another cleanly

I have a Rails app server that uses Postgres for the db backend. I'm spinning up a new server and I want to get a clean and up to date copy of the database. I've tried it once so far while the ...
0
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0answers
30 views

Bulk update performance

I have a several process that aggregate some statistics on items (how much was shown, clicked ... around 30 factors). Once in a 5 minutes i flush the aggregate data to postgres (9.1). I have 250K ...
1
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1answer
31 views

Paritioning performance for full table scan on non-paritioned index

We have a table in Postgres that we are considering partitioning. We occasionally query an indexed field that is separate from one with the partition key. My question is: Can partitioning the table ...
2
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2answers
148 views

SELECT UNION from two views of the same table

(Sorry the the vague title, if anyone want to re-edit, be my guest!) I have these tables and views for a factory inventory module : +----------------------------+ +--------------------------+ | ...
0
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2answers
26 views

assign selected columns to a variable

Select sum(column_a) as a, sum(column_b) as b round(a / b) From table Group by column In the example above I am summing two column, and I would like to use those 2 results in calculating ...
0
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2answers
46 views

SUM() the result of a stored procedure

I use the Pl/Proxy extension in order to shard a table. It works like a charm, except for this : I have a stored procedure which runs on 4 shards. It looks like this : CREATE OR REPLACE FUNCTION ...
0
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1answer
31 views

How do I list all databases and tables using psql in a pipable format? [duplicate]

This question deals with getting a list. So I get this: $ psql --list List of databases Name | Owner | Encoding | Collate | Ctype | ...
1
vote
1answer
36 views

Does PostgreSQL allow multiple grantees in GRANT commands?

Looking at the PostgreSQL docs it seems that the GRANT command only grants to a single user or role. In fact it doesn't seem to be PostgreSQL alone. Isn't possible to do something like GRANT SELECT ...
1
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0answers
24 views

upgrading from Postgresql 9.1 to 9.3 on Ubuntu using Londiste

I am undertaking a project to upgrade our Postgresql production database from 9.1 to 9.3 using Londiste. The reason I choose Londiste is to avoid substantial downtime from restoring the dump file or ...
0
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1answer
49 views

group by clause without aggregate function

I've always assumed GROUP BY was designed specifically for aggregate functions and in all other circumstances you should use ORDER BY. For example, we have three tables: orders, shippers, and ...
2
votes
1answer
32 views

How to determine if postgres database contains GiST indexes and what type?

Is there a way to easily check if a PostgreSQL database has any GiST indexes and of what type they are?
3
votes
1answer
12 views

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 ...
0
votes
1answer
22 views

Restoring pg_dump hangs

Aim: backup a database and restore it in database2 pg_dump A PG Dump has been created by issuing the following command: c:\Temp>pg_dump -U postgres postgres > backupTest2.sql Opening ...
0
votes
1answer
11 views

ERROR: recursive reference to query “najdi_tot” must not appear within its non-recursive term

I have a trouble with the following CTE query: WITH RECURSIVE najdi_tot(sj) AS ( SELECT nad FROM s_vztah WHERE pod=581 UNION SELECT pod FROM s_vztah WHERE nad=581 UNION SELECT ...
4
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0answers
42 views

How to handle bad query plan caused by exact equality on range type?

I'm performing an update where I require an exact equality on a tstzrange variable. ~1M rows are modified, and the query takes ~13 minutes. The result of EXPLAIN ANALYZE can be seen here, and the ...
1
vote
1answer
38 views

PostgreSQL 9.3: Primary key violated by a trigger INSERT

My problem Consider a table t with many frequent updates from users, from which only the last few are relevant. In order to keep the table size reasonable, whenever a new row is inserted old rows ...
0
votes
1answer
29 views

How can I time SQL-queries using psql from command line?

I am sorry, I cannot comment, so I am posting a new question. There is already a question "How can I time SQL-queries using psql?" but I am missing answer how to do that from command line. How to run ...
1
vote
1answer
17 views

How to apply a newly-created Domain to an existing Column?

In Postgres 9.4 Beta 1, I successfully created a domain of type VARCHAR, fuel_domain_. The domain checks that a value is any of 5 possible strings, coal, gas, wind, hydro, other. CREATE DOMAIN ...
3
votes
2answers
59 views

Pagination with PostgreSQL 9.3: counting number of pages

I'm implementing pagination and sorting of rows in, let's say, products table, using multicolumn index on category, score and id. -- index create index category_score_id on products(category, score, ...
2
votes
0answers
31 views

Is there a way to replicate Postgres databases in Amazon RDS between regions?

We have a Postgres RDS instance in the AWS Oregon Region. For some supposed legal reasons, we have to host our client's European data in the Ireland AWS Region, but we need that data synchronized to ...
1
vote
1answer
31 views

PGBouncer Pause Waits for Remote Connection to Close

I'm testing the pgbouncer "pause" feature to minimize database downtime when a database restart is required. For this test, I have a remote psql session connected to my database through pgbouncer. ...
1
vote
1answer
18 views

Can't list users from heroku psql

I have a heroku postgres add-on database with a user table. However, when I attempt to select * from user, all I get is: current_user ---------------- rtsjlhdfptlaqd (1 row) The table name is ...
1
vote
1answer
32 views

Restrict two specific column values from existing at the same time

I have a PostgreSQL example table where at most one row that is not of type 'c' should be allowed. I would appreciate any help creating a constraint that will enforce this. CREATE TABLE example ( ...
0
votes
1answer
37 views

How do I select the latest rows for all users?

I have a table similar to the following: => \d table Table "public.table" Column | Type | Modifiers ...
1
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1answer
66 views

Efficient way to insert/update/delete table records from complex query in Postgres 9.x

I have this function which returns a set a records and I need to persist those records into a table. I have to do it hundred times a day. My initial approach was just clear data from my table and ...
1
vote
1answer
89 views

PostgreSQL 9.3 - Performance Issue: Counting table entries slower with jdbc postgres driver

I'm using PostgreSQL 9.3 and want to ask if it is possible to improve the performance of my queries based on the following database schema: CREATE TABLE "entities" ( "id" BIGSERIAL, "type" INT ...
1
vote
2answers
65 views

Why can a new user select from any table?

When I create a user in Postgres, create user test with password 'test'; The user ends up being able to connect to every database in the instance. The user can also select from any table: # psql ...
1
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2answers
255 views

Trying to connect to PostgreSQL with Entity Framework via Npgsql and C#

So, I'm new to databases and only have done a little with PostgreSQL before. I have C# (visual studio 2012) and have downloaded the Entity framework (6). I have also downloaded the latest Npgsql data ...