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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no pg_hba.conf entry for replication connection from host

(Also posted to pgsql-general) I have been configuring a slave server that needs to connect to the host. Both the master and the standby servers have a pg_hba.conf that looks like this: # Allow ...
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0answers
26 views

How do I know Postgres streaming replication is working?

I have set up a standby server to follow a primary Postgres server following [this wiki page][1]. The issue is that I am not sure the primary server is sending anything to the replica because I don't ...
0
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1answer
33 views

pg_basebackup fails with “ too many connections for role ”replication“”

I am trying to set up a standby server and keep getting this error. My primary server has more than enough connections to handle the load: listen_addresses = '*' wal_level = hot_standby ...
0
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1answer
77 views

pg_basebackup: could not connect to server: fe_sendauth: no password supplied

I'm trying to set up streaming replication between two Postgres servers. The master server's pg_hba.conf file is configured this way: host replication ${REP_USER} 0.0.0.0/0 ...
3
votes
1answer
91 views

'ERROR: text search dictionary “unaccent” does not exist' during CREATE INDEX?

I'm running PostgreSQL 9.3 on Mac OS X Yosemite. I try to create an unaccent lowercase trigram index. To achieve it I did this: mydb=# CREATE EXTENSION pg_trgm SCHEMA public VERSION "1.1"; ...
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1answer
21 views

Get currentmilliseconds in postgres

I'm working on timestamp/datetime in my application. I'm using postgres db. What is the way to get current milliseconds (something like 1412706599000) in postgres?
2
votes
1answer
152 views

Postgres 9.4.1 on Ubuntu 14.04.2 LTS fails to install properly

I'm trying to install PostgreSQL 9.4.1 on Ubuntu 14.04.2. I'm using the packages from apt.postgresql.org. The package installs but it fails running pg_createcluster. If I run manually, I get: ...
3
votes
1answer
51 views

How to correctly use PostgreSQL to limit multiple and/or concurrent executions of a task

Let's assume you have a task FOO that can be queued once every minute, and a pool of 50 workers that can be paused. The queue is paused for 10 minutes, and 10 FOO tasks are queued. When the queue is ...
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0answers
39 views

Replication Lag on Postgres AWS RDS Service

We have a single master/single streaming replica Postgres 9.3 db on AWS. The load is not terribly high - this is a development/staging environment. (The production shows similar metrics). Point is the ...
1
vote
2answers
73 views

How to select data in the same table on different rows that are empty?

I use this select on my SQLite database: SELECT attributeX FROM table GROUP BY attributeX HAVING COUNT(attributeY) = 0; My table: attributeX (type integer) | attributeY (type text) ...
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votes
1answer
56 views

Replace SQL Server with another DBMS [closed]

In our current application (C#, ASP.NET) we are using SQL Server database. My superiors are planning to move from SQL Server to another database considering the amount of investment involved with ever ...
0
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1answer
58 views

set session - custom variable to store user id

I want to store user id in custom session variable and use it (read) in trigger procedures to authorize user actions. I found something like this: set session "myapp.user" = '12345'; ... SELECT ...
4
votes
3answers
96 views

Scalable query for running counts of events within x previous days

I already posted this question on stackoverflow but I thought that I might get a better answer here. I have a table storing millions of events occurring to users: ...
1
vote
1answer
70 views

SQL query to sum a column prior to date and show all entries after that date

I have a database function that sum a column prior to a date and after that date show all entries one by one. that function return the data ordered by a common field and apply the sum by date every ...
2
votes
2answers
101 views

Check if contiguous date interval exists

I have a table in PostgreSQL which describes some events that have a start date and an end date: CREATE TABLE my_table ( event_id serial NOT NULL, start_date timestamp without time zone NOT ...
1
vote
1answer
26 views

purchasing item by client - how to ensure that user has enough funds?

I have to tables: users (id serial, coins integer not null default 0) purchases (id serial, price integer not null, user_id) When new row is inserted into purchases table I want to subtract amount ...
0
votes
1answer
78 views

How to temporarily disable foreign keys in Amazon RDS PostgreSQL?

I'm migrating existing test environment to Amazon RDS PostgreSQL. The test framework has a feature of reloading data in certain tables to an earlier state. For this it disables foreign keys, deletes ...
1
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1answer
34 views

How to create INOUT assignment cast on Amazon RDS PostgreSQL? If not possible, then why?

I'm migrating existing application to Amazon RDS PostgreSQL. The application has cross-database support and for compatibility reasons it includes the following SQL: CREATE CAST (varchar AS numeric) ...
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1answer
100 views

Postgresql 9.4.1 stuck all queries when making multi updates

Before i used 9.3.5 and servers with ubuntu 12 with 32GB memory. After upgrade to 9.4.1, with more power server 60GB memory on each in wall replication and ubuntu 14, started get db stucks when run ...
1
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1answer
24 views

Upgraded Postgres; how to access now-missing databases?

My local connection on my Mac (10.9.5) wasn't working to my Postgres (9.3) database (and therefore I couldn't actually export the data), so I tried upgrading it to 9.4. Luckily I can now connect to ...
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1answer
23 views

PsQl data dump import [closed]

Psql databasename < file.db is the recommended method to import to a database. This doesn't work why?
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2answers
50 views

Slow Select over View

My simple SELECT statement on a view in Postgres 9.3.1 is pretty slow. The receipts table has 20 million entries and the other one has around 17k. But I still think it should be faster than ~16 ...
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0answers
67 views

Slow query over 10mil rows with group by on indexed column

I've got a slow query which I want to optimize. SELECT pand.bouwjaar AS construction_date, count(*) FROM pand AS pand WHERE pand.begindatumtijdvakgeldigheid <= 'now'::text::timestamp ...
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0answers
25 views

Postgres count of delimited items in bytea encoded string

How would you get a count for each of $ delimited Individuals in each of the group_names? (Example: SomeGroup has 1, This Is Another Group has 8) thedb=# select group_name,encode(group_data,'escape') ...
1
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1answer
50 views

PostgreSQL on RDS: How to bulk import data with FK constraints?

Is there an efficient way to bulk import data into a PostgreSQL 9.4 database on RDS that makes extensive use of foreign key constraints? The standard method of using pg_restore fails because RDS does ...
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0answers
43 views

Online Recovery for pgPool-II “cannot find xlog functions”

I am trying to set up Online Recovery for pgPool-II [Replication,Load Balancing, Connection Pooling] modes enabled. I followed the sample provided on the pgPool-II website for the PITR recovery ...
3
votes
2answers
183 views

How to get exception context for a manually raised exception in PL/pgSQL?

In Postgres, we get the "stack trace" of exceptions using this code: EXCEPTION WHEN others THEN GET STACKED DIAGNOSTICS v_error_stack = PG_EXCEPTION_CONTEXT; This works fine for "natural" ...
2
votes
1answer
23 views

pg_restore a view

What's the best way to restore a view? pg_dump -h hostname -d databasename -Fc > db.dump DROP VIEW viewname; pg_restore -h hostname -d databasename -t viewname db.dump This does not error, but ...
1
vote
1answer
80 views

Best way to drop / recreate a table that has dependent views?

Problem PostgreSQL does not have logical column reordering, at least not in 9.2 If columns need to be added in the middle of a large table and order is important, the best way is to drop and ...
4
votes
1answer
167 views

Restoring plain-text pg_dump with psql and --disable-triggers

I had to perform some tests with a short script to update some "legacy" data in one of my tables. Cautious as I am, using an untested script, I decided to backup the relevant table before doing so. ...
1
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1answer
100 views

postgresql bdr 0.8.x - adding another downstream server only partially works

I have the following postgresql 9.4 bdr setup: upstream server with db called "bdrdemo" running on 10.1.1.1 downstream server(1) with db called bdrdemo running on 10.2.2.2 (replicates with ...
2
votes
2answers
69 views

Sampling in PostgreSQL

I am looking for possible ways of random sampling in PostgreSQL. I found a couple of methods to do that with different advantages and disadvantages. The naive way to do that is: select * from ...
0
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1answer
60 views

SQL update multiple columns matching a pattern

I have a table in a postgresql database in which I have multiple columns matching a pattern /\w*(?:_open|_close)/g. Those are timefields. I would like to substract 1 hour from all the rows on those ...
0
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1answer
48 views

What will be best (for performance) transaction isolation level?

There, are two types of queries that are executed in my app: DELETE FROM tbl1 WHERE user_id = 1; INSERT INTO tbl1 VALUES (...), (...), ...; and UPDATE tbl2 WHERE id = 1 SET ...; DELETE FROM tbl3 ...
3
votes
2answers
160 views

Have: Postgres database files. Need: Functioning database

I am running Ubuntu 14.04 with a postgres/postgis setup and in a weak moment removed PostgreSQL 9.1 (seemingly a legacy install from 12.04 from before I upgraded to 14.04), having erroneously ...
1
vote
1answer
44 views

Reference column alias in same SELECT list

I'm converting an old MS-Access-based system to PostgreSQL. In Access, fields that were made up in SELECTs could be used as parts of equations for later fields, like this: SELECT samples.id, ...
0
votes
2answers
86 views

Query that was working on MySQL is not working on PostgreSQL

I had the following query (with bin_number being a string) which was working on MySQL 5.5: Postgres - was working on MySQL and doesn't work on PostgreSQL SELECT "menu_items".* FROM "menu_items" ...
1
vote
1answer
63 views

VACUUM FULL fails with 'ERROR: Check free disk space'

I am using Postgres 9.4. I have a database that \l+ tells me is 164 GB. When I try to run VACUUM FULL on the database, I get this error (after many hours): ERROR: could not extend file ...
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votes
1answer
26 views

Prioritised table query

I'm looking for a way to query two tables at once but ... I want the query to first run against Table A and then if Table A returns no matching records to query Table B. There many well be instances ...
2
votes
1answer
42 views

Postgres: check disk space taken by materialized view?

I know how to check the size of indexes and tables in Postgres (I'm using version 9.4): SELECT relname AS objectname, relkind AS objecttype, reltuples AS "#entries", ...
0
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1answer
34 views

How can I drop and create postgresql views in dependency order?

I found the following http://stackoverflow.com/a/9712051/61249 which is good but still too much manual labor for me. I need to recreate the views in the right order how would I go about doing that? ...
1
vote
1answer
23 views

Search results mismatch after postgresql update

Today we had to update the PostgreSQL version on our database servers. Before update the version was 9.3.4 and the new one is 9.3.6. Despite the small difference in the database version and the ...
0
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1answer
24 views

Can I setup database triggers to run on a defined secondary set of servers only? [closed]

This might sound a bit off, but here's what I have been thinking for a while now: Use Case You want to build an activity log for each user action on your application using database (postgreSQL) ...
3
votes
1answer
220 views

Can't get Dell PE T420 (Perc H710) perform better than a MacMini with PostgreSQL

It's months that I'm trying to solve a performance issue with PostgreSQL. SYSTEM CONFIGURATION Our deployment machine is a Dell PowerEdge T420 with a Perc H710 RAID controller configured in this ...
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0answers
7 views

Error on slave2 after promoting slave1 to master in cascaded streaming replication

I've a setup like MASTER -> SLAVE1 -> SLAVE2. MASTER and SLAVE2 are running on different ports on single server. SLAVE1 in on another server. For testing purpose I've powered off my first server ...
0
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1answer
22 views

Migrating from 32 bit using pg_basebackup

Has anyone migrated a 32 bit postgres 9.2 database to a 64 bit postgres 9.2? I'm trying to use pg_basebackup but I'm not sure whether this is the right approach.
0
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1answer
49 views

PostgreSQL pg_upgrade --link mode performance issue after upgrade

Trying to do PostgreSQL Upgrade from 9.0 to 9.3 latest version. Using pg_uprade --link mode, since the downtime is very minimal compare to other options like pg_dumpall and pg_upgrade with normal ...
3
votes
1answer
47 views

Migration From Oracle to PostgreSQL Encoding Errors

I'm working on migrating data from an oracle database to a postgresql database. I running into a problem where I export the data from oracle, using sql developer, and importing it into postgresql. ...
1
vote
1answer
55 views

Creating a database under a different owner

I'm trying to set up a role in Postgres which can a) Create a new Role b) Create a new Database c) Make that new Role the owner of the database d) Have no other rights (as far as is possible!) I have ...
2
votes
0answers
63 views

Unique Index much bigger than the table itself

Pg 9.3 on debian 7. I have a very huge table in rows, about 178 million (will turn 250 million in a week and then grow 500 thousand a day), but not that huge in size, wich is 20GB, it's a small ...