All versions of PostgreSQL. Add a version-specific tag like postgresql-9.4 if that context is important.

learn more… | top users | synonyms (1)

2
votes
1answer
141 views

Postgresql: How do full_page_writes help prevent data loss?

From the postgresql docs [full page writes are] needed because a page write that is in process during an operating system crash might be only partially completed, leading to an on-disk page that ...
0
votes
0answers
153 views

How to deal with finding nearby locations when given a zip code or city?

I am using PostgreSQL and PostGIS for this. I have downloaded dumps from Geoname, and built my tables from allCountries, alternateNames, and countryInfo. I've created my PostGIS geometry column, and ...
0
votes
0answers
57 views

SQL JOIN excluding duplicate

I'm using PostgreSQL under ubuntu 14.04. I have two tables as below: create table material_base_name ( id bigserial, base_name varchar(50), constraint pk_materials_base_name primary key (id) ); ...
1
vote
1answer
47 views

joins with “could be blank” conditions

Question is most probably stupid but I am stuck on this and cant think anymore(Pissed Off). I have these tables-> employee(has a column foreign to location),location and location_flag. And I need ...
7
votes
1answer
2k views

Why is CTE open to lost updates?

I don't understand what Craig Ringer meant when he commented: This solution is subject to lost updates if the inserting transaction rolls back; there's no check to enforce that the UPDATE affected ...
0
votes
0answers
165 views

postgres: access to schema objects within a function

Here's my problem: I have Schema A, owned by User 1, that owns all objects. I've created schema B, owned by User 2. I have granted User 2 all privileges to the objects owned by User 1. When logged ...
1
vote
1answer
274 views

Removing a Key From HSTORE in Postgresql

At the moment I have an hstore that describes the properties of various items. When searching I need to remove values that are unique to a each item (such as serial number, vin, and so on). According ...
1
vote
1answer
412 views

When is Postgres autovacuum executed

I am using an older version of Postgres (8.4.20). I know that the autovacuum process is executed frequently to free disk space of queries that deleted or updated data in tables. I have a database ...
1
vote
3answers
139 views

Longest matching suffix while using aggregate functions

Background Looking to find the longest matching string suffix. Setup Consider the following fiddle: CREATE TABLE noun ("label" varchar(10)) ; INSERT INTO noun ("label") VALUES ('bar'),...
2
votes
2answers
151 views

Tables names in a supertype/subtype schema [closed]

I have 3 types of users in my app. The users share some common attributes, but they also have quite a bit of stuff that pertains uniquely to each user type. I have a person table that contains limited ...
1
vote
2answers
584 views

SET ROLE via parameterized query

In the very helpful response I received to a previous question, I am trying to write some JDBC code that first sets the role to a specific user before executing subsequent queries. On the safe side I ...
1
vote
1answer
234 views

Upgrading 8.1 to 9.3 - using statement log and WAL to check compatibility?

We're migrating from postgres 8.1 to 9.3, since we need streaming replication badly. All the application developers have deserted the company a long time ago, way before my time here, so there is ...
0
votes
1answer
56 views

Check for blocked queries periodically and cancel them

I have series of update queries which are executed every 5-10 seconds. Sometimes it happens that one of these will block all the pending update queries as for some reason it just freezes. Since I can ...
1
vote
1answer
756 views

pgpool-II doesn't execute my failover script

I have been installed pgpool-II 3.3.4 from source. I have two pgpool nodes and I also used the watchdog configuration to get a pgpool services with High Availability. When I stop one, the other wake ...
1
vote
2answers
482 views

PostgreSQL : dependencies on a schema

I need to delete a schema in my PostgreSQL database. I would like to make sure that the schema is not used in another schema (for instance : this schema is used for a view in another one). Is there a ...
3
votes
1answer
300 views

Unsupported languages in Postgres Full text search

My web application supports 3 languages, English, Traditional Chinese, Vietnamese. I understand that Traditional Chinese and Vietnamese is not supported in Postgres' Full Text Search. If I were to go ...
0
votes
2answers
206 views

pg_stat_activity entries with no corresponding process on the client

If I see an entry in pg_stat_activity for a client_addr:client_port combination where there is no process bound to that port on the indicated client, what does that mean? Just that the client process ...
0
votes
2answers
1k views

Postgresql. Generate sets of random integers

With this command I can generate 16384 random integers between 1 AND 200,000. SELECT generate_series (1,16384),(random()*200000)::int AS id I want to generate 10 sets of such integers. Each set ...
3
votes
1answer
846 views

PostgreSQL Common Table Expressions vs a temporary table?

The PostgreSQL documentation on WITH shows the following example: WITH regional_sales AS ( SELECT region, SUM(amount) AS total_sales FROM orders GROUP BY region ), ...
9
votes
2answers
6k views

PostgreSQL maximize performance SSD

I will have a huge PostgreSQL 9.3 database with many tables with more than 100M entries per table. This database will be basically be read-only (once I fill all the necessary tables and build the ...
0
votes
2answers
1k views

Postgres: error message “does not exist” when dropping existing trigger

I have a trigger associated to a table. When i drop it via DROP TRIGGER IF EXISTS myTrigger on dummytable; postgres tells me NOTICE: trigger "mytrigger" for table "dummytable" does not ...
2
votes
3answers
287 views

Can I perform a MAX over a pair of columns?

I would like to execute the following: SELECT person, MAX( (date, priority) ) FROM table GROUP BY person; It would return a person, date and priority row for each distinct value in the person ...
6
votes
3answers
3k views

Slow queries on billions-rows-table // index used

Since I'm a young developer and not really skilled in using databases (PostgreSQL 9.3) I ran into some problems with a project, where I really need help with. My project is about collecting data of ...
4
votes
1answer
174 views

PL/pgSQL - Indexes vs Collation vs Pattern Ops

I'm using PostgreSQL 9.3. Having already read articles and answers on DBA stackexchange: Why would you index text pattern ops on a text column PostgreSQL documentation: Indexes - Opclass Pattern ...
4
votes
1answer
63 views

Checking for multiple identical values in a Posgresql array

I have a simple table in Postgresql: CREATE TABLE data (id integer, values integer[]); INSERT INTO data VALUES (1, '{1,2,3,4,5}'); INSERT INTO data VALUES (2, '{1,1,2,3,4,5}'); INSERT INTO data ...
1
vote
1answer
749 views

Problem with LISTEN - NOTIFY mechanism in PostgreSQL

I'm struggling with PostgreSQL LISTEN - NOTIFY mechanism. I open two consoles and connect to my database using psql client: psql -U postgres test_db In the first console I subscribe to some ...
3
votes
1answer
550 views

PostgreSQL server problem in Windows XP

2014-10-01 09:22:49 IST LOG: database system was interrupted; last known up at 2014-09-30 18:30:24 IST 2014-10-01 09:22:49 IST FATAL: the database system is starting up 2014-10-01 09:22:49 IST LOG: ...
1
vote
0answers
149 views

Select all foreign key relationship chains from any set of potentially gapped table names

I am using this query to find all foreign key relationships: SELECT con.relname AS child_table, att2.attname AS child_column, cl.relname AS parent_table, att.attname AS parent_column ...
0
votes
1answer
31 views

Getting information on users payments via subscriptions

My current table db design looks like this : - User has one subscription - One subscription has many payments Table subscription has a user_id, which is FK to user table. Table payment has a ...
3
votes
2answers
298 views

How to save an interval of years in postgresql

I have to save an interval of years, like: id intervalYears 1 2014/2015 2 2015/2016 3 2016/2017 And so on. Those years are like accademic years, so the first year must be lesser then the second, ...
1
vote
1answer
967 views

use variable to determine the name of a column in the select in postgre

I'm trying create a update for a new structure of tables from a old table, but not using functions. I'm trying create a script to it. The old table is like this: -- old table (OldTable) name| col_a | ...
1
vote
2answers
544 views

Importing CSV into multiple tables using PostgreSQL

I have a very big CSV file with the following format: TAG,TIME,VALUE as an example row: footag,2014-06-25 08:00:00.0,3400.0 I used to import it easily inside PostgreSQL 9.3 using the following: ...
1
vote
1answer
46 views

List distinct column values where those rows share other column values

I'm trying to write a query to detect possibly-invalid data in a PostgreSQL table. We have a table of city names like this: # `city_names` id | name | language | dialect | city_id -----------...
1
vote
2answers
379 views

PostgreSQL - summing arrays by index

I have an array of doubles column (double precision[]) in PostgreSQL that keeps half hour values for a day. So each array holds 48 values. I need an efficient query that is summing all this array ...
1
vote
2answers
2k views

How to restore postgreSQL schema dump to schema with different name

I know I can alter schema name after restoring but the problem is the name might already exist and I don't want to touch that existing schema. The dump type is "custom". So effectively I want ...
1
vote
1answer
109 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 ...
4
votes
1answer
4k views

PostgreSQL complaining about shared memory, but shared memory seems to be OK

I've been performing kind of intensive schema dropping and creating over a PostgreSQL server, but now complains..: WARNING: out of shared memory ERROR: out of shared memory HINT: You might need to ...
1
vote
1answer
145 views

Connection pooling with 3 databases but 1 database as master for repmgr replication?

I'm using pgbouncer for connection pooling against 3 database on different servers, now I'm planning to use repmgr for replication, my question is, can I keep doing connection pooling on these 3 ...
4
votes
1answer
235 views

PostgreSQL performance worse when adding CPUs

I ran into a strange behaviour when benchmarking PostgreSQL. The setup is like this: Virtual box VM, with 3 GB of RAM. The host has 16GB of RAM and 4 CPUs. Ubuntu 14.04, standard PostgreSQL 9.3 ...
0
votes
0answers
29 views

Postgresql: Domain of two values

I have to create a custom domain that is an interval between two years, but i actually need both years. For example: '2013/2014' '2015/2016' Is there a way to pack both years inside a single domain,...
1
vote
1answer
864 views

How to connect to an Amazon PostgreSQL database using SSL

I'm trying to log into an Amazon PostgreSQL DBS using SSL. I have all credentials but my psql version doesn't seem to support SSL. I've tried searching Postgres docs but all I see is how it has ...
1
vote
1answer
72 views

How much should I care about prepared statements for simple queries?

I wonder how much I should care about prepared statements (and therefore try to optimize my code) in case of pretty simple statements. The question originates from the fact that I recently noticed ...
1
vote
1answer
476 views

Format timezone to +-#### instead of +-##

I am curious if there is a way to configure Postgres (9.1+) to format the TZ part of a "timestamp with time zone" as +-####, just like PHP's date.format method does using "O". PHP Docs: O | ...
0
votes
1answer
47 views

Revoke delete from table for database owner

I am trying to revoke the DELETE privilege on a table for a database owner. I execute the command: REVOKE DELETE on my_table FROM database_owner; But when querying this via SELECT ...
1
vote
1answer
242 views

Replicating a postgres database for testing

I want to replicate a live server postgres database to our dev server for testing purposes but the problem is in inbuilt postgres replication feature the slave is always read only. Is there any better ...
0
votes
0answers
195 views

pgAgent does not run

I referred this to set up a scheduled job and did everything as it mentioned(ran the pgagent.sql as well) I need a very simple task to run periodically. In the 'Definition' tab in the steps, few ...
3
votes
1answer
560 views

Proxy authentication for PostgeSQL

The following seems likely to be a fairly common situation, but I haven't seen any solutions. I have a PostgreSQL database containing views that are specific to the $user, in order to restrict data ...
0
votes
1answer
233 views

How the xlogs files travels form Master to Slave

I have some doubts about how the workflow proccess in PostgreSQL replication using archiving logs. If I have this configuration in Master postgresql.conf: archive_command = 'test ! -f /path/to/...
0
votes
2answers
248 views

for archive_command use an script rather than a command

I want to create a configuration to get a PostgreSQL HA. In my Master I want to configure a postgresql.conf file with this: archive_command = 'local_backup_script.sh "%p" "%f"' instead of: ...
1
vote
0answers
42 views

Does pg-pool-II support two phase commit?

When pg-pool II is used with sharding, what happens if I want to do a transaction which involves two nodes ? Does pgpool support two phase commit ?