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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15 views

Postgres create an insert return rule

I am failing to create a rule which will return the insert's data. The table is: CREATE TABLE foo(a int, b text); My attempt for the rule is: CREATE RULE return_data AS ON INSERT TO foo DO ...
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1answer
8 views

The number of copies for each table stored in physical storage

I am new to Postgres and the database field. My question is that how many copies of each table are stored in physical storage device (memory, disk and so on)? I assume we need more than one copies for ...
2
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0answers
18 views

How to scale a multi table query with a large number of users in Postgres?

I see this as a compound of two related problems, but I might just be confusing things. I want to be able to do a multi table search, but over a large amount of rows. The number of rows being made ...
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1answer
17 views

Trying to load a file into a database on virtual machine

I have set up a Postgres db on a linux vm and have been having no issues using a GUI to connect to it. However, I am trying to load a large, 32GB, file onto it and so am skeptical of the old way I was ...
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1answer
17 views

dm_exec_query_stats in PostgreSQL

I recently started using PostgreSQL after using SQL Server for a while. Is there something like dm_exec_query_stats? I haven't been able to find anything other than logging every long running query. ...
2
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1answer
18 views

postgres: Database replica with some schemas writable

I have two computers. Computer A is dedicated to collecting data and storing it in its local database. Computer B is for analysis. A is running flat out just with the data collection, so I want to ...
0
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2answers
18 views

no pg_hba.conf entry for host “10.1.1.91”, user “user” database “testing”, SSL off

I've come across different versions of this same issue on stackoverflow and on this forum. I've tried the recommendations posted on these forums but I am still unable to connect to a database. I've ...
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0answers
33 views

I am not able to create/reindex a unique index in a table

I have a table that contains user locations (called public.user_location) and is the following: Column | Type | Modifiers id | ...
0
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2answers
38 views

Calculating average with AVG for a list of numbers

This is probably a newbie question (bear with me) but how can I calculate the average for a list of numbers using SQL and the AVG function? I mean, I can add together numbers in SQL like: SELECT ...
1
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2answers
87 views

What is faster, one big query or many small queries?

I have been working for different companies, and I have noticed that some of them prefer to have views that will join a table with all its "relatives". But then on the application some times, we only ...
2
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1answer
24 views

postgresql 9.3: two instances on same port and two different ip adresses don't work

i'm setting up multiple instances of postgres 9.3 on the same machine (centos 7). I have 2 virtual ip addresses, one instance is bound to first address and second is bound to second one. Same ...
2
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1answer
26 views

Delay Trigger Execution

Let me explain the scenario first before asking the question. I have a database with a set of tables. One table, say Table A, contains username details, and other table, say Table B, contains user ...
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0answers
12 views

pg_basebackup could not get WAL end position from server

I'm trying to pg_basebackup my database. I followed instructions in PG Mauals and set it up properly (check on other server and database), but my backup isn't ending - on end of progress it's ...
0
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1answer
19 views

using string concatenation to reference a table

For a database systems project which tracks entities histories, I stumbled acros the following problem. Assume we have the table "entity" CREATE TABLE entity ( eID SERIAL PRIMARY KEY, eName ...
1
vote
1answer
17 views

How to trigger newlines in log messages?

Is it possible for log messages to span multiple lines? I am expecting: RAISE WARNING 'Line 1\nLine 2'; to result in the following log: Line 1 Line 2 But instead I get: Line 1\nLine 2 Any ...
2
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2answers
42 views

Trying to set up new data_directory on Postgres 9.3

Ubuntu 14.04, recently installed Postgres 9.3. Trying to set up a new data_directory to an attached, larger hard drive (/data), and I changed the postgresql.conf file to reflect that. However, I get ...
0
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1answer
26 views

Choosing a RULE instead of a TRIGGER

I my current database schema, there are hundreds of tables that reference another single table (called transaction_entry), that stores generic information about each row (when it was created, last ...
1
vote
1answer
23 views

Can I use pg_restore to restore data to subset of tables?

I am trying to restore data in to select tables of a database (9.3.5). This is a data refresh from production to test, while maintaining some table data in the test database (like application users ...
0
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1answer
35 views

Returning value of insert

I am using Npgsql and I want to be able to do an insert, and if statement that will do an update and then return a value so when ExecuteScalar is called it reads that value. This was done fine in ...
0
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1answer
26 views

Escaping delimiter in postgresql

I am trying to import data into postgres. Data fields are comma separated, strings may contain commas, in which case those are escaped: Data structure: create table v (a varchar); Data file: bus ...
1
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1answer
22 views

postgresql 9.1 failed insert occupies increasing disk space

I have a postgresql 9.1 installation where the available disk space is very low (20Gb) however there is only one client that inserts data in various tables (typically one entry every few minutes) and ...
2
votes
1answer
18 views

trigger can't access column loop

SSCCE: The following script: $ cat test.sql CREATE TABLE public.foo ( loop INTEGER ); CREATE OR REPLACE FUNCTION public.foo_fun(loop INTEGER) RETURNS BOOLEAN AS $$ SELECT TRUE; $$ LANGUAGE SQL; ...
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1answer
32 views

why is the name `loop` treated differently in PostgreSQL

I issue the following DDL: CREATE TABLE foo ( loopa INTEGER, loop INTEGER ); Then, examining the DDL in the server (using a client-side tool like DbVisualizer - sorry don't know the query to ...
0
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0answers
16 views

produce a view from the output of a with query

I would like to produce a view based on few tables. So far I did this: WITH keyword_group AS( SELECT g.id AS group_id ,array_agg(pk.keyword_id) AS keyword_ids FROM group g ...
1
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1answer
25 views

Writing a view that caches to another table

I have a table market_trades with columns timestamp, market_id, and amount: api_production=# \d market_trades; Table "public.market_trades" Column | ...
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0answers
21 views

Schedule daily snapshot task

I want to create a daily snapshot table based on records from product table. I want to run the following query every day at certain time: INSERT INTO ProductSnapshot SELECT NewSnapshotId(), ...
0
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1answer
28 views

Postgres get rows where a field stopps growing

I have a table which has the following structure id SERIAL PRIMARY KEY, device_id INT REFERENCES(another_table), uptime TIMESTAMP Every device is pinged every N minutes. The application logic and ...
0
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1answer
29 views

PostgreSQL migrate data from one table to another (which inherits the first one)

I have a table "company" and another named "school" ("school" table inherits "company"). Most of the data is community generated and sometimes a cleaning is needed. I would like to be able to ...
0
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1answer
15 views

Postgresql multi-column GIN index [duplicate]

Suppose a postgresql table items like this. (keywords column is of type text[]) name account_id keywords ------------------------------ foo1 1 ['k1', 'k2'] foo2 1 ...
0
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1answer
22 views

Backing entire Postgres database server up with pg_basebackup

I back Postgres DB 9.1 up using following command: pg_basebackup -h 127.0.0.1 -U replicationuser -D /storage/test_backup -Ft -z -P In postgresql.conf I have this set: wal_level = hot_standby ...
0
votes
0answers
31 views

updating previous row with current value

select min(hh.id) AS id, he.name_related as name, hh.date_from as date_from, hh.date_to as date_to, hh.name as reason, sum(hh.number_of_days) as no_of_days, dy.a as remove, ...
0
votes
1answer
6 views

Postgresql warning: type reference X converted to Y (SQL State: 00000 - Error Code: 0)

When I execute: CREATE VIEW foreign_keys AS SELECT tc.table_name, kcu.column_name, ccu.table_name AS foreign_table_name, ccu.column_name AS foreign_column_name FROM ...
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2answers
34 views

Need to group by column while ignoring some text format

I have the following data. Sport -------------- Baseball Football Baseball [a] Football [a] [b] Basketball How can I group this to ignore the data in the brackets?
0
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1answer
13 views

Does PostgreSQL `CLUSTER` command also cluster extended storage?

I'm trying to improve the locality of my data by using the CLUSTER command to periodically cluster records that share the same user_id. My most important data is in extended storage. Will extended ...
1
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1answer
30 views

PostgreSQL db volume at 100%. Can I create a tablespace on another volume so I can vacuum full?

I have run out of space, because I am new to Postgres and I have just not been monitoring it properly. Now I cannot even vacuum the tables: ERROR: could not extend file "base/20851/11787": No space ...
0
votes
4answers
77 views

Temporary schema per connection?

I am trying to migrate my unit tests from H2 to Postgresql. Currently, H2 gives me an in-memory schema such that each connection maps to a unique schema, creates the tables, runs the test, and drops ...
0
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2answers
45 views

Does Postgresql support different transaction isolation per connection?

I just discovered that H2 doesn't support concurrent connections using different transaction isolation levels. Meaning, changing the transaction isolation of one connection affects all other ...
0
votes
1answer
16 views

Is there a benefit to using FOR SHARE in this PostgreSql simple select?

In the following PgSql stored function: CREATE OR REPLACE FUNCTION get_offer_from_id( offer_id bigint) RETURNS json AS $$ DECLARE res "entity_data_result"; r "get_offer_data"; ...
3
votes
2answers
41 views

idiom to treat empty result set as zero

This is obviously a SSCCE. I have an inventory table that holds the number of items (numOfItems) in a warehouse at any given date (inventoryDate). Both are integers to keep things simple: CREATE ...
0
votes
1answer
24 views

FDW, replication and CREATE SERVER - will it work?

We have two servers (master, slave) and we want to use the FDW. The two databases to be connected with the FDW are both on the master (and the slave of course). When we are to CREATE SERVER we would ...
2
votes
1answer
33 views

restoring Postgres database: pg_restore -vs- just using psql

I am dumping my Postgres database using pg_dump (in plain-text format) and then restore it simply by using psql (with the -f option). Which begs the question: am I missing anything by not using ...
0
votes
2answers
69 views

sum of double precision gives weird results

I've been making a sum of a column containing about 500.000 records of double precision numbers. All numbers in the database should normally be of two ciphers behind the period. However when making ...
0
votes
3answers
91 views

get row count of last select query

I am using a scheduled script which exports the (new) rows of the PostgreSQL database into a textfile. There are also several instances of this script running for several DBs: COPY (SELECT ... FROM ...
0
votes
1answer
31 views

Run and Save multiple SELECT statements

Within a Postgres function I would like to run a number of PSQL SELECT commands. For each SELECT command I would like to output written to separate text files. What is the best way to implement ...
0
votes
0answers
32 views

Suppression of statement in Postgresql logging

Given the following SQL function: CREATE OR REPLACE FUNCTION log_a_notice() RETURNS void AS $BODY$ BEGIN RAISE NOTICE 'This message is coming from log_a_notice()'; END; $BODY$ LANGUAGE plpgsql ...
3
votes
1answer
54 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 ...
1
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1answer
29 views

Can a PostgreSQL Trigger be used to ignore an insert?

I've got a situation where there are dozens of various triggers in our database that trigger a record being inserted into another (single) table within the database. I was hoping that while testing ...
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votes
1answer
19 views

Permission denied when importing a database

This is my first time here and i have a question. I am working with postgresql on windows 8 for the first time. I am trying to import a database into postgresql with the command line. Type in: psql ...
0
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1answer
16 views

Using PostgreSQL both with (not only) SQL Workbench - how to apply alternate delimiters

I have created a PostgreSQL database. Now I try to work with it in SQL Workbench, but I have a problem with the way it understands statement delimiters. The documentation on alternate delimiters sais ...
0
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1answer
30 views

Why use RDS over EC2 for Postgres?

I have a database currently running on EC2. As I have to move it to a bigger machine the question of using RDS came up. Pricing: I can get an EC2 c3.large instance with two SSDs (16GB each), two ...