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.

learn more… | top users | synonyms (1)

0
votes
1answer
27 views

Inner join on array column in Postgres

In Postgres 9.4, I'm trying to pull the names of all columns that are involved in a UNIQUE constraint for a given table in Postgres. It looks like the names of such columns are contained in ...
1
vote
0answers
23 views

PostgreSQL DB freezes with large inserts

I am developing a web application with an SQLAlchemy ORM linked with PostgreSQL database backend. I have this usecase where a client uploads a file of about 20 MB containing large data. What I am ...
0
votes
0answers
18 views

What is the best way to analyze free space in a postgres database and the grow of usage?

In Oracle you can in datadictinary analyze free space by using SQL like: select b.tablespace_name, b.file_id, b.file_name, b.bytes/1024 total_KBytes, sum(a.bytes)/(1024) sum_free_Kbytes, ...
1
vote
1answer
23 views

Does index occupy disk memory for rows for which index expression is NULL?

Let's assume that I have following pg_trgm index on mydata JSONB column: CREATE TABLE mytable (mydata JSONB); CREATE INDEX trgm_index_1 ON mytable USING gin ((mydata#>>'{myfield}') ...
1
vote
0answers
13 views

PostgreSQL security threats in external modules or PL languages

In reading the answer to question I came across a paragraph that indicated that some PostgreSQL PL languages and/or contrib modules can be used to compromise the security of the system. Is this only ...
1
vote
1answer
32 views

pg_ctl status responds with “available” during failed startup

I am using pg_ctl -D $PGDATA status to monitor whether my postgres standby database is up and running. Sometimes the database fails to start due to a missing WAL file, but its status is reported as ...
0
votes
2answers
42 views

How to use except but excluding a column from the except clause comparison -psql? [closed]

I want to compare two sets of columns but exclude one column from the comparison as it will never be in the second table and I need it on my result. So, explaining: columns for both tables: ID ...
1
vote
1answer
36 views

Postgres - copy table INCLUDING CONSTRAINT doesn't include constraint

How come that statement don't copy constraints if I explicitly ask for it? CREATE TABLE backup_schema.permissions (LIKE public.permissions INCLUDING DEFAULTS INCLUDING CONSTRAINTS INCLUDING INDEXES ...
1
vote
0answers
16 views

Optimizing a geo search in Postgres

I'm searching for UK postcodes within a radius of a given postcode. The query that I'm using looks like this: SELECT *, earth_distance(ll_to_earth( {$lat}, {$lon} ), ll_to_earth(lat, lng)) as ...
1
vote
1answer
39 views

Can't connect to EC2 Postgresql instance unless I change the default port 5432 [closed]

I just created a brand new EC2 instance with a default security group allowing All Traffic from Anywhere. My listen_address is set to * I can SSH to it but I can't connect to the pgsql instance ...
2
votes
1answer
57 views

Can this UPDATE be faster with indexes?

update line_items set product_id = dups.latest_product_id from line_items as li join products p on li.product_id = p.id join vendors v on p.vendor_id = v.id join vendorgroups vg on ...
0
votes
1answer
41 views

Limit the number of votes

I have a table of content. Users can vote on a content row. They can vote up to three times. I'm looking for the most efficient way to make sure they don't go over three votes. I can think of two ...
1
vote
0answers
21 views

debugging PostgreSQL serialization failures

I am trying to migrate our PostgreSQL 9.4 database from transaction level READ COMMITTED to either REPEATABLE READ or SERIALIZABLE. In either case, I'm exposed to a new set of errors with the format: ...
1
vote
1answer
44 views

PostgreSQL JSON data type used as NOSQL, But VIEW as Relational Data Structure

Could I create a VIEW from the JSON data type but have it as a relational structure? Example: SELECT * FROM json_test; Results [ { "name": "Roy", "Country": "USA", ...
4
votes
1answer
109 views

Combine multiple queries into 1 query

I have a message table in Postgres 9.4 that contains a words field of array type, with random words of a message. Currently I have millions of messages: \d messages Table ...
0
votes
1answer
71 views

How to upgrade postgresql 8.4 to 9.4

I want to upgrade my postgresql 8.4 to 9.4. the documentations are not clear to me. Will I lose my old databases if I do the upgrade? How can I backup my old databases if I am to lose them after ...
3
votes
1answer
56 views

Sharing PostgreSQL database on one dual-boot machine without duplication (cross-platform)

I have PostgreSQL 9.4 installed on a dual-boot machine (both on Win 7 and Ubuntu 14.10). The two systems share a drive (NTFS-formated) which includes a PSQL database directory which was created under ...
1
vote
2answers
36 views

postgreSQL hot_standby pg_dump on slave

I have master-slave (hot_standby) pgsql configuration and I want to make backups from one of my slaves. I don't want PITR, just good old database dump. I switched to postgres from MySQL. With MySQL ...
1
vote
1answer
33 views

RHEL 6: postmaster dead but pid file exists

I am using PostgreSQL 9.2 on RedHat 6 I'm a little confused as to why the following is happening: When postgres is running, performing "service postgresql92-postgresql status" as root results in ...
0
votes
0answers
15 views

Nicely managed lookup tables [migrated]

We have a people table, each person has a gender defined by a gender_id to a genders table, | people | |-----------| | id | | name | | gender_id | | genders | |---------| | id | ...
3
votes
2answers
66 views

Performance hickups after Postgres 9.4 upgrade

After upgrading our database from 9.3.5 to 9.4.1 last night, the server suffers from high CPU spikes. The upgrade was done with pg_dump. So the database was converted to SQL and then imported into ...
0
votes
0answers
16 views

How to display additional column in select with true/false value [SOLVED]

Solved. Look in comment. I am using PostgreSQL 9.1. I have 3 tables: simcards: id serial NOT NULL, iccid character varying(30) NOT NULL, customer_id integer customer: id serial NOT NULL, name ...
0
votes
1answer
47 views

Is anyone else experiencing consistency issues with postgres-xl?

Just like the title says. I have been playing with postgres-xl for over a month and have been seeing strange behaviors. I am using the docker container referenced from the postgres-xl.org site and ...
0
votes
0answers
24 views

rt_raster_to_gdal: Could not load the output GDAL driver

I have already set the environment in windows SET postgis.gdal_enabled_drivers = 'ENABLE_ALL'; Even I tried by adding following in environment path- POSTGIS_GDAL_ENABLED_DRIVERS=ENABLE_ALL ...
2
votes
2answers
24 views

Aggregate all joined rows with where clause

Three nested tables exist: user_groups, users, projects. Each user_group has many users and, in turn, each user has many projects. Each project has an ordinal assigned, 1-5 (step_number). I would ...
0
votes
2answers
42 views

Automatically set value on child rows when deleting parent row?

Description We have a table and data below : Version: PostgreSQL 9.3 Table name: tree_data (id int, code text, name text, parent_id int) Primary key: id Foreign key: parent_id (refer to id) and ...
1
vote
1answer
20 views

Unable to create read only user— postgresql 9.4

I am using PostgreSQL 9.4, I want to make a user with permanent read only access on public schema. I have tried many different ways to get this but using REVOKE ALL on schema public to user1; GRANT ...
0
votes
1answer
27 views

Insert sum of the row data of each record into separate column in postgreSQL?

I have a table id name class social science math Total 2 Max Three 85 56 85 3 Arnold Three 55 40 75 4 Krish Four 60 50 70 ...
0
votes
0answers
19 views

Postgresql Query equivalent to VLookUp of Excel [migrated]

I have two tables such as Table1 and Table2. Table1 contains three columns called name, age and marks where marks column is empty and I need to populate from Table2. Table2 contains two column called ...
0
votes
0answers
28 views

PostgreSQL: raise error if planner needs to do an sequence scan

I want to check if our code does use only indexed columns. I think it does, but I want to be sure. How can I configure/modify PostgreSQL to raise an exception if it needs to do an sequence scan? It ...
0
votes
1answer
29 views

Error in PostgreSQL/PostGIS Access to offline bands disabled

I am using postgis functions i.e. ST_Clip, ST_PixelHeight. But I am getting this error - ERROR: rt_raster_load_offline_data: Access to offline bands disabled Actually, I have loaded my raster ...
1
vote
1answer
20 views

How to cancel query as non-superuser?

I'm a non-superuser on a PostgreSQL 9.1 database, and I've just created a bad trigger function that won't stop. I can see the process, e.g.: thedb=> SELECT * FROM pg_stat_activity WHERE procpid = ...
0
votes
1answer
57 views

Inaccurate count when using multiple count functions in PostgreSQL

PostgreSQL 8.0.2 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.4.2 20041017 (Red Hat 3.4.2-6.fc3), Redshift 1.0.890 I'm relatively new to SQL and am learning a lot of about writing queries as in ...
0
votes
0answers
14 views

Multilingual Article/ Category database design

I wasn't getting any answers over at Programmers and was advised to go over here instead... I wanted to make a design for a multilingual database and after having drawn it up have arrived at 5 ...
1
vote
1answer
17 views

Insertion Rule on a view

I m using postgres 9.3 and i m trying to insert data to the view objectifsBoutique and and PostgreSQL returns following error(« objectifsboutique » relation is not found). I have to mention that the ...
0
votes
0answers
17 views

installing pgagent on centos

I have installed pgagent on centos. Now I am trying to connect it to postgres database. I ran: /usr/bin/pgagent_94 -l 2 host = 127.0.0.1 dbname = postgres user = postgres port = 5432 password=mypass ...
1
vote
1answer
32 views

Call function where argument is a (sub)select statement

My function takes an int4 as argument and returns a table: SELECT * FROM test_function(545421); -- works fine SELECT * FROM test_function(SELECT customerid FROM tableX ...
0
votes
1answer
73 views

The cost of left out join versus a select [closed]

I'm currently working with Ebean for database abstraction. My test database is Postgresql 9.3 I turned on logging for the SQL queries to test some code behavior. So, assume 2 tables, OneToMany ...
1
vote
2answers
40 views

PostgreSQL: result of range difference would not be contiguous

How to substract a smaller subrange from a bigger range? 123456789 567 Result: 1234 89 SQL: select '[1,9]'::int4range - '[5,7]'::int4range; ERROR: result of range difference would not be ...
0
votes
1answer
24 views

How does PostgreSQL decide which query to cancel during deadlock cleanup

I know that PostgreSQL will detect and clear deadlock once it happen by cancelling one of the queries. How does PostgreSQL decide which one to cancel? Is this deterministic or there is some randomness ...
0
votes
0answers
18 views

How can I use PostgreSQL's partial sum tree index (if it even exists)? Do any databases allow for use of such an index?

GiST (Generalized Search Tree) indexing is an advanced system which brings together a wide array of different sorting and searching algorithms including B-tree, B+-tree, R-tree, partial sum trees, ...
1
vote
1answer
50 views

What difference between these 2 SQL styles?

If I have a simple table named: conn_log in my Redshift/Postgresql In the performance of view, what difference between these two commands ? select t1.wifi_name, (t2.sconn*100)::numeric/t1.ttconn ...
0
votes
1answer
61 views

How to remove duplicates and keep the one with the most additional information

I have a postgres table (postgres version 9.3.4) of addresses with duplicate addresses: Column | Type | Modifiers ...
0
votes
0answers
31 views

For Postgres, how would I define a custom function to generate primary keys?

In postgres, primary keys are typically generated using a SEQUENCE. I am hoping to generate a unique random 12 character string for use as a primary key. How would I do this in Postgres?
-3
votes
1answer
20 views

In Postgres, what is the relationship between a SEQUENCE and a SERIAL? [closed]

Postgres has the ability to define SERIAL datatypes and SEQUENCE but they seem to overlap in function. What are the main differences ?
0
votes
1answer
27 views

Migrate MySQL 3.23 Data

I have .FRM, .MYD and .MYI files from a MySQL (version 3.23 I think) database from back in the early 2000's. I managed to get the files into a Windows installation of 3.23 and then dump it, however I ...
0
votes
1answer
27 views

Are file locations stored in PostreSQL catalog?

I am trying to learn a bit of PostgreSQL, and I am currently trying to understand the catalog. I think that if it stores all the metadata of the DB, should it also store things like the file ...
0
votes
0answers
22 views

New Table vs Java Beans to allow user to dynamically change data representation?

I am building a database to store the assessment records of students, along with other relevant information and functionality like reporting on average scores etc. Currently my company uses Excel for ...
0
votes
1answer
42 views

Query across schemas in PostgreSQL [closed]

In PostgreSQL, I have a table which, due to sharding, exists across many schemas. In sub-optimal cases, I need to execute a query on all of these schemas (due to an exception which violates the ...
0
votes
1answer
41 views

Installing PostgreSQL and PostGis on Mac OS X

I downloaded and installed PostgreSQL and PostGis from http://www.kyngchaos.com/software/postgres, I work on OS X 10.10. When I go into the terminal now and type psql it says -bash: psql: command ...