Import binary database file into postgres
I have a quite newbie question that I do not know if is possible or not: I had to format my computer, and the only way to keep my postgres database was accessing to data with my folder browser...
View ArticleIndex on integer column not helping. Help? (EXPLAIN ANALYZE output inside)
The table market_trades has an integer column market_id which takes values from 1 to 5. This seems like a pretty straightforward query to get the number of trades on each market: WITH markets AS (...
View Articlepostgresql cannot drop a table when autovacuum holds lock on it
Autovacuuming process holds RowExclusiveLock and ShareUpdateExclusiveLock on the table, which I want to drop. I read that autovacuum should be canceled automatically, when submitting DROP TABLE...
View ArticleGoogle Streetview Images in infowindow
I have followed the instructions on this blog post on adding streetview images to the infowindow: http://blog.cartodb.com/a-picture-is-worth-1-000-attributes-infowindows-with/ I can do it without a...
View ArticleHow to get pg_archivecleanup on Amazon Linux 2014.03?
I have an Amazon EC2 instance based on Amazon Linux AMI 2014.03. I installed PostresSQL from their repos: yum install postgresql-libs postgresql postgresql-server postgresql-devel I’ve read about...
View ArticleClik here to view.
Connecting to ArcGIS Desktop PostgreSQL database (running locally)
I know this is a total noob question but then again, when it comes to PostgreSQL I am a total noob… I have installed the OpenGeo suite on my computer, running Windows 7, 64-bit. I have downloaded the...
View ArticleIs 'internallength' always useful in custom type definition in Postgres?
In our database we use a custom type to store 3D locations: CREATE TYPE float3d AS ( x real, y real, z real); In many examples I see INTERNALLENGTH used as a parameter with the definition of custom...
View ArticleFind all values not present for other values of other column
Let’s suppose I have a table with integer columns a and b (each pair (a,b) is unique) and following data: a | b ------- 1 | 2 1 | 3 1 | 4 1 | 5 2 | 1 2 | 3 2 | 4 3 | 1 3 | 3 Now I need to get all the...
View ArticleExplain PostgreSql ssl_cipher values: ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH
In the postgresql.conf file, one can configure authorized values for ssl_cipher. Yet I could not find documentation explaining what the ALL, ADH, LOW, EXP, MD5 and STRENGTH values correspond to. MD5...
View ArticleWhy 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 -h...
View ArticleUnderstanding postgres prompts
What is the difference between postgres=# and postgres-#? I tried googling it and looking on the official site but could not get a hit for the symbols.
View ArticleStoring generated documents that can not be updated by changes in relationships
I have a system running with PostgreSQL and Yii Framework, which generates a few medical documents that, once ready, can’t be changed. For example: If my full name comes out on this document today, and...
View ArticleRemoving all columns with given name
I am converting a MSSQL schema to PostgreSQL and in that schema most tables have a column called Timestamp that are of MSSQL timestamp datatype which is effectively rowversion. When inserting records...
View ArticleSelecting aggregated string from database
I have a table in my database consisting of one column which is NewLanguage(varchar). I insert new languages to the table and I want to select the rows of the table and assign them to a string variable...
View ArticleFast hamming distance queries in postgres
I have a large database (16M rows) containing perceptual hashes of images. I’d like to be able to search for rows by hamming distance in a reasonable timeframe. Currently, as far as I properly...
View ArticleUnderstanding 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...
View ArticleWhere is psql connecting?
TL;DR: It was a network issue. Read the updates at the bottom for what I found. Typing psql, I can connect: $ psql psql (9.3.2) Type "help" for help. ben=# Typing psql -h localhost, I can’t connection:...
View Articlegroup 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...
View ArticleClik here to view.
How do I maintain high INSERT-performance on PostgreSQL
I’m working on a project which is parsing data from measurement files into a Posgres 9.3.5 database. At the core is a table (partitioned by month) which contains a row for each measurement point:...
View ArticleStoring DB credentials in an application source code?
I am making an app which connects to a DB, and the app will have plenty different userslogins. Is it a good design choice to have a specific DB login/password for the application, using which the...
View Article