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4
votes
1answer
3k 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 ...
3
votes
2answers
516 views

Slow fulltext search due to wildly innacurate row estimates

Fulltext queries against this database (storing RT tickets) seem to be taking a very long time to execute. The attachments table (containing the fulltext data) is about 15GB. The database schema is ...
3
votes
1answer
2k views

Permission for sequence in another schema

Postgres 9.3 Debian 7.0 I created a specific schema for a specific user and created a view in this schema for this user, so it's the only table he knows that exists. The problem is that this same ...
2
votes
2answers
186 views

Does the system process slow down my Database access?

I have a Fairly large DB containing mostly html documents. I wrote a python script that fetches always 1000 html documents at once from my database cur.execute("SELECT id,url,html_file FROM html ORDER ...
3
votes
4answers
767 views

postgres: index to SELECT strings like '%foo%';

I have an expensive, periodic PostgreSQL 9.3 query of the form: SELECT * from mytable where name NOT LIKE '%foo%'; foo is actually a constant here that never changes. The query is expensive ...
0
votes
1answer
32 views

Solutions to migrate databases

I'm working in redesign an application. This application has a MySQL database and has approximately 50 tables (there are no relations , there are not standars, etc). We want to migrate to Postgresql ...
1
vote
1answer
418 views

Delete rows while updating references

Suppose I have a person table with an id and some other columns. Other tables reference the person table using ON UPDATE CASCADE. for instance: CREATE TABLE person (id int PRIMARY KEY); CREATE TABLE ...
5
votes
1answer
10k views

Optimizing large database query (25+ million rows, using max() and GROUP BY)

I'm using Postgres 9.3.5 and I have a large table in the database, currently it has over 25 million rows and it tends to get even larger rapidly. I'm trying to select specific rows (all unit_ids with ...
2
votes
1answer
953 views

Handling user logins while using a multiple schema design to support multi-tenancy

I'm creating a web application (in PHP and PostreSQL) that will be used by organisations and their staff and I want to use multiple schemas to support multi-tenancy. There will be one database and I ...
0
votes
2answers
2k views

Delete returns nothing in Psycopg2?

I have a fairly simple delete query in a PostgreSQL database that I'm interfacing with via psycopg2. Take the following minimal example: def testDelete(): db = DbInterface() cur = ...
0
votes
0answers
37 views

Cascading pgbouncer setup?

I am wondering if anyone has tried a cascading pgbouncer setup, where pgbouncer A connects to pgbouncer B and that in turn connects to postgres. From 1Km away this seems a possible setup, but I am ...
3
votes
2answers
673 views

Postgresql - Do Foreign Key Constraints Automatically Create Indexes?

Per the PGSQL 9.3 docs: Because this is not always needed, and there are many choices available on how to index, declaration of a foreign key constraint does not automatically create an index on ...
1
vote
3answers
62 views

How do I keep a database physically secure? [closed]

This is more of a conceptual question. I am learning how to integrate Java and databases (using PostgreSQL at the moment) and my initial questions is: What are the guarantees that the data I ...
2
votes
2answers
579 views

SQL order by query results in any arbitrary (but reproducible) manner

For testing purposes I need to get some data from a set of database tables in any arbitrary (but reproducible) order. The idea being that I can later compare two runs using a textual diff tool. Is ...
0
votes
1answer
365 views

repmgr: Can I replicate databases from two different masters to a third slave?

If I have a master node 1 (with database A) and a master node 2 (with database B) can I use repmgr and have both A and B replicated to a hot standby node 3 ? [ EDIT: They would all be running ...
2
votes
0answers
149 views

Can you force pgpool to require SSL connections?

Can you force pgpool to drop non-ssl connections? I know you can with postgresql (Force PostgreSQL clients to use SSL?), but dropping that same syntax (hostssl instead of host) results in a ...
0
votes
1answer
41 views

accessing fields of returned record object

I need to use a function which exists on another database and was able to figure out how to access it via dblink. The function returns the name of an encryption algorithm and the key used for it, as ...
1
vote
1answer
36 views

Handling exceptions from inside a function

I need to add a trigger after insert or update on a table so that, where some row is updated and a certain condition is met, then some other table needs to be updated. However, that last update ...
1
vote
0answers
676 views

Debugging Postgres 9.3 Triggers

Right now I have a trigger in my database that is giving me some issues. I've set up this line so I can check what is being fetched from a query RAISE NOTICE 'hstore_key = %',hstore_key; as well I ...
3
votes
0answers
456 views

Ways to process XML into a relational structure in Postgres

I have a database that is comprised of ~10 tables, most of which have many-to-many relationships with each other (and an associated join table). I am inserting of the order 100k XML files into a raw ...
2
votes
1answer
500 views

Most efficient way to do many UPDATES in Postgresql

I have to update cca 2.5 milion rows in a table with cca 20 milion rows. The updated column value is based on value of another column, but another select is required to determine it's value. The ...
2
votes
1answer
2k views

PostgreSQL Division In Query Not Working

So I am having a really off day or something, but for the life of me I can not figure this out. I am trying to divide tier1 by total to get a percentage of the total. I thought like this: (tier1 / ...
9
votes
2answers
12k views

Disable all constraints and table checks while restoring a dump

I've obtained a dump of my PostgreSQL database with: pg_dump -U user-name -d db-name -f dumpfile which I then proceed to restore in another database with: psql X -U postgres -d db-name-b -f ...
4
votes
2answers
125 views

Removing 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 ...
1
vote
1answer
98 views

PostgreSQL: Another seq scan where an index scan is expected

Here's the query: SELECT DISTINCT ON(points.track_id) participants.contest_number, points.track_id, points.lat, points.lon, points.alt, points.timestamp, points.h_speed, ...
2
votes
1answer
2k views

Returning rows in PostgreSQL with a table called “user” [duplicate]

I have a table called user I have some SQL that is select User.* from User This fails because User is a reserved word however, I was under the impression that Postgresql didn't care about the case ...
5
votes
2answers
9k views

Is Data Warehousing possible in MySQL and PostgresSQL [closed]

I am fairly new to DB design and development. My requirement is simple drilldown/slicing based on time and language of words (in a language on a particular day). However, my db is mysql. But so far I ...
1
vote
2answers
1k views

Change permissions of postgres copy to exported file

I have asked this question on SO but perhaps that was the wrong location. Apologies for double posting but the question may have a better audience here. The original question is: ...
2
votes
1answer
569 views

Diagnosing the error in a Postgresql to Redshift migration through psycopg2

I am running a job class that contains the following: A Postgresql connection that can issue SQL statements A Redshift connection that can do the same an S3 connection to function as an intermediary ...
1
vote
0answers
84 views

Implementing a functionality for processing heavy insertion

I use PostgreSQL 9.1. The scenario is: I receive heavy insertion into Table1 (about 100 rows per sec). For each new row, I have to check the previous and next row of the source table if those are ...
9
votes
1answer
409 views

In Postgres, how to get a list of current defined savepoint?

I'm using postgres SAVEPOINT which create a new savepoint within the current transaction, and would like to display the list of currently defined savepoint in a connection. To be more precise: I'd ...
0
votes
0answers
159 views

Reset password for 'postgres' on v9.3 (Win Srv)

I'm trying to reset the password of the user 'postgres' on a postgres 9.3 installation, but have been unable to do so... I've tried every combination in pg_hba.conf I could find online (ex. 'host all ...
1
vote
1answer
118 views

Best way to add Foreign Key to massive table?

Say I have 4 tables: arrival (~100 million rows), departure (~100 million rows), airport (~30 million rows), airplane (small). arrival and departure each have 2 ForeignKeys: one to airport, one to ...
0
votes
1answer
181 views

PostgreSQL replication with periodic log shipping

I'm using Windows Server 2008 R2 with 64-bit PostgreSQL 9.2 on both test machines. What I wish to achieve is that one server will be a master and other will be a slave. This is just for tests, finally ...
5
votes
1answer
397 views

Rounding issues?

Try this: create table test (f float); insert into test values (330.0); commit; select (8 + 330.0/60)::int; --14 select (8 + f/60)::int from test; --14 select (9 + 330.0/60)::int; --15 select (9 + ...
2
votes
2answers
1k views

Are transactions in PostgreSQL via `psycopg2` per-cursor or per-connection?

I'm doing some work with PostgreSQL 9.3 using the psycopg2 database API. I have the DB API set in the minimum isolation level ("autocommit" mode), and am managing my own transactions directly via ...
1
vote
1answer
416 views

What's the best solution for offline db syncing

I'm building a system which requires a master db (BIG master) that contains things like accounts, balances, actions, etc. This db then needs to be accessible at a physical place, like a fairground ...
1
vote
0answers
31 views

Postgres_Failover Not Working

I was able to configure and Replicate between master and Slave ,so when we insert anything on master db it will automatically replicate to slave, Now,requirement is that if we shutdown master can we ...
1
vote
0answers
466 views

Getting vacuumdb :invalid page header in block error while vacuuming

I am newbie to PostgreSQL and using version 9.2.Disk space for data folder is full causing DB to stop. When i am trying to perform a vacuum to reclaim space, i am getting below error. vacuumdb: ...
0
votes
0answers
17 views

Need separate columns that calculates percentage [duplicate]

I have the following table: NAME ------ Alex Bob Bob Tim Alex Roger I need to produce the following: Name Count Percentage ------------------------- Alex 2 33% Bob 2 33% ...
2
votes
6answers
3k views

Need separate columns that calculate percentage

I have the following table: NAME Alex Bob Bob Tim Alex Roger I need to produce the following: Name Count Percentage Alex 2 33% Bob 2 33% Roger 1 16.6% Tim 1 ...
0
votes
1answer
132 views

Translating MySQL query to PostgreSQL

I have a query which works fine in MySQL, however when I try to recreate the same query in PostgreSQL (same DB structure) I just get a syntax error. MySQL: SELECT ticket.queue_id, queue.name, ...
1
vote
1answer
205 views

UPSERT statement never completes, infinite loop?

Based on some of the stackoverflow answers I wrote the following UPSERT statement, which I think must be stuck in an infinite loop. I added a statement in there to avoid an infinite loop (as it would ...
1
vote
0answers
179 views

listen_addresses does not respect postgresql.conf

I have PostgreSQL 9.3, and I'm trying to set it up on CentOS. One part that has been driving me nuts is the listen_addresses setting. I set it to * inside postgresql.conf: listen_addresses = '*' ...
8
votes
2answers
34k views

psql: could not connect to server: No such file or directory

The error in its entirety reads: psql: could not connect to server: No such file or directory. Is the server running locally and accepting connections on Unix domain socket ...
1
vote
1answer
891 views

Bulk insert in multiple tables

I have two tables on which I perform some bulk inserts: key: key_id(pk), key_name related_key: key_id(fk), related_key_id First Insert: values_data = "($$key_1$$), ($$key_2$$)" INSERT INTO key ...
0
votes
1answer
81 views

API on top of postgresql

I'm looking for one or several API's that can be put on top of postgres to make data input more dynamic. What I'm looking for is something that can handle a wider range of protocols and differently ...
8
votes
1answer
766 views

Adding nullable column to table costs more than 10 minutes

I have problems to add a new column on a table. I tried to run it a couple of times, but after more than 10 minutes running, I decided to cancel the query because of lock time. ALTER TABLE mytable ...
1
vote
1answer
357 views

create trigger hangs

I have a trigger function that just copies inserted values to another table. Then, each night I need to drop and recreate this trigger for some export operation. --trigger function CREATE OR ...
0
votes
1answer
34 views

Separation of users columns in another table

I've got a quite a lot of columns on the users table and I have been cleaning it up recently. Now since I'm searching over the users I figured it would improve performance if I separated verification ...