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5
votes
2answers
9k views

Very slow DELETE in PostgreSQL, workaround?

I have a database on PostgreSQL 9.2 that has a main schema with around 70 tables and a variable number of identically structured per-client schemas of 30 tables each. The client schemas have foreign ...
2
votes
1answer
24 views

Limited utility in RECURSIVE VIEWS?

In the docs for recursive queries with WITH, you'll find this Recursive queries are typically used to deal with hierarchical or tree-structured data. This seems to be true, but how does this ...
0
votes
1answer
16 views

Finding time ranges in multiple rows

I have a table with (suppose) just 2 columns: - fecha (a date) - ignicion (0/1 representing boolean state) The goal is to retrieve which periods of time was ignicion held at '1', for such task I ...
1
vote
0answers
22 views

What are the pros and cons of storing two values in an array instead of two columns?

I have a project that plans to store an away team and a home team. I'm wondering if it is better to store the teams in a single array column like this: {Harvard,Colorado} Or create away_team and ...
0
votes
0answers
11 views

SQL query for setting value

I found this example for configuration databse tables: http://stackoverflow.com/questions/10204902/database-design-for-user-settings Can you show me some example for SQL query for getting ...
2
votes
0answers
33 views

Postgres update query complaining about text value when only NULL values are passed

I am using Postgres 9.4.6. Is there any reason why the below update query would execute successfully here:- UPDATE "Predictions" SET "userid" = c."userid", "Fixture_No" = ...
0
votes
0answers
20 views

Backup options for database with large objects

I have a database that includes a table with references (as oids) to large objects that have been stored in the database via the JDBC Large Object manager. I need to make regular backups of the ...
0
votes
0answers
43 views

Postgres wont install on windows 7 64 bit (Failed to load SQL modules into table)

I have been trying to install standard postgres 9.3 onto a windows 7 Machine. every single time it gives the same error: Failed to load SQL modules into table I have tried (from this question ...
5
votes
2answers
4k views

How to partition existing table in postgres?

I would like to partition a table with 1M+ rows by date range. How is this commonly done without requiring much downtime or risking losing data? Here are the strategies I am considering, but open to ...
0
votes
1answer
30 views

Adding and populating column in Postgres with data from existing column

I have a TEXT column in one of my existing database tables that holds both domain names and IP addresses. I'd like to add a new column to the existing table that's of type INET and populate it with ...
7
votes
2answers
156 views

Normalizing a table with a field that generally uniquely identifies a row, but is sometimes null

forgive me if this has been asked and answered before. I'm roughing out a schema for an inventory management system, to be implemented in PostgreSQL. All of our products and services have a sku. ...
0
votes
1answer
22 views

Postgresql maintainenace queries fail with foreignkey violation

I maintain a Django app with a postgresql backend, where users post interesting URLs (links) and then either leave replies under these or upvote/downvote them. All this is done via 4 postgresql tables ...
0
votes
1answer
39 views

How do I find the day of week of a date-time field in postgres?

How do I find the day of week of a date-time field? I'm trying to extract the the day of the week from a column in a sql query in postgres. While SELECT EXTRACT(DOW FROM '2011-07-07') works, the ...
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 ...
3
votes
1answer
33 views

What permissions are required to return rows from information_schema.schemata?

In postgres (I'm on 9.3.4) what permissions are required to return rows for select * from information_schema.schemata The 9.3 documentation says "are owned by a currently enabled role". Does that ...
1
vote
0answers
43 views

My simple FK constraints appear to have been ignored. How?

I have two tables, device and platform where device.platform_id enforces the following constraint: Foreign-key constraints: "device_platform_id_fkey" FOREIGN KEY (platform_id) REFERENCES ...
0
votes
0answers
20 views

Postgresql: find out all columns that have particular string and count the number

I want to create a function like this: enter table name and a particular text, then return a table that have 3 columns the : table name , column name, the number of that column have the particular ...
5
votes
3answers
2k views

Transactions within a Transaction

What behaviour would PostgreSQL display if for example the script below were called BEGIN; SELECT * FROM foo; INSERT INTO foo(name) VALUES ('bar'); BEGIN; <- The point of interest END; Would ...
0
votes
0answers
18 views

PostgreSQL 9.3 overlapping pg_dump commands

I'm wanting to do a pg_dump or pg_dumpall of a database every 10 minutes. Unfortunately the database takes longer then 10 minutes to write out. This post confirms that database dumps produce ...
1
vote
1answer
27 views

Show Dollar Amount By Name On A Month To Month Basis

I want to show dollar amount by name on a month to month basis, but my syntax gives me an entry for each different dollar amount. Below is what I get from my query (subset of data) Name Value ...
3
votes
1answer
195 views

Should database be denormalized if I need an index across multiple tables

I have a catalog of album and song names. The song has a foreign key to the album table. I expect queries like: SELECT * FROM song s JOIN album a ON a.id = s.album_id WHERE LOWER(CONCAT_WS(' ', ...
-4
votes
2answers
31 views

Postgres relationship statement [closed]

Lets say I have the table parents. A parent has many kids and a kid has many toys What would be the best way to do a SELECT statement for the parent and grab all of kids associated with that parent ...
4
votes
1answer
74 views

Persistent inserts in a UDF even if the function aborts

I have a rather complicated UDF (moves around a bunch of tables as well as creates a bunch of new ones) where multiple aborts may occur. Before every operation I would like to record the time when an ...
0
votes
2answers
27 views

Group By Month With Overlapping years

I want my query to show all months grouped together, regardless of the year. For example, I would want this to be the output: 01/13/2015 01/01/2016 02/07/2015 02/01/2016 This is sample DDL - what ...
1
vote
1answer
20 views

INDEX size as bytes - PostgreSQL 9.2

Is there any way to get this query to return the index size as BYTES? SELECT relid::regclass AS table, indexrelid::regclass AS index, ...
5
votes
1answer
57 views

Indexes: integer vs string performance if the number of nodes in the index is the same

I hope this is the right place to ask! I am developing an application in Ruby on Rails with the PostgreSQL (9.4) database. For my use case, columns in tables will be looked up very frequently, as the ...
1
vote
1answer
20 views

Postgresql: compare record against sibling, but limit search only to active records

I'm trying to find a way to compare records against it's sibling record while limiting the comparison only to the most recent entry for each set. I know it does not make to much sense so I'll go ...
3
votes
1answer
131 views

Delete duplicate records with no change in between

I have a products table where I insert around 150,000 records a day. Most of them are redundant, but I need to keep them because of the new expiration date. I get product feeds from about 5 out of 30 ...
2
votes
1answer
117 views

Foreign key for array column [duplicate]

I have a table: CREATE TABLE methods ( method_id serial PRIMARY KEY, method_name varchar(100) ); I now want to create a table with the following columns: CREATE TABLE experiments ( ...
1
vote
1answer
77 views

postgres wal sender replication timeout during pg_basebackup

Let me start with the caveat that I am still green with Postgres. I am working on a postgres 9.2 Active/Standby cluster on Debian wheezy for an application, based off of the ClusterLabs pgsql cluster ...
1
vote
1answer
18 views

PostgreSQL ntile() partition

i have a point grid with population values. each point has an id and population value. i also have an state_id which say in what state the point is. now i want to calculate the percentile ntile(100) ...
4
votes
1answer
41 views

PostgreSQL join subquery can't restrict query

I'm working on a check-splitting project that splits out amount owed for an activity. Users can be a part of multiple 'groups', which each have their own running balances. I'm trying to run a query ...
0
votes
0answers
21 views

Postgresql relation from array column to multiple ids [duplicate]

I`m trying to create a simple postgresql database for payments accounting. Here are sql codes for several tables in my db. CREATE TABLE "buh"."campaign" ( "id" SERIAL NOT NULL, ...
1
vote
1answer
238 views

Postgresql - Minor version upgrade 9.3.5 to 9.3.6 on Ubuntu

I am two servers: A & B. My master database is running on A and the version is 9.3.5. It's replica is running on B and the version is 9.3.6. I am trying to use B as UPSTREAM slave, and trying to ...
4
votes
1answer
3k views

PgPool 2 with HA Proxy

So, I'm looking to add high availability to a postgresql server. I've looked into some tutorials on the web but, haven't been able to find exactly what I'm looking for. E.g.: PostgreSQL ...
0
votes
1answer
32 views

Set values conditionally in Postgres UPSERT

We have an UPSERT feature achieved through on conflict do set. How can I set the values conditionally in the set statement, like if(excluded.col1 is null) col1=table.col1 else col1=excluded.col1 ...
2
votes
0answers
10 views

In PostgreSQL, can you read from an index during a ALTER INDEX … SET TABLESPACE operation?

I have a PostgreSQL 9.3 server, and there's a large index that I want to move to another tablespace on another disk, because I want to free up space on the original disk. However this is a production ...
4
votes
2answers
104 views

Grouping by sequential relationships with Postgres

This is quite similar to this question about continuous ranges, and this question about grouping by sequential numbers, but differs in that the sequences are not numeric. Given the following ...
9
votes
3answers
5k views

What is a valid use case for using TIMESTAMP WITHOUT TIME ZONE

There is a long and quite elucidating answer on the differences between TIMESTAMP WITH TIME ZONE -vs- TIMESTAMP WITHOUT TIME ZONE available in this SO post. What I would like to know is: are there ...
6
votes
1answer
51 views

Does issuing DDL against a view in PostgreSQL take out the same locks as issuing DDL against a table?

I understand that views are implemented using the rule system but I'm unclear if this has any advantages/disadvantages when running transactional DDL against them. Does issuing CREATE OR REPLACE VIEW ...
1
vote
1answer
709 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 ...
11
votes
2answers
8k views

Moving postgresql data to different drive

I am using AWS as my cloud environment. I installed PostgreSQL on the same drive as my root instance volume. I have attached and mounted the second drive to my instance. Now I want to move all my ...
0
votes
1answer
210 views

can't install citext extension: could not access file “$libdir/citext”: No such file or directory

I'm trying to get citext available as a type in a specific database. The Postgres database server is 9.4. I see it on the server in the pg_catalog's pg_available_extensions view. From the psql ...
0
votes
1answer
15 views

postgres full text search modifies ts_query

I have following query: select vec.vec, vec @@ to_tsquery($$'fabr':*A$$), -- true to_tsquery($$'fabr':*A$$), -- fabr vec @@ to_tsquery($$'fabry':*A$$), -- false ...
1
vote
0answers
33 views

Function for matching email address returns full table of emails

I am using Postgres 9.4.6. I have created a Function for finding email address that match an email variable that is passed. However, when I search for 'user@email.com' I get a full table of email ...
0
votes
0answers
41 views

Knowing the most juicy client!

Good evening! I'm studying business informatics in Paris and I just created an amazing database that will help the supermarket down my street to win the loyalty of its clients. We want to know, ...
0
votes
1answer
99 views

Trigger function - PostgreSQL 9.2

The idea: 1 - The customer can add any value into users.code column 2 - If the customer does not insert data into it, the trigger/funciton has to do the job I am able to do that, using this SQL: ...
1
vote
1answer
30 views

How to set up Amazon RDS parameter group for Postgres?

I'm trying to create a parameter group in Amazon Web Services for an Postgres 9.5 RDS instance. I'm a little confused by the units being used for things such as shared_buffers and min_wal_size. ...
1
vote
0answers
48 views

Replicate Postgres 9.2 to 9.4 with no downtime

My current set up has a database running on Postgres 9.2.4 and would like to move from AWS EC2 to RDS. However, AWS requires Postgres be running at least Postgres 9.4 in order to perform this ...
0
votes
1answer
25 views

How to duplicate the database in postgresql?

I need to duplicate the existing database including its schema and structure to another new database. I need this in shell command environment and not in pgadmin. Please kindly help me. nohup pg_dump ...