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Search results mismatch after postgresql update

Today we had to update the PostgreSQL version on our database servers. Before update the version was 9.3.4 and the new one is 9.3.6. Despite the small difference in the database version and the ...
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152 views

Can I setup database triggers to run on a defined secondary set of servers only? [closed]

This might sound a bit off, but here's what I have been thinking for a while now: Use Case You want to build an activity log for each user action on your application using database (postgreSQL) ...
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1answer
548 views

Can't get Dell PE T420 (Perc H710) perform better than a MacMini with PostgreSQL

It's months that I'm trying to solve a performance issue with PostgreSQL. SYSTEM CONFIGURATION Our deployment machine is a Dell PowerEdge T420 with a Perc H710 RAID controller configured in this way:...
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38 views

Error on slave2 after promoting slave1 to master in cascaded streaming replication

I've a setup like MASTER -> SLAVE1 -> SLAVE2. MASTER and SLAVE2 are running on different ports on single server. SLAVE1 in on another server. For testing purpose I've powered off my first server ...
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1answer
48 views

Migrating from 32 bit using pg_basebackup

Has anyone migrated a 32 bit postgres 9.2 database to a 64 bit postgres 9.2? I'm trying to use pg_basebackup but I'm not sure whether this is the right approach.
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235 views

PostgreSQL pg_upgrade --link mode performance issue after upgrade

Trying to do PostgreSQL upgrade from 9.0 to 9.3. I'm using pg_upgrade with the --link mode since the downtime is very minimal compared to other options like pg_dumpall and pg_upgrade without using --...
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1answer
183 views

Migration From Oracle to PostgreSQL Encoding Errors

I'm working on migrating data from an oracle database to a postgresql database. I running into a problem where I export the data from oracle, using sql developer, and importing it into postgresql. ...
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2answers
2k views

Creating a database under a different owner

I'm trying to set up a role in Postgres which can a) Create a new Role b) Create a new Database c) Make that new Role the owner of the database d) Have no other rights (as far as is possible!) I have ...
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96 views

Unique Index much bigger than the table itself

Pg 9.3 on debian 7. I have a very huge table in rows, about 178 million (will turn 250 million in a week and then grow 500 thousand a day), but not that huge in size, wich is 20GB, it's a small ...
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62 views

Is there a way to improve this query further?

I've got a query that over time I've been improving. Originally it simply selected * from the records table, and the data was formatted on the webapp side. But that was slow and I wanted to make ...
2
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1answer
47 views

How to keep updates (diffs) of some entity in the database

What is the best way to keep updates (diffs) of the some entity in the database? At StackOverflow we can edit questions and answers. And then we can look at any revision of the question or answer we ...
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1answer
201 views

Postgres - Insert performance with indexes

We have a table with about 20 columns in a Postgres 9.2.10 DB. For better performance on some SELECT queries, we plan to add an index on one column with data type timestamp. As the index also can slow ...
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1k views

Trigger function check if all NEW.* fields exist in another table

In PostgreSQL I need to code a trigger function that checks if all the fields in NEW.* exist in another table that has the exact same name as the table that fired the trigger but appended with "_hv". ...
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84 views

Making ordinal synonyms for Postgres full text search

I have a Postgres 9.3 database where users are mostly searching for locations by a combination of name and/or address (or fragments of). An example of an address would be "123 8th st". I've been ...
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1answer
113 views

Postgres - count of GROUP BY

I am trying to determine the total number of contributors in an image database who have contributed at least five images. The following query will give me counts of images by contributor, but that's ...
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1answer
166 views

Return type of JOINing stored procedure - PostgreSQL

Is it possible to express return type of stored procedure that returns joined tables using table type of one of joined tables? My stored procedure looks like this: CREATE or REPLACE FUNCTION ...
2
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1answer
104 views

Select into specific position with array_agg on postgresql

Is there a way to set value in specific position inside array based on information from other columns (PostgreSQL-9.3 and later)? For example I would like to select an item and its stock information ...
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29 views

Restricting user to a single db in postgresql [duplicate]

I've a PostgreSQL Server with 5 db and 2 users: postgres and forge, both with Superuser attribute. I want to create a third user that can only see and use one and just one of the db and by using it I ...
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232 views

PostgreSQL trigger copy record to another table with different columns order

I have a trigger that before every update on hundreds of tables it inserts into a table with the same name and the _hv suffix a copy of the record being updated to maintain a kind of historical ...
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1answer
558 views

How to return values from “upsert” query in case when UPDATE has been performed?

WITH upsert AS (UPDATE tbl SET a = 2 WHERE a = 1 RETURNING tbl.*) INSERT INTO tbl (a) SELECT 1 WHERE NOT EXISTS( SELECT * FROM upsert ) RETURNING * This "upsert" statement works however I would like ...
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1answer
148 views

Maximum Partitioning PostgreSQL

I have 400,000 records I need to partition. The records will increase 100,000 per year and those new records might need to have 1000 new partitions added. Here are some of my concerns: How many ...
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1answer
35 views

Search for authors whose records are separated by at least X days

I am using Postgres and have a table which contains metadata about several million images - many of which have the same author. I am looking for contributors who add content regularly - not people ...
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1answer
183 views

Why do we need partitions in PostgresSQL? (or any other RDBMS)

So, I am trying to teach myself partitions in PostgreSQL. I understand that a database can become slow when a table hits millions+ of lines and indexes don't fit into memory anymore. One thing that ...
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52 views

List all columns and rows of PostgreSQL table with a view limit

I am currently using select * from items; to show my table during development however I am finding it a bit messy now as some the strings I am adding to the table are 1,000+ chars long. Is there a ...
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152 views

Postgres tablespace on mounted usb

I've got postgres 9.1 running on raspbian installed with apt-get. I've got NTFS usb HDD mounted in /mnt/usb. What I'd like to achieve is to create a tablespace pointing to /mnt/usb/postgres so I ...
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1answer
626 views

Problems restoring backup from base backup + WAL with WAL-E

I'm trying to do nightly restores of the main database on a separate node. I want to do weekly full restores and nightly restores by consuming the latest WAL files. On the master I have wal_level = ...
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559 views

Display only table names in psql

How can I print only table names from a specified database in psql? That is, if I have tables called "table1" and "table2" then the output will be: table1 table2 and only that. I've been trying ...
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825 views

GRANT USAGE on all schemas in a database? postgres

I want to GRANT USAGE to a user/role for a given database. The database has many schemas. I know there's an ON ALL TABLES IN SCHEMA, but I want "all schemas". I tried GRANT USAGE .. ON DATABASE, but ...
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2answers
294 views

Guid vs. integer ID for unique fields

This is really a generic question. Suppose I have a replication pattern of a single write DB and multiple read DB replication slaves - I do not have to have GUID's as my unique IDs fields. Is that a ...
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24 views

Trouble renaming a PostgreSQL database [duplicate]

Trying to rename a postgres database: $ psql -d some_other_database some_other_database=# ALTER DATABASE myapp_development RENAME TO myapp_development_old some_other_database-# \l ...
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1answer
649 views

Updating table of versioned rows with historical records in PostgreSQL

I have a master table of versioned rows: CREATE TABLE master ( id SERIAL PRIMARY KEY, rec_id integer, val text, valid_on date[], valid_during daterange ); INSERT INTO master (...
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1answer
205 views

Stop PostgreSQL from logging statements on error

My postgresql 9.3 logs are sprinkled with entries like these (redacted to protect the guilty): STATEMENT: INSERT INTO table (key, value) VALUES ($1, $2) ERROR: duplicate key value violates unique ...
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966 views

Does Postgres preserve insertion order of records?

For example when I'm using query which returns record ids INSERT INTO projects(name) VALUES (name1), (name2), (name3) returning id; Which produce output: 1 2 3 Will this ids point to ...
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2answers
532 views

Unique across tables

I have a table containing users. Each user has a primary email and a flag indicating if the user is deleted or not (we never hard-delete users). However, each user can also have additional emails. ...
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281 views

Postgresql: Update or insert stuck

I'm running update-or-insert query on a table of approximatelly 3mln rows, 4 columns. Query is part of every day process, and for same days, the query stucks forever. It's just blocked. It's ...
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121 views

Postgres: difference between CTE and temporary table

In Postgres is there a difference between a CTE and a temporary table other than the fact that the CTE exists just for the context of one statement? Documentation says that Common Table ...
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137 views

Clarification on UNION ALL of JSONB_EACH result

This function used to merge 2 JSONB and delete certain key when the value is null, refer to this question. CREATE FUNCTION jsonb_merge(JSONB, JSONB) RETURNS JSONB AS $$ WITH json_union AS ( ...
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1answer
3k views

PostgreSQL update and delete property from JSONB column

From this article, I tried to update or delete property of a JSONB column: CREATE TABLE xxx (id BIGSERIAL, data JSONB); INSERT INTO xxx(data) VALUES( '{"a":1,"b":2}' ); SELECT * FROM data; id | ...
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100 views

Postgres: Can't free space because I have no space

I have a Postgres DB that someone was brilliant enough to install in the log partition of my linux box. It has a serious index problem, with indexes ballooning up to 50GB per. As soon as I start ...
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1answer
52 views

Uniq join 3 tables with relationship table not uniq

I am using Postgres. I have 3 tables: table_1 id table_1_2 table_1_id, table_2_id table_2 id The problem is the relationship table table_1_2 is not uniq. I.e., table_1_2 will have the ...
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1answer
3k views

What limits the number of connections?

As per https://devcenter.heroku.com/articles/heroku-postgres-legacy-plans the connection limit is 500 As per https://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server "Generally, PostgreSQL on ...
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1answer
104 views

Can the number of tables and functions affect performance? [closed]

I have some big database with hundreds of functions and tables. They also have a lot of sequences, custom types and some views and triggers. There is a point when the quantity of objects will be a ...
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1answer
30 views

Could this ActiveRecord/SQL statement in my code base be susceptible to SQL injection?

I was reading up on SQL injection attacks from the Rails Guides and was wondering if the below line could be susceptible to a SQL Injection attack: accounts.where("lower(name) LIKE '%#{params[:query]....
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1answer
46 views

Is C collation suitable for my Postgres database?

I am working with 500m rows (120GB) in Postgres 9.4, and I am trying to make SELECT statements as fast as possible. I am less concerned about the speed of INSERT and UPDATE, because my data only ...
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2answers
2k views

Get ID which has two rows with different values for one column [closed]

Basically, I have a dataset that is a list of internal location identifiers attached to an ID (so each 'set' of geographical points has its own ID). So an 'id' column and a 'location' column exist in ...
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38 views

Can two databases share one data folder?

I'm planning to install a database (same configuration) on two separate machines, PC1 and PC2. PC1 is the main database while PC2 is the backup.. Is it possible that they can have the same datadir in ...
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1answer
737 views

Poor query performance due to recheck condition on index scan

We are testing the performance of metadata when stored in JSONB compared to a traditional EAV catalogue (commonly used in biomedical scenarios), using a PostgreSQL 9.4 server. I get a problem when ...
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3answers
338 views

Custom sorting of a query

The application I am working on displays some tasks based on status, and date (in that order). However, for a particular status, the sort condition should be inverted. For example, a table which looks ...
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2answers
4k views

Count data using multiple date ranges

Probably this has been asked before, but I can't figure it out. I have a phone_clicks table (sql fiddle http://sqlfiddle.com/#!15/855e0/1) CREATE TABLE phone_clicks ( id integer NOT NULL, ...
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1answer
49 views

Distinct rows by order

I have the following SQL, generated from ActiveRecord in Rails 4 (partly with the Geocoder gem) problem is, that even though DISTINCT is used, hopefully to get only unique items, the items returned ...