Questions tagged [postgres]

PostgreSQL, A.K.A Postgres, is an open source object-relational database management system (ORDBMS).

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1answer
46 views

SQL: Analytics event value that can be string or number

I'm using a PostgreSQL database and I want to create an analytics table that has a many-to-one relationship with an analytics_type table where analytics_type_id is the foreign key. The table also has ...
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1answer
73 views

Commit instead of rollback? [closed]

Simple example (PSEUDO CODE): for (int i = 0; i < 100; i++) { START TRANSACTION; SELECT id, name FROM employees WHERE id = i; IF (someFunction(id)) { ROLLBACK; ...
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1answer
73 views

Should I use a database as gateway to other services? [closed]

The context I have an IoT project where the sensors are sending data to my Postgres database. The sensors are manages by a stand-alone service which provides a REST API to query various information ...
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1answer
98 views

Worried about too many joins when fetching multiple datatypes in a single postgres query

Its not exactly my use case (would take too long too explain), but imagine a task management application where tasks for employees are displayed in a list along with some information about that task. ...
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2answers
96 views

Reading a large CSV file and then loading data to a DB

I have a Django application of 2 GB running and I need to receive a CSV file of more than 1 GB, read it and load the data to a PostgreSQL DB in IBM Cloud. The problem is that if I receive the file, it ...
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48 views

How to model a simple chat system as a microservice architecture?

In an attempt to learn how microservices work, I'm going to attempt to convert a simple monolithic chat server to a microservice architecture. I've created a simple chat system as a monolith, modelled ...
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1answer
34 views

Postgres: Storing a task instruction to be run on a schedule, with multiple workers

As a prerequisite I will say that we are wedded to postgres to provide this solution. This is a very broad problem, and I think it must be solved many times over, but unfortunately as it's so general ...
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1answer
76 views

Processing large number of messages in a thread-safe manner

I have the following use case and would like to implement it in a thread-safe manner. Think of a Stack Overflow-like web application. Somebody upvotes a question. A new event is sent to the message ...
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2answers
155 views

Foreign Keys and Eventual Consistency

We have a project that loads metric data from various etls and services into an AWS SQS queue, where that data is processed and inserted into a metrics database, also running on AWS RDS. When we ...
3
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1answer
58 views

Reorderable parent/children hierarchy in a relational database

I'm struggling on a design question for my Ruby on Rails website. I'm working on an estimation tool for construction companies for renovation projects. It orders items this way by default: Room (ex: ...
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0answers
59 views

What is the best practice for hierarchical container - item relationship in a SQL database?

I am in the process of designing a database organizing real world items in different storage locations. One main principle is that items can contain other items. So the relevant table is: An "...
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0answers
51 views

How can I design a secure content verification web application?

In my country, there is a high number of fraudulent doctor's sick letter as they are manually written on paper. I'm designing a web application to combat this issue and have the whole process ...
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2answers
292 views

Database Design: Storing price date wise, or date range wise?

I must store prices for various items on multiple dates. The table schema would look like this: CREATE TABLE date_wise_price ( item_code varchar, date date, price numeric(19,4) ) An ...
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1answer
115 views

Sharding rule updating on DB scaling

When you have sharding, horizontal partitioning, you have multiple DBMS instances, and your server app chooses which one to use by some rule that uses record IDs. Well, for example, we have ...
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3answers
175 views

Should I denomralize my DB schema for a multi tenant application

I am working on a multi-tenant application that's using a shared Postgres db for all tenants. All entities in the DB are connected (directly or indirectly) to a tenant, for example: Tenant --has many--...
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1answer
256 views

Race conditions in API calls within Golang microservices

I have a microservice architecture running on Heroku. I am having some problems handling race conditions. The problem is, that service A: Needs to fetch the user's balance through an API call to ...
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2answers
130 views

Caching expensive sql queries on first page load

I have a web application with an express/node backend using typeorm and PostgreSQL. The home page in my app is a query with lots of inner joins that shows the user a complex report. This query takes ...
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2answers
152 views

Is it true that ORM allows for changing the type of SQL that you use easily?

Hey so I have been looking into ORM since my last question and I am wondering. Instead of worrying alot right now about whether I will use mysql, postgre, or sqlite, would it be better to use ORM ...
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1answer
60 views

Sync local database with remote

My client has a business which work mostly in remote areas where internet felicity is limited, We have a central database and the branches in remote areas need to connect to the central database. We ...
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1answer
481 views

Doing data manipulation on server side vs client side

Im building a project that stores time series data on a per user basis. On the dashboard of the user it'll show some simple statistical analysis like averages but more importantly, it'll create charts ...
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1answer
249 views

Adding unstructured data to a relational database (PostgreSQL)

I'm building a project and I only know the MERN stack. Everywhere I see the general consensus is that Mongo is not good and should only be used in very specific use cases. More importantly, I also ...
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1answer
89 views

Should I perform some minor denormalization to save myself several queries in the future?

I'm in charge of designing the entire backend for the REST API of an application that works more or less like an online browser game (think OGAME, Travian, and the likes). In this game, players are ...
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1answer
42 views

Data integrity on polymorphic association to two different table

Let's say I have a very large student list want to filter if each of these students is satisfying some specific classroom school and classroom limitations. So, in my data model, I have School and ...
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2answers
79 views

How to use strict schema with seemingly fluid data type

Our company is trying to find a good generic way to have Many-to-One data for an entity. For example, a user might have 1 primary email, but many other emails also attached to their account. So we ...
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0answers
35 views

Recommendations for data clustering in an application

I am making a social media app. I have a use case in which i have to cluster similar type of data. For example, take Instagram. When a user likes a post, we get a notification that 'x likes your post'...
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1answer
993 views

Using PostgreSQL MD5 hash to calculate a 64 bit hash value for advisory lock functions?

I have a particular problem addressing the PostgreSQL advisory locking functions using the bigint variants. Basically I want to create a 64 bit bigint value from a text type obtained with the ...
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0answers
273 views

Running a high availability PostgreSQL cluster on native AWS services only

Backstory: I am unable to use RDS, as I need to install cartridges in my PostgreSQL instances. I have been trying to pin down an architecture for PostgreSQL running on EC2 instances for a few days. ...
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1answer
848 views

Elasticsearch and PostgreSQL combination

I have a marketplace application and I stored data in a PostgreSQL. I have performance problem for product search, I know I can improve search performance if I use Elasticsearch instead of PostgreSQL ...
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1answer
611 views

Optimizing inserting/storing Large amount of data in database

We have a POST API that takes data from the Client and send it to different applications (Payment, Email, SMS). We also store all the data sent by the Client in a database for future analytics ...
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0answers
77 views

Architecture recommendation for dynamic integration of algorithms/scripts

I am looking for a simple software architecture that is able to evaluate user data using different versions of algorithms. According to my concept, the user is able to upload tabular data via a Web ...
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2answers
2k views

Retry a failed REST API request - Java/Postgres

We have a REST API which calls a third-party REST API to Send Emails. The Third Party API is not super reliable and randomly fails every now and then with a 500. Our Clients do not want to retry at ...
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34 views

Building a Feed Handler and Persisting JSON Data to Postgresql

I'm starting a pet project and would like some advice. I need to perform the following: Scrape JSON Data from a REST API Save the Data into my Postgresql table Paginate through the rest API and ...
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1answer
72 views

Which is better for my use case? A hybrid customer data model or a document store customer data model?

I am trying to get some preliminary insight into the pros and cons of using either a hybrid model (jsonb document-relational) or an all jsonb document store model for customer data in PostgreSQL. Both ...
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2answers
772 views

When self-referencing in a table, do you prefer `parent_id = null` or `parent_id = id` for a row referencing to itself?

For the discussion, I will provide my example. But I am interested in the broad guidelines. I save in my postgres DB legislation (law texts) composed of a single header (H), paragraphs (P), sub-...
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0answers
49 views

Building a schedule app - best design pattern for collection on Rails API

I’m building a web app using Rails API on server side. The goal is to make a planning manager. I want my users to be able to plan ‘daily’ events, which will display at some specific weekdays, with ...
0
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1answer
45 views

Temporary users to restrict db access of query?

I am new to database managment, and I am wondering if it is a good idea to create temporary users to restrict access to only a single table. Like having an user named _logs can only (read?) and ...
1
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2answers
414 views

Architecture for RESTful API and a web admin

I am trying to build a RESTful API (using Flask) that will be later consumed by a mobile application. I also have a requirement to build a Web Admin. The Web Admin will have functionality that will ...
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5answers
1k views

Do I really need triggers for relational database, for example, PostgreSQL?

I know that triggers can be used to validate stored data to keep database consistent. However, why not perform validation of data on the application side before storing them into the database? For ...
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0answers
549 views

Performance impact of JPARepository save() on a large database table with index

We have a few tables with a large amount of data and with indexes on those tables to help in faster retrieval. We are also using Spring Data JPA JpaRepository for adding data to those tables using the ...
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1answer
55 views

In a parent table - Child table relation , where to store order of children

Assume a Parent -> Child relationship in RDBMS. questionnaire table and question table. question table has a foreign key questionnaire_id to store which questionnaire it belongs to. Questionaire ...
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1answer
86 views

How to ease the pain of lack of diffs when using database migrations?

The pain that I've often felt when creating database migration files, is best described in this Speakerdeck: Sane Database Change Management with Sqitch. Paste entire function to new "up" ...
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2answers
649 views

Database Schema for a multiplayer quiz game

I'm trying to accomplish this scenario : There are 2 types of users, let's say Admin and Worker, and there have different roles. Admin can do a CRUD of questions, and also can create a room where ...
2
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2answers
572 views

Index / Unique on `deleted_at` column?

We have an Accounts table in a Postgres DB that has a unique index on user_id and product. Users can have many accounts, there's no product table. Occasionally users will create an account ...
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2answers
584 views

Scalability: Millions of tables vs one big master table and millions of views

We have to migrate an old (million LOC) system from SAP ADS (formerly Sybase) ISAM based (so called free tables) based system to a PostgreSQL database. The system implements kind of multitenancy ...
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1answer
90 views

Bulk Inserting Data with Duplicates or Line by Line Insertion Without

I am loading a large amount of data (2,000 files with about 30,000 rows, 30 columns) for use in a Django application. The files are based on 40 different templates. The column names are consistent ...
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1answer
385 views

Best way to model pricelist per customer for products in webshop

I am making a b2b-webshop system that will have multiple customers. Each customer will have a separate active pricelist which contains the products that they can buy and the prices that applies for ...
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1answer
108 views

Watchlist polling API NoSql vs Sql Frequent Updates

I am making a watchlist type application that will get all items being watched and then poll an api every ten minutes or so to check on its status. I am trying to design the database portion of this ...
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1answer
388 views

How to structure similar structs using Go and PostgreSQL without too much duplicate code

I am making a REST API in Go using PostgreSQL. Quick introduction: I suddenly have a case where I have different variations of the same basic entity, one of the variations have maybe 12 extra fields ...
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4answers
2k views

DB Enumerations vs App Enumerations vs Lookup tables

We started a project recently, and during the design process, we have some arguments among team members. We have to deal with enumerations so we ended up with three choices. Have the enumerations as ...
2
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1answer
625 views

Web application with relational database - best practice?

I am currently designing a web application which is pretty similar to Twitter but with some unique features for my company. Technologies are Vue2, Spark framework and PostgreSQL. I am trying to ...