Questions tagged [nosql]
Databases that propose alternative solution to SQL (Relational) Database which can be document oriented, key/value, graph, objects,...
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SQL or NoSQL Database for a chat application?
currently I am working on a kind of "Chat" Application.
The app consists of "threads". Each of this threads consist of "subthreads" in wich a user can send a message (...
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Is DynamoDB optimistic locking with one version attribute for each field in an item a valid design pattern?
It's common to implement optimistic concurrency control in DynamoDB by giving each item in the database a top-level "version" attribute and only allowing an update of an item to succeed if ...
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How would I model my NoSQL database for a conversational bot
I'm currently developing a chatbot that will be used for booking trips. The particular party I'm interested in for now is the rider. I'm using AWS's DynamoDB, because it seemed to be the most flexible ...
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How to represent NoSQL entities
I've mainly studied SQL structures, and I know that the representation of the entities can look something like this:
However, I'm building this app with MongoDB, so NoSQL DB. I'm aware that MongoDB ...
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Store UUID Reference vs. storing string in Mongodb
I am trying to store user preference for notifications.
One way to do is store types of notification in separate collection and store UUID of that notification type in user table.
e.g. notification-...
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How to document a NoSQL document-based data model?
How do you document the logical data model of a document-oriented database like MongoDB?
For relational databases, Entity-Relationship diagrams or UML class diagrams are used.
What is the practice for ...
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Do NoSQL and non-relational refer to the exact same concept?
Question as the title says. Of course, I already tried searching online, but did not find a definite answer yet. (The sources I checked imply that the terms are interchangeable, but do not state this ...
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Avoid redundant field using JSON type in MySQL [closed]
I have experienc with designing relational dbs but first time attempting to store JSON in a mysql table. I am using mysql 5.7.8 which has the ability to store json data type as a column.
When I create ...
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Table design question - DynamoDB the right choice?
Our team has started to use AWS and one of our projects will require storing approval statuses of various recommendations in a table.
There are various things that identify a single recommendation, ...
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Is it a good practice to add a range key to an AWS dynamo table even if there is no need in current specification?
I am using AWS dynamodb for my project.
One can choose to use a simple key (partition key alone) or a composite key (partition key + range key) when creating a dynamo db table. But once it is created, ...
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Storing common data across tenants in NoSQL databases like mongoDB
We are designing a multi-tenant architecture. In our multi-tenant architecture, there are different email templates that are shared across all the tenants.
Email template looks like
subject: {...
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Saving & Referencing different Schema Types in MongoDB (e.g. for a CMS with Building Blocks)
Say I wanted to build my own CMS system and store data in MongoDB. I would like to have a Collection called BlogArticle. Each article can have a different structure, but will be put together by the ...
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Can I manage a NoSQL database with only JavaScript?
I am creating an app with Deno (a personal project), and I manage the "database" with only the Javascript code of the Deno enviroment, modifying JSON files like any other JS object. For me, ...
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AWS Architecture: How to search in Dynamodb?
Firstly, I want to state that this is my first time trying to build an app. I am doing this for fun, mostly as an exercise to learn system design/architecture. The goal is to build an app that would ...
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Can we do domain modelling or create domain entities/models in NoSQL like Amazon DynamoDB? If yes then how?
Recently I was going through an article (link at the end) on AWS for DynamoDB NoSQL and got to know that they are suggesting to only have a single table with certain access patterns in your NoSQL ...
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Thoughts on adding a DB collection with a single record for version
I'm building an application with Google Firebase and Firestore that has its structure defined in the DB.
This structure is not very big and doesn't change all that often. This structure is stored in ...
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Relational or non-relational database for storing and querying log data?
I'm planning to extend an application with logging of user events. (Client application via REST-API to Symfony). What is the preferred type of databases?
Currently the log data is stored in a ...
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When would I pick NoSQL over SQL when dealing with partly schema-less data?
so, I'm currently developing a feature for a website of mine, which aims to gather a set of financial data from the user so the user can start and take care of a budget, as well as the website ...
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How to create an Event-Driven Architecture with many external sources
I work for this Accounting company - as a Product Owner - that uses several external services (one for Contract management, another one for Accounting Demands management, a third one for Financial ...
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Does it make sense for a large scale SaaS project to use a single all powerful SQL/RDBMS database?
Scalability seems to be a thing now.
I was in a heated argument with one of my developer who insist on using MySQL for a data intensive application we are building. MySql is easy, fits the purpose and ...
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What's the use of a wide-column NoSQL db such as Cassandra over a K-V store or a document based db?
Say we're making a simple photo app. This link says that we can store the image in S3 and now have a URL. Great. Next, we need a mapping of a UserID to the many images they've created. For this, it ...
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Keeping JSON in database
I'm trying to create web app(flask or django-rest) that would scrape some data and save it to JSON so that it can be viewed in the frontend (VueJS).
I'm wondering if it is better to save the scraped ...
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Can I manage thousands of concurrent connections with a non-Node stack?
I'm developing a social network with Django (Python) + Postgres SQL. My site will have a chat feature so that users can communicate to each other in real-time, and the communication will be only from ...
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Creating group/application/user permissions around mongodb documents
I'm trying to find a good way to manage permissions for a high number of mongo documents.
What I want to do: Apply group/user/and or application permissions to mongo documents.
Idea 1: Use mysql to ...
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Saving large files like Credit Reports in Data Store - SQL/NoSQL/ObjectStore
I am working on a project to save external credit bureau reports in database. These reports are typically big and could go from 0.5MB to 5.0 MB. Number of files will grow exponentially over the time ...
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What *really* is the difference between relational and non-relational data?
Here is where I am at right now: I know that relational data, like that found in relational databases like MySQL or Postgres, is relational because there are relations between the tables. That is the ...
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Partial database synchronisation across multiple databases
Currently we are looking for a solution to sync databases across multiple locations. We a location hierarchy such as Country -> State -> District -> Center. To increase speed and reliability of the ...
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Storage and partitioning in Cosmos DB
I'm working on designing a system for reporting/storing information on hardware devices (IoT-like), and trying to figure out how that would best be structured in Azure's Cosmos DB.
Every device will ...
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Firebase prefer separate collections over mixed collection?
I'm writing an education app and my current Firebase structure looks like:
Course
∟ Lesson
∟ Modules (Includes video, audio, text and quiz modules in one collection)
Where "Course", "...
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Query by NoSQL keys versus SQL hash
I am trying to decide between a NoSQL (MongoDB) or a SQL (Oracle) database for my project. This database will be used to store output files from a set of parameters.
I can model this as a MongoDB ...
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System design for filtering/sorting objects whose properties are stored in distributed storage
Imagine that we have a storage of objects O (can be in SQL, NoSQL, doesn't matter) where the object contains some property P_1 to P_n. Some of these properties are stored in storage S1, some in ...
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Uncertain of cache solutions for CAD models
I am running a personal project of offering 3D model generation as a service (in this case CAD model). Since most of the generation of 3D models take a long time, I thought about using cache to ...
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Is it recommended to use schemas on non-relational databases?
I'm trying to figure out if the use of schemas on non-relational schemaless databases like MongoDB is a recommended practice or a bad practice to be avoided.
I am doing research work and am looking ...
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How should I best structure my app when I want to sort a "parent" model by a property computed on another "child" model?
Question about OO-programming, functional programming, NoSQL, SQL databases, and software architecture
Hi all,
I am a intermediate-level self-taught programmer, and have been dying to get an answer ...
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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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Designing database: split into different tables or group them together?
I am fairly new to database design and now trying to build my own forum-based application. The app will have nested categories as
countries > systems > levels > subjects
In every subject ...
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Gathering data from JSON fields in a relational database
I'm working on a small e-commerce solution which uses MySQL. At first there was an initiative by the boss to use MongoDB but I suggested relational database because there are lot entities with ...
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What is the correct way of setting and then differentiating between paid and free user in Firebase / Firestore?
I am developing a mobile application that will have both free and paid versions.
The way I see how I could differentiate between what is a paid and free user is to set a property isPaid on their ...
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Update items based on a read operations on same items is a bad practice?
DynamoDB is the database solution, I'm using to store my items. It's a NoSQL/Document database and I got a real problem on real-time updates of items.
First, the saved format is like
{
expiredTime:...
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How to update a NoSQL database and publish event atomically in an event-driven microservices architecture?
In an event-driven microservices architecture, services typically need to update their domain state and publish an integration event to a service bus at the same time (Either both operations complete, ...
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Efficiently querying for a set of objects for price comparison
I am designing a system where a user can input a budget and a query returns to them sets of objects that they can afford from different vendors. The system has 100s of different combination types (i.e ...
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Database agnostic DAO (NoSQL + SQL)
Background
While writing a new component, I m in middle of making a decision of SQL/NOSQL database (Mongo vs Mysql) for my storage layer. As of today, mysql seems to be a perfect fit for my use-case (...
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Some Suggestion about Data Modeling
I want to make a social game for Android. I am using NoSQL Based Database (MongoDB) and I am using NodeJs. I am using Android-Volley library to make POST and GET requests. But I am stucked on ...
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My team is scared of relational database entities with foreign key relationships and I don't understand why
I'm relatively fresh out of college so most of my familiarity with relational databases is from my databases course where anything not in BCNF or 3NF is a travesty. Certainly that's one end of the ...
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Some Guidance on Parent-Child Relationships in Elasticsearch
I would like some guidance in setting up my document structure Elasticsearch. The company I work for has an app that stores around 20,000 new phone records each day in a SQL database. And we feel we ...
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Most efficient way to get unique customer count
I'm working on a system that stores details of customer purchases for several stores. One statistic that they would like is to know how many unique customers they have had over a specified day range, ...
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Alternatives to RDBMS For Forecast Data
I currently capture well structured forecast data in a SQL Server. An example of this data is below:
What this tells me is that each day, I receive a forecast for the next three days. Note that in ...
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Regarding data modeling in a NoSQL use case
I am reading the following link to learn about system designs of various systems. (This is a paid link, I am attaching all explanations below.)
In an attempt to explain the system design of Instagram ...
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How to think about queries in NoSQL
I'm writing a project for school - Tinder-like app. I thought of implementing database entirely in RDBMS (PostgreSQL). But now I think it's a good opportunity to get to know NoSQL systems a bit.
I'm ...
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How to model JSON data so it can be easily de-serialized in to simple Java classes?
Context
Currently I'm struggling with correctly modeling a small instruction set I want to send as JSON to an Android application to generate a list of UI parts. Right now it's layered as pretty much ...
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