For questions about structuring the data within a database. How to lay out tables, whether to use a relational DB or not, etc.

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0answers
22 views

What are some ways I can increase redis set operation performance?

I have sets of the ids for individuals keyed by each state people/stateName:VA = {1,2,3,4,5,6} people/stateName:TX = {7,8,9,10,11} ... and I have sets of the ids for individuals who are part of ...
2
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1answer
61 views

Use of tenant_id in multi-tenant database

We are building a SASS web application where every company will be using its own database schema. Using postgresql, there is a table 'companies' in the public schema that holds the name of the company ...
0
votes
1answer
119 views

Best way to structure many-to-one allocation of users to projects in NoSQL

I apologise if this is a bit of a stupid or broad question, but I'd like some general feedback please! Say I have this DB structure for users (in Mongo/JS, but really it's all pseudocode- and the IDs ...
2
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2answers
130 views

How does I/O work for large graph databases?

I should preface this by saying that I'm mostly a front end web developer, trained as a musician, but over the past few years I've been getting more and more into computer science. So one idea I have ...
2
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3answers
53 views

Table design for holidays

I'm creating a system to store holidays and events. I have a basic understanding of the schema for the static dates (every 23rd of march for instance). My trouble lies with the relative dates (i.e. ...
3
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1answer
318 views

Is this database design good? What JPA Entities should I create for this design?

I am trying my hands on JPA. For this I am thinking of using the example of a student admission process as shown in the diagram below. Is this design good ? Any suggestions for improvement are ...
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3answers
98 views

DB Schema design : single table with more columns vs multiple tables with fewer colomns

What would be better DB design for a social network website. A single table with more columns and less rows or multiple table with fewer columns but more rows. For example: User can post an update on ...
0
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1answer
175 views

Laravel relationships and database schema

I am playing around with Laravel and came across something in the documentation for defining 1 to 1 relationships between tables that I would like to get feedback on. The example in the docs is ...
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0answers
26 views

Backend solution for fetching and transforming data from various third-party APIs [closed]

We are building new feature sets for one of our financial application. We have our own SQL server database and we will be calling multiple RESTful APIs that return JSON responses. For e.g. some ...
1
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3answers
72 views

Using auto-increment clustered key and guid primary key together

My boss is the db administrator in a new software project and he came up with that design where every table will have both a auto-increment clustered key and a guid primary key (or possibly composite ...
-2
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1answer
26 views

How to design task assignment system?

I want to design a system which is similar with stackoverflow review feature. That is to say: There are n tasks, which should assign to users (users count is unknown). At one time, one task should ...
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2answers
130 views

Why should I use lookup tables at all?

This question confirmed, what I was already aware of -- instead of directly storing strings in table, I should rather use integers or enums and join them with lookup table, to get, as a result, ...
2
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3answers
112 views

At which point using string-based enums can become a real problem?

This is a direct follower to this question. An answer given to that questions says (my understanding), that nowadays using string-based enums instead of integers isn't a much problem, because hosting ...
1
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3answers
99 views

Performing data operations that involve separate applications and data sources

I'm designing an enterprise application that produces output based on some input data from another application. In this case, I happen to have also built and thus do control the source application ...
2
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1answer
69 views

An approach to multilingual db design

My boss is planning on a new db and wants to support multilingual data in this manner: LocalizedDescs (Guid / LanguageGuid being the primary key) Cluster Guid LanguageGuid Desc ProductCategories ...
1
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0answers
32 views

Adding fields a good use case for EAV? [duplicate]

Is being able to add fields quickly to a system a good use case for EAV? What would be the frequency or number that would justify using an EAV model?
1
vote
1answer
90 views

CMS with unknown data structure [closed]

I am looking to build a sports small application, but I would like to build it so other people/organizations could use it as is. These would be separate apps, not one app that caters for all. For ...
0
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1answer
27 views

Generation of ids in offline/online application

I'm a bit confused about how to identify the elements in my application. I have a rest backend with an sql database. I'm currently using numeric (autoincrement) ids as primary key and use these for ...
0
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1answer
26 views

Storing Multi-select and Single-select data together

I've got a database with some multi-select fields. To keep it simple, let's just say those fields are MatchGender and Interests. I want users to be able to find people who match (hence Gender is a ...
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2answers
34 views

Groups relationships - Detailed or Direct?

Current design I have a Person model: PersonId Name ----------- ---------------- 1 Jessica 2 Jennifer Then I have a ShareModel which have the ...
1
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1answer
75 views

Proper tree NoSQL structure with focus on full-text searching

I developing an app with tree(folder-file) structure, on which I should perform full-text searches with MongoDB. I did a research on the best tree structure practices and found this great article, but ...
1
vote
2answers
193 views

NoSQL or MySQL? [closed]

I'm developing an app that requires to save data that is not consistent across all rows. These database entries represent different kind of sport activities. Let's take an example: In football the ...
1
vote
1answer
63 views

how best structure localization of content type category name

I'm working on swift / iOS with a parse.com backend but this question could be applied to any language and is a general conceptual question. I'll use a specific example for illustration purpose. I ...
0
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1answer
55 views

How to handle rating? [closed]

I want to implement like/dislike system, but I don't know how to achieve best performance. I have to tables: blog posts and comments that need rating. Should I store all data in one rating table? Or ...
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2answers
125 views

One Enum vs Multiple Enums

I am developing an application where a user submits a mission and other users accept the mission. Pretty simple. I want to keep a track of the mission progress status and store it into a database. ...
0
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1answer
28 views

Database design for linking parent & child relationship

Currently i have requirement saying user from an UI creates there own forms which has types textbox,choicegroup etc.. Does anyone have a any idea on how to architect the database to store all data? ...
1
vote
1answer
61 views

SQL - Designing a Threshold value table

I need to design an SQL table to be used for "threshold" or special values, which in general would have the following properties: - key - value - comparer (less than and greater than as a start, ...
2
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2answers
82 views

Is normalization all that's needed to ensure data integrity and quality reporting?

I've gotten out into the real world recently, and for the first time have had to really think about database design, as I've been developing across the entire Java stack. With that I've realized that ...
4
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1answer
114 views

How to store data that is recorded with different frequency?

I'm writing a metallurgical web application, that must store data (electrical parameters) recorded at different frequencies. For example: six parameters recorded with frequency of one measure per ...
0
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0answers
21 views

Cascading ACL and drill-down data architecture

I want to implement a drill-down data architecture based on the data and the ACL permissions of a user. Lets say we have data of employees of an organization and lets consider the hierarchy as ...
4
votes
4answers
223 views

Two possible solutions to a problem, DB design

I saw the recent post about the person questioning his boss's solution (I believe my solution is better than my boss, so should I ignore him?) and decided to ask something similar but not as ...
11
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2answers
471 views

Why store flags/enums in a database as strings instead of integers?

I've been browsing SQL dumps of some famous CMSes, including Drupal 7, Wordpress (some quite very old version), and some custom application based on Python. All of these dumps contained data with ...
7
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3answers
1k views

How to separate sensitive data in database(MySql)

I need to design a database that will contains information about personal disease of users. What can be the approach in order to implement the columns of the DB's tables: encrypt the information, ...
5
votes
2answers
316 views

Hard Coded File Paths - Solution?

Say you have an application that saves image(.jpg, .png etc) and text(.txt, .xml) files, and the application has all of the files paths hard coded throughout code, per the example below. Assuming the ...
0
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1answer
65 views

How to represent a Model with a 1:N relation?

I have a task to associate 1:N documents to a record in my hardware table. This file could be a warranty, or whatever. In SQLServer I set up a FileStream group and made a table for only the file and ...
0
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2answers
229 views

Dealing with several custom getters

I have a data structure with data units containing different types of data. I've wrapped the data in "Field" objects so that each field is able to independently parse user input in a desired way. ...
1
vote
1answer
101 views

Is there a valid symbol for “two or more” with Crow's Foot notation?

I have a database design for which one entity of Class A always has at least two entities of Class B. Can I express this with valid Crow's Foot notation? One possible idea I had was this: Excuse ...
1
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3answers
193 views

Are there any good reasons to use ER Diagrams instead of UML Class Diagrams for data modeling? Is ERD the COBOL of data modeling?

Are there any good reasons to use ER Diagrams instead of UML Class Diagrams for data modeling, given the fact that class diagrams subsume ER diagrams? Or is it just for historical reasons because ...
11
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5answers
412 views

Version controlling a database's contents

I'm working on a web project that involves user-editable content, and I'd like to be able to do version-tracking of the actual content, which lives in a database. Basically, I want to implement ...
1
vote
1answer
130 views

ER Diagram Multiplicity (UML)

Schema: #=PK Employee (#NIN, fName, lName, address, DOB, sex, salary, taxCode, deptNo) Department (#deptNo, deptName, managerNIN, businessAreaNo, regionNo) Project (#projNo, projName, contractPrice, ...
3
votes
1answer
41 views

Architecting a SaaS for backwards-compatibility in regards to data and business logic

I have a SaaS platform where the user fills out a form and data entered into the form is saved to a database. The form UI has a large amount of config (originates from the DB but ends up in ...
23
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6answers
1k views

Does the advent of the SSD have any implication for database optimization?

Today I was browsing through a book on SQL Server optimization and it seemed that a certain amount of the ideas were based on a linear model of storage. As SSDs have a completely different storage ...
1
vote
2answers
102 views

How can you predict the time it will take for two processes in two different machines in a cluster to communicate?

I am trying to develop a computing application which needs a lot of memory (>500gb). Buying a single machine for that is overly expensive. I can, though, buy ~100 small instances on Digital Ocean or ...
4
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1answer
230 views

What is a buffered write scheme?

I received this response from Jeff while researching hit counters. He said page hits are incremented in a buffered write scheme, and that a views table does not exist. Can you explain what a buffered ...
0
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0answers
42 views

MySQL Database normalization for a user model

I currently have a MySQL Relational Database with a users table with the following attributes: ID (Primary key) Name Username (Unique) Password Email (Unique) Description Profile Picture File Path ...
0
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3answers
179 views

Representing category splits in a personal finance database

I'm working on developing a personal finance applications (e.g. Quicken/Mint.com/etc..). I plan to store the data in a SQLite database. I'm stuck trying to determine how I want to represent splits in ...
47
votes
7answers
5k views

How can I argue convincingly against duplicating database columns?

I've started working at a new organization and one of the patterns I've been seeing in the database is duplicating fields to make writing queries easier for the business analysts. We're using Django ...
1
vote
2answers
137 views

Database Design for Inventory

I am starting to design a typical product based MySQL database but I keep running in circles on how to design the tables. I have many types of products Jeans Tshirts Dresses Which have many of ...
19
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6answers
8k views

Should I use one database per application or share a single database amongst multiple applications [closed]

I have multiple applications some that use data from the same sources. Is it best practice (or what are the pros/cons) to: leave the data in databases shared by multiple applications saves space ...
10
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4answers
9k views

Multi-tenancy - single database vs multiple database

We have a number of clients, whose systems share some functionality, but also have quite a degree of diversity. The number of clients is growing - always a healthy thing! - and the diversity between ...