This tag is for general database questions; if you question is specific to SQL use that tag instead.

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1
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1answer
106 views

Automatic denormalization for a NoSQL database application

We have a use case where we store table-like data, but we know about the schema of the data only at runtime. In our application, a power user defines a schema and normal user can create records and ...
1
vote
5answers
155 views

Database design with performance issue and use of views

I am designing database for a school system. I am having to create a lot of tables and a lot of link tables to maintain a structure in the system. I am trying to maintain foreign integrity and trying ...
1
vote
1answer
90 views

How to save appointments in database?

There are 2 entities. One is admin. The task of admin is to define slots for appointments which will be taken by applicants. The admin will choose a default time for the appointments like 10am to ...
3
votes
2answers
138 views

Whether to store all numbers or just their ranges in database for this application

I'm developing a (PHP MySQL) Web App which will sell dynamically generated real time cell phone numbers for cellular companies. A company will ask for, say, a thousand numbers and this app will check ...
0
votes
1answer
35 views

Tweaking a ranking algorithm from a few variables

I'm going to have a mySQL table with elements in it and would like to rank them in the same manner than Reddit but not quite. I'd like to know how to add or remove importance to a variable in my ...
0
votes
1answer
95 views

Efficiency of getters/setters with database performance

I'm currently in the process of refactoring a very old personal project of mine, which used procedural PHP-in-HTML code. I'm modernising it as a learning project, using OOP where beneficial. I ...
0
votes
0answers
45 views

Database conceptual Question [duplicate]

When querying in database through PHP, is it good to open mysql connection before every query and close it as the query completes? or should we open the mysql connection as soon as the first query ...
7
votes
3answers
312 views

Does it make sense to develop open source python library for database inspection? [closed]

Some time ago I came up with an idea for a library for database inspection. I started developing it and got some very basic functionality, just to check if that's possible. Recently however, I get ...
-1
votes
2answers
98 views

Loading database in memory vs querying

I am currently developing a continuous backup software. The key feature of the software is instant backup meaning that each time a file is created, modified, renamed or deleted the change is ...
0
votes
2answers
100 views

Minimal set of critical database operations [closed]

In designing the data layer code for an application, I'm trying to determine if there is a minimal set of database operations (both single and combined) that are essential for proper application ...
3
votes
6answers
470 views

How to define a natural id in database?

There are a lot of manuals. I am trying to create an database to hold information of these documents. But, there is a small problem. How can I give meaningful id to the manuals? Are there any ...
3
votes
2answers
83 views

An algorithm for finding subset matching criteria?

I recently came up with a problem which I would like to share some thoughts about with someone on this forum. This relates to finding a subset. In reality it is more complicated, but I tried to ...
2
votes
1answer
96 views

Finding a way to simplify complex queries on legacy application

I am working with an existing application built on Rails 3.1/MySql with much of the work taking place in a JavaScript interface, although the actual platforms are not tremendously relevant here, ...
2
votes
1answer
75 views

Using json as database with EF, how can I link EF and the json file during DbContext initialization?

For a personal testing-project I am considering to create a SPA with the following technologies: ASP.NET MVC + EF + WebAPI + AngularJS. The project will make use of small amount of data, so I was ...
2
votes
2answers
154 views

One codebase - lots of hosted services (similar to a basecamp style service) - planning structure

We have built a service (PHP Based) for a client, and are now looking to offer it to other clients as a hosted service. For this example, think of it like a hosted forum service, where a client signs ...
0
votes
1answer
82 views

Prepared statement alternatives for this middle-man program?

I have an program that is using a prepared statement to connect and write to a database working nicely, and now need to create a middle-man program to insert between this program and the database. ...
1
vote
1answer
100 views

Where to store front-end data for “object calculator”

I recently have completed a language library that acts as a giant filter for food items, and flows a bit like this :Products -> Recipes -> MenuItems -> Meals and finally, upon submission, ...
-2
votes
1answer
62 views

How to get a database on my filesystem that I can use in my application [closed]

I'm making a .NET application where I'll have a lot of data entries. This will not go to any server though, but needs to be stored and updated, frequently on the local machine. I would like something ...
0
votes
1answer
74 views

Dealing with data, when your database is under version control

Currently my database is not under some kind of vcs, we can get deltas but that's about it. I would like to try and make product deployments more automated, and less time consuming. I understand that ...
0
votes
1answer
178 views

What is the disadvantage of using abstract class as a database connectivity in zend framework 2 instead of service locator

If I use database by creating adapter with drivers, initialize it in some abstract class and extend that abstract class to required model. Then use simple query statement. Like this: namespace ...
0
votes
0answers
82 views

Fixing data duplication in two similar tables in different databases

I'm currently doing maintenance on an old order system that has grown into the poster child for bad coding practice. One of the tings I'm dealing with is a lot of data duplication, which I want to ...
2
votes
2answers
47 views

How to ensure the success of processes after a deadlock exception occurs?

No matter the programming language is and whatever the database is, the concept should be the same: I have 2 threads, each locking some database entities and inserting new data in database. Let's ...
3
votes
2answers
179 views

Would these two scenarios be good candidates for a NoSQL database?

I've checked a few other threads around the topic and search around, I am wondering if someone can give me a clear direction as to why should I consider NoSQL and which one (since there are quite a ...
0
votes
0answers
217 views

Best practice: Secure Android app online authentication

Currently, I develop an Android App needing online authentication for login (and registration). The main focus is on security. I’m amaing for: keeping the users’ passwords safe and preventing MITM ...
2
votes
3answers
638 views

Keep user and user profile in different tables?

I have seen in a couple of projects that developers prefer to keep essential user info in one table (email/login, password hash, screen name) and rest of the non essential user profile in another ...
2
votes
3answers
174 views

Structural pattern for an unconventional use of a database

I'm writing a game client as a personal project and using using it as a vehicle to learn about Java database access, specifically Neo4j, and possibly Spring Data Neo4j if I decide it's appropriate. ...
0
votes
3answers
378 views

PHP class data implementation

I'm studying OOP PHP and have watched two tutorials that implement user login\registration system as an example. But implementation varies. Which way will be more correct one to work with data such as ...
-4
votes
1answer
90 views

what data storage method should I use? [closed]

I am currently writing a program and among other things need to store data. The program listens to two computers talking to each other in a known protocol (the program know what protocol it is,the ...
1
vote
1answer
105 views

Entity-Attribute-Value table vs single table for storage of posts, events and pages

I am trying to decide whether to just use individual tables with more fields for storing posts, pages and events or using tables with basic fields plus having EAV tables as well for fields that are ...
1
vote
1answer
66 views

n:m as the only way to store notifications?

I have a user and a notifications table. I want to make sure that every users sees a new notification once and only once. Not more, not less. The intuitive idea is to have a n:m relation table with ...
2
votes
1answer
50 views

How do tablespaces differ in DB2 from databases in MySQL or MS SQL Server? [closed]

In DB2, it seems there is a strong separation between what a database is and what a tablespace is. Where as in MySQL and MS SQL Server tablespace and database seemed to be used synonymously. What ...
1
vote
1answer
161 views

Should data be stored to local database in Android when heavily using REST services?

Let's say I have an application that has constantly changing data. Changes are so frequent that you basically need to refresh data every time you open some screen and keep refreshing it. Is it worth ...
2
votes
4answers
82 views

In a large statically-typed software project with non-dynamic manual sql statements inside of it, how do you verify all the sql syntax?

One of the things I seem to struggle with frequently is the need to deploy a software application to test the database interaction. More often than I'd like, I have a syntax error or typo in my sql ...
10
votes
2answers
4k views

Data Synchronization in mobile apps - multiple devices, multiple users

I'm looking into building my first mobile app. One of the core features of the application is that multiple devices/users will have access to the same data -- and all of them will have CRUD rights. I ...
-1
votes
3answers
190 views

What constitutes a good Database System(Java / SQL related) [closed]

I've given this so much research but still couldn't come to my own conclusion, before continuing this question I would like to give you a rough idea of my current situation. I'm 18 years old and have ...
2
votes
3answers
115 views

Multiple many to many relations or one option table?

Let's say I have a database of persons who have some properties. For the sake of this problem let's say all of these properties relate as N-N. I can either create two tables for each property (one ...
0
votes
2answers
75 views

Static and dynamic data : should I use different databases?

Say I am building a website that uses two different types of data : Static : information that will hardly change, like movie awards or world countries names (I want fast access so no external API) ...
12
votes
3answers
1k views

General thought process for “How would you build this website/app” interview questions

I've collected a bunch of interview questions like "Describe how you would design a photo album application", "Describe how you would design this particular feature of this particular website" (e.g. ...
1
vote
1answer
97 views

Best way to deploy database-dependant application

I have always "custom developed" software for clients. This means: Develop the software Install SQL Express on client site Import DB, create DB user, set DB permissions etc. Install software on ...
3
votes
5answers
269 views

Is it useful to keep 'definition' entities in a database vs using an enum?

In a project that I have started working on, the database has a lot of FooDefinition tables which act like an enum. It's a C# project using Entity Framework although that is not central to the ...
2
votes
2answers
1k views

Database model for keeping track of likes/shares/comments on blog posts over time

My goal is to keep track of the popular posts on different blog sites based on social network activity at any given time. The goal is not to simply get the most popular now, but instead find posts ...
0
votes
2answers
269 views

Google App Engine overview

I have gone through many Google App Engine tutorials, and I became quite familiar with how to do basic stuff like implementing a webapp2.RequestHandler, and using ndb.Models to manage your data. Now, ...
3
votes
1answer
75 views

optimize human-readable database with index

i need to store a large amount of data - about 10 million entries of the format unique hash (64 chars), value 1 (5 chars), value 2 (9 chars) i will be reading and deleting (but not updating) this ...
3
votes
1answer
375 views

Good way to handle the notification counter like Facebook does

I want to build a similar notification mechanism that Facebook handles. I actually store the user's notification in an SQL table (actually it's a graph database but everybody master RDBMS terms). ...
0
votes
1answer
76 views

Multiple intranet/internet systems partially working on same data - database strategy

We are starting rewritting our apps (Internet portal, millions of unique users and few CRM/ERP systems, few hundred users) and we have a huge decision to make now. We are going to write them mostly ...
1
vote
4answers
167 views

MySQL Database design - Opinions

Im working on a web Application for our bussiness with my brother. Our application its pretty simple, will be develop with php and mysql. Clients and providers ABMs Articles Inventory (we do not ...
2
votes
1answer
130 views

How to model a one-mandatory-of-many relationship

I have following class model that I'm quite happy with: A Whole has a special mandatory Part. Furthermore it has a collection of parts, that contains at least the mandatory part, but may contain ...
1
vote
2answers
270 views

How to update a row in database without ID?

I've got a table with the following structure : Col1 | Col2 | Col3 A | B | C A | C | B E | D | C The primary key is (Col1,Col2,Col3). I get the data in another project and ...
3
votes
2answers
315 views

How are composite tables generally handled when there is no ORM tool available?

I am developing a Windows Runtime Component (C#) to be used in an HTML/JS frontend for a Windows Store App. Now, one of the requests is to have a database on the local system to store metadata about ...
1
vote
2answers
115 views

Databases and the single responsibility principle

Can the single responsibility principle be applied to databases? relational databases I mean. I'm asking this because a typical database will have several tables and we may find something like that ...