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

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12
votes
4answers
1k views

Staying OO and Testable while working with a database

What are some OOP strategies for working with a database but keeping things unit testable? Say I have a User class and my production environment works against MySQL. I see a couple possible ...
12
votes
3answers
3k views

what are the best tips for storing images in a database?

Is it appropriate to store the image files in the database? Or it would be better to store only the path of the file in the database, while keeping the file itself on the server? Are there any other ...
80
votes
8answers
54k views

When would someone use MongoDB (or similar) over a Relational DBMS?

Im a bit confused......the whole NoSQL and such. When would you choose to use something like MongoDB over something like Oracle or MYSQL? I dont really understand....the "difference" as far as usage ...
21
votes
5answers
3k views

Databases and Unit/Integration Testing

I have had a discussion with someone about unit/integration testing with web applications and I have a disagreement about 1 core idea. The issues is that the person I am talking to think that the ...
18
votes
5answers
12k views

What is the difference between all-static-methods and applying a singleton pattern? [duplicate]

I am making a database to store information about the users of my website (I am using stuts2 and hence Java EE technology). For the database I'll be making a DBManager. Should I apply singleton ...
50
votes
2answers
46k views

Creating database connections - Do it once or for each query?

At the moment I create a database connection when my web page is first loaded. I then process the page and run any queries against that conection. Is this the best way to do it or should I be creating ...
138
votes
13answers
77k views

Why use a database instead of just saving your data to disk?

Instead of a database I just serialize my data to JSON, saving and loading it to disk when necessary. All the data management is made on the program itself, which is faster AND easier than using SQL ...
90
votes
10answers
25k views

Why is “Select * from table” considered bad practice

Yesterday I was discussing with a "hobby" programmer (I myself am a professional programmer). We came across some of his work, and he said he always queries all columns in his database (even on/in ...
28
votes
4answers
11k views

Achieving Zero Downtime Deployment

I am trying to achieve zero downtime deployments so I can deploy less during off hours and more during "slower" hours - or anytime, in theory. My current setup, somewhat simplified: Web Server A ...
10
votes
12answers
38k views

Using XML as data storage [closed]

I was thinking about the XML format and the following quote: “XML is not a database. It was never meant to be a database. It is never going to be a database. Relational databases are proven ...
18
votes
7answers
2k views

Safely fixing production database data

Bugs happen and sometimes data has to be fixed in production. What is the safest way to go about this from a big company standpoint? Are there tools that can help? Here are some considerations driving ...
10
votes
2answers
2k views

How do you handle database change deployments?

We have been discussing database deployment techniques today, having had a couple of recent failures in our current process and having seen situations where we would like to roll back a deployment but ...
12
votes
2answers
7k views

Why NoSQL over SQL? [duplicate]

Possible Duplicate: When would someone use MongoDB (or similar) over traditional RDMS? How well the SQL and NoSQL go head-to-head. I read somewhere that SQL databases are not well for data ...
12
votes
5answers
3k views

Indexing a database

I am not so familiar with databases and now I am trying to understand the indexing mechanism. From what I know, in a RDBMS, indexing on a column makes searching by that column faster. This is also ...
8
votes
5answers
3k views

How to decide between storage formats and what are example use cases for some of them?

We have different ways to store program data (save files in games, employee databases, program configuration etc.): Plain text (think .ini and .conf) XML Databases (MySQL, SQLite...) .zip and ...
43
votes
14answers
7k views

Is there any reason not to go directly from client-side Javascript to a database?

Possible Duplicate: Writing Web “server less” applications So, let's say I'm going to build a Stack Exchange clone and I decide to use something like CouchDB as my backend store. If I use ...
48
votes
13answers
6k views

Is it necessary to create a database with as few tables as possible

Should we create a database structure with a minimum number of tables? Should it be designed in a way that everything stays in one place or is it okay to have more tables? Will it in anyway affect ...
22
votes
6answers
13k 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 ...
6
votes
3answers
591 views

How do I determine which language/framework is best for our web-based project?

I'm in the early stages of development for a web application that has three developers (myself included) working on it. The project is, at its core, a web-based database that will be used by around ...
9
votes
3answers
3k views

Unit testing vs Integration Testing [duplicate]

What is the difference between unit testing and integration testing when it come to web development (where 90-95% of the code relies on a database)? One thing I here all the time is that unit testing ...
7
votes
1answer
2k views

Log to file or to database table?

I'm developing a web application which uses MS SQL for various data: including users, user accounts, user licenses, license prices, invoices. I need to log users' real-time usage of the system, and ...
4
votes
5answers
1k views

Good techniques to speed up database execution

I have an ASP.Net application that is using a MySQL database. My queries are not executing as fast as I would like them too. Are there some standard ways to increase the speed of a MySQL database ...
4
votes
8answers
1k views

How do you decide between putting the code in the database or putting the code in the application? [closed]

For the sake of argument: Let's assume the application we are building is an amortization schedule. Let's also assume that the database has a table called tblAmortizationPayments that stores the ...
5
votes
4answers
1k views

How to add image support to client-server database application?

I have an architectural question about a project that I am working on. Currently it is a simple .NET C# application that runs on several client machines, and communicates with a central MySQL server ...
86
votes
12answers
90k views

Is it a bad practice to store large files (10 MB) in a database? [closed]

I am currently creating a web application that allows users to store and share files, 1 MB - 10 MB in size. It seems to me that storing the files in a database will significantly slow down ...
46
votes
6answers
15k views

How much business logic should the database implement?

I've worked in some projects where most of the business logic was implemented on the database (mostly through stored procedures). On the other side, I've heard from some fellow programmers that this ...
38
votes
1answer
14k views

How is localStorage different from indexedDB?

localStorage and indexedDB are used for offline storage of data in HTML5. What are their key differences and which one is preferable in what situations?
18
votes
3answers
7k views

Should I use a config file or database for storing business rules?

I have recently been reading The Pragmatic Programmer which states that: Details mess up our pristine code—especially if they change frequently. Every time we have to go in and change the code to ...
16
votes
3answers
10k views

Is there a list of common usernames to reserve in a new system?

I need to reserve usernames in my new website. These generally fall into three categories 1) usernames no-one should have (eg: admin, user, service, help, root, etc) 2) names of super famous people ...
12
votes
3answers
2k views

How to create better OO code in a relational database driven application where the database is poorly designed

I am writing a Java web application that consists mainly of a bunch of similar pages in which every page has several tables and a filter that applies to those tables. The data on these tables comes ...
10
votes
4answers
3k views

How to prevent race conditions in a web application?

Consider an e-commerce site, where Alice and Bob are both editing the product listings. Alice is improving descriptions, while Bob is updating prices. They start editing the Acme Wonder Widget at the ...
10
votes
4answers
4k views

Weaknesses with different types of NoSQL databases

Here's my question: What are the weaknesses with different types of NoSQL databases? Specifically, what're the weaknesses of key-value stores, graph data stores and document stores? I've had an easy ...
8
votes
6answers
9k views

Is MongoDB the right choice in my case? [closed]

I'm going to build my first real project in Rails that consist in a web app made of 3 main parts: The static part where no database is used The User registration part which will require a database ...
6
votes
4answers
2k views

When is it necessary to use ORM tools? [closed]

I was raised in a part of web developmentland where the creation of websites is mostly synonymous with Wordpress, FTP, Joomla, and procedural code, instead of things like TDD, A/B testing, Doctrine, ...
9
votes
9answers
4k views

How much database access should developers have? [closed]

So I've worked in many different workplaces as a developer and my level of access to the database has been varied. I typically don't have production db access. Most of the time I have access to the ...
17
votes
4answers
496 views

Database abstraction — is it being overdone?

After being exposed to numerous database abstraction layers, I'm starting to wonder what the point is of every library inventing their own different paradigm to access data. Picking up a new DAL feels ...
13
votes
6answers
40k views

what do database programmers do?

Every time I read about Oracle programmers etc, I get confused. I don't know what exactly they do. From my understanding, application programmers need to develop the core functionality. The libraries ...
13
votes
7answers
2k views

Why shouldn't you develop on production database? [duplicate]

I need help with organizing my arguments for why it's MADNESS to develop against production data. Backstory: I started working here six months ago and I noticed we're developing directly against ...
9
votes
8answers
507 views

Refactoring or upgrading databases to handle new features

Several responses to a database schema question, suggested an additional table to normalize a database for a feature that is not part of the current requirements (A UserDepartment table to allow for a ...
7
votes
3answers
1k views

How to manage database schema changes in open source project releases

I manage an open source PHP/MySQL web application used by a few K-12 schools and some colleges. I'm also the project's only developer. While it used to be little more than a source download of an ...
0
votes
3answers
600 views

database migration: upgrade schema deployed on client machines

I'm working on an application, which when deployed is installed locally on client machines, and uses a local database server. Stupidly, I didn't plan for schema changes -- and now it needs to change. ...
5
votes
3answers
352 views

Establishing an API to provide end-user apps/scripts access to multiple types of databases

Question and Context I am currently working on a project where the main question is, how do we insert an API between the database and end-users who may develop applications/scripts of their own that ...
4
votes
3answers
414 views

OOP and relational databases [duplicate]

I see a lot of talk in the OOP world about principles and laws such as Open/Close and Loose Coupling, I can understand how they are so high valued, However I seem to have ran into a problem with ...
4
votes
2answers
4k 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 ...
3
votes
2answers
292 views

Implementing set of processes in a stored procedure or through the code?

I want to know what's the suitable method to implement the following case (best practice). If i make a set of processes like this: select data from set of DB tables. loop on the selected result. ...
2
votes
3answers
194 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 ...
0
votes
1answer
1k views

Inserting data to database from Android

I have to build an application where the requirement is that my clients will send data from their Android device and I have to save that data to a database. I have done the part of coding that ...
40
votes
8answers
36k views

Create my own database system [closed]

I need to learn how databases work in order to use them more efficiently, and my way of learning is by doing. I want to create my own database system. I am not referring to creating a pseudo-database ...
51
votes
12answers
4k views

Database source control

Should database files(scripts etc.) be on source control? If so, what is the best method to keep it and update it there? Is there even a need for database files to be on source control since we can ...
42
votes
6answers
2k views

Business logic: Database vs code [duplicate]

I'm a student of systems engineering, and all my teachers and friends (that actually work in the area) say that it is better to have as much logic as possible implemented in the database (queries, ...