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

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-6
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0answers
21 views

Where to start: Sortable Databases and APIs [on hold]

First things first, I apologize if this is not the correct forum for me to ask this question. I like to consider myself as tech-savy; I have a general understanding of HTML, PHP, Sql, and CSS. I ...
0
votes
0answers
21 views

MS SQL DB retrieve two coloumns from one query [migrated]

I have two tables as below: Students table work table: My query is: select stud_name from students inner join work on work.library=students.stud_id where work_id=2 It returns name of ...
1
vote
2answers
85 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 ...
17
votes
6answers
7k 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 ...
0
votes
1answer
182 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. ...
3
votes
4answers
119 views

How to save many changes to database data?

I'm working on a feature which will pull many (say, 1000-5000) rows from a database, display them to the user and allow the user to edit them. This editing may involve changing text; adding rows at ...
1
vote
1answer
55 views

How do auto generated stories/news articles work?

So there seems to be a new trend of auto-generated stories, a concept which I am struggling to understand. For instance, this article seems to indicate that sports articles will henceforth be written ...
0
votes
1answer
89 views

Using XML to store and edit data records in Java

I want to use XML to store data for an assignment . In this Java assignment I'll get data from the user in form of lines in a file below INSERT INTO student(id,name,family,isMale) VALUES ...
1
vote
1answer
56 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 ...
11
votes
1answer
5k 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?
0
votes
1answer
90 views

Like structure table with Laravel and showing the most popular content at top

I am using Laravel to creating a website, my users can post questions and other users can write their comments under the post, each comment have Up vote and Down vote, and users can voting for ...
0
votes
0answers
11 views

Is Event sourcing a good fit for database sync (master-multiple-slaves)?

I'm looking for a good way to maintain in sync local sqlite databases that could be offline to a master one, for a invoice app. Then I read about EventSourcing and Log structured storage and wonder ...
1
vote
1answer
79 views

is there a cleaner / simpler way to code this? [duplicate]

I have a web app that uses ajax to filter db results. So if you have a list of 1000 widgets, that have IDs ranging from 1-1000, by typing numbers into the ID field, you can narrow your search. ...
0
votes
0answers
78 views

How to optimize the application with huge number of database requests per minute

I have to provide free demo of some service to end users in my application. Free demo could be of 30 mins, 1 hours, 5 hours etc. (predefined time) for a new user for one time only. User can also ...
0
votes
0answers
54 views

How do I return the database rows in a custom order? [migrated]

I have a data base with two columns: a number and a name. The table is as follows: Am expecting the result of select * from table where num=6 or num=3 to be : But what I get is: How do I ...
1
vote
1answer
88 views

Am I planning my database/backend correctly?

I'm an iOS developer and to be honest I'm not really looking to become a database expert right at this moment, but I do need to know how to properly plan out what I believe to be a pretty cookie ...
0
votes
1answer
91 views

How to structure programs that interact with databases? [closed]

I've just finished a book on MySQL and I'm in the infantile stages of learning to couple that with Java. I know that the technology I need to learn is called JDBC and that it essentially allows you to ...
1
vote
0answers
22 views

How to use an Address Gazatteer in an application that contains addresses [closed]

Say I had access to the post office address file (http://en.wikipedia.org/wiki/Postcode_Address_File) and wanted to cleanse about one million addresses. I am trying to think of an "algorithm" to do ...
2
votes
2answers
172 views

Communication/Updates between units of works/entity framework contexts, colliding with user changes

I'm developing a WPF application using Entity Framework for my database communication. The application has a hierarchy of tabs where each tab has a db context. Each tab allows the user to view some ...
4
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, ...
1
vote
2answers
167 views

Best approach for a server configuration data collection and reporting solution from a legacy script?

I have a project which involves collecting config data from windows servers in our (very large) server estate. My manager wants me to collect over 150 data items across all configuration areas ...
0
votes
1answer
70 views

Making a database and related operators using files and JSON in java [closed]

I'm trying to write a program that reads operations from a file. these operators look like below : CREATE TABLE student(id:integer, gpa:decimal, name:string, family:string,isMale:Boolean) INSERT ...
3
votes
2answers
255 views

implementing dynamic query handler on historical data

EDIT : Refined question to focus on the core issue Context: I have historical data about property (house) sales collected from various sources in a centralized/cloud data source (assume info ...
1
vote
1answer
22 views

Sequencing distributed tasks with a distributed DB

Background I have two separate processes, WriteIt() and ReadIt(). One creates records, and the other processes the records in a DB cluster. Once WriteIt() creates a record, it queues a ReadIt() ...
2
votes
2answers
470 views

Separation of retrieving data and business objects between DAL and BLL Layers

I did some research before posting this question. Among other questions or post, one of those is provided below. I could not get a clear mind how to determine.. Business Objects within a Data Access ...
0
votes
1answer
33 views

Planning complex Mongo (And possibly other NoSQL) Databases

There is no "right way" to do anything, but there are "better" and "worse" ways, as well as true and tested ways. I'm studying Mongo and considering it for a project. It's gonna start small but ...
0
votes
0answers
20 views

Is Python Logging in a WSGI application a best practice a production environment?

I am trying to log my webpage access to a database. It is a requirement. It seems to be a difficult thing to do outside of Windows IIS, and I do not wish to use Python with IIS. My options seem to ...
2
votes
4answers
175 views

why do people do REST API's instead of DBAL's?

At the past two companies I've been at REST API's exist for querying data via a web app. ie. instead of having the web app do SQL directly it calls a REST API and that does the SQL and returns the ...
2
votes
1answer
96 views

Which approach would be better for persisting these overridable configuration keys and values? A simple key-value store, or a graph database?

I'm creating a system where there are config keys and values. So for example: config.key = 10 Is an example of a configuration key and a value. These keys can also have overrides based on ...
2
votes
1answer
97 views

Integration testing and database connection string in app.config

I am working on a project where SqlConnection is created via a static method, lets say it's DatabaseAccess.GetSqlConnection(). This method reads the .config file to get the connection string and ...
1
vote
1answer
226 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 ...
2
votes
1answer
321 views

How should I handle database failures in a web application? [duplicate]

I'm developing a simple RESTful API using Go's Goji framework (although this question is language-agnostic), in which parameters from the URL are queried against a PostgreSQL database. Here's how it ...
2
votes
1answer
142 views

Entity Framework Code First Centralized database deployment

I originally posted this on stack overflow but was told that here is a better place to ask this kinda stuff. I couldn't find any other similar answered question but if there is one please give me a ...
51
votes
8answers
29k 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 ...
0
votes
1answer
39 views

Recurring database migration

I'm importing data from older website to new one using database migrations. I have created first as one of first steps of development phase of new site. Then I planned to create another one, that will ...
0
votes
0answers
53 views

Abstracting the data in a relational database. [duplicate]

While working with data, which is in a relational database I came up with this issue. At first, I was just writing helper functions to retrieve A SPECIFIC data I needed for the current problem but it ...
0
votes
2answers
113 views

Getting to know my way around a database with hundreds of tables [duplicate]

I'm new to a small company that's pretty much run by one guy. He knows all the ins and outs of the system which is quite large. We have a database with about 300 different tables. I'm struggling to ...
4
votes
3answers
142 views

Algorithm that generates a group of men and women who are each interested in everyone from the other gender

In my dating app, I need to compile lists of men and women where all of the men in the list are potentially interested in all of the women in the list, and vice versa. That is, in a list of 10 men ...
1
vote
1answer
58 views

How to minimize database deadlocks in a load balanced web application?

I'm working on a web application hosted on multiple load-balanced web front ends (WFEs). This application has an API method that performs a database query and returns the results. This query only ...
0
votes
1answer
34 views

Tags DB structure - tags table using one join and GROUP BY, or pivot (join) table using two joins?

I'm implementing tags into my question and answer application. Users will be limited to the tags available by the app, so they can't choose their own. So maybe only 30-50 tags will be available. This ...
12
votes
5answers
1k views

How come the computer doesn't have to read the entire table when the column is indexed? [duplicate]

Let's say a table with two columns has 100 quadrillion records. And I want to find a record that has column #2 equal something. If column #2 is indexed it returns the result immediately, but if it's ...
0
votes
2answers
104 views

Definition of the NHibernate Mapping by Code / EF Code First pattern?

Sub-questions: Does this pattern have a formal definition? Who invented it? Is it considered a DSL? The reason why I am asking is because I would like to better assess its applicability to ...
0
votes
0answers
59 views

What is the design pattern name for a class that handles 2nd level caching? [duplicate]

I have a system where I want to start introducing some 2nd level caching. I want to abstract data access a bit and allow some type of other class to do the dirty work of fetching a DTO; it will check ...
15
votes
3answers
8k 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 ...
24
votes
8answers
5k views

Front end first or Back end first. Of the two which is a Good system design pratice?

I have a client right now requiring me to develop a school enrollment system. Now this is the first time im having this kind of challenge. Most of the past software that i created are not that ...
1
vote
0answers
49 views

How to off load DB & API calls (PHP Heroku App) [closed]

I took over support for a PHP app that runs on Heroku. After analyzing the performance with New Relic, I'm noticing that the three bottles necks are the database and API calls to outside services. ...
2
votes
1answer
93 views

Strategies for handling or avoiding race conditions

I'm working on a .NET application where I off-load my DB work (save operations) to a separate thread (inspired by how NodeJS handles IO operations). A save operation comes down to this (using Entity ...
6
votes
7answers
282 views

How would you design a user database with custom fields

This question is around how should I design a database, it can be relational / nosql databases, depending on what will be the better solution Given a requirement where you'll need to create a ...
5
votes
4answers
248 views

Two Database Architecture : Operational and Historical

I thought about an uncommon database structure and wonder if anyone has seen it in use before. It's basically using 2 databases: First database hold only the data that is currently valid Second ...
0
votes
0answers
38 views

Hybrid Apps and Storage - how does it work with Native apps and which to use?

I'm using Ionic at the moment. I believe, like many others, that hybrid apps will become more more common/important than they are now simply because the frameworks are getting better and better. ...