Tagged Questions

-2
votes
0answers
35 views

working with Neo4j and MySQL together [closed]

I'm starting a project which will include data and connections between entities. I thought to use Neo4J for storing the data and the connections but I'm not sure about it and want to consult with you. ...
1
vote
2answers
93 views

Implementing search over large data set, PHP or Mysql stored procedure?

I'm building an Online Food Ordering System with PHP and MYSQL, One of the feature of the application is to allow users to search for the restaurants by typing the area name. I would like to know ...
1
vote
1answer
171 views

Which practice is the best for database connection? (PHP, etc)

Leave a open database connection throughout the execution of the aplication, or for each time a operation will be executed a new connection will be created? Open throughout the execution: Open ...
92
votes
12answers
30k 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 ...
-1
votes
1answer
333 views

How to develop a login/register system for Android? [closed]

How would it be possible to develop a login/register system for Android? I have 0 experience with Android or general network programming but I do have a server running MySQL and anything else I may ...
-1
votes
1answer
93 views

Which database choose for my case? [closed]

I'm starting develop a new web application with PHP. This app will store GPS data from vehicles to trace their path. It's a monitoring tool. I'm predicting a large growth of data on it's database. ...
3
votes
5answers
229 views

Senior team members want to move query-relevant persistent data from DB to cache. Does this make sense?

I am a young engineer recently employed at a small company that sells products to the general public. We use Ruby On Rails and MySQL. Our database has a lot of customer data, but a great deal more of ...
2
votes
1answer
213 views

DB Schema for packaging products / services together under a single pric / Offer

I'm trying to 'conceive' the business logic of this website that have many activities, that the users can build their "combo" and get discounts depending on their choices and how long they are willing ...
2
votes
3answers
746 views

How to handle monetary values in PHP and MySql?

I've inherited a huge pile of legacy code written in PHP on top of a MySQL database. The thing I noticed is that the application uses doubles for storage and manipulation of data. Now I came across ...
0
votes
1answer
275 views

What schema documentation tools exist for PostgreSQL [closed]

MySQL has MySQL Workbench for designing and documenting your schema, and generates CREATE and ALTER scripts based on your design. We're looking at migrating to PostgreSQL in the near future, and we ...
1
vote
1answer
176 views

Sharing a database while we work on local copies?

A friend and me are working on a webapp. We're using git so each of us has a local copy of the app. But the problem is the database. We want to be able to see the latest changes the other person made. ...
1
vote
3answers
169 views

Help with DB Structure, vOD site

I have a video on demand style site that hosts series of videos under different modules. However with the way I have designed the database it is proving to be very slow. I have asked this question ...
6
votes
2answers
764 views

Making the switch from MySQL to PostgreSQL?

I've spent the last year becoming really comfortable with MySQL, but due to its increasing trendiness and my desire to homogenize my web-apps with Heroku, I'd like to start using PostgreSQL for my web ...
6
votes
3answers
183 views

What's the difference between the insert methods and why one is faster

I have insert 14.485 lines on MySQL like this: INSERT INTO `bairros` (`id`,`cidade_id`,`descricao`) VALUES (1,8891,'VILA PELICIARI'); INSERT INTO `bairros` (`id`,`cidade_id`,`descricao`) VALUES ...
5
votes
6answers
2k views

Is there any reason to use varchar over text columns in a database?

Is varchar just a remnant from before text came around, or are there use cases where you would want to use a varchar? (Or char for that matter..) (I use Postgres and MySQL (MyISAM) daily, so those ...
0
votes
2answers
124 views

How should I handle using two databases with a legacy PHP application?

I have a legacy PHP application that was written in 2004 and uses MSSQL as a database backend. At this stage MSSQL is still supported by PHP but only just via a Microsoft driver. I have looked at ...
38
votes
12answers
10k 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 ...
1
vote
1answer
220 views

choosing Database and Its Design for Rails

I am having a difficulty in deciding the database & its structure. Let us say the problem is like this. For my product I have various customers( each is an educational institute) Each customer ...
1
vote
1answer
150 views

Data base structure of a subscriber list

I am building a application that allow different user to store the subscriber information To store the subscriber information , the user first create a list For each list, there is a ListID. ...
1
vote
2answers
304 views

MySQL with mutiple threads and processes

I'm developing a telecom messaging platform in C, and I'm going to need multiple processes to be working with MySQL DB. How can I make two processes read/write to/from a Mysql DB and, if/when one of ...
2
votes
7answers
1k views

What is the best approach for database design with lots of columns?

I am writing a query based financial application. It lets the user to write complicated equations (much like WHERE part of an SQL query) and find companies matching those criteria. For the above, I ...
7
votes
5answers
4k views

Is MongoDB the right choice in my case?

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 ...
2
votes
1answer
155 views

How to swap out a DB from MySQL to SQL Server in a multiple large projects?

Is there a sane way / best practices way to swap out a DB from MySQL to SQL Server in a multiple large projects? Some of the projects are ASP projects, some of them are windows services, some are ...
7
votes
5answers
790 views

Is MySQL viable for small-medium business applications

After having worked with a Microsoft stack - VB.Net, ASP.Net, SQL Server - for the past 10 years, we are now faced with having to develop an application for both Windows and Mac environments. It has ...
3
votes
1answer
214 views

Technique for multiple users on same datasets

This is more a learning question than coding, but I'm certain it's a common issue for anyone developing administration systems or applications in php/mysql/js etc. I've developed quite a complex ...
0
votes
2answers
396 views

How to store personal information properly?

It's not about security or something. There is a table to record user information, like username, password, postcode and so on, one record per person. There is also a table called post to record the ...
1
vote
2answers
300 views

Database design

I'm on the way developing an application which requires a kind of dynamic database, So this is what I want, This is the for reading the details of a class, the number of variables and methods ...
5
votes
2answers
1k views

What's the difference between MariaDB and MySQL?

What's the difference between MariaDB and MySQL? I'm not very familiar with both. I'm primarily a front end developer for the most part. Are they syntactically similar? Where do these two query ...
2
votes
5answers
510 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 ...
6
votes
2answers
314 views

How should I organize the words of a sentence for better outputs/maintenance and performance?

Having this sentence (consider many sentences in the future) David Henderson Houston patented the first roll film for cameras in 1881. I can make questions like 1. Who patented the roll film? ...
5
votes
3answers
632 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 ...
1
vote
3answers
416 views

Rails data model - best practices question

I'm writing a Rails cookbook app as a learning exercise. I've created a table for Recipes which holds info for the recipe (name, author, etc...). I also have a table for Ingredients which will be a ...
1
vote
2answers
217 views

best practice when working with a MySQL database datadir directory

At the place I currently work they do some thing I consider strange in the way they work with the MySQL datadir. The directory in which the files that actually store the data are kept. $ grep ...
9
votes
1answer
711 views

What is the difference between collation and character set?

I have a general question about databases. We usually use the term collation with databases. I would like to know how its different from character set. I guess collation is a subset of character set. ...
1
vote
2answers
275 views

Is it more efficient to query once for all settings, or query whenever a setting is needed?

For my blog script I have a usergroup and permission system set up. Each user is assigned to a usergroup and I have a long list of permission settings. Both are stored in a MySQL database. At the ...
1
vote
2answers
337 views

what is storing data in constant space?

"bloom filter allows us to store data in constant space" Can someone explain what exactly does that sentence means?
2
votes
6answers
950 views

what is the benefit of using key/value stores with respect to database sharding?

What has key/value stores got to do with making database sharding easier? Because if I do not use a key/value store, I can easily shard my database too right? (Like say, I can easily say users with ...
2
votes
4answers
508 views

Advice on making sure e-commerce site is secure using PHP and MySQL

Like the title says, I would like some advice from knowledgable web developers on figuring out security issues for my e-commerce site. I am designing the database as well as the code that ...
2
votes
1answer
1k views

How does Facebook calculate mutual friends?

How does Facebook calculate mutual friends? Does it cache all mutual friends for each user? Does it use MySQL to calculate mutual friends with a query?
3
votes
9answers
4k views

Is there a large bank using Mysql or PostgreSQL? [closed]

I always thought the largest scale of banks use Oracle. However, there is no proof they really use Oracle instead of Mysql or PostgreSQL, nobody knows the secret. Any idea what they really use? Can ...
3
votes
7answers
3k views

Best practices to follow with database indexes [closed]

What are some DOs and DONTs for improving database performance using index? A DO would be a case in which an index should be created, or another indexes related tip that will improve performance. A ...
6
votes
9answers
2k views

Foreign key restrictions -> yes or no?

I would like to hear some”real life experience” suggestions if foreign key restrictions are good or bad thing to enforce in DB. I would kindly ask students/beginners to refrain from jumping and ...