Determining what database product best fits the requirements and limitations in a specific situation. This is advice that generally requires much more insight into requirements than can easily be gleaned on a Q&A forum such as StackExchange.

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6 views

Putting some calculations on a database entry from phpmyadmin

I am creating an online store website for sale/purchase. I have to put a specific percentage of an amount (User enters) in database. for example If user enters 100. I have to deduct 30% of it and I ...
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2answers
14 views

Structure database(s) dealing with different time points

I have few data sets that give a score for a specific account at a specific point in time. So, account A might have a different score each quarter going back 5 years so. There aren't a ton of data ...
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2answers
26 views

How to build a table for a private messaging system that supports replies?

I'm writing a private messaging web application in PHP, the application allows replies such that when you view a message, you also get to see to what was that a reply to, and to what was that a reply ...
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1answer
43 views

Difference beetween mysql 5.5 and 5.6

I have a big performance problem beetwen my local mysql instance and the server. I have this request : DELETE a FROM a LEFT OUTER JOIN ( SELECT MAX(id) as id, `v_id`, `v_statut`, `c_controle`, ...
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1answer
38 views

Need help on a database model design

I am creating a small booking application with Laravel. It lists some centers. Each center has its own unique rooms. Each room may be booked several times (with dates). From my application, I post the ...
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1answer
19 views

Drill Down Functionality for Data Entry in Database

I am building a database that houses financial statement data. Within the database and to maintain the relational model and data integrity the fields are standardized. However, I do not want to lose ...
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2answers
38 views

ElasticSearch: is this problem suitable for ElasticSearch DB? [closed]

I have some hardware instruments each one recording a signal and generating sequences of timestamp/value pairs. Timestamp is a basic UTC posix time and value is a double. I'd like to record such ...
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1answer
25 views

What is the ideal backend for global apps? [closed]

Should our tiny team use Parse or firebase or other backend solution for a global instagram-like app we are developing ? Speed of development is very key.
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1answer
151 views

Which databases can meet these replication requirements?

I am doing research on database architectures for a large project, and I am looking for which software can meet my requirements. To try to explain the requirements simply: You have a master ...
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2answers
58 views

DBA Tasks ( SQL Server 2008 ) - Recommendation - Maintenance plan

I'm a JR DBA on a big company. I was hired 6 months ago, and I'm learning things really fast (I'm the only DBA here). The old DBA left servers and SQL Server instances for me, to take care of it. ...
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1answer
94 views

Mirror / replicate only 1 table of a database

I need a good way to replicate a single table in SQL Server 2012 between different servers and different databases. I tried replica which works just fine, but there might be a much better / easier way ...
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2answers
57 views

Best database for a real time application [closed]

I am a student doing my Final Year Project where I need to build an android application for on the road navigation. The problem is the application has a feature that alerts the user of nearby incoming ...
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0answers
14 views

Should I partition table by time or project_id, or both?

I have a table of event data that is getting slightly large. It's ~10 million records. I want to partition the table to help speed things up. I almost always restrict the query by both the time and ...
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18 views

reset password database and table

While working on lost password feature on a website, I have created two tables tbl_lost `id`(PK) | `umail` (FK) | `pcode` | `count` | `expired_on`| `asked_on` | tbl_user `id`(PK) | email | ...
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4answers
522 views

shrink after archiving, is this that bad too?

I have a database which grow to 20 GB, after archiving some data, the real size of tables is just 5GB. Backup script does save a copy of the backup to a different location. Moving 20GB or 5Gb does ...
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0answers
28 views

Data containing list of all the domain names. MongoDB or MySQL?

Data containing list of all the domain names (currently present in the Internet world), along with few attributes (5-6 or maybe 10, each attribute being a column) will be considered as Big Data? ...
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0answers
17 views

Recommend a suitable DB for storing events

I have rows of the following type: identifier (string), type (int), date (date), count (int), extra info Rows have a unique constraint on (identifier, type, date). I want to perform the following ...
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0answers
36 views

What kind of data cannot be stored economically in a database / data-warehouse?

Someone mentioned this in a presentation but didn't provide any examples. This stuck with me and I am trying to figure out what kind of data couldn't be stored economically in datbases ever since. It ...
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41 views

linking a single table (comment) to multiple tables (article,link,attachment)?

the main idea is that i can post an article , link or an attachment and i can receive comments on each of these types of posts (the structure of the comment is the same) , the problem here is that i ...
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3answers
41 views

Which databases support encryption [closed]

I'm searching for a database that can run on Windows and can be accessed with C#. The Database also requires that the data can be encrypted (ideally without backdoors). Can MariaDB serve here?
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1answer
59 views

Database migration for Large Data Set from MySQL to NoSQL

I have an existing APP that has N types of products that is normalized with MySQL. Each types of products have over 500K skus, and one of them are in the in 2M currently. We are currently tracking on ...
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1answer
68 views

What is the best design for storing courses subscription data?

Building an app that will manage lessons, students, courses. Each lesson belongs to a certain course. A student can subscribe to a single lesson or to a whole course. So it seems straightforward that ...
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2answers
58 views

Database design for attendance feature

My app has a requirement wherin we need to capture attendance details of a class. A class typically has 50-60 students and there will be records with attendance/absense status of each student for a ...
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0answers
19 views

Retrieving log files from users and dumping into a web based database

Please forgive me for not being familiar with database tools. I am trying to figure out even the best jumping off point for my senior project. Basically I've designed a front end application in ...
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1answer
63 views

What's the best database if i want save data temporally? [closed]

I want to create a datalog system so I need to store some int data temporally. What would be the best database (Relational, NO-SQL or some specific) for that purpose? And what would be the best way to ...
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22 views

Platform to manage and analyze peer evaluations?

Our academic department (at a US university) collects mandatory paper-based peer evaluations at undergraduate level for a number of classes each semester. So in a typical class of 60 students, folks ...
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0answers
74 views

postgresql 9.3 with Ubuntu 14.04.1 LTS throw 's ERROR: invalid page in block 105 of relation base/16385/17407

This is Ubuntu 14.04.1 LTS with postgresql 9.3 in production, Now i got this below error's in log. # tail -f /var/log/postgresql/postgresql-9.3-main.log 2015-01-08 14:10:16 IST CONTEXT: automatic ...
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0answers
20 views

Should I install hadoop on a single node

I just bought a desktop computer with 16GB RAM and 1TB drive, i7-quad core. I will be partitioning off 800GB for Ubuntu so I can do some data science type tasks. Is there any advantage to installing ...
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0answers
39 views

TPC-DS data generation

Is there a way to generate TPC-DS/TPC-H data using Normal Distribution, i.e., is there a way to specify the distribution type while generating TPC-DS/TPC-H? EDIT : I believe there is an option for ...
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2answers
47 views

Separate login for user / administrators using mongodb

I have 2 separate groups of users on my website. One is user and the other one is admin. Currently I put them in 2 different collections user and admin and login respectively. My questions is: ...
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1answer
31 views

tables relationships in database

Just a basic question here but it's been bothering me for a while. Do all tables have to be related to another? I'm trying to design a database so far I have 15 tables, 13 of them have relationships ...
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1answer
47 views

How can I quantify the business value of normalization?

My company is developing an internal application with a SQL server database which was started earlier by another developer. Now I am Looking at the model,the developer has stopped at 1NF. I proposed ...
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2answers
93 views

Creating tables with inheritance

I'm fairly new to SQL. I just wanted to create a database from scratch to learn. So I have a table called Addresses and I want to create two tables dependent on it that are Country and State, Im not ...
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1answer
468 views

Can I copy a collection in mongoDB from one database to another by copying the db files directly?

I tried using cloneCollection http://docs.mongodb.org/manual/reference/command/cloneCollection/ , but clonecollection takes a lot of time in case of big collection because it starts indexing the data. ...
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3answers
98 views

Database Design for Paper Submission System

I am learner of Database design, I want to design a database for a journal paper submission system in which one paper can be submitted by one or more author. I have initially two tables Author and ...
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1answer
29 views

Does InnoDB Log Files take RAM space or Disk Space

When I set InnoDB Log File size to 512M, does it take the space (512M * 2) from RAM or the SSD Disk space? When I explored, I can see that the log files are located inside /var/lib/mysql folder. So ...
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1answer
1k views

What are the advantages and disadvantages of Firebase for a database?

I am currently developing a site to track credits gained from exams, and how these stack up against the user's goal credits. I am looking for a database system that will store all the possible exams ...
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3answers
91 views

Confused about Primary Keys, and Foreign Keys

Im brand new to database design and, I'm slightly confused about Primary Keys, and Foreign Keys and my database design. Context: I'm working on a database of museums and Categories will be one way ...
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1answer
75 views

Copy database from one mysql sever to another mysql server

Following are the details of the database and server: Server1: Host Name: abc Port Num: 01 database: test Server2: Host Name: xyz Port Num 02 database: spareparts userid: spts password: abcdefgh@123 ...
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3answers
131 views

Converting huge ASCII file to flat and convert

I am not a db administrator but I thought to ask this question here. I have several very large ASCII files (3-5GB each) that I need to extract the data and then sort it. The instructions say to ...
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1answer
137 views

Saas MySQL Multiple Databases or One Database [closed]

I am using MYSQL so Database is the Schema, sorry if not using right terminology. I currently have a Saas product which has multiple databases one for each client with a main databases which we ...
1
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1answer
42 views

Database setup for datalogging

We're currently starting to build a version 2 of our system and one of the things we've noticed with version 1 is that we'll have quite a bit of data so we started to rethink our approach to how to ...
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1answer
13 views

Debate on which id to use as reference when quering a one to many table

I have a database that has a One to Many relationship. A few changes are in order and now when I query the output I need to provide just one ID field. The output contains all iterations of the one to ...
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1answer
996 views

Small startup: Cassandra + Hadoop or ElasticSearch

To give some context, I am from a small start up (4 team members) and we work in the education space. We've developed an e-learning platform that several schools are already using. We currently have ...
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2answers
197 views

Relational Model vs. Database Products [closed]

The formal Relational Model (logical level) for databases is not exactly the same thing as you get with MySQL, Oracle or other major products / implementations of ‘relational’ database management ...
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0answers
17 views

Database Engine Tuning Advisor - is number of queries important or not

By number i don't mean number of unique signature queries I mean raw number For example i have this query select name from my table where id=3 It is a single unique signature Having it only 1 ...
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2answers
41 views

DB for storing simple time-stamped values

I don't have that much experience in databases but I need to accomplish this as best as I can. It is rather specific. Database will contain only data structured like this: dataID-timestamp-value ...
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2answers
130 views

How to architect an analytical BI platform? [closed]

I am working on a new BI project for a medium sized corporation. Right now there is no Analytical infrastructure in place and the reporting is done manually in Excel. There are a few different data ...
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0answers
52 views

Database that supports fast prefix matching

I have a list of potentially millions of url's, e.g. twitter.com/user1, facebook.com/user2. For every incoming other url (10K/s) I want to find the longest prefix match among all the stored url's. ...
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2answers
51 views

What database should I use? [closed]

I am writing a log analysis program in bash. As part of it, I am compiling a list of known errors, so that I can search and reference those errors as part of the known list. I originally was going to ...