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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1answer
21 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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0answers
32 views

How much space does database takes to store twitter data? [closed]

Context I am going to collect twitter-data(user,s followers, timestamp, content, url and Hashtags) weekly and it continues for an year. I have a total of 160 hash-tags, and I will be creating an ...
0
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1answer
40 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
60 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 ...
0
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1answer
45 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. ...
0
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3answers
79 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 ...
1
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1answer
20 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 ...
-3
votes
1answer
181 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 ...
0
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3answers
74 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 ...
0
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1answer
58 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 ...
0
votes
3answers
49 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 ...
1
vote
1answer
46 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
38 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 ...
0
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1answer
10 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 ...
1
vote
1answer
209 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 ...
1
vote
2answers
185 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
14 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 ...
1
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2answers
36 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 ...
1
vote
2answers
97 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 ...
0
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0answers
48 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. ...
0
votes
2answers
47 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 ...
1
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0answers
91 views

How to handle many columns / variable schema?

I apologize in advance in case this question has been asked already. I'm working on revamping a reporting application used within my company. The requirements are: Support addition of new fields ...
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0answers
28 views

Is there a database system specialized in versioning documents/records?

I'm trying to find the "best" database for my application, which involves: Large (or is it?) amount of data (~15GB of text data) Documents organized in hierarchies (up to ~5 levels of nesting) ...
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0answers
41 views

How to manage MySQL database with Oracle Fusion Middleware?

Is it possible to connect and manage a MySQL database with Oracle Fusion Middleware?
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2answers
127 views

Database design suggestions for a data scraping/warehouse application?

I'm looking into the database design for a data warehouse kind of project which involves a large number of inserts daily. The data archives will be further used to generate reports. I will have a ...
0
votes
1answer
28 views

Optional oneToOne relations and criteria field

Introduction: Visitors can fill reports on my website. Those report can either be filled by a legalPerson or a naturalPerson. Constraint: I don't like empty fields and I would like to normalize as ...
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0answers
91 views

Conceptual model vs Logical model vs Physical model

I'm doing a work about database, and now I need to show three different images, one image with the conceptual model, other with logical model and other with physical model of a database. I'm looking ...
3
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4answers
190 views

Are we a good fit for SQL Server Enterprise and table partitioning?

We currently have a production database that contains millions of records (14 million in the largest table). One function of the database is to provide time sheet information so a single table could ...
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2answers
73 views

Repair Corrupt Access Database File [closed]

I am using MS Access 2010 and one of my databases on our shared network does not open for any user. Shows "Unrecognized Database Format." error message. I can't even get it to the point of opening. Is ...
0
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0answers
35 views

employees Evaluation System database

I am new to database designing I want to design an Employees Evaluation System for a company. Based on Competencies Rating Each Manager will rate his/her employees at the end of each year for 6 ...
0
votes
1answer
88 views

SQL or NoSQL for structured clinical data [closed]

I'm designing a database for a primary health center, the idea We basically have a Patient with many Encounters, also the Encounters have to be entered from different Users (Health Professionals). ...
1
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1answer
153 views

CRM Address table and it relation

Hi I want to ask about I have this DBD for my CRM I am trying to have the addresss in one table(customer and Employee Address) and both customerID and Employee ID are guid I have in address table FK ...
1
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1answer
35 views

Understanding how relationship sides works

So, I have this relations on my tables (see image) and I need to understand some things. I'll enumerate what I understand and what I need from yours is to say if I'm right or not and in case I'm not ...
0
votes
4answers
300 views

Database/Storage engine suggestion for a project involving heavy inserts?

I am looking into a project which involves large number of inserts daily.I will have a list of user's (for example a user set of 500k ) , for which I need to monitor daily certain activities ...
0
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1answer
76 views

Creating and designing Air Trafic Control System [closed]

I'm having a class about Database management system, and the prof. gave us a project regarding Air traffic controller system, exact question is "Design and create a system which can manage ...
1
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1answer
118 views

Way to run SQLCMD without storing password in text format

Is there a way to run sqlcmd from a batch file where I don't want to store the password in plain text format. I have done some research and found the system variables method(store password in system ...
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0answers
1k views

Mariadb new features vs PostgreSQL? [closed]

Mariadb 10 offer lot of new features. ( https://mariadb.com/products/mariadb/mariadb-vs-mysql) . I want to know, with these new features, will PostgreSQL would be a better solution for newly starting ...
0
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2answers
84 views

Train Fare Database Normalisation

I have a database to normalize. The database has details of train ticket fares. The trains have different fares depending on the distance and I have to store these fares in the database It is not an ...
0
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1answer
39 views

What table should I host data linking two objects from separate tables?

I've tried searching around, but I'm not too sure how to correctly formulate this question, and found nothing. Could be a duplicate. What is the best way (most efficient way) to host data that will ...
2
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0answers
40 views

Database for temporary data with 2^20 variables [closed]

I'm building a site to display graphs based on a data set with 1024^2 different variables (columns, traditionally) per point (record). That is to say, the points are in 1048576-space. The data is ...
1
vote
1answer
72 views

Get data from Berkeley DB with Java [closed]

I have a basic Java program which can list data from Berkeley DB database. The question is how I can list the database scheme to see what object are available? Unfortunately I don't have information ...
1
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0answers
22 views

What is the best type of database for numerous multi-threaded access? [closed]

I am developing a simulation and have limited experience working with databases (very limited SQLite3 exposure). Here is my task: Server that stores a potentially large database (no size requirement ...
0
votes
1answer
760 views

Storing multidimensional array in MongoDB

I am attempting to convert a large MySQL database of product information (dimensions, specifications, etc) to MongoDB for flexibility and to move away from the restriction of a column based table. I ...
3
votes
1answer
141 views

Optimum design / structure for product data database?

What would be the optimum design/structure for product data database, where each product have many variations and many attributes? Attribute sets vary between products, and some attributes have values ...
0
votes
1answer
453 views

Database design for mobile app

At first I would like to say hello to all of you, since it is my first post here on DB Administrators. I am writing an app which store drinks and their data. At the beginning it was storing all in ...
1
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0answers
257 views

How to generate data for News Feed efficiently like facebook , googleplus , twitter e.t.c?

I have created table as post ( post_id int(15) auto_increment primary key , user_id int(11) , post_text varchar(2000) , post_type int(1), ...
1
vote
1answer
78 views

What is the advantages of using auto_increment in database as primary key over set of attributes?

I have table as CREATE TABLE circle ( circle_id int(11) auto_increment primary key not null, user_id int (11) not null, title varchar(255) collate utf8_general_ci not null ); CREATE ...
0
votes
1answer
89 views

What is the strategy of query evaluation in DBMS when Limit is used in query?

I have following tables in database post(post_id , user_id , post_text , parsed_text) ; Comment(comment_id , post_id , user_id , comment_text) ; friend(id , user_id , friend_id ) ; group (id , ...
1
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4answers
180 views

Mass data upload from Excel - technology

I am a Developer seeking help in terms of DB technology for a specific requirement. I have done some research but can not conclude with list. Requirement: There will be a web application which will ...
2
votes
2answers
93 views

Is there a simple, safe and low cost way to implement a (limited) database to be outside (close) IT control? [closed]

This question is a spin off of the discussion here (What are the risks of building a database outside IT control?). Background: I'm a risk guy that builds little betas, mostly in Excel-VBA. I have a ...