Database design is the process of specifying the logical and/or physical parts of a database. The goal of database design is to make a representation of some "universe of discourse" - the types of facts, business rules and other requirements that the database is intended to model.

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41 views

Promo Codes - should I create a separate table or add a code column to a join table for Students and Courses

I'm creating a promo code and invitation system and I want to understand the best way to structure the database to include the Promo Codes. This is what I have currently: User: has_many Courses ...
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49 views

Is there a way to check which views have data? Oracle 11g

I'm undergoing a cleanup process for a data mart design. However, I want to get rid of any views (in the design) which result in having 1 or less rows of data. Instead of manually going through ...
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1answer
56 views

Modeling Optional Foreign Key from Composite Primary Key field (Oracle Data Modeler)

I am trying to add an optional foreign key in Oracle SQL Developer Data Modeler v4.1.0.873(Build 873), as per diagram below: The issue is that I can only make such a relationship if it is mandatory ...
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1answer
83 views

(MySQL) user table and profile separate, or same table?

I'm creating a blogging site that anyone can sign up and be an author for. I want each author to have their own public profile. My main question is; would it be better practice to have a separate ...
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220 views

Facing Failed to read stream error - mysql_native_password error

I have been facing the following error intermittently on MySQL. Authentication to host '127.0.0.1' for user 'root' using method 'mysql_native_password' failed with message: Reading from the ...
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17 views

App with ETL like operations - pull back small sets or one large set?

The problem Have an application that needs to provide back a result set from a normalized database into a single result sheet that is highly normalized for processing changes in excel. Must be ...
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0answers
109 views

Advice designing a stock management database

I am developing a webapp for my business, a mobile phone repair shop. The problem I have is I don't know how exactly to implement a way to manage the parts inventory. Here what i have now: ...
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1answer
43 views

how many tables do i need to create in MYSQL [closed]

can anyone tell me or help me with this please how many tables would i need to create in MYSQL?
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2answers
173 views

No suitable driver found Orientdb jdbc driver

I have some problems with Orientdb driver for jdbc. i´m using Netbeans, i have include the library JDBC+OrientDB libraries (orientdb-jdbc-2.0.8-all.jar) in the directory and in netbeans, i have also ...
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1answer
56 views

Having four different tables or having one table with one more field?

I have a website with 4 translation (That is Arabic with 4 different Persian translation), and I had exported each of these translations to different tables. Which one of these ways are faster and ...
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1answer
48 views

How to design a main list and sublists schema

I am finding it difficult to design a database schema for a list feature. there would be a master list which then can be subsectioned into further lists. each user is able to mark a candidate as a ...
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1answer
51 views

Find the functional dependencies that hold in a relation

There is a question in my book that asks the following: Suppose we have relation R ( A ,B ,C ,D ,E ) , with some set of FD’s, and we wish to project those FD’s onto relation S(A, B, C). Give the ...
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1answer
43 views

how big of a role does hardware play? [closed]

I'm the developer, not the DBA. I don't know much about setting up databases but i'm concern of the setup at my current work. The server is installed on desktop PC hardware(i7, 16GB RAM, 1 TB SATA ...
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0answers
15 views

Does splitting to multiple databases has performance impact? [duplicate]

I am scaling an old application which was designed to have ten databases. These databases are related to each other. The database is SQL Server 2008. The databases combined size is less than a GB. I ...
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2answers
66 views

Do valid to/from columns on a fact table make sense?

I recently came across "valid from" and "valid to" columns on a fact table. Obviously this is common for dimensions but I've not seen them on fact tables before and can't find any info suggesting ...
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0answers
36 views

Challenged with modeling a big DB

I'm tasked to develop a gaming web application system with relatively large database - it should hold the data about 300 million players, the orders/payment of each player - ~3B records - , and other ...
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1answer
109 views

Table with more than 100 columns

I have a table in my MySQL database which contains data about XRF analyses. There are about 50 chemical elements and for each element there are two values to be stored (Area and Count). Users need ...
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0answers
32 views

How should deal with Game Database

I am new in Game development, and want to develop Playing Card game in android but i have no idea that how manage game database for different user (which are connected through Facebook) and their data ...
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1answer
51 views

How could I improve my DB design?

I'm a second year software engineering major looking to create an iOS app that connects to a MySQL database (database not yet created) over the summer. I have a strong understanding of programming and ...
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1answer
31 views

improve database design for monitoring application

I need assistance with my DB design, I have a monitoring script that produce the following data every minute , and produce stats about virtual machine performance. Array ( [timestamp] => ...
2
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0answers
45 views

Improving performance of a weighted search query in SQLite3

For an intra-site search I have this table in an SQLite3 database, that relates ids to search terms with a certain weight: CREATE TABLE search_index ( id INTEGER(7) REFERENCES other_table, ...
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1answer
121 views

Database Design For Social Network apps

I'm going to build a social network app. Each user will have photos, videos, details, posts etc. My question is when a new user registers, should I generate many new tables for that user or have one ...
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38 views

Couchbase data modeling

I come from the Relational DB world (SQL), and I'm getting started with NoSQL. So please consider that when answering. I have two Buckets: Apps and Users. A user may be subscribed to N ...
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1answer
49 views

How to store user defined scoring formulas?

First post, so apologize if I have not chosen the best spot for it: If I had table of values, let's say corresponding to a question number and its corresponding answer, what is the correct way to ...
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53 views

Why can't we have multiple cascade paths?

You can see that many questions have being asked about multiple cascade paths. For example: http://stackoverflow.com/questions/851625/foreign-key-constraint-may-cause-cycles-or-multiple-cascade-paths ...
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1answer
19 views

Handling of Topic Drill Downs in Databases

I have a requirement wherein I have to set up a drill down feature. For example: There is a tab in a shopping website "Men". Now if we click on Men we will get more topics like "Clothing", ...
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1answer
35 views

1 to N relationship on a product shop database design

imagine this scenario: I want to run a database that keeps track of all the purchases that every customer makes. So i'll have a purchases table along a customers table and a prodcuts table. The thing ...
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1answer
25 views

Inbound Outbound Shipping Database

should we combine both inbound and outbound shipping into a single table (then create an additional column to identify the direction) or to split them into separate table? What's the pros and cons?
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1answer
247 views

Understanding a notification system

I have been looking into how to build a notification system on SE and elsewhere and found myself drawn to the solution that is the accepted answer here: ...
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1answer
90 views

Bicycle Sharing Scheme - ER Diagram

Please compare the directions below to my ER Diagram and tell me if anything is wrong with my ER Diagram Please I think its accurate enough. Oxford City Council is preparing to launch an innovative ...
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2answers
46 views

Is following way is right Database model for following problem?

I am new to the database design so I have to check my data model is correct way to handle the problem or not. Problem Statement: I am designing the database for student portal which have following ...
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0answers
42 views

Storing table history - is this a good use case for Postgres's table partitioning / inheritance?

I currently have a products table which stores product information (title, description, tags, manufacturer, etc.) for a website. I would like to store historical information of changes to this table ...
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0answers
33 views

Most efficient way to store a large, changing number of properties

I have an entity with a large number of boolean properties. It currently has ~100 properties It will periodically get new properties The number of properties will grow to 400+ There will be ...
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1answer
82 views

best design for my data storage

I am looking for advice on storing rows of data. What I have a bunch of users (id), and data about their activities. Each user can perform a type of activity (type_id). And then about 20 columns ...
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1answer
29 views

Issue with forming correct relationship between subtype and another table in ERD

The focus is on the Cashier table and the Cash Accountability table. The rule is that only Cashiers have Cash Accountability and a Cashier ideally only cashes out once per day. Before I changed the ER ...
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1answer
34 views

Lab test database modeling help

I have a database design problem which I need some help with. I am developing a database to store some engineering lab test results. But the main problem I am running into is that each Test is ...
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2answers
186 views

Many columns vs few tables - performance wise

Yes, I am aware that data normalization should be my priority (as it is). I've got a table with 65 columns storing vehicle data with columns: used_vehicle, color, doors, mileage, price and so forth, ...
2
votes
1answer
31 views

Design for m-to-n relation with unidirectional attribute(s)

Assume I have a Table StackBox that holds items as Item. I allow StackBox to have multiple Item and I allow Item to be in different StackBox. It is obviously an m-to-n relation. Solving this with an ...
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2answers
138 views

Normalization of library book table with multiple authors

I have a database structure with two tables: The first one is called Author, has two columns (AuthID, AuthName) and its Primary Key is (PK_AuthID). The second one is called Book and has three ...
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2answers
47 views

professional services (consultants) resource allocation system

I am developing a resource allocation system using PHP and mysql. I have consultants and projects and I need to allocate the consultants on to various projects for various periods of time on various ...
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2answers
51 views

Organize repeating timestamped values in schema

I am creating models to hold some financial data. The information frequently is split into timestamped values, e.g: Some value, now | as of Jan 1st | as of Jun 1st | as of Sep 1st There are ...
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1answer
64 views

Database Design / ER Diagram - Help Needed

Please take a look at this ER Diagram that I started. I just don't know if I've set it up correctly (I have not made any relationships yet). I just want to know if I have the appropriate "Tables" or ...
2
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1answer
160 views

Rich text: VARCHAR, TEXT or BLOB in MySQL

Question: In my web application (php/MySQL) I will be saving rich text. This may be anything from a couple words to several pages length essay. I’m sure I could get away with using VARCHAR, TEXT or ...
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1answer
64 views

Database design: Is there a much better way on this current relationships?

I have a facultyand studenttable to store each information, respectively. I made a contacttable to store the contacts of either faculty or student. I would like to use the contact table as a generic ...
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0answers
27 views

A design pattern for category features [closed]

I work for a system which has these tables: products , categories , features User wants to add some feature like color dynamically. Which of this following ways are true? First one: Product ...
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1answer
62 views

Switching from Oracle database to Ubuntu [closed]

I need support please. I am the CEO of a Life Assurance company. We are currently building our own core application under the leadership of my Head of ISD. We are using Oracle for our database and ...
1
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1answer
63 views

Database design/structure for address details [closed]

I am trying to design database. I have one problem related to addresses. The will be different types which will have addresses, for example Companies, Persons. I am not sure how to design my database. ...
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0answers
68 views

Most effective way to manage a growing list of time series data in an MS Access database

I am building a database to store time series data along with some other summary statistics. Since this is a local application I do not have access to more robust database solutions and am confined to ...
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1answer
47 views

ER Diagram - View Intergration/Centralised approach

Could anyone enlighten me on the difference between a view integration and centralised approach when designing a database, and how the ER diagram can be used to illustrate upon this; can't seem to ...
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3answers
62 views

Schema Design with “Seasonal” Data

I am developing a SaaS web application for School Management. What I need help is this: The whole application is purposed for the current year that the School is in. However, some data and ...