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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3nf but waste more storage space
I have a table which has three columns: account, idNumber, and position. The account and idNumber are unique.
Here is my thought to analyze and I don't know whether it is right or not.
account is ...
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32 views
Database design: Two 1 to many relationships to the same table
I have to model a situation where I have a table Chequing_Account (which contains budget, iban number and other details of the account) which has to be related to two different tables Person and ...
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When to split a large table
I run the SQL Anywhere DBMS, and we have a table of about 10 columns(normal text, timestamps etc).
However, in my use-case, every single day, the table gets 2160000 new rows.
It's also crucial that ...
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Table Design for user-specific and user-agnostic criteria
I want to design a table that is general enough to accommodate an increasing number of achievements as I come up with new accomplishments to reward. Initially, I thought to design the table as ...
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2answers
36 views
Time series data for ad platform
I am trying to figure out how to store time series data for an ad platform I am working on.
Basically I want to know some strategies/solutions for storing billions of rows of data so that I can ...
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68 views
Database table design question
Firstly, database novice here. I'm trying to create a system for processing Sales Orders into Purchase Orders and then split the Purchase Order into Shipping Containers. The systems needs to be able ...
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2answers
46 views
Recommendation for mySQL table structure (no code)
I need some advice on how to layout the tables for a mySQL database.
I will first describe what I am trying to do:
I have a table for users. (This covers basic info for now)
A user will select a ...
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1answer
49 views
When is it worth it to use Triggers and stored procedures/functions? [closed]
As an example, lets say I have a forum application and for every topic that is created, I have a trigger that fires a database function creating a post.(lets assume we have a topics table and a post ...
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4answers
31 views
Are all matching indexes (indices) searched for a query?
If I have multiple indexes that include a common attribute - will each index be searched upon a query involving this attribute? Or is only one index searched?
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Database Design: separating reusable & instance data
I'm developing an app which is basically a collection of checklists that have to be processed. I obviously need a database in which the information has to be stored. I just can't wrap my head around ...
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0answers
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Where and how to store my weird datamart
I could really use some help here.
Here's my situation.
I'm building a datamart in SQL Server 2005, which will furnish a single report (for now). We have 26 clients (medical organizations) that ...
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DB Design - Which of the two is best-Normalized or Not [closed]
Please see the analysis below and let me know the best db design (InnoDB) out of the two.
Requirement- Faster Write and Read for users not having to wait when many concurrent DB connections exists, ...
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46 views
How to share resources among accounts?
Using google doc, I am able to share my documents with others. I wonder how they implement it underlying in terms of DB design?
The simplest way I imagine is to use a joining table which keeps a ...
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1answer
32 views
One database or multiple referencing one?
Database design: one database or multiple databases, which is best?
We have a database which has about a 100 or so tables, accessed by about five different applications. Five different applications ...
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1answer
34 views
Multi-variance products
My current system houses different variants of Products in different tables;
Productgroups
Productcolors
Productsizes
Productmodels
Products can reside under 1 Productgroup and can have ...
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1answer
25 views
How to “swap” out production tables in MySql
I have a MySQL table that holds a few thousand records which go out of date very quickly. A few times a day we run a slow process which needs to pull data from multiple sources and re-populate the ...
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2answers
37 views
Using a keywords table with multiple other tables
Using MySQL
I need help determining how to model a Keywords table to three different tables (Products, Certifications, and Exams) - I have included my model which is using what I refer to as ...
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1answer
41 views
MySQL DB Design
I am designing a db for a Social Network type website where users enter lot of information varying from family member details, education, employment, personal favorite such as TV, movie, music, food, ...
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2answers
48 views
Can a surrogate key and a primary key be in the same table?
For example we have:
Surrogate key: ABC123
Primary key: 1
Name: James
Is this legit in a Data Warehouse table?
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2answers
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notes / description string in another table in a relational database
I'm primarily a non-database developer, however I am familiar with normalization techniques.
A coworker was suggesting that it is correct for a table to store 'description' and 'notes' as a foreign ...
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Fine grained (milliseconds) temporal indexes in neo4j
What are the best practices for modeling fine grained timelines in neo4j? If I were to use milliseconds as the grain in the pattern described here and here would it prove somehow problematic and ...
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0answers
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Database Design [closed]
I have a requirement like creation of database design for examination of school student.
There we have different types of exams like quarterly exam, half yearly exam and the final exam. For each class ...
3
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2answers
44 views
Table design when one data is dependant of another and the second one has repeated values
I have a products, and subproducts.
Like:
Product Identifier - Product Name - Subproduct Identifier - SubProduct Name
1 ProA 1 SubProA1
...
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Need help to design model with multiple rights
For a website, I have multiple elements that need to be moderated by many different users.
Until now, I have always used Role-Based Access Control (RBAC) model but I want a more flexible model. I ...
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1answer
31 views
How to link several tables in MySql?
I'm a newbie at Database Designing. What I want to do is perform several actions at once.
I have a main users table which holds all the data for a user at a website. Then I have a primary key as the ...
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1answer
61 views
What is the meaning of this anomaly warning message?
I have run an analysis with SchemaSpy.
The tool gave me a warning message for two tables. The warning message is:
Tables with incrementing column names, potentially indicating denormalization
...
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Do you know any data model archive website like this one? [closed]
I found this website with many data models... It's not bad actually, but just for curiosity, do you know any others site like this?
http://www.databaseanswers.org/data_models/index.htm
Thanks
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3answers
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pros/cons of different ways to store whether a record is one of two options?
I am trying to store whether an address is a Work address or a Home address. There will never be another type of address.
I'm wondering what the pros/cons are of the different ways to store this, ...
3
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1answer
27 views
How should permissions for anonymous users be modelled?
I'm designing a web application. There will be users who log into the site, but also anonymous, non-authenticated users, i.e. any member of the public who accesses the site. Users will be assigned to ...
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1answer
61 views
mysql - index optimization
I'm building a 'tag' system for my blog posts. Currently my tags table has columns tagid - MEDIUMINT NOT NULL AUTO_INCREMENT PRIMARY KEY and tag VARCHAR(30) NOT NULL UNIQUE.
And I have another table ...
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2answers
175 views
How to design this database to avoid cyclic dependency?
There are two tables:
User
Address
User contains a reference to Address.
Address contains the columns CreatedBy and ModifiedBy, which is reference to User.
How do I design this database to avoid ...
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4answers
124 views
Database design - People and Organisations
Databases are not my primary skill and I am finding I need some assistance please.
The software we are building has "Customers".
The Customer could either be a Person or an Organisation.
I really ...
3
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1answer
65 views
Many:Many with Shared Relation
I'm modelling data with multiplicity like this:
Each Composition/Anthology related pair must share a Composer. Also, each Anthology must contain at least one Composition. How would you recommend I ...
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Change URL of Erwin data model HTML export hyperlink of www.ca.com to something different
The website URL of http://www.ca.com appears in every fact group (subject area) of our Erwin file. How can we make a global change to this URL in Erwin, so we don't have to update each subject area ...
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1answer
46 views
What are the risks for logging across databases via a trigger?
I've searched for this online and had mixed or unclear responses, and after posting on superuser, was directed over here.
On SQL Server 2005, we currently log certain table changes via triggers using ...
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2answers
69 views
Database Design Confusion
I am making a Phonegap based ERP solution for school in which every school can configure their own school individually and can manage the whole school from that single application, in which a main ...
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0answers
28 views
How to handle “many columns” in OLAP RDBMS
I have a fact that has around 1K different numerical attributes (i.e. columns). I would like to store this in to a column-oriented DB and perform cube analysis on it.
I tried to design a star ...
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Types of databases [closed]
I'm curious about these databases, and I've never heard of them before. What is the answer to this question?
You store all of your photographs on a web site that uses a database to store the photos ...
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66 views
Oracle database created whats next? Create Schema or Create Tablespace?
I'm a programmer that's being thrown to the DBA/Sysadmin island all by myself with a volleyball that I named Wilson. I'm trying to survive here.
I'm supposed to create a database for an application. ...
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1answer
56 views
Table for optional parent/child relationship
Assuming we have the following table: Item, Parent, Child and Parent is the parent of child.
The item can either belong to a parent or child and not both.
I have other tables that are similar to ...
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1answer
91 views
What is the correct model for related tables with millions of rows?
I need to create a question and answer tables that will have millions (maybe billions) of rows.
The current model is:
Question Table
id_question (PK, auto increment)
id_user
question_content
...
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2answers
219 views
Is it ever a good idea to denormalize for integrity?
I'm using Postgres 9.2 to develop a quiz app, in which I present the user with a series of problems and record their answers.
These problems can take a variety of forms - they might be multiple ...
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2answers
64 views
checking number of occupied occupied neighbours [closed]
Assuming a pixel grid with x and y of the size 1000 over 1000. In each iteration\run, using a random number generator, certain cells will be marked as occupied. Those cells will be written in a SQLite ...
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1answer
26 views
Database for opening times of locations
I'm designing a database for opening times and created this solution.
The specifications of the database which will be a MySQL are, that a location have standard opening times in a week and can ...
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1answer
44 views
Defining system scope and boundary
I have been given a homework task where I am to create an ER model of a database from a set of client requirements. Another part of this task is to create a diagram that shows the scope and boundary ...
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1answer
81 views
Separating tables vs having one table
At the moment I have a table setup that looks somewhat like this:
create table tbl_locationcollections
(
id int(11) PRIMARY KEY IDENTITY, --(Primary Key),
name varchar(100) not null,
...
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0answers
30 views
Database with history journaling [closed]
In the database I need to store a data about vehicles (about 240 objects), their locations, working job, etc. In my table this info stored in one table. User should not input everyday this info. It ...
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37 views
Network Databases [closed]
I am doing some research on network database e.g. IDMS-type databases. Are there any free/open source network databases available?
TIA
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Default values for a table, how to refactor?
I've created two tables, one listing the default prices of work for a lesson of given length (minutes) and topic, individual or not individual. And the other
listing special price for "privileged" ...
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1answer
47 views
How to enforce a nullable foreign key?
I have a relation between two tables. The foreign key table can have a row related in the primary table. There's a way to enforce the value of the FK column to be NULL or one of the values of the PK ...
