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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Digital asset management

I'm working in a company that currently develops Media Asset Management system and now we want to improve our system for document files. I have to search nearly thousand .doc and .pdf files and index ...
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189 views

What's the best practice for representing set operations in a relational database?

I have a simple database representing collections of entities and sets of those collections. Sets contain multiple collections and collections contain multiple entities. Currently, when I query all ...
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2answers
189 views

Implementation Idea for login structure (login id with two different tables)

I am creating a sample web application for a business and I am stuck at the login implementation. There is supposed to be two different users (login types?). I will have employees and customers. I ...
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2k views

Schema for an RBAC (Role-based Access Control System)

I want to implement an RBAC, Flat based. I've decided to base my system on the NIST standardization model. Although all fine and well, I have an inclusion to that design. Instead of a hierarchy ...
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2answers
446 views

Replacing composite key with surrogate

I have the following table that has a couple of million rows in it and is 99% fragmented virtually all of the time. My plan was to insert a IDENTITY field as a surrogate key to replace the current ...
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1answer
233 views

Best approach to design a database model for this situation? Clients and records

We need to store the following information for each client: Three types of record per file, for example (obviously, with real data): HDR2007022399999900000000000Soft/XX 0.0 XXX ...
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4answers
203 views

MySql Database solution for specific web app problem

Well, I need to create a comment system for posts that people add to my web app. This web app is just like facebook or myspace posts. Users add posts and people can comment on them. But the problem is ...
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249 views

How to seperate sensitive data in database(MySql) [closed]

I need to design a database that will contains information about personal disease of users. What can be the approach in order to implement the columns of the DB's tables: encrypt the information, ...
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2answers
1k views

Good book on databases for beginners [duplicate]

Possible Duplicate: Must-read Books for DBA I'm already reading a book on Introduction to SQL (RDMS). But that only teaches SQL and commands and I feel like my knowledge lacks in database ...
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323 views

Database throughful design vs Quick and dirty design comparison

Take the representation of an Address, here below is a complete and very detailed implementation: here instead is a quick implementation (which more or less contains the same fields, imagine all ...
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155 views

How to handle update or insert situations

From time to time my stored procedures looks like create procedure handle_data @fk int ,@value varchar(10) as begin if exists (select * from my_table ...
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1answer
806 views

Many To Many Relationships

I am working on a conceptual model for a database. I have the following entities: Student (id, name, date of birth, department) Subject (id, name) This is a many-to-many relationship, one student ...
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3answers
88 views

Need suggestion for placing foreign keys in the databases

I have the database for customers. The customers table is something like this +------------------+ | Customers | +------------------+ | id (PK) | | business_email | | business_name ...
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252 views

What is wrong in debunking myths about clustered indexes?

What is wrong in code. or its results, illustrating that clustered index is evil [1]? and how to de-debunk, i.e. to return to customary myths and best practices? [1] Debunking myths about ...
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1answer
313 views

Record with variable number of columns?

I am trying to model a cable mapping for devices. Each device has multiple cards, and each of those cards has multiple ports. Since both the number of cards and ports vary, I am confused on how to ...
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1answer
210 views

Do you feel like DBA/DBD Is a “secure Field” still? [closed]

I noticed recently alot of Database jobs/Development have kind been pushed onto general developers, not to mention with NoSQL Solutions (Which IMO are probably a little easier for Non-DBA's to throw ...
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2answers
173 views

To normalize or not to normalize for few distinct values

Assuming in a Postgres database, you have a table called party, which can have less than 5 well-defined party_types such as 'Person' or 'Organization'. Would you store the party_type in the party ...
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3answers
198 views

Is this good/bad database design and why?

I am building a database for a small project. I don't have much experience so I am unsure, but I get the feeling I am not approaching this correctly. I have a system which allows users to create ...
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4answers
504 views

Unsure how to implement certain constraints and relations in this relational database schema

I am in the middle of designing the dB for school project- airline ticketing database.(Using MySQL workbench) So far, I came up with the following design: Here are couple things I can't figure out: ...
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2answers
417 views

Database Design - One table from many source(One to One)

I have a 'Text' table, the text table may came from different source, like Tweet, SMS, Email, etc. and each source have their own log, and Text is came from the source. so i came with some solution, ...
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3answers
2k views

Many-to-one Subselection in single query

I have two tables with a foreign key from T1->T2, in a one-to-many relationship. That is, 1 tuple in table T1 is associated with 0..N tuples in T2. To create a simple example, lets say T1 is Cars, ...
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2answers
85 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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2answers
147 views

Messaging Database - How to handle multiple recipients

So I am trying to develop a relational database (I'm using MySQL, planning on a Java front end) where I have 3 tables (People, where I store names and relevant personal information... and Messages ...
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3answers
86 views

Which of these two methods is standard when creating a 1 to many database relationship?

If I have a customer that can have many addresses, I can create an Address table with columns Street, Town etc. and CustomerId. Then I can insert multiple records to have multiple addresses per ...
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1answer
170 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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2answers
170 views

Suggestion for storing a lot of simple data

I'm looking to crawl a lot of webpages (500,000,000,000) records and be able to store the linking structure for a later date. The way I planned on laying out the database was as follows: 2 Tables ...
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3k views

Designing a Products database: One Products table or many separated by vendor?

In order to prevent the unwieldiness of managing product data spread across a number of excel spreadsheets, I have set up a Products database. My data is in spreadsheets because it was (somewhat) ...
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330 views

Mysql error while creating FK

here is structure of both tables category table CREATE TABLE category ( `catID` bigint(20) NOT NULL AUTO_INCREMENT, `title` varchar(60) NOT NULL, `created_at` timestamp NOT NULL DEFAULT ...
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179 views

Should I create a separate database table for temporary users

I have a user table that controls access to a website. We currently have a few hundred users and this might eventually grow to a few 10,000s. We have a requirement to allow in "temporary" users. These ...
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2answers
298 views

Reporting Database Considerations

We have a very large database that we want to write almost real time. We want to take data and move it to another instance of the database on top of which will be a GUI and MI tool which will be able ...
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2answers
441 views

Designing a database tables for the following scenario

I just got following entities Employee, Client and Company. Where Employee and Client have one to many relationship with Company ie A single employee may be mapped to attend to many companies and ...
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1answer
51 views

Does a Key-Value type table still needs a auto increment key?

Suppose that I have a very simple table to store variable-like data, like this: +-----------+-----------------+ | key | value | +-----------+-----------------+ | site_url | ...
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2answers
52 views

Why WordPress use a column prefix? [closed]

I'm trying to learn some basic database design through open source projects. And look into the WordPress database schema, the posts table for example, you'll find something like this post_author ...
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3answers
195 views

Postgresql: datatype for email address

What would be the right datatype to store email addresses in PostgreSQL? I can use varchar (or even text), but I wonder if there is a more specific data type for emails.
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1answer
154 views

Precautions when designing database schema if tables are going to have billons of rows

I am about to start work on telephone dictionary kind of project. Its confirm that there are going to be billions of records in dictionary table, and each entry from this dictionary table may have ...
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1answer
1k views

Postgresql vs MySQL - Which is better for join queries & writing data(inserts) [closed]

I have to design a database which will end up with 50M records in a single table(there will be other tables with lesser number of records). I'm more concerned with join queries & writing ...
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1answer
350 views

Modeling staff dimension in data warehouse

I need to write a data warehouse diagram. I've got a problem with staff area. I have to store a information about workers details like name, age etc., and workers job time and agreement details like ...
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1answer
665 views

How to handle huge table

We have a problem with a few tables that are very very big slowing down the system. so my question is if that size is normal for the amount of rows in the table, and also what could be done to make it ...
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1answer
244 views

One address table for many types of addresses

I have an application where I have to store adresses of multiple types of location. For example, my app requires addresses of people, hotels and event venues. Should I create separate tables for ...
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1answer
190 views

Choosing the right field data type in SQL Server 2008

I got a request to create a new table that will store certain information for customers. The definition of the table is somewhat irrelevant except for one field. This field will store ANSI characters ...
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2answers
305 views

Best type to use in a composite key when one of the values varies in type

I am building a data store for the content of multiple blog sites which have been scraped. Each of these sites is going to have an entry in a Blog table BlogId Url ...
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3answers
233 views

How to convert MySQL Keyword to normal column

We thought of upgrading MySQL to new version 5.5.16. While testing the scripts with the new version, I had found one column Maxvalue is a Keyword in latest version. For this one, we need to change ...
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1answer
285 views

Where to save user data?

I hope this is the right stackexchange place to ask. Im really new using databases and I have a little question: Where to save the user data? I mean, if Im logged as "Foxandxss" on my app, and I want ...
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1answer
42 views

Unique constraint to enforce max one null per item

I am using PostgreSQL 9.3. Suppose we are manufacturing some items of certain types, at any moment we are producing at most one item of a certain type. The following table captures our history of ...
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1answer
69 views

Data modeling with many attributes where few apply to each record [closed]

I'm pretty new to data modeling, so please excuse me if I've missed something obvious. I'm trying to decide on a schema (or possibly a DBMS) to work with some data where there are quite a few possible ...
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2answers
135 views

What is the advantage of using numeric primary keys in a relational database?

Many tables in a relational database system (in my admittedly limited experience) have this sort of structure (Oracle syntax as that's what I'm used to): create table widgets ( widget_id number ...
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2answers
53 views

I don't know how to read many to many relationships

I'm reading this tutorial, and I have question about it. Look at this picture: Looking at Physical Many-to-Many Implementation I read the relationship this way: 'A user can be in zero or more ...
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1answer
110 views

Why do we not store names in a separate table?

Practically, I would never store names for customers in a separate table. But why not? It's a one to many relationship (a person can have one name but that name can be used by multiple people). ...
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3answers
128 views

One or several tables for attributes

I just spent some time discussing two alternative DB designs with a coworker and I'm not convinced. Neither of us is strictly DBA so we may be missing something. The overall goal is to create the ...
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2k 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. ...