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Designing databases
The first step in creating a relational database is to construct a data model, which is a precise, complete definition of the data you want to store. After you prepare your data model, you must implement it as a database and tables. To implement your data model, you first select a data type for each column and then you create a database and tables and populate the tables with data. You can also implement fragmentation strategies and control access to your data.
Designing and Implementing a Database
The Informix® Database Design and Implementation Guide provides information to help you design, implement, and manage your Informix databases. It includes data models that illustrate different approaches to database design and shows you how to use structured query language (SQL) to implement and manage your databases.
Managing databases
Table fragmentation strategies
Modify fragmentation strategies

Designing databases
The first step in creating a relational database is to construct a data model, which is a precise, complete definition of the data you want to store. After you prepare your data model, you must implement it as a database and tables. To implement your data model, you first select a data type for each column and then you create a database and tables and populate the tables with data. You can also implement fragmentation strategies and control access to your data.
- Designing and Implementing a Database
  The Informix® Database Design and Implementation Guide provides information to help you design, implement, and manage your Informix databases. It includes data models that illustrate different approaches to database design and shows you how to use structured query language (SQL) to implement and manage your databases.

Modify fragmentation strategies

You can make two general types of modifications to a fragmented table. The first type consists of the modifications that you can make to a nonfragmented table. Such modifications include adding a column, dropping a column, changing a column data type, and so on. For these modifications, use the ALTER TABLE statements that you would normally use on a nonfragmented table. The second type of modification consists of changes to a fragmentation strategy. This section explains how to use SQL statements to modify fragmentation strategies.

At times, you might be required to alter a fragmentation strategy after you implement fragmentation. Most frequently, you will be required to modify your fragmentation strategy when you use fragmentation with intraquery or interquery parallelization. Modifying your fragmentation strategy in these circumstances is one of several ways you can improve the performance of your database server system.