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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
Create a fragmented table
Create a fragmented table from nonfragmented tables

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.
  - Basics of database design and implementation
  - Managing databases
    - Table fragmentation strategies
      - What is fragmentation?
      - Distribution schemes for table fragmentation
      - Create a fragmented table
        Create a new fragmented table
        To create a fragmented table, use the FRAGMENT BY clause of the CREATE TABLE statement.
        Create a fragmented table from nonfragmented tables
        More than one nonfragmented table
        Use a single nonfragmented table
        Rowids in a fragmented table
        Fragment smart large objects
      - Modify fragmentation strategies
      - Grant and revoke privileges on fragments
    - Grant and limit access to your database
    - Distributed queries
  - Object-relational databases

Create a fragmented table from nonfragmented tables

You might be required to convert nonfragmented tables into fragmented tables in the following circumstances:

You have an application-implemented version of table fragmentation.
You will probably want to convert several small tables into one large fragmented table. The following section tells you how to proceed when this is the case. Follow the instructions in the section More than one nonfragmented table.
You have an existing large table that you want to fragment.
Follow the instructions in the section Use a single nonfragmented table.

Remember: Before you perform the conversion, you must set up an appropriate number of dbspaces to contain the newly created fragmented tables.