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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
Grant and limit access to your database
Grant privileges
Table-level privileges
Privileges on table fragments

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.

Privileges on table fragments

Use the GRANT FRAGMENT statement to grant insert, update, and delete privileges on individual fragments of a fragmented table. The GRANT FRAGMENT statement is valid only for tables that are fragmented with expression-based distribution schemes.

Suppose you create a customer table that is fragmented by expression into three fragments, which are located in the dbspaces dbsp1, dbsp2, and dbsp3. The following statement shows how to grant insert privileges on the first two fragments only (dbsp1 and dbsp2) to users jones, reed, and mathews.

GRANT FRAGMENT INSERT ON customer (dbsp1, dbsp2)
   TO jones, reed, mathews

To grant privileges on all fragments of a table, use the GRANT statement or the GRANT FRAGMENT statement.

For information about the GRANT FRAGMENT and REVOKE FRAGMENT statements, see the Informix® Guide to SQL: Syntax.