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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.
Basics of database design and implementation
Plan a database
Use ANSI-compliant databases
Differences between ANSI-compliant and non-ANSI-compliant databases
Transaction logging

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.

Transaction logging

ANSI-compliant databases run with unbuffered transaction logging. In an ANSI-compliant database, you cannot change the logging mode to buffered logging, and you cannot turn logging off.

Databases of that are not ANSI-compliant can run with either buffered logging or unbuffered logging. Unbuffered logging provides more comprehensive data recovery, but buffered logging provides better performance.

For more information, see the description of the CREATE DATABASE statement in the Informix® Guide to SQL: Syntax.