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Designing databasesThe 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 DatabaseThe 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
Database-level privileges
Connect privilegeThe least of the privilege levels is Connect, which gives a user the basic ability to query and modify tables.
Users and the public

Users and the public

Privileges are granted to single users by name or to all users under the name of PUBLIC. Any privileges granted to PUBLIC serve as default privileges.

Before executing a statement, the database server determines whether a user has the necessary privileges. The information is in the system catalog. For more information, see Privileges in the system catalog tables.

The database server looks first for privileges that are granted specifically to the requesting user. If it finds such a grant, it uses that information. It then checks to see if less restrictive privileges were granted to PUBLIC. If they were, the database server uses the less restrictive privileges. If no grant has been made to that user, the database server looks for privileges granted to PUBLIC. If it finds a relevant privilege, it uses that one.

Thus, to set a minimum level of privilege for all users, grant privileges to PUBLIC. You can override that, in specific cases, by granting higher individual privileges to users.

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