Installation Guide for IBM Informix Dynamic Server for UNIX and Linux

Short Description
A private installation copies or links files from your conventional installation of the database server to a directory of your choice. The installation script creates the necessary files and directory structure that you need to run the database server in private database server mode. You do not need to be user root or informix to create or use a private installation. After you create the private installation, you own the critical resources and services such as the sysmaster database.

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Content
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Overriding Default Limits
When you run a conventional installation of the database server, oninit runs as user root and group informix. This arrangement permits the database server to override some default limits such as file-descriptor limits and memory limits. If you run a private database server installation, oninit runs as the user who invokes it and cannot override these limits itself. You might need to request that your system administrator increase these limits on your behalf.
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Setting Up Multiple Residency
Multiple residency refers to multiple database servers and their associated shared memory and disk structures coexisting on a single computer. Creating multiple independent database server environments on the same computer allows you to:
- Separate production and development environments
You can separate production and development environments to protect the production system from the unpredictable nature of the development environment.
- Isolate sensitive databases
You can isolate applications or databases that are critically important, either to increase security or to accommodate more frequent backups than most databases require.
When you use multiple residency, each database server has its own configuration file. Thus, you can create a configuration file for each database server that meets its special requirements for backups, shared-memory use, and tuning priorities.
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