Required Installations for Upgrading

For a safe and orderly upgrade, at least four Ingres installations are needed:

• Original version production installation
• Original version development installation
• Installation for testing the upgrade
• New version development installation for preparing and testing applications

If possible, keep the installations away from the production machine. You may temporarily need additional hardware to accommodate the required installations during the upgrade.

Possible Hardware Setups for Upgrading

Possible hardware setups are from one to four machines.

A four-machine setup can be used, with each installation on its own machine. More commonly, however, the two development installations share a machine. Because there is usually some traffic between these two installations during preparation, sharing a machine is convenient.

Note: If you are using Windows, you need a separate machine for each installation. Versions prior to Ingres 2.6 do not support multiple installations on one Windows machine.

A three-machine setup is the recommended minimum, as follows:

• Development (both old and new versions)
• Test
• Production

A two-machine setup is possible, as follows:

• Development (possibly including a test installation)
• Production

The two-machine setup is not recommended because the test installation shares a machine with development, so it will not mimic your production installation as closely. In addition, the more installations on a machine, the more chance for error.

A single machine setup is possible, but not recommended, since you may accidentally work in the wrong installation and damage production.

Note: There is no remote installation procedure for Ingres. The machine must have local media support (CD-ROM or tape); otherwise, you will have to copy the distribution files from wherever the CD-ROM or tape drive is situated.