To install a CQ instance, you need the following:

	Note
	The JRE is no longer bundled with CQ WCM as it was in versions prior to CQ 5. You can obtain JRE 1.5 or higher from the Sun web site

CQ system architecture is described in detail in the CQ5 Architect Guide, which includes the underlying technologies such as Sling.

The following figure shows a high-level overview of how the various Day products and modules interact:

Figure 1. CQ5 Overview

The following figure shows the underlying technologies:

Figure 2. CQ5 Technology Stack

For detailed CQ5 architecture information, see the CQ5 Architect Guide.

If you use a database persistence manager to store the CQ data in an external database (that is, a database on a server that runs independently from CQ), you need to set up the database before installing CQ. By default, CQ 5 WCM uses the tar persistence manager. If you need to configure a database persistence manager, see Custom Installation.