Minimal and Distributed TREX Systems 

Minimal TREX System (Single-Host Installation)

A minimal system consists of one TREX instance (one installation of the server software). You can use a minimal system as a demo, test, and production system.

For a production system, SAP recommends that you install the server software on a single host that is used exclusively for TREX.

If TREX is running on the same host as other components, you must make sure of the following:

■       There is enough main memory for all components.

■       TREX can use the required main memory space exclusively.

Sizing

The required hardware for the server software depends on the following factors:

●      How many documents of what type are to be indexed?

●      What quantities of documents are to be indexed initially, and what quantities during routine operation?

●      How many search queries are expected? How many parallel search queries are expected?

Plan the required number of hosts and the equipping thereof with your SAP hardware partner. Use the information in Hardware and Software Requirements as a basis for this.

Distributed TREX System (Multiple Host Installation)

Search and Classification (TREX) consists of a client component and a server component. The server component is based on a flexible architecture that allows a distributed installation. You can use a distributed installation to achieve the following:

●      Load balancing

You can distribute the search and indexing load among several hosts.

●      High availability

You can make sure that both indexing and searching are highly available.

Your TREX system can quickly reach its performance limit if you install TREX on a single server in a productive scenario with large document sets and a large number of search queries. SAP therefore recommends that you calculate the expected load and availability requirements for your TREX system early on in the planning process and start with a distributed TREX installation immediately if that is what you require.

In a distributed scenario, the same TREX version and patch level must run on all TREX hosts. Mixed installations with different TREX versions are not supported.

For more information on installing and configuring a distributed TREX system, see the SAP NetWeaver Distributed Search and Classification (TREX) Systems Installation Guide on the SAP Service Marketplace at service.sap.com/instguides.