SAP NetWeaver AS Java: High Availability


This section describes the features of SAP NetWeaver Application Server (AS) Java to achieve high availability. We describe the causes of downtime and the effects of such failures. We also describe how you can avoid or decrease downtime for SAP NetWeaver AS Java.

This part of the documentation refers to SAP NetWeaver AS Java.

For more information on SAP NetWeaver AS ABAP, see SAP NetWeaver AS ABAP: High Availability and

For more information on SAP NetWeaver technical infrastructure, see the Technical Infrastructure Guide: SAP NetWeaver 2004s, which you can find on SAP Service Marketplace at


You need to consider all levels of an SAP system running SAP NetWeaver AS Java. For more information, see:

·        Hardware and operating system

·        Network

·        Database

For more information on switchover software, see Switchover Software for High Availability.


You need to consider planned downtime to change:

·        Applications

You can change applications while the system is online, which means that only the changed application is unavailable. All other applications remain available.

·        Services of SAP NetWeaver AS Java

You have to make such changes offline, which means that SAP NetWeaver AS Java is not available.