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Instance Type

Avantra supports the following SAP Instance Types:

Central

An SAP Web Application Server ABAP instance. The one marked as Central by Avantra is usually the primary Application Server as well.

The term Central is still used by Avantra to indicate that this is the Application Server where the SAP System related checks are executed.

Central+Java

Same as the SAP Web Application Server ABAP CENTRAL instance above, but includes a Java stack as SAP NetWeaver Add-In installation.

Central+Java instance types are deprecated by SAP. It is recommended to run separate ABAP or Java systems.

Dialog

An instance of an SAP Web Application Server ABAP that is not the central instance

Dialog+Java

An instance of an SAP NetWeaver Add-In installation with ABAP and Java stack that is not the central instance.

Java

An instance of an SAP Web Application Server Java.

Java_Scs

A (Java) SAP Central Services instance.

Abap_Scs

An ABAP SAP Central Services instance.

Trex

A TREX engine.

Web Dispatcher

A SAP Web Dispatcher instance.

Abap_Scs with Web Dispatcher

An ABAP SAP Central Services with integrated Web Dispatcher.

Enqueue Replication Server

An Enqueue Replication Server.

In addition to these terms we also use the following grouping terms:

ABAP or ABAP-only instance

An instance of type Central or Dialog or Abap_Scs.

ABAP+Java instance

An instance of type Central+Java or Dialog+Java.

Java or Java-only instance

An instance of type Java or Java_Scs.

For those SAP Systems that do not have an primary application server (i.e. a classical Central SAP Instance), Avantra chooses one to be considered central. This SAP Instance is performing the monitoring of the SAP System. It is flagged with a  icon.

Interpolation

Interpolation is a placeholder used in the Notification process in Output Channels and Filter Lists. During the processing of a Filter List or an Output Channel, an Interpolation retrieves a particular value available at runtime. Interpolations are the improved version of Macros which they replace.

The term Interpolation comes from the Apache FreeMarker Template Language (FTL) which is used in the Notification process since Avantra 6. For the sake of consistency and easier reference to FTL, we stick to the terminology used in there.

The major difference between the deprecated Macros and Interpolations: the former one is always a string, the latter one can also be of type boolean, date, time, and others. In other words, Interpolations are strictly typed. However, you can always convert any Interpolation into a string.

More exactly, we had to distinguish between a variable and its value, the latter of which it gets through the process of interpolation. However, for the sake of simplicity we stick to one term for both.