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This article is to share with you about the meaning of R and 3 of the SAP RMager 3 system and the principle of load balancing. The editor thinks it is very practical, so I share it for you to learn. I hope you can get something after reading this article.

In 1972, SAP was born and launched the RF system (real-time financial accounting system), which was later named R1.

R means Real time. 3 not only refers to the third generation system, but also represents the three-tier architecture.

The three-tier architecture is Presentation server Layer,Application server layer and Database server layer in the following figure, respectively.

It is worth mentioning that the wheel of time has entered the year of the Pig in 2019, and the presentation server layer supports other technologies in addition to the traditional SAPGUI pictured above:

ABAP In Eclipse

ABAP in WebIDE

ABAP in Visual Studio Code

In my official Wechat account "Wang Zixi", I once published an official account article: the SAP IDE I used in those years.

It introduces the different implementation technologies of presentation layer (presentation layer) mentioned above.

The following figure shows ABAP development in Eclipse:

ABAP development in browsers:

Developed in Microsoft's Visual Studio Code:

Take a look at the middle application server layer:

Here we can see that the application server layer supports load balancing, and the user of SAPGUI will specify the address of the message server Message Server.

When a user logs in through SAPGUI, the message server distributes the user request to the least loaded application server instance.

The following figure means that in any server instance of a SAP system, you can view all application server instances of the system using the transaction code SM51.

An example of a database server is available from the menu System-Status.

SAP Netweaver application servers can connect to multiple databases, each of which can come from a different database provider.

Use the transaction code DBCO to maintain the connection details to the database server on the Netweaver application server:

From the DBMS field, you can get all the database servers supported by NetWeaver, such as MaxDB,Infomix, Microsoft SQL Server,Oracle DB, etc.

The above is the meaning of R and 3 of SAP Rhamp3 system and the principle of load balancing. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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