on 06-29-2007 12:05 PM
Hello,
Can somebody pl. tell me what is function of SCS instance in NW04s.
It contains message and enqeue services
But another instance also has message and enqueue services for the same istance.
Thanks in advance.
Regards,
Tushar Chavan
Hi Thushar,
if we install ABAB stak and JAVA stack both
we see SCS in which message and enqueue services of JAVA stack are maintained
and in other instance message and enqueue services are maintained for ABAP stack
in SCS
The <b>message service</b> administers a list of the dispatchers and the server
processes of the Java cluster. It represents the infrastructure of data exchange
(for small quantities of data) between the nodes involved. In the case of load
balancing between a large number of Java instances, it also provides the load
balancing information for the SAP Web Dispatcher.
The <b>enqueue service</b> administers logical locks that are set in a server
process by the executed application program. It is also used for cluster-wide
synchronization.
hope this will clear your query
Samrat
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Hello Tushar ,
The Central Services form the basis of communication and synchronization for the Java cluster.
The Message Service keeps a list of the dispatchers and server processes of the Java cluster. It represents the infrastructure for data exchange (small datasets only) between the participating nodes. The message service also supplies information to the SAP Web Dispatcher about Load Balancing Between Many Java Instances.
The Enqueue Service manages logical database locks, which are set by the executed application program in a server process. The enqueue service also synchronizes data across the cluster.
Integration
Central Services are always required when a Java cluster is installed. They are started on a server with their own system number and the system ID (SID) of the whole system.
Hope this will help you to understand .
Regards,
Santosh
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