DB Interaction

[Former Member]

Hello!

I have a question about the interaction between DB and Application layer within Web AS Java. How is the the interaction DB<--> Applicatoin Layer established, if we have a central instance as well as many dialog instances in SAP Web AS Java?

Is the interaction established only during the central instance or has every dialog instance a special connection to the DB-layer?

Is there differencies between Java and ABAP stack regarding Application Layer <--> DB interaction?

Thank you!

Regards

[Former Member]

Hi Peter,

if you have dialog instances on remote servers, the database must be configured for remote access (most probably via TCP/IP), so the work processes in the dialog instances have to have a connection to the database. Also the connect user must exist on OS level. You can watch what happens during "startsap" procedure, also on the dialog instances startsap checks if the database is up and running. The behaviour is the same on ABAP and on JAVA application servers.

Regards,

Pascal