Who has to solve?

load balancing in two rac issue............who need to solve
is it dba or architect level?
who has decide sga_target=
is it archtiect or dba

1. RAC DBA is responsible.
Oracle RAC job role best practices
There is a perpetual conflict between systems administrators (SAs), who traditionally manage servers and disks, and the RAC DBAs who are responsible for managing the RAC database. There are also clearly defined job roles for network administrators, who are especially challenged in a RAC database environment to manage the cluster interconnect and packet shipping between servers.
If your DBA is going to be held responsible for the performance of the RAC database, then it’s only fair that he be given root access to the servers and disk storage subsystem. However, not every DBA will have the required computer science skills to manage a complex server and SAN environment, so each shop makes this decision on a case-by-case basis.
Source:http://searchoracle.techtarget.com/news/2240016536/Understanding-Oracle-Real-Application-Clusters-RAC-best-practices
2. sga_target = Since it is related to SGA so its sole responsiblity of DBA. If there is any need regarding increasing RAM, CPU Usages, IO issues and if they find out as an OS issue; then SA is responsible.
Regards
Girish Sharma

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