HOW INCREASE SGA IN ORACLE RAC 10 G WITH 2 NODES

Question

How increase sga_max_size, sga_target in ORACLE RAC 10 G WITH 2 NODES;
i have oracle 10g in unix hp-ux 11i in rac (2 nodes)
with sga 8g; and i want to increase 12g;
i can alter these parameters without shutdown the entire database ?; , i can alter and take these change in one node first and later de second node?
i used in first node :
1- alter system set sga_max_size=16g scope spfile;
2- alter system set sga_targer=12g cope spfile;
later i restard all intance one by one:
srcvtl stop instance -d my_database -i my_instance1 -o immediate;
srcvtl start instance -d my_database -i my_instance1
3- in second node.
srcvtl stop instance -d my_database -i my_instance2 -o immediate;
srcvtl start instance -d my_database -i my_instance2
but my sga is the SAME 8G.. WHY NOT CHANGE...
i changed these parameters and restar my instance in first node later stop and start using srvctl the second node but my sga not change. continue in 8g ;however these changes are in spfile so;
prd2.sga_max_size=8589934592#internally adjusted
prd1.sga_max_size=8589934592#internally adjusted
*.sga_max_size=17179869184
prd2.sga_target=8589934592
prd1.sga_target=8589934592
*.sga_target=12884901888
prd2.thread=2
prd1.thread=1
how i can apply these change node by node or i need shutdown the entire database?
need to make these changes without affecting my application because i can not shutdown the both node...
Edited by: user568681 on 02-sep-2010 14:32

Answer 1

Hi,
I just checked on a test RAC configuration (HP-UX, 10.2.0.4)
You don't need to stop the database.
Keep your "rolling" original scenario but change :
alter system set sga_max_size=16g scope spfile;
alter system set sga_target=12g cope spfile;by
alter system set sga_max_size=16g scope spfile sid = 'PRD1';
alter system set sga_target=12g scope spfile sid = 'PRD1';
alter system set sga_max_size=16g scope spfile sid = 'PRD2';
alter system set sga_target=12g cope spfile sid = 'PRD2';Actually
alter system set sga_max_size=16g scope spfile;
alter system set sga_max_size=16g scope spfile SID='*';changes globally the values for every instance in the spfile ("*.XXXXXX" is updated) but it does not remove the specific entries already assigned to one particular instance (and it is your case !)
Alternatively you could reset the values assigned specifically to one instance with "alter system reset" to have only "*.XXXX" for those parameters.
Best regards
Phil