Dear Friends,

I created two instances from database assistance.
initially both the instances were working fine.
After two-three days later first instance is working fine but whenever i try to connect second instance gives following error.

ORA-01034: ORACLE not available
ORA-09243: smsget: error attaching to SGA
OSD-04101: invalid SGA: SGA not initialized

Can any one help me to fix this problem.