Hi Oracle Guru's

my system is having 2GB memory.

my sga is

Total System Global Area 1038995364 Bytes
Fixed size 94116 Bytes
Variable size 317857792 Bytes
Database buffers 719978496 Bytes
Redo Buffers 1064960 Bytes

init.ora parameters are :

DB_BLOCK_BUFFERS = 175776
SHARED_POOL_SIZE = 251135488
LARGE_POOL_SIZE = 614400
JAVA_POOL_SIZE = 20971520
LOG_BUFFER = 1048576

BLOCK SIZE IS 4K.

Can any one suggest me, how to determine the initial SGA size. Some documents are suggesting that SGA should be 1/3-1/2 of the physical memory. My system is running OLTP applications.

Please treat this as an urgent issue. Because I am making changes remotely to my Beijing(CHINA) Database.

Thanks in Advance.