i execute the following script
SQL> @c:\sga_statistics.sql;

PL/SQL procedure successfully completed.

SQL> set serveroutput on;
SQL> /
> SGA CACHE STATISTICS
> ********************
> SQL Cache Hit rate = 99.24
> Dict Cache Hit rate = 99.67
> Buffer Cache Hit rate = 99.88
> Redo Log space requests = 1440
>
> INIT.ORA SETTING
> ****************
> Shared Pool Size = 52428800 Bytes
> DB Block Buffer = 32768 Blocks
> Log Buffer = 20971520 Bytes
>
*** HINT: Log Buffer value is rather low!

should i have to increase the size of log_buffer Because Redo Log space requests = 1440 is high?
What u'll suggest Sir?
thanx in advance