PROCESS, SESSION and TRANSACTION parameter in Oracle 11g

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　　processes=x
　　session=(1.5 * PROCESSES) + 22
　　transactions=sessions*1.1
　　If we set lower value of sessions and transactions parameters than derived value, Oracle will automatically bump it to above derived value.
　　如果设置的会话值和事务值低于预期的值的话，oracle将会自动替换低于预期值的参数；
　　select name, value
　　from v$parameter
　　where name in ('sessions','processes','transactions');

　　select name, value
　　from v$parameter
　　where name in ('sessions','processes','transactions');

　　Since the value of session in spfile is lower than the derived vale therefore it’s taking derived value. There is no value set for Transaction therefore it’s taking derived value 4989. if your set value his higher than default value then oracle will take your given value.