Hello Oracle Gurus

I am facing a problem again & again. Actually we ate using a tailor based erp package and the developer has written queries in sucn a way that after evert 5-10 diff. whole application gets locked means if a 2 users simlutaneouly creating purchase order or gate pass for different units system locks the database and in the dump file it gives dump memeory error. my utlbstat & estat gives optimum performance chat. i have tried every thing but i vain. please help


Gurpreet Singh Sethi