Hi Kavitha,
I have seen a lot of same messages before. In your message, you limit your system with(abap/heap_area_dia =2000000000) so if your dialog process use more than 2GB memory(EM...... 2002743520). It caused ABAP dump: PXA_NO_SHARED_MEMORY.
You can increase abap/heap_area_dia = 8,000,000,000 to 8GB if you want your dialog process use more memory. Beware this may cause more PXA_NO_SHARED_MEMORY errors if there are already two dialog processes consumed 8GB memory because you have only 16GB memory in total.