Polyglot Persistence: Application requires multiples types of database Here multiple types of DB is used to perform operation in application. ***if you store data in disk, it will persist even if database server goes down. ***if you write data in memory, it will not persist as database server goes down.
Asynchronous Communication (Non Blocking Call) 1. Time Delay 2. Work from home 3. Youtube video's comment section 4.When computation takes long time; Flipkart page open but processing takes time 5. Scalability of application ; It doesn't wait for notification from another user placing order 6. Avoid Cascading failure ; At times if with response server becomes overload ,it is made asynchronous inorder to let server work on it.
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