Answer Posted / sainathraj

synchronous means one after the other.
Asynchronous is whole at a time.

Synchronous processing means processing the transactions(i.e
records) one by one.i mean a transaction is done if and only
if the previous transaction is completed.

Synchronous Update means after processing of transactions
records are stored into the database synchronously.I mean if
one transaction is processed it is immediately updated to
database.

Asynchronous processing means processing the transactions
all at a time.
Asynchronous update means updating the database with all the
records at a time. i.e not one by one

in session method all the transactions are processed and
kept in session.the session is then processed and records
are updated to database one by one.

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