When user connects to teradata database he opened a session with parsing Engine(PE)
there after when user submits a query,
1. First PE takes query, checks syntax, verifies his access rigthts
2. If every thing looks okay, PE prepare an action plan for AMP.
Which AMP to respond , what is row ID to read ...etc
3. Then PE sends action plan to AMP via BYNET signals.
4. Then corresponding AMP takes action plan and reads data and send back to PE
5. Then PE sends data to USER
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