Anybody has answers???

I do have three questions
Would be great if someone clears them .
How can I insert data from a table to 3 tables at the same time in pl/sql?
What oracle does internally for a query like select * from dept;
What is Row migration ?
I shall be grateful for the answers
regards
shubh

> How can I insert data from a table to 3 tables at the same time in pl/sql?
Concurrently? You cannot in a single session as an Oracle is serialised and cannot be threaded.
Concurrency wise? As a single transaction. Do 3 inserts and commit the transaction.
If you imply something else, please clarify.
>What oracle does internally for a query like select * from dept
That depends just how technical you want to get. Simplistically Oracle will do a full tablescan of the table to provide you a consistent snapshot at the point in time the query was executed. (if someone else commits a transaction that deletes all the rows in DEPT, you will still see DEPT with the rows applicable at the point in time you fired off the SELECT)
The full table scan can consists of PIO (Physical I/O) and LIO (Logical I/O) - depending on whether or not the data needs to be fetched from disk, or whether the data is available in the buffer cache.
A full tablescan can also result in PQ (Parallel Query) processing. Oracle uses several PQ slave processes to assist in doing the scan - allocating a range of rows for each process to scan in parallel.
More than this is usually only of interest to the system programmer type and not the application developer type.
>What is Row migration ?
See Metalink Note:122020.1, Subject: Row Chaining and Row Migration
https://metalink.oracle.com/metalink/plsql/ml2_documents.showNOT?p_id=122020.1

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[email protected](
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