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Oracle Tips by Burleson

Chapter 11 Oracle Fine Grained Auditing

was owned by CLAIM_SCHEMA. To find out what the user saw at the time, we can issue the following statements in sequence.

alter session set current_schema = CLAIM_SCHEMA;

This will instruct all the queries to be based on the CLAIM_SCHMEA schema.

execute dbms_flashback.enable_at_system_change_number(1553620)

This will place the reference time to that point in the past, mentioned by SCN. Now we will execute the SQL query.

select paid_amount from claims where claim_id = 1234567;

This will return 1200. The queries are repeated as many times as required to find the values at that time. At the end of the session, we can disable the flashback session by:

execute dbms_flashback.disable

Now all the queries will select the data as of now, not from the past.

This technique can be extended to become a self-sufficient querying system. Consider the following:

set linesize 4000


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