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expdp flashback_time tips

Oracle Database Tips by Donald BurlesonFebruary 20, 2015

Question:  I need flashback_time parameter of expdp to take a read consistent copy of my table.  How do I use the flashback_time parameter in expdp?

Answer:  Here is an example of a consistent export flashback_time with expdp.  In dbms_datapump, you use the set_parameter procedure to set flashback_time.

Flashback_time at current time

The  flashback_time=systimestamp syntax: is the current time.

root> cat myar.par

dumpfile=expdp.dmp
flashback_time
=systimestamp

root> expdp scott/tiger parfile=mypar.par

Flashback_time at specific time

Instead of the current time, you can specify any time which is possible within flashback capabilities (undo log sizes). using the to_timestamp argument. 

Oracle notes that the system change number (SCN) that most closely matches the specified time is found, and this SCN is used to enable the Flashback utility. The export operation is performed with data that is consistent up to this SCN.

root> cat myar.par

dumpfile=expdp.dmp
flashback_time
="to_timestamp('13-02-2014 12:21:00', 'DD-MM-YYYY HH24:MI:SS')"

root> expdp scott/tiger parfile=mypar.par 

Flashback_time at daily time

This takes an export at a fixed time each day.  This takes an export with the timestamp at which my script runs at 11 PM (sysdate + 22/24)

flashback_time="to_timestamp(to_char(trunc(sysdate)+22/24
,'YYYY-MM-DD'),'YYYY-MM-DD')"

For specifying complex date in flashback_time, see my notes here for using date manipulation with the to_timestamp function.

   
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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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