How complete refresh works internally?

How complete refresh works internally?
We have 2 databases A and B. A is the master database and B is replica of A. Basically we want to implement complete refresh mechanism for our database A and B at some time mid night.
I need to know, How complete refresh works internally?
Actually we need our replica database up and running 7X24 for users and definitely we cannot effort any down time for that database.
Now I would like to know:
1.How complete refresh works internally? Whether complete refresh truncate all the tables first from Replica database and then insert or any other mechanism is there.
2.If complete refresh truncate all tables from replica database, how can we make sure about the complete availability (7X24) of our replica database.
Any input is going to help a lot.
Regards,
Sanjeev

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How group by works internally

Hi,
I would like to know how group by works internally using data and index cache( informatica uses data and index cache... not sure oracle uses the same). Consider the following table T with columns A and B.
A      B
A1    1
A2    2
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Edited by: saffron on Nov 19, 2009 9:18 AM

saffron wrote:
I would like to know how group by works internallyWhy?
using data and index cache( informatica uses data and index cache... not sure oracle uses the same).It caches data and indexes but it doesn't use those terms
I am selecting SUM(B) GROUP BY A
My understanding is as follows
1. Reads row 1 and stores in data cache.
2. scans entire table to find the A1s. As an when a row is found, cache them to data cache.
3. Perform SUM for A1 and store result in index cache.
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Please let me know if this is true.
Very unlikely.
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http://tahiti.oracle.com/

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If you create a new session for every test run at each volume level, you can query V$SESSTAT for the statistiic 'redo size' so as to identify the Bytes of Redo for each volume level. And then extrapolate from there !
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http://hemantoracledba.blogspot.com
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wickiemedia wrote:
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Message was edited by:
Christoph G.

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