Roll in and roll out

hai
what is rollin and rollout ?
what is saint update?

Hi,
When users request for connection to the sap server, all the requests are put in a queue by the dispatcher. When the dispatcher finds a free workprocess, the user request is assigned to that work process on FIFO basis. Data input provided by the user are transfered to the memory area of the workprocess. The work process communicates with the database as per the requirement of the user querry and picks data from the database into its memory area and inturn returns it to the user.
When the user terminates the connection the work process attached to it flushes its memory area and becomes free again to be assigned to another user request. This flow of data into the memory of the workprocess and flushing of data from the memory of the work process is known as roll-in and roll-out.We can say the rollin takes place at the begining of a user request and rollout takes place on termination of the same.
SAINT update:
saint update means applying a patch to enhance the functions of saint. This becomes necessary to accomodate the newer attributes of the new add-on support packages. Saint is mainly used for add-on tools.
Hope this clarifies your querry.
Pls dont forget to award points if solved.
Regards

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Local roll area and Roll area

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hii
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hi guru
commit work and roll back with simple language and simple example

Hi,
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Hi Guys,
I have a some doubt after Going through the links :
Difference between redo logs and undo tablespace and Oracle DBA ADMIN Guide (E25494-02).
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Errors in file d:\install\pracledb\diag\rdbms\dba\dba\trace\dba_ora_5592.trc:
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3) Shut abort in another session.
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ORA-01157: cannot identify/lock data file 10 - see DBWR trace file
ORA-01110: data file 10: 'D:\INSTALL\PRACLEDB\ORADATA\DBA\UNDOTBS2.DBF'
ORA-1157 signalled during: ALTER DATABASE OPEN...
Sun Oct 28 18:20:04 2012
Checker run found 1 new persistent data failures
Please Help on understand this

Sourabh85 wrote:
Hi Hemant,
Thank you very much , really very helpful. One More Question :
Why Oracle do the Double work ? First Populate the Undo Blocks and then do the roll backward ? Why Not directly recovered from the redo logs for uncommitted txn.Its not the doubling of the work. Oracle updates teh Undo blocks with the old data and since the Undo blocks are also just like the Other data blocks, any changes done to them is also logged as a Change Vector to the redo log files. This means, that there would be an Undo data block change vector recorded in the redo log file before the change vector of the data block which contains the data of your statement. This is what is meant when it is said that the redo log also contains the old images . The idea is to do the recovery, when needed, in the same sequence(based on the SCN's) using everything from the redo log files. This would include the recovery of the Undo datafiles as well in the case they are lost too!
HTH
Aman....

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