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Explain me about rollback and commit

 
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mf_karthik

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Joined: 26 Jul 2005
Posts: 55

PostPosted: Wed Dec 07, 2005 7:52 am    Post subject: Explain me about rollback and commit
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hi
explain me about rollback and commit?
where we see the rollback and commit?
which is lowest locking mode?
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iknow

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Joined: 22 Aug 2005
Posts: 413
Location: Colarado, US

PostPosted: Wed Dec 07, 2005 7:57 am    Post subject: Re: rollback and commit
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Hi mf_karthik,

A commit occurs automatically at the end of the program, or by request one or more times during the execution of the program. Releases all locks acquired by the program since the last commit, so that other programs and users may obtain access to the data. Any open cursors are automatically closed. All database changes are made permanent.If any changes made to the tables are not appropriate, then all the changes must by rolled back resulting in the same state of data as they were prior to making changes. Release all locks acquired by the program.


Hope this helps.
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mf_karthik

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PostPosted: Wed Dec 07, 2005 8:05 am    Post subject: Re: rollback and commit
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thnks for your answers
explain me where we will see that?
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iknow

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Joined: 22 Aug 2005
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Location: Colarado, US

PostPosted: Wed Dec 07, 2005 8:21 am    Post subject: Re: rollback and commit
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Hi mf_karthik,

Quote:
where we see the rollback and commit?


check this link for more information

http://www-128.ibm.com/developerworks/db2/library/techarticle/dm-0505stolze2/
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Jag

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Joined: 07 Dec 2005
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Location: India

PostPosted: Sun Dec 11, 2005 12:59 pm    Post subject: Hi
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HI,

After every logical unit of work the changes will be commited...If you want to commit in middile you will be giving explict...Commit or rollback...

we can see that in between the program


Exec Sql
Commit
End-Exec..

Or rollback

Exec Sql
Rollback
End-Exec..

This way we will be issueing the command inbetween the program when we like to commit or rollback ...


Cheers,
Jag.
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PostPosted: Sun Dec 11, 2005 7:37 pm    Post subject:
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hi,

rollback: if u happend to update a table and u thought the information is wrong.then you can roolback(this option will uncommit all your information entered)
commit:if u commit a table all the updations u made will become perminant means they reamin unchanged, and u will get a sink opint.

but the data definition curious automaticlly comments.

Cheers,
TVM Kishore
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senthilssg

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Joined: 09 Dec 2005
Posts: 64
Location: USA

PostPosted: Mon Dec 12, 2005 11:10 am    Post subject:
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Hi,

i want to add a one more point regarding this ,

Auto comit will occur for every statements which are all executed in SPUFI.

Regards,
senthil
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Jag

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Joined: 07 Dec 2005
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PostPosted: Mon Dec 12, 2005 7:02 pm    Post subject: Re: Explain me about rollback and commit
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Hi,

Every query executed will not get commited in SPUFI unless you specfity default as COMMIT while entering the SPUFI..So you have a choice either to commit automatically or rollback automatically...If you specify rollback automatically then you have give explict commit in spufi to reflect the changes in the database.

Cheers,
Jag
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parikshit123

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Joined: 01 Jul 2005
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Location: India

PostPosted: Tue Dec 13, 2005 5:49 pm    Post subject:
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Okay,

To summarize,

Commit and Rollback are transsaction control commands ( as described by CODD).
These commands are issued automatically / explicitely by application programs or users.

Commit Saves the changes
Rollback : Undo the changes till last commit ( explicit or implecit).

Almost every application programming interface provides the ways to issue these statements explicitely in the program.

More information on this can be found on any database manuals. All most all RDBMS should have a provision for this. ( DB2 has)

Thanks,
Parikshit
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speedcnu

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Joined: 27 Jan 2004
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Location: Hyderabad

PostPosted: Wed Dec 21, 2005 11:13 am    Post subject:
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Good Explanation on Commit and Rollback...Any one who have min knowledge on DB2 he/she can easily understand.
Thanks to All.. icon_lol.gif
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speedcnu

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Joined: 27 Jan 2004
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Location: Hyderabad

PostPosted: Wed Dec 21, 2005 11:18 am    Post subject: Good Explanation...
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Good Explanation on Commit and Rollback...Any one who have min knowledge on DB2 he/she can easily understand.
Thanks to All.. icon_lol.gif
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feellikeneo

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Joined: 19 Mar 2007
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Location: Chennai

PostPosted: Wed Oct 10, 2007 3:32 pm    Post subject:
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to add up one more,,,,

when a cursor declared with "WITH HOLD" option overrides the Commit command meaning the cursor will not be closed.

Cheers,
Neo icon_smile.gif
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