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| Understanding SyncPoint |
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| atheek |
 Posted: Tue Sep 26, 2006 9:20 pm Post subject: Understanding SyncPoint |
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Partisan
Joined: 01 Jun 2006
Posts: 327
Location: Sydney
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What exactly are syncpoints? Any set of action after the last commit/backout will constitute the current unit of work. Are syncpoints the points at which the commit/rollback is made? Also what is meant by doing a put outside syncpoint. Read somewhere that messages put outside syncpoint wouldnt be logged even if they are persistent.
Please help me out
Thanks in Advance |
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| elvis_gn |
| Posted: Tue Sep 26, 2006 9:34 pm Post subject: |
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Padawan
Joined: 08 Oct 2004
Posts: 1905
Location: Dubai
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Hi atheek,
You answered your question yourself....
When u start some process, where u could be putting say 'x' number of msgs on different queues, it will be under a transaction...if you commit(similar to a db commit) then the msgs are committed to the respective queues and that unit of work is complete....and the present status of mq is at syncpoint...
If a rollback occured, all the msgs which are in transaction in the current unit of work(which in other words, started from the moment u made the last commit, also called syncpoint) will be removed from the queues...
I hope I did not confuse you 
Regards. |
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| atheek |
| Posted: Tue Sep 26, 2006 9:55 pm Post subject: |
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Partisan
Joined: 01 Jun 2006
Posts: 327
Location: Sydney
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thanks Elvis, I got it...
please let me know what is meant by doing a put outside syncpoint. Every put statement should be a part of a UOW and will be either committed or roll backed at syncpoint. Now is it possible to do a put which will be made visible evrywhere immediately without waiting for a syncpoint. I have read some where in the forum about such messges which wouldnt be logged even if they are persisitent.. couldnt understand what it is!! |
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| elvis_gn |
| Posted: Tue Sep 26, 2006 11:41 pm Post subject: |
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Padawan
Joined: 08 Oct 2004
Posts: 1905
Location: Dubai
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Hi atheek,
When u do a normal put, it is in a UOW...if u made some other puts before that (after the last syncpint commit), those also will be in this UOW, u cannot commit this current put and have the previous puts to be still in transaction(i.e want them rolled back incase of error)...
This is with respect to one queue, i think when it comes to different queues, u can have one commited with other previous puts on other queues uncommitted...
Regards. |
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| atheek |
| Posted: Wed Sep 27, 2006 12:19 am Post subject: |
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Partisan
Joined: 01 Jun 2006
Posts: 327
Location: Sydney
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