Regarding lock at SAP system

hay,
our client says, suddenly today SAP 40B Prod system does not allowusers to login to system. so we had restarted the server. but we would like to know the possible reason for this occurence.
could somebody guide me what are all things i have to check and what could be reason to get lock.
I checked Systemlog but could not able tojudge particular reason for it..is there any procedure to findout.
helps could be appreciated.
ambichan.

Hola Ambi,
there could be a lot of reason,
first one, you have dialog process, if all dialog process are busy ... you will not be abble to login to SAP. (I thing this case was not in the syslog).
seconde, maybe the table USR02 had some trouble, did you check the database table USR* ?
Regards
Frédéric

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Sachin Dangayach wrote:
Hi All,
>
> I have a problem regarding locks. I have designed a report using lock function modules to set locks and release them after the database operations and it works perfectly. There is another report which also does some DB operation on the same table but there are no table locks using enqueue function module implemented in this report and despite of lock set by first report on the table it is able to do the changes on the db table. I need to know how to overcome this problem.
> Thanks for your solutions.
>
> Regards,
> Sachin
lock procedure requires that all programs involved cooperate. Inconsistencies can occur if a program reads or changes data without having previously locked it. When a lock is set, the data records are only protected against changes by another program if this program also requests a lock before accessing the data.
Please check the above extract from [SAP help|http://help.sap.com/saphelp_nw04/helpdata/en/cf/21eed9446011d189700000e8322d00/frameset.htm], to maintain data consistency, it must be ensured that all the programs should lock the data before changing.
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How to unlock users in a SAP system if all of them are locked
Posted: Mar 21, 2007 10:07 AM         Reply      E-mail this post
Hello Experts,
In any SAP System,if a user having authorizations has mistakingly locked all the users of the SAP system,then how wll we unlock those users bcoz we wont be able to logon into the SAP System. Requested to revert your valuable replies at earliest.This happened with us,how to resolve it.My Email Id is [email protected] .
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Actually waht happens is if the uflag field of an user in table usr02 is 0 then the user is unlocked. Different values of the uflag field in table USR02 mean:
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Regarding lock at SAP system

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