i want to lack the table while extracting the file....

vijaydev · Post by **vijaydev** » Tue Jul 24, 2007 9:41 am

We have a requirement like we have to update a flag before and after running our sequences

Eg. The table structures is

SeqNo TableName Result

1 P1 50 ( If the result is 50 we will start our jobs and the run time we will update this table is 10 at that time other dependency jobs wont run)

2 P1 10 ( at the time of running)

3 P1 20 (after finishing we will update as 20) its

our requirement in this table seqno is primary key , its working for fine if only one sequence is running, we are facing the problem when we are running the two sequence at the same time its get the same max sequence number and try to put duplicate seqno. While picking the max sequence number I want to lock the table.

Vijay

kumar_s · Post by **kumar_s** » Wed Jul 25, 2007 1:29 am

Need some clarification with your requirement.
If you lock the table, the flow which is not dependent on the current running or sequence that are about to run will also need to wait till the current one to finish. But If I understand properly, it should not be the case.
If that is the case, you can very well pick up the max sequence no only if the Result is 20.
Else optionallay you have have another cloumn to maintain another number uniqule identify each flow of your project.

vijaydev · Post by **vijaydev** » Wed Jul 25, 2007 7:28 am

No, only the jobs/sequence which is access the table needs to be wait.

kumar_s · Post by **kumar_s** » Wed Jul 25, 2007 11:37 pm

That case you can follow and maintain another column for each flow so that you ll get the uniqnes with combination of the fields.
What is the Database?
Other option would be, lock the table manually using Database comand.
If its oracle, LOCK TABLE <tablename> IN EXCLUSIVE MODE;