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JDBC transaction dead-lock: solution required?


JDBC transaction dead-lock: solution required?

By : user3861730
Date : November 21 2020, 07:01 PM
should help you out I believe your friend is correct if the selects are for an update of the record(s) already updated (but not yet committed) by the other thread. If they are simply selecting data, and the JDBC framework isn't helping you by forcing a select for update, then you are correct.
To avoid the issue, make sure you're only selecting for update if you truly need it, and in that case, use the NOWAIT option in the select. This will cause an error to be raised if the operation would block.
code :


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Webservice calls within the same JDBC transaction are causing DB lock timeouts

Webservice calls within the same JDBC transaction are causing DB lock timeouts


By : user2979927
Date : March 29 2020, 07:55 AM
I hope this helps . I think your approach is reasonable, and you should definitely try row-level locking if it's possible.
You might want to reconsider your design. Is the database duplicating state which really comes from the web service? In that case, you might want to consider caching the web service calls instead. But that depends on your application.
code :
performTransaction() {
    doWSCall();
    // no need to worry about WS call exception, because DB call won't happen
    try {
        doDbCall()
    } catch (Exception ex) {
        rollbackWSCall()
        // rethrow ex
    }
}
How does JDBC Transaction lock a table in TRANSACTION_READ_COMMITTED isolation level?

How does JDBC Transaction lock a table in TRANSACTION_READ_COMMITTED isolation level?


By : arun mepits
Date : March 29 2020, 07:55 AM
Any of those help No, in order to make sure that you always have unique number you will need to: 1) [better] change the DB field to identity/sequence/auto-number depending on DB 2) use UUID as identifier 3) [worst] lock the row for the duration of read/increment/write sequence
TRANSACTION_READ_COMMITTED will only make sure that you can read ONLY the data that is already committed to DB. I.e. if you had another 200 DB operations between your
code :
UPDATE sequence 
commit
Lock wait timeout exceeded; try restarting transaction using JDBC

Lock wait timeout exceeded; try restarting transaction using JDBC


By : AVT_DB
Date : March 29 2020, 07:55 AM
Does that help Modify your code and reorder the executions as follows. It should work fine:
code :
Statement statement = connection.createStatement();
statement.execute("insert into student values (3,'kamal')");
connection.commit();

Statement statement1 = connection1.createStatement();
statement1.execute("delete from student where student_id = 3");
connection1.commit();
how to prevent transaction dead lock when the client crash down?

how to prevent transaction dead lock when the client crash down?


By : DisplayName=
Date : March 29 2020, 07:55 AM
this will help the code in my server:
code :
                    // evict all client map cache
                IList<Object> evictList = hz.getList(NearCacheTest.SEMAPHORE_EVICT);
                evictList.add("1");
                evictList.add("2");

                int size = hz.getClientService().getConnectedClients().size();
                ISemaphore semaphore = hz.getSemaphore(NearCacheTest.SEMAPHORE_EVICT);
                semaphore.release(size);
                logger.info("client count:{}", size);

                // wait to response from clients
                while (semaphore.tryAcquire()) {
                }
Multi-thread dead lock:Will this design cause dead lock?

Multi-thread dead lock:Will this design cause dead lock?


By : Zkoshy
Date : March 29 2020, 07:55 AM
Hope this helps Since you did not post the implementation of your event classes there might be multiple issues in your code.
As already mentioned your access to m_bPaused might be an issue. Thread B calls Set() right before Wait(0). Are you sure that thread A will get notified or does Thread B consume the notification. In nearly all multi thread classes there is the problem of a spurious wake. It seems that your Thread B is not protected against this.
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