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Don Burleson Blog 







ORA-24756 Tips

Oracle Database Tips by Donald BurlesonJanuary 29, 2015

Question:  I am doing a distributed update and I get this ORA-24756 error:

is local tran 6.42.332492 (hex=06.2a.512cc)
insert pending prepared tran, scn=8151148567799 (hex=769.d6509cf7)
Wed Jan 30 16:45:02 EAT 2015
Errors in file /oradata/sfapdb/bdump/sfapdb_reco_2739.trc:
ORA-24756: transaction does not exist

I also found out there are some records (trans_id = "6.42.332492") in SYS.PENDING_TRANS$/ SYS.PENDING_SESSION$/dba_2pc_pending with "prepare" status. This transaction is launched from a Weblogic Server via JDBC.   How do I resolve this ORA-24756 error?
Answer:  If this does not always happen and it is sporadic, it may not be a bug, most likely a network error.

 There are many bugs associated with the ORA-44756 error, and there is always the likelihood that the root cause of the error was due to a network failure.

The oerr utility shows this for the ORA-24756 error:

ORA-24756: transaction does not exist

Cause: An invalid transaction identifier or context was used or the transaction has completed.

Action: Supply a valid identifier if the transaction has not completed and retry the call

This error is from a failed two-phase commit.  When Oracle makes a distributed update, he updates BOTH databases before committing the first update. 

When you lose connectivity between distributed updates you get entries in the dba_2pc_pending table.


MOSC Note 1327159.1:  How to check the user and the SQL text (DML) of a distributed transaction found in dba_2pc_pending

MOSC Note 159377.1:  How to Purge a Distributed Transaction from a Database 

MOSC Note 401302.1:  How To Resolve Stranded DBA_2PC_PENDING Entries

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