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Don Burleson Blog

Resolving the ORA-02050: transaction string rolled back error

Oracle Database Tips by Donald BurlesonDecember 4, 2015

Question: During an update I got this message ORA-02050: transaction xxx rolled back, some remote DBs may be in-question. How to I fix the ORA-02050 error?

Answer: The ORA-02050 is for distributed updates, over a database link, and it's often the result of losing connectivity during an update:

ORA-02050: transaction string rolled back, some remote DBs may be in-question

Cause: network or remote failure in 2PC.

Action: Notify operations; remote DBs will automatically re-sync when the failure is repaired.

The root cause of this is a network failure, not Oracle. Read this on the two phase commit for details:

First, you need to clean any in-flight transaction that may have failed by querying dba_2pc_pending:

select * from dba_2pc_pending;

Since the root cause is a network failure, get your Network Administrator to monitor the network with netstat, looking for lost packets or other network errors.

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