SESSIONS WAITING ON INACTIVE TRANSACTION BRANCH, GLOBAL HASH COLLISION 12c, 11g Oracle RAC(distributed transaction)

When performing XA transactions against a multi-node Oracle RAC configuration, some branches of the transaction may not commit.. this is a known bug, but to tell the truth no bug fix helped me to solve this problem until I came across IBM technote. https://www-304.ibm.com/support/docview.wss?uid=swg21460967

There are several workarounds but I prefer Work around 1.  I have used it and works perfectly.

1. If using pfile (init.ora) files, add the following line to the file:

_clusterwide_global_transactions=false

2. If using an spfile, issue the following command from SQL*Plus:

alter system set “_clusterwide_global_transactions”=false scope=spfile

3. Restart the database (you can restart nodes , one by one)

Problem should dissapear.