causes the ORA-031237 error?
ORA-03137: TTC protocol internal
error :    
Answer: The oerr utility shows
this for the ORA-03137 error:
protocol internal error: [%s] [%s] [%s] [%s] [%s] [%s] [%s]
Cause: TTC protocol
As we see, there is an associated trace file and this
file will have more information on the ORA-03137 error.
This is usually a bug.
This is an internal error and you need to open a SR on
In 11g, there is fix by upgrading to Oracle 18.104.22.168. and a workaround by setting
"_optim_peek_user_binds"=false. Set this parameter ON
LY with the consent of MOSC.
Solarwinds notes this on the ORA-03137
"Although upgrading to database
version 22.214.171.124 has been confirmed to have solved this
issue in a high number of cases, error ORA-03137 
accompanied by Protocol Violation messages may still occur
intermittently in database versions prior to 11.2, including
database 10.2.0.4 and 126.96.36.199.
This has been reported in unpublished
bug:8625762 ORA-3137  due to bind data not read from
wire, in which case ORA-3137  can occur
intermittently for SQL which uses user binds due to bind
data being left unread on the Net connection.
The bug suggests the workaround of
setting "_optim_peek_user_binds"=false to avoid this problem
(workaround to be used with caution as it can affect
execution plans chosen by CBO), and also provides the fix by
the application of
- ORA-600  / ORA-03137  Troubleshooting [ID
NOTE:752297.1 - ORA-03137: TTC Protocol Internal Error :
 Using JDBC Driver
NOTE:35928.1 - ORA-600  "Fatal Two-Task Protocol
- ORA-7445 [kxsOpenACursor()+1087] & ORA-03137 
Errors [MOSC ID 1325759.1]
patch 9703463 for ORA-03137.
- Bug #7445550 related to JDBC connections to the
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