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Datapump Export Fails With ORA-07445 [nszgclient()] (Doc ID 1401443.1)

Last updated on MARCH 12, 2021

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.2 to 11.2.0.3 [Release 11.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
Checked for relevance on 03-SEP-2013

Symptoms

Datapump exports and imports may fail with ORA-07445 [nszgclient()]

<trace_path>/xxxxx_dm01_xxx.trc
ORA-07445: exception encountered: core dump [nszgclient()+32] [SIGSEGV] [ADDR:0x4C] [PC:0xB0A3190] [Address not mapped to object] []


The typical call stack looks like this:

 

----- Current SQL Statement for this session (sql_id=8gtq2yhbhgga0) -----
INSERT INTO SYS.USER_LOGON_T SELECT SYS_CONTEXT('USERENV', 'AUTHENTICATION_METHOD') FROM DUAL
----- PL/SQL Stack -----
----- PL/SQL Call Stack -----
object line object
handle number name
0x26d33118 2 anonymous block
nszgclient <- kziaguenv <- kzctxEUsrEnv <- kzctxAppCtxValGet <- evactx
<- evaopn2 <- qesltcFastRowOperandsEvaluate <- qerltcLoadStateMachine
<- PGOSF802_qerltcInsertSelectRop <- qerfiFetch <- rwsfcd <- qerltcFetch
<- insexe <- opiexe <- opipls <- opiodr


 

This problem is encountered only when a LOGON TRIGGER is using the SYS_CONTEXT('USERENV','AUTHENTICATION_METHOD') call. If the logon trigger is using any other context variable with SYS_CONTEXT the error is not encountered. Equally if the trigger is dropped or disabled there is no error while running the export.

 

To reproduce the issue one can use the following steps:  

 

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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