nttexp

ORA-7445 [nttexp] in Alert Log Every 60-Seconds [ID 1491340.1]

Applies to:

Oracle Net Services - Version 9.2.0.6 and later
Information in this document applies to any platform.

Symptoms

On Oracle9i Enterprise Edition Release 9.2.0.6.0 - 64bit Production:

Oracle continuously (every 1 minute) generate 'ORA-07445: exception encountered: core dump [nttexp()+0] [SIGSEGV] [Address not mapped to object] [0x000000000] [] []' errors and trace file in Default Background Dump Destination folder, /opt/oracle/product/9.2.0.6/rdbms/log directory

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Errors in file /opt/oracle/product/9.2.0.6/rdbms/log/prod1_ora_24310.trc:
ORA-07445: exception encountered: core dump [nttexp()+0] [SIGSEGV] [Address not mapped to object] [0x000000000] [] []
Fri Aug 31 01:54:52 2012
Errors in file /opt/oracle/product/9.2.0.6/rdbms/log/prod1_ora_24509.trc:
ORA-07445: exception encountered: core dump [nttexp()+0] [SIGSEGV] [Address not mapped to object] [0x000000000] [] []
Fri Aug 31 01:55:52 2012
Errors in file /opt/oracle/product/9.2.0.6/rdbms/log/prod1_ora_24887.trc:
ORA-07445: exception encountered: core dump [nttexp()+0] [SIGSEGV] [Address not mapped to object] [0x000000000] [] []
...
...
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We need to stop this error ORA-7445 since it is filling up file system

Changes

 No known changes.

Cause

Issue was related to the 9iR2 Instance/Service registration with 11gR2 Listener running on the default port, 1521.

Verified from the Listener Control (LSNRCTL) STATUS/SERVICES command outputs against the 11gR2 Listener.
 

Solution

1. Disable the Service Registration for the 9iR2 instance with the 11gR2 Listener by setting the LOCAL_LISTENER initialization parameter for the 9iR2 database instance(s) to point to the 10gR2 Listener's port.

For example:

  SQL> ALTER SYSTEM SET LOCAL_LISTENER = '(ADDRESS = (PROTOCOL = TCP)(HOST =hostname)(PORT = 1526))' SCOPE=BOTH;


2. Or if the Service registration for the 9iR2 instance(s) are no needed, then set the LOCAL_LISTENER initialization parameter for the 9iR2 database instance(s) to point to an unused port, such as 1528:

For example:

  SQL> ALTER SYSTEM SET LOCAL_LISTENER = '(ADDRESS = (PROTOCOL = TCP)(HOST = hostname)(PORT = 1528))' SCOPE=BOTH;


3. Then check the alert log and Default Background Dump Destination folder to ensure the trace files are no longer being written.