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Troubleshooting Perl scripts that work with Oracle

The Perl Database Intertface (DBI) is a database access Application Programming Interface (API) for the Perl Language. The Perl DBI API specification defines a set of functions, variables and conventions that provide a consistent database interface independant of the actual database being used.

Basic Oracle parameters

There are several parameters that should be present in environment. If some of them are missing errors occur.

Without these being set correctly, Oracle cannot operate properly or give good performance. These need to be checked before further fine tuning.

It make sense to do further troubleshooting only is key parameters are okay.


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Troubleshooting mod_perl (Practical mod_perl)

22.1.2. install_driver(Oracle) failed: Can't load `.../DBD/Oracle/Oracle.so' for module DBD::Oracle

Here's an example of the full error report that you might see:

install_driver(Oracle) failed: Can't load
'/usr/lib/perl5/site_perl/5.6.1/i386-linux/auto/DBD/Oracle/Oracle.so'
for module DBD::Oracle:
libclntsh.so.8.0: cannot open shared object file: 
No such file or directory at
/usr/lib/perl5/5.6.1/i386-linux/DynaLoader.pm line 169.
at (eval 27) line 3
Perhaps a required shared
library or dll isn't installed where expected at 
/usr/local/apache/perl/tmp.pl line 11

On BSD-style filesystems, LD_LIBRARY_PATH is not searched for setuid programs. If Apache is a setuid executable, you might receive this error. Therefore, the first solution is to explicitly load the library from the system-wide ldconfig configuration file:

panic# echo $ORACLE_HOME/lib >> /etc/ld.so.conf
panic# ldconfig

Another solution to this problem is to modify the Makefile file (which is created when you run perl Makefile.PL) as follows:

  1. Search for the line LD_RUN_PATH=
  2. Replace it with LD_RUN_PATH=my_oracle_home/lib

where my_oracle_home is, of course, the home path to your Oracle installation. In particular, the file libclntsh.so.8.0 should exist in the lib subdirectory.

Then just type make install, and all should go well.

Note that setting LD_RUN_PATH has the effect of hardcoding the path to my_oracle_home/lib in the file Oracle.so, which is generated by DBD::Oracle. This is an efficiency mechanism, so that at runtime it doesn't have to search through LD_LIBRARY_PATH or the default directories used by ld.

For more information, see the ld manpage and the essay on LD_LIBRARY_PATH at http://www.visi.com/~barr/ldpath.html.

ORA-12545 Connect failed because target host or object does not exist

Topics

  • What is this error?
  • How to fix it
  • 5-June-2001
    Author:
    Kavitha Soundararajan

    What causes this error?

    This happens when the client is not able to contact the listener on the node specified. Error occurs when the listener has not been started on the node or if the node address has been specified incorrectly.

  • How to fix it

    This message occurs when the listener on the remote node cannot be contacted.

    Did you add the host name and IP in your DNS server?

    You can try tracing the path or the route a connection is taking from the client to the server. If it encounters an error, then it returns the error stack which gives us more information when compared to an cryptic one line error.

    Execute the following : trcroute "db_name" This will help you find the problem and fix it. The problem may fall into one of the following areas:

    Check TNSNAMES.ORA
    The TNSNAMES.ORA may contain a wrong address. Check the host and port have been specified correctly. Check the details against the LISTENER.ORA file.

    Check the remote node
    Check if the listener has been started on the remote node. Check the status with the STATUS command of the listener control utility:
    lsnrctl
    lsnrctl> status listener_name

    listener_name is the name of the listener defined in the listener.ora file. If you have not changed the listener name, then it would be called LISTENER.

    If the listener has not been started, start it with the command:
    lsnrctl> start listener_name

    You can check if the fix worked by executing TNSPING . It would return an "OK" message if the TNSPING has been successful.



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