Author: Marco Gralike
September 29

Small introduction to SQL*Net debugging [client side]

Say it’s that day again. You try to connect to a (new) database and once again you are facing SQL*Net problems.

C:/oracle/product/10.1.0/client/BIN>sqlplus /nolog

SQL*Plus: Release 10.1.0.4.0 - Production on Thu Sep 29 10:37:15 2005
Copyright (c) 1982, 2005, Oracle.  All rights reserved.


SQL> conn scott/tiger@lab.amis.nl
 

ERROR: ORA-12154: 
TNS:could not resolve the connect identifier specified

Blast!. What can you do? Once in a while i get a lot of these SQL*Net problems (network changes, etc, the wrong weather type). So to help you (and me), here i will you give you my grey-matter checklist 🙂 (it’s not complete but should help you to resolve 80% of the problems)

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August 23

OERR – In search of Error Messages/Events

Sometimes you want to search for Oracle database messages, their meaning or you are in search of specific database event settings.

For instance, a long time ago i was searching for an event that would trace when an datafile would expand / autoextend. I encountered latching problems on a Siebel system based on an new Oracle Failsafe environment (Windows 2000 cluster). I wanted to be sure that these latching problems weren’t introduced by the newly introduced datafile AUTOEXTEND feature.

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May 20

Mastering XML DB – COUNT and SUM

Working for years with Oracle’s relational environment, XML DB is a completely different kind of beast. You’re confronted with all the languages and techniques the XML environment has to offer – XML, XML Schema, XSLT, Xpath, DTD, DOM, SAX, etc,etc,etc – plus the ones you know from Oracle’s (object) relational (database) world, SQL, PL/SQL, java, OCI, java, etc.

I am currently working for a customer, who implemented the XML DB functionality in a new system. The total amount of XML data is roundabout 200 Gb. The XML data is split-up in 4 tables, 2 tables containing an XMLType column (XML Schema based, CLOB storage) and 2 XMLType tables (XML Schema based, Object Relational storage).

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