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Oracle Tips 

by Burleson Consulting

The Data Warehouse Development Life Cycle

SQL*Net For Oracle Distributed Data Warehouses

You can use database links to allow applications to point to other databases without altering the application code. For data warehousing applications, you can replicate a table on another machine and establish links to enable the application to point transparently to the new box containing the replicated table.

To see the links for a database, query the Oracle dictionary, as follows:

SELECT DISTINCT db_link FROM Remote DBA_db_links;

Keep in mind that SQL*Net bypasses all operating system connections when it connects to a database. All externally identified user accounts (that is, accounts without an Oracle password) will not be allowed in SQL*Net transactions unless the init.ora parameter is changed. The identified externally clause (OPS$) in Oracle version 6 allows the operating system to manage passwords, but because SQL*Net bypasses the operating system, impostor accounts can be created from other platforms. The result is that security can be bypassed. Consequently, Oracle now recommends forbidding externally identified accounts when using distributed connections, and the OPS$ features is seldom used in Oracle7 or Oracle8.

It is interesting to note that Oracle will allow you to create accounts with an OPS$ prefix. Therefore, the operating system can manage its passwords, while you also have passwords within Oracle. For example, assume the following user definition:

CREATE USER ops$scott IDENTIFIED BY tiger;

Assuming that Scott has logged onto the operating system, Scott could enter SQL*Plus either with or without a password, as follows:

sqlplus /
sqlplus scott/tiger


This is an excerpt from "High Performance Data Warehousing".

If you like Oracle tuning, you may enjoy the book Oracle Tuning: The Definitive Reference , with over 900 pages of BC's favorite tuning tips & scripts. 

You can buy it directly from the publisher and save 30%, and get instant access to the code depot of Oracle tuning scripts.

 


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