When is an index access path better than a full table scan?


The cost based optimizer makes decisions that can be hard to understand. One of the hardest may be why it chooses indexed or scan access paths: a burning question for many DBAs.

Selenium Webdriver Online Training with Java Tutorial


Selenium WebDriver is a website robot framework that allows you to implement your assessments against various windows, not just Opera.

Selenium WebDriver also allows you to make use of a coding language in developing your examination texts (difficult in Selenium IDE).

It's simple to employ conditional operations like if-then-else or change-event
You can also accomplish looping like do-while.
Following development languages are recognized by Selenium WebDriver:

What is DB Time? Where has it gone?

DB Time is the time spent by the database server executing user calls. What is this composed of? CPU time, waiting time, and IO time.

Windows Registry - ORACLE_SID


Hi All,

I would like to share something about ORACLE_SID registry parameter.

I had a chance to restore (RMAN) a database on a new Windows server. The restoration/recovery was completed and there was no issue in logging to the database from the server.

The only thing I had to do was to set the ORACLE_SID variable everytime using the statement "set ORACLE_SID=abcd". I will encounter the error "ORA-12560: TNS:protocol adapter error".

Proxy authentication


Proxy authentication has been around since release 9i, but it isn't widely used. It can be a very useful facility for giving certain users access to high privileges without having to give them any direct grants or roles, and avoids many of the problems of using shared accounts. It is of course fully audited.

Standard Edition release licensing...


Standard Edition release is now available. Download it from the usual locations. But along with the great news, comes some news that is not so great: the licensing model has changed.

ADVANCED table compression: an improvement


Following previous blog re BASIC compression, here are a couple of simple tests with Advanced Compression - which is supposed to survive conventional DML.

BASIC table compression: use with care


BASIC table compression is included with Enterprise edition, and can achieve respectable compression ratios. But beware! Subsequent DML may be disastrous.

Controlling Administrator Access with Oracle Database Vault “Separation of Duty”

This paper provides best practices for rapid deployment of Oracle Database Vault protections to
secure sensitive application data inside the database. Oracle Database Vault enables you to restrict administrative access to an Oracle
database. This helps you address the most difficult security problems remaining
today: protecting against insider threats, meeting regulatory compliance
requirements, and enforcing separation of duty. It covers the following main topics:

How and why to quiesce the database


The ability to quiesce the database was introduced in release 9, but to this day I find that many people are not aware of it. It can be really useful - so let's describe it. I'll begin by positioning the quiesce capability: when is it useful. Then detail how to do it, then reverse engineer the mechanism.


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