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Database Feed

Oracle Database, Oracle 10g, Oracle 11g, Oracle XE, Oracle RAC, Oracle Instant Client, Oracle Data Guard and Oracle Exadata resources, news, and support articles.

Indexing Points to Remember

Indexing depends upon the queries in the application.

There is no one-size-fits-all break-even point for indexed versus table scan access. If only a few rows are being accessed, the index will be preferred.

If almost all the rows are being accessed, the full table scan will be preferred. In between these two extremes, your “mileage” will vary.

Minimal Downtime Cross Platform Migration and 12c Database Upgrade using Data Guard

This note describes the procedure used to perform a minimal downtime platform migration from Windows to Linux as well as a database upgrade from Oracle to Oracle 12c (

We create a Data Guard physical standby database using the DUPLICATE FROM ACTIVE DATABASE feature, followed by a switchover and then we activate the standby and make it a primary database. Finally we upgrade the database to 12c using the perl utility with the parallel upgrade option.

Find it. Fix it. Real-World SQL Tuning Cases - Jan. 13 Webinar Followup

If you missed my January 13th webinar entitled "Find it. Fix it. Real-World SQL Tuning Cases" you can now access the recording and download the presentation file using the following links.

Presentation PDF
Webinar recording

Non-CDB Architecture Is Officially Deprecated….

Yeah, it’s indeed true and official. So if you still haven’t started reading and learning Multitenant architecture introduced in and enhanced in, it’s high time that you start doing it.

X-PLANE Flight Simulator Home Edition

Here is my story about the  flight simulator called X-PLANE. I would like to share my experience about this flight sim, my desktop’s hardware specification,  controllers that I’m using, and application settings for an optimal performance.

RHEL6 udev and EMC PowerPath

I’m working on Oracle database migration project where customer have chosen commodity x86 hardware with RHEL6 and EMC storage.

In-memory DB

A recent thread on the OTN database forum supplied some code that seemed to show that In-memory DB made no difference to performance when compared with the traditional row-store mechanism and asked why not.  (It looked as if the answer was that almost all the time for the tests was spent returning the 3M row result set to the SQL*Plus client 15 rows at a time.)

Migrate Data from SQL Server to Oracle

This Post will describe how to migrate data from SQL Server ( different version ) to oracle using SQL DeveloperYou can read it from hereCheersOsama 

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