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virtual columns in 11g

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virtual columns in 11g
Oracle has supported stored expressions for many years, in views and function-based indexes. Most commonly, views enable us to store and modularise computations and expressions based on their underlying tables' columns. In more recent versions (since around the 8i timeframe), we have been able to index expressions using function-based indexes. Now, with the release of 11g, Oracle enables us to store expressions directly in the base tables themselves as virtual columns.

Grid Infrastructure and RAC: the cluster interconnect

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A necessary part of a cluster is the cluster interconnect: the private network between the cluster nodes. This component is critical for both reliability and scalability, and configuring it for fault tolerance and capacity is a matter of burning importance for the DBA and his System Administrator (not to mention the end users). One question is, should this be managed by the operating system or by Oracle?

Finding islands – 4 methods in Oracle

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Finding islands are classic problems in PL/SQL. The basic concept is that you have some sort of numbers, like these: 1, 2, 3, 5, 6, 8, 9, 10, 15, 20, 21, 22, 23, 25, 26. The islands problem involves identifying ranges of existing values. For these numbers, the solution will be as follows:
first_island_element last_island_element
1 3
5 6
8 10
15 15
20 23
25 26

Finding gaps with analytic functions

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Finding gaps is classic problem in PL/SQL. The basic concept is that you have some sort of numbers (like these: 1, 2, 3, 5, 6, 8, 9, 10, 15, 20, 21, 22, 23, 25, 26), where there’s supposed to be a fixed interval between the entries, but some entries could be missing. The gaps problem involves identifying the ranges of missing values in the sequence. For these numbers, the solution will be as follows:
START_GAP END_GAP
4 4
7 7
11 14
16 19
24 24

First, run the following code, to create tab1 table:


CREATE TABLE tab1
(

Oracle DBA interview Questions

So many fresher Oracle DBAs and intermediate Oracle DBAs are searching online Oracle DBA interview Questions but unfortunately they are getting older and theoretical questions about Oracle basics. If you will prepare yourself from those content then you might get trouble to crack technical interview.

DB12C installation

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http://myoracleproduct.blogspot.in/2013/11/installation-of-oracle-12c-database.html

Please find the installation steps for ORACLE 12C Database.

Blog consists of step by step procedure to install the 12C DB. Screenshots helps you to select the options easily through out the installation.

Get the hands on experience with installation and working with 12C database. So that you will get an idea of what is container and what is root and what is seed.

GoldenGate replication

I have tried the GoldenGate Software for data replication. I would like to share the steps to one who is really looking for Goldengate replication steps.

I feel its a simple if we think it is simple, If we think its complicated, it is really a complicated. Start with a mindset that you can achieve it.

http://myoracleproduct.blogspot.in/2013/11/oracle-goldengate-replication-oracle-to.html

Oracle 12c new feature: Flex Clusters, what they are (and what they are not)

I have seen articles that misrepresent a Flex Cluster, even this book Expert Oracle RAC 12c which is written by people who know better (Oracle ACE directors, an OCM, an Oak Table member) gets it wrong, because of a reliance on beta documentation.

12c Scheduler new feature: external_script jobs

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In earlier releases, running a shell script from the Scheduler was awkward. Oracle has realized this, and introduced a new job type in 12c that makes it simple.

How to generate your test case automatically

One often sees requests for test cases, typically when a user has a SQL performance issue. So many users appear to have problems with producing a suitable test case that Uncle Oracle provides routine to automate this. There are no longer any excuses for not providing a test case. Here is an intro to how to do it (code tested on 11.2.0.3 and 12.1.0.1).

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