Apps clone is like cloning a human being. Please read the detail below.

1) Run adpreclone on DB/CM/AP tiers

This is pre-requisite step of cloning 11i prod and will not change anything in any system. This script will only create on $COMMON_TOP, a directory called "clone", with a basic structure of executable, scripts, templates and java files.

An age old problem with SQL is pagination through a row set. You want to display rows one page at a time, in some sort of order. The issue is architectural: SQL is a set oriented language. It deals with rows as a group, not individually, making it impossible to paginate through a set because that would require navigation from row to row. There are work arounds, there are potential programming bugs, and there is a Database 12c New Feature: the row limit clause. All demonstrations below are done with 12c final beta, release 12.1.0.1.0. Below is the old and the new way, with a bit of reverse engineering.

12 MArch 2013 update: Content removed - it exceeded what is permitted for the pre-release status of the product.
Sorry about that, will repost when I can.
JW.

I recently did a comparison caching mechanisms of scalar subquery caching(SSC) and deterministic functions in 11.2. Unfortunately, I do not have enough time to do a full analysis, so I will post it in parts.

Today’s topics:
1. Both mechanisms are based on hash functions.(About hash tables and hash collisions for scalar subquery caching excelent wrote Tom Kyte and Jonathan Lewis(“Cost-Based Oracle fundamentals” chapter 9))
2. Deterministic caching depends on fetch size(arraysize) – results cached only within one fetch call, ssc has no this limitation.
3.

A 12c new feature that may have significant performance and scalability implications is the multithreaded database. All releases of Oracle below 12.x (and 12.x by default) run on Unix in a multi process model. The various background processes (typically at least fifty for 12c, thirty or forty for 11g) run as separate operating system processes. Furthermore, the dedicated server processes that support sessions also run as separate operating system processes. An Oracle instance will usually be running as hundreds (perhaps thousands) of processes. The multithreaded database changes this.

12 MArch 2013 update: Content removed - it exceeded what is permitted for the pre-release status of the product.
Sorry about that, will repost when I can.
JW.

Oracle Database 12c: New Features – Pluggable Databases by Michael Rajendran

Introduction

Oracle has leap forwarded the middleware technologies especially the database technology into the cloud. So far Oracle has been the traditional RDBMS database suitable for the private enterprise data centers within corporate walls.

The COST column cannot be used to compare execution plans. Punkt.

Hi,

We all know that CHAR and VARCHAR2 are two different datatypes used for storing strings in Oracle. When I asked many people about what’s the difference exactly, all were saying VARCHAR2 can be used for variable sized character strings. As I’m not satesfied with the answer, as always, I’ve decided to do my own experiments on these two.

Hi Geeks,

When I was doing a research on Oracle Database creation, through DBCA, last week, I came across a very interesting scenario which I couldn’t stop sharing with you :)

I have a cluster of machines (don’t confuse it with a RAC cluster but just a group of machines required for my application deployment) with 11.2.0.2 installed and a Database instance running.

I got a requirement to remove everything accumulated in the machine as a result of the Oracle installation and the Database creation: The installation directories, the datafiles, oratab entries etc…

After removing all th

Hi Oracle geeks,

Last Friday, I’ve noticed a strange thing happening in my 11.2.0.3 Database: I’m able to create objects in a tablespace which is marked READ ONLY !!!

Don’t believe this??

I have just joined an in flight project and find the lead data modeler has created a name value pair data model.

The reason given was flexibility of data model considering some records can have as many as 900 attributes. The .Net application team seem to be loving it, as they can code everything with very few tables in mind.

I feel the model is difficult to query, difficult to load and difficult to syndicate and in all likelyhood will suffer from poor performance.