Getting started with Oracle Database 12c Multitenant Architecture

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Oracle database, since its inception, has always used a very specific and unique architecture which served it very well. In earlier forms of this architecture, all components of the database were meant to work in a one-to-one mapping with each other. But from version 12c onwards, a completely new architecture has been introduced – Oracle Multitenant. In other words, from… Continue Reading →Read more
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Understanding SQL Query Parsing: Part 4 – Understanding Bind Variable Peeking

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In the 3rd part of this series, I introduced you to the concept of the bind variables. We also learned their importance in regard to cursors, i.e. how with the presence of bind variables, cursor reparsing can be reduced significantly. But as is famously said in the world of performance tuning, there is nothing black or white: it’s all grey…. Continue Reading →Read more
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Understanding SQL Query Parsing – Part 3: Bind Variables and Cursor Sharing

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In the first and the second parts of this series, we learned what query parsing is, how hard and soft parsing work, what their impact on the query is, and then moved on to understand the concept of parent and child cursors. In this third article, we will look at the issue of duplicate SQL statements and how Bind Variables… Continue Reading →Read more
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Understanding SQL Query Parsing – Part 2: Parent and Child Cursors

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In the first article of this series, we learned what query parsing is and what impact it has on query performance. In this part of the series, we shall continue the discussion and look at Soft Parsing of the query. Query Processing Workflow Revisited As we saw in the previous installment, a query has to undergo Hard Parsing at least… Continue Reading →Read more
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Understanding SQL Query Parsing – Part 1

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Introduction When it comes to tuning a badly-performing query, there are many things that need to be checked. There may be poor query design causing the query to run slowly. There could be an issue with the underlying hardware such as CPU or IO which is bringing the performance of the query down. There could be stale statistics or missing… Continue Reading →Read more
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GoldenGate – An introduction

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In the last few years, GoldenGate has become the preferred choice for DBAs to handle the replication requirement of their data centers. Besides being extremely easy to configure, GoldenGate offers immense flexibility in the configuration strategies available with it. This series of articles will discuss GoldenGate technology, covering concepts, configuration options, troubleshooting and so forth. The Scenario Imagine you are… Continue Reading →Read more
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RAC One Node

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In the past few years, technology has become a very important aspect of our lives. There isn’t any moment when we are not connected to or using technology and this is not to do some core geeky stuff but for the tasks which have become a part of our lives. Can you imagine a day when you are unable to connect to… Continue Reading →Read more
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An Introduction to 11.2 RAC Server Pools

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Oracle RAC is designed to cater for Oracle specific applications and also non-oracle applications. These applications, both Oracle and non-Oracle, when deployed on RAC, are termed as resources and Oracle RAC can manage both kinds of resources on the clusterware stack. Examples of both oracle and non-oracle resources are: database instance, database services, xclock, Apache etc. The traditional way to… Continue Reading →Read more
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