Jul 16

OCM 11g Preparation - Use SQL Performance Analyzer

Performance Analyser is specially good when we are doing an Upgrade in our Oracle Version, so you can check the times of the queries before/after the change. But for OCM, only 11gR2 is required to study. So probably, we will face another type of changement, like: Parameter Change Optimizer Statistics Practice here creating a SQL Tuning …

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Jul 16

OCM 11g Preparation - Use SQL Access Advisor

As I said to the previous chapter, SQL Access Advisor is also related with the previous topic ("Use SQL tuning tools and features"), but was defined separately. This indicates that this it is also a very important and will probably be in the certification exam. Study it! SQL Advisor is another performance tool and can suggest improvements like: Indexes. …

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Jul 15

OCM 11g Preparation - Use SQL Tuning Advisor

SQL Tuning Advisor is a great tool. This item is related with the previous topic ("Use SQL tuning tools and features"), but was defined separately. This indicates that it is very important and will probably be in the certification exam. SQL Tuning will suggest you to: Create a SQL Profile Create an Index Gather Statistics Restructure SQL …

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Jul 15

OCM 11g Preparation - Use SQL tuning tools and features

This chapter is very very hard. Why? Because you can rephrase this as: "you need to know all the oracle tools that can help you improve the performance of something". So, what are those "tools" and "features". Well, there are a lot of them: First, the ones that have a specific topic already defined: SQL Performance …

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Jul 09

OCM 11g Preparation - Interpret execution plan

As the topic before, execution plans are another thing that just the practical experience will give you knowledge. Studying through docs is not a good approach to learn that, at least for me. After you get the basic concepts, try to check and understand what and why is happening. Study also: Creating Plan Table. Set explain from …

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