Coskan’s Approach to Oracle

November 3, 2009

Oracle 10g/11g Data and Database Management Utilities by Hector R Madrid

Filed under: Book Reviews — coskan @ 4:29 pm

Two months ago I got mail from PACKT Publishing to review Oracle 10g/11g Data and Database Management Utilities by Hector R Madrid under their free blogger review program.  Initially, I promised to finish it by beginning of October, but due to personal reasons, I can only finish it by today.  Till I do my review,  Hemant K Chitale and Anantha Narayan from  Oracle blogosphere  already mentioned about the book in their blogs so you can go and check their opinions as well (able to find different opinions, before buying something is definitely a good option)

After marketing and excuse section, now it is time to review the book,

This book promises us to learn (taken from the back cover);

  • to optimize time-consuming tasks efficiently by using Oracle DB utilities.
  • perform data loads on the fly and replace the functionality of the old exp/imp utilities using data pump or SQL*Loader
  • boost defences with Oracle Wallet
  • Improve Performance of  RMAN backups
  • Perform  more than just ETL process by taking advantage of the External Tables feature

Can it keep it’s promise ? I think  Hector did very well about keeping his promise.

I liked the way he wrote the book, it is again very well organized with very simple easy to understand language. (If you have read my old reviews probably you already know that, I like the books I can finish, so in my opinion a good book must be a page turner as well as being technically satisfactory)

Who should have this book ?

There is already a who is this book written for on the back cover but  I have to add some words on top of it.

If you don’t like to read Oracle Official Docs very much, if you can easily get bored or lost during your official docs journey and you want to have a reference on your desk about available Oracle Utilities, this book is definitely written for you.

If you are DBA at the same place more than 5 years (where things are stable enough) and started this job with version 7 or 8  and due to the nature of your company or yourself you don’t have to learn new things that much and can still pay your mortgage  this book is a MUST  for you.   At least you can ease your life, save gazillions of  time and look wiser to the new junior  DBA when you can able to compare exp with data pump because if you can’t do it they wont trust your experience at least I don’t. Market is very tight and this book gives you enough knowledge to cope with market conditions.

If you are a junior DBA who doesn’t know where to start Oracle Utilities, I strongly recommend  this book  for your personal development.

Do I happy to have the book ? Sure I do. I did not learn new things that much but it worth reading for just couple of tips and tricks and learning some of the topics I have no experience on.

Now,  is the time to go over the summary of topics. (What Hector did was he tried to cover every topic with average 30 pages and enough screenshots and code samples this make book easy to read and avoid boredom of long topics. )

1-Data Pump: This topic is well covered. There is  enough information for started. I wish Hector covered the compression and encryption options of 11G, with examples.  I liked tuning Data Pump performance section where he covers factors other than parallelism which affects datapump performance.

2-SQL*Loader: I have to confess that SQL*Loader is something very old in Oracle but I am kind a  new for it because I never needed to use it at job so my knowledge was depending on  simple tests. It was very nice to learn what it is capable of with loads of examples.

3-External Tables: I love and used external tables very much for mostly data and this section brought new areas of usage to my knowledge like reading listener and alert log via external tables.

4- Recovery Manager Advanced Techniques: I think this topic is named wrongly because when you see advanced you expect more but I did not get that much. It basically covers what RMAN can do instead of your old manual backup techniques. If you already an RMAN user  and don’t know the new feature called faster backups through intra-file parallel backup restore operations in 11G  it will be a good learning for you.

5- Recovery Manager Restore Recovery Techniques: This is the second part of  RMAN managed backups which is RMAN managed restore recovery. Nothing  new for me and I have to say TSPTR which is the most important feature is missed.

6- Session Management: Overall session monitoring  for wait and lock analysis is covered with addition of resource manager. Old school boys will definitely find something new in this chapter.

7- Oracle Scheduler: This chapter can convince you to use this tool more. Job Chains  should be covered with a little detail I think.

8- Oracle Wallet Manager: This chapter was new to me and probably new to most of you. I can say that is a good introduction to Oracle Wallet Manager.

9- Security Management: Again good introduction for encryption options available in Oracle. It is mostly practical usage of previous chapter.

10-Database Configuration Assistant: I use DBCA very much and this chapter was a bit fast reading but it is a must for guys who are not aware of what this tool can do other than creating a DB.

11- Oracle Universal Installer: Basically, Hector tried to mention that this tool is not just doing next next next. Cloning Oracle home using OUI was a new learning for me.

12- Enterprise Manager Configuration Assistant: There are nice tips and tricks about emca troubleshooting.  You will like this topic if you have problems with this tool and don’t know where to look.

13-Opatch: This chapter is very well detailed and it adds Enterprise Manager usage for opatch utility.  A must read for the ones who use opatch when applying patch.

Biggest problem of this book is lack of references. I really don’t like something without references. The author cannot know them by himself,  he should have learned them from somewhere and it would be very nice if he shared them with us too so the book can point the users to the right directions to finalize their journey about utility they look for.

Well that’s about it.  I want to thank PACKT Publishing for free review option and Hector for this nice work.

If I can find time to read, Next Book review probably will be Practical Oracle 8i :Building Efficient Databases , which I finally got my copy of it and willing to read it asap. Luckily Christmas coming and it will be quite at work :)

September 10, 2009

Oracle Performance Firefighting by Craig Shallahamer

Filed under: Book Reviews, Diary, Performance — coskan @ 3:42 pm

Today I am going to write about an amazing book Oracle Performance Firefighting by Craig Shallahamer, which was released in July 2009. After all the papers I read from Craig, my fingers were crossed for the release date and I ordered the book for our company immediately after release.  The reason I was very excited about the book is that  I always feel uncomfortable with overall system performance tuning and this is the area where Craig looks  very good at.

During the review, I will try to cover what this book promises and gives us by going through  all the chapters one by one. For overall, this book is not for sql tuning  It is about how to find the problem and giving possible other solutions for common problems ( in addition to tuning your code as a first option.) by giving the information about how Oracle works in most problematic areas like buffer cache, shared pool, redo, undo and especially  latches and mutexes.

Before starting to go through chapters, I want to say that the book is very well organized  and the way Craig teaches avoids boredom about numbers and math.   I could not  leave the book even on holiday.  The way he covers the very hard to understand topics brings curiosity about the next topic.  One more thing is the number of usage of the word OraPub (his company) kept minimum.  While reading  Optimizing Oracle Performance by Cary Millsap and Jeffrey Holt, I really hated the word Hotsos because  it was nearly on every page and that was very annoying. If you are curious about this problem it is not happening that much in this book.

Lets start with going through chapters (Chapters with * are the ones that really needs attention)

1- Methods and madness: This is the introduction to how to be a firefighter from both methodic and holistic perspective. Craig gives information  What you need during Oracle firefighting and how you can build a methodology . He covers the basics of analysing the system as a whole under the name of  OraPub 3 Circle Analysis.  When I first read about the OraPub 3 Circle Analysis I did not expect much but after a few chapters I admit that it works quite fine.  Most interesting topic to me was how to write the summary of your firefighting story.  That is something I need to work on.

2- Listening to Oracle’s Pain: This chapter tries to explain how to understand what Oracle is crying for by using Oracle Wait Interface and ORTA (oracle response time analysis). It covers how Oracle kernel developers instrumented their code for creating Oracle Wait Interface. It wasnt something I did not know but still nice to remember most them.

3- Serialization Control (*): This chapter is where this book starts to rock about explaining what is going on in Oracle by telling how Latches Mutexes and Locks work and differ from each other.  After finishing this chapter I believed that the book already worth the money I paid and there were 6 more chapters to go. Craig definitely knows how Oracle works and better than just knowing he knows how to explain it like latches for dummies.  It is really hard not to remember or not understand what he is explaining.

4- Idenfying and Understanding Operating System Contention: This chapter tries to cover how to use unix/linux tool to gather information from operating system to do the operating system circle of OraPub 3 Circle Analysis. Apart from using tool it is very good about the way Craig teaches about how to talk and convince Network, OS and Storage guys in case of a problem without making their nerves. I personally liked very much the word Craig uses like “there is a memory pressure” instead of “paging” :)

5- Oracle Performance Diagnosis: This chapter is going deep into how to gather overall performance related data from Oracle and how to interpret the data you gathered without going to compulsive tuning disorder. He covers the wait event myths section which was very interesting and he tries explain why profiling is not “always” the best approach. Making the most out of DBMS_MONITOR  tool is also covered well. Craig also gives internals about ASH (Active Session History). How it works why it is good and how to use it. Craig also gives the simple trick about how to learn Oracle internals which is reading Oracle patents also search oracle in (http://www.faqs.org/patents/asnl/op).

6- Oracle Buffer Cache Internals(*): Till I read this book, I never dreamed  about that, one day I will really fully understand and be able to explain to others, how  Oracle buffer cache, shared pool and latches works, despite all official documentation and the books I read so far. This and upcoming 2 chapters  gave me this opportunity and I want to thank Craig very much for explaining these topics this well. Diagrams and way he explains are totally amazing.  Chapter is not just explaining buffer cache it is also how to tune it.  Knowing the internals of Buffer Cache can be the only reason to have the book because it is nearly the main thing for optimal performance. I really like too much about latch and enqueue subtopics.

7- Oracle Shared Pool Internals(*): This is another reason that makes this book unique.  I already wrote my own compilation about shared pool in a blog post but this chapter taught me many more things like lathes and mutexes in shared pool , In memory undo   and how to tune them. This chapter is also a must to learn to do proper performance firefighting.

8- Oracle Redo Management Internals(*): In this chapter Craig gives how redo management works in Oracle and how to tune redo related issues which is again very important performance related topic.  He goes over  every redo related problem and gives possible solutions to them. Learning the dangerous commit_write parameter usage was  completely new to me.

9- Oracle Performance Analysis(*): In this chapter every topic so far is integrated with each other in  a possible problem scenario. Before going into the scenario Craig cover response service and queue time calculations and prepares us to scenario. In this chapter Craig starts an Overall system performance tuning in OraPub three circle analysis by analysing Oracle OS and Application together. He goes into the analysis three times and this gives reader the clues when and where  to or not to stop tuning.  This chapter totally depends on math and to be honest it is really easy to understands

Now it is time to talk about what I don’t like about the book. Craig introduces and explains too many internal parameters and he gives them as an option in case there is a problem. I loved to learn them because it is very helpful when you talk with Oracle support and also they are part of understanding Oracle but I prefer he mentioned more about not to use them before asking Oracle . He says not to use them couple of times but still not enough to me.   Second thing is that we don’t  have option to download the test case codes Craig mentions apart from OraPub monitoring kit.  Third there is no index at the end of the book.Although I don’t use indexes that much but still nice to have.  One last thing because it is only available from OraPub you might wait a bit if you are ordering outside of US like me, I wish there was an e-book option which I always find it easy but probably it is because of avoiding pricy.

After negative part lets come to the conclusion. This book is very informative very well written and in my humble opinion, a must on every DBA’s desk and I suggest it to every DBA. If you are experienced and read too many performance tuning books and feel comfortable with performance tuning but still struggling to understand latches mutexes buffer cache shared pool  or overall performance tuning and if you want to fully understand them Oracle Performance Firefighting is totally for you. If you are a new for Oracle Performance Tuning,  this book is a must to understand how Oracle works but please be careful about hidden/unsupported parameters.

My only regret is not to order 2 copies one for company and one for me. :) I hope you will like the book as much as I liked.

Many thank to Craig Shallahamer for bringing  deep knowledge and experience about Oracle Performance tuning and sharing in this very special book.

May 20, 2009

TOP by Christian Antognini

Filed under: Book Reviews, Diary, Performance — coskan @ 4:29 pm

I finally finished “reading” of Troubleshooting Oracle Performance by Christian Antognini.

The book is already reviewed as a blog post by many other bloggers like Carry Millsap, Jonathan Lewis (they  also wrote forewords for the book), Jason Arneil and  Tonguc Yilmaz.

Now it is my turn to say something about this invaluable book.

First of  all this review is based on what I read because I read the book mostly when I am on train and I did not try %90 of what is written on the book yet. After I go over the book again and try all the scripts,  I will write more posts about the book which is going to be, what I learned from TOP by Christian Antognini series.

The book is  very well structured and ordered,  you don’t loose yourself by references to upcoming topics that much.  It is not written by a native English speaker,  so you don’t struggle with language,  it is simple and easy to understand as much as it can be.  Everything he explained is supported by a proof. The best part of this book among other two performance related bibles (Cost Based Oracle Fundamentals and Optimizing Oracle Performance which are also very much recommended) you never get lost from the math. I graduated as an Computer Engineer but sometimes I really struggle to understand where all those numbers come from when I look at the other books.   the way Christian explains the Math in TOP is very understandableand there is no way you can complain about too much math in this book.

Apart from all these general readability issues, TOP gives you a method for designing a better application and a method to solve most of the common problems on Oracle Databases.  It covers all available supported Oracle versions, so you also find chance to see the differences on Oracle Troubleshooting and optimal design from 9i to 11g.

What TOP doesn’t give,  is magic. If you expect magical internal ways for troubleshooting Oracle, this book is not right for you. You need to look other definitive books :)

Christian covered nearly everything ,  The only problem is that ,he doest give step by step approach like Tanel does. It would be excellent, if Christian add one more chapter and give step by step approach in case of a problem. Although Last chapter does something smilar , I still think it is a bit small.

I have a dream that Christian and Tanel work on a book together :) It would be great to have a  book which covers nearly everything you can face while troubleshooting Oracle. Coincidentally their masterclasses at UKOUG were one after the other and during reading this book I attended Tanel’s class,and I found the chance to compare them twice, My conclusion is,  I think their work deserves to be combined. Just a feedback from audience :)

Last word about this book it is excellent piece of work. I recommend it to everyone who wants to learn Troubleshooting Oracle Performance and optimal Oracle design for better performance.

Many  Thanks goes to  Christian for sharing his work with community.

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