Many thanks to all those came to attend my two sessions "The Art and Craft of Tracing" and "Profiling for Performance in PL/SQL" at New York Oracle Users Group meeting on July 29th. Here you can download the presentations as well as the scripts I used for the demos.Presentation: TracingPresentation: ProfilingScripts for both Tracing and Profiling sessions.
As always, your feedback will be highly appreciated. Do write to me about (more...)
I don’t usually write about specific products; but once in a while I encounter something worth talking about, especially if it addresses a very common issue anyone with datacenter management responsibilities will understand: avoiding the unavoidable loss of last minute data changes in database after a disaster but without expensive synchronous replication. This product solves that problem with an innovative out of the box approach. The product is Phoenix Systems from Axxana.
Replication and Last (more...)
For all those who attended my session today in Oracle Virtual Technology Summit on InMemory, thank you very much. Some questions were cut off towards the end since it was an automated session. I will be happy to answer, if your question was in that category.
Since this was an on-demand show, you can watch the replay anytime by visiting this site
. Remember, this requires a connection to watch; it's not a download. You can (more...)
You must have seen sessions waiting on the event “latch: cache buffers chains” from time to time. If you ever wondered what this means and how you can reduce time spent on it, read on. Here you will learn how buffer cache works, how Oracle multi-versioning works, how buffers are allocated and deallocated, what hash chain is and how buffers are linked to it, what the role of cache buffer chain latch is and why (more...)
A big thanks to all those who braved attending my session on the final day of Oracle Open World 2014. I hope you enjoyed it and found it valuable.
You can download the slide deck as well as the scripts I mentioned here
As always, I would love to hear from you.
Thank you for attending my session RAC'fying Multitenant at Oracle Open World 2014. You can download the slide deck here
As always I would love to hear from you.
Many thanks to all those who attended my session "SQL Tuning without Trying" at Oracle Open World 2014 #oow14. I hope you found the session useful.
If you want to download the slide deck, here
it is. As always, I would really, really like to hear from you.
Thank you all those who attended my session Cache Fusion Demystified.
As I mentioned, it was impossible to fit in a demo within that compressed 45 minute timeline. I put the details of the demo
in a separate file with all the scripts and instructions that allows you to execute the demos at your own site.Download the slide deck
as well as the scripts. In addition I have also written a whitepaper
to explain (more...)
Thank you all those who came to attend my session "Demystifying Cache Buffer Chains Latches" at Oracle Open World 2014. Much appreciated. I hope you got something out your time investment.
I have also written a paper to accompany this session. The paper explains the concepts I presented in greater detail. You can download a zip file containing the slide deck, the paper and the scripts here
. Please note: this is a zip file.
Thank you to all those who stayed back quite late that night for my two presentations. I hope you found it informative and useful.
As promised, you can download the session materials here.
As always, I will be honored to hear from you.
Oracle Scene (the publication of United Kingdom Oracle Users Group) has published my article "Hadoop for Oracle Professionals", where I have attempted, like many others, to demystify the terms such as Hadoop, Map/Reduce and Flume. If you were interested in Big Data and what all comes with understanding it, you might find it useful.
A PDF version of the article can be downloaded here http://www.proligence.com/art/oracle_scene_summ14_hadoop.pdf
Thank you for all those who attended my session: Understanding Oracle Locking Internals today at the Summer 2014 conference of New York Oracle User Group in Manhattan. You can download the presentation and the scripts I used in demos here.
As always, your feedback will be highly appreciated.
You have lost the controlfile
, the catalog
and the backup to the controlfile
too; so restoring the controlfile from a previous backup is not an option. How can you recover the database? By creating the controlfile from scratch. Interested in learning how? Read on.
Here is a final thread to the blog posts I had posted in the last three days, about interesting situations faced by John the DBA at Acme Bank. In the (more...)
You lost your controlfile and the catalog. To restore the controlfile, you must know the DBID. Did you follow the advise to write down the DBID in a safe place? You didn't, did you? Well, what do you do next? Don't worry; you can still get the DBID from the header of the data files. Read on to learn how.
If you have lost your controlfile and the catalog database (or the database was not (more...)
Allow me to present the snapshot of a day from the life of John--the DBA at Acme Bank. On this particular day a database John manages crashed entirely and had to be restored from the backup. He takes regular (backupset) RMAN backups to tape. Since everything--including the controlfile--had crashed, John had to first restore the controlfile and then restore the database. The controlfile is always backed up with the backup database command. John was sure (more...)
Thank you for all those who attended the session, and braved it up to 10 PM. Much much appreciated.
Download the slides here
, and scripts I used for the demos here
As always, your feedback will be highly appreciated.
Thank you all for coming to my session Cache Buffer Chains Demystified at Collaborate 14, especially for sticking around for a geeky topic like this to the very end. Much appreciated.
I was not aware that I would not be allowed to use my laptop; so I couldn't show all the demos I so carefully prepared. Please download the scripts and execute them yourself.
As promised, here are the materials I used in the session (more...)
Thank you all for coming to my session "The Art and Science of Tracing" at Collaborate 2014. As I mentioned, I prepared a full session even though this is supposed to be a quick tip. I hope you enjoyed it and get the value from the full presentation deck.
You can downloadThe slide deckThe scripts
(this is a zip file. Right click and then Save As ...)
As always, your feedback will be immensely appreciated.
Thank you all those who attended my 8:30 AM session at Collaborate 14 "Should You Drop Indexes in Exadata" (Session 316). I will appreciate receiving your feedback and giving it on the IOUG website and mobile app.
Here are material I presented. I have the slides here; but I suggest you download the paper as it is more standalone in nature.SlidesPaper