SELECT statement Processing in an Oracle Database - DBArch Video 7 

"If you can't explain it simply, you don't understand it well enough" ... You have explained simplest of all .... You understand it perfectly. The auditorium is happy to follow such great videos for Oracle.

This video is the most helpful and concise video on SQL execution. Thanks man

Best teaching ever seen unbeleivable!!!!! May GOD guide you to the truth about HIM. It is the best gift someone can get in his life.

I have attended core dba in multiple institutes and noone is not as clear as you. Your way of explanation is so easy to understand and concepts are explained very clearly...keep up the good work

Best explanation I ever seen..I was searching for right guide for oracle and I found it..Thanks for your effort..We are expecting more videos.

Everything is nice. Presentation, Technic, Explanation. May god bless you.

Sir!! I salute you... you know what you are teaching, congratulations

You are the best of all...My heart satisfies with ur explanations with valid reasons that u provide..please make the practical scenarios also for all ur videos ...and also please make the videos on Oracle Apps DBA with practical scenarios..

Excellent explanation. Thank you🙏 sir.

Thank you very much for explaining the subject of oracle in a way that everyone can understand.

Very clear and simple, easy to understand explanations for the concepts. Awesome sir. I was searching for these concepts in youtube like anything, fortunately, I found your videos.:))

Really, very nice explanation... You explained such a complex stuff in a very simple manner.. Thank you Sir :)

Hi Sir , Thank you for all your valuable time & energy for making the videos on the oracle Dba and sharing the knowlede. Request:Please make a video on Multitenant Architecture in 12c . Thanking you in advance.

Hi Ram. How are you? Glad to see you on youtube. Had attended one of your fabulous sessions in Dubai a few years ago. Greetings!!

Best explanation Sir. _/\_ I was looking for a proper guidance on this. The way you explain every details seems so easy. Thank you.

Sir ji thanks a lot. You are beyond best. I don't have word to adjectify you. Namaste

Best teacher ever... God for dba folks

Thank you sooo much, superbly explained and understood. Regards, Sujaa

it's Very Good Videos. explained in simple method. thanks

SUBSCRIBED YOUR CHANNEL🙏 I'm pretty feeling comfortable listening to your classes. Thank you sir.

Short and informative video

Nice Sir...Thank you very much your help...

nice background music but pls reduce the volume , sometimes its overlapping your voice. Nothing we can say about your teaching skills.hats off

I have watched all your series and i really like your style of teaching. Can you do a video series on Postgresql

Amazingly explained sir

Sir, Thank you for this nice video.Very well explained. I have a doubt what will happen if the buffer cache is smaller than the table size. Will it get loaded in the memory? Thanks

Thanks you very much. This is very helpful.

Thank you so much ...please upload more videos on RAC.and advanced technologies

all the videos are very helpful, Thank you so much sir if you have any Rac Dataguard ASM Videos Link please ?

Good explanation ...DONE...

Hi Sir, Your Explonation is very well and I have one doubt which background process will read data from database and read into the DBcahche.

Thank you sir

Best explanation, it would be even more better if that disturbing background music wasn't included.

when and where is the hash number for your SQL statement created before the database does the shared pool check for a shared area with an exist sql ID? Thank you

When soft parse and hard parse will execute?

Sir as you said hash is generated again for the same statement on next execution meanwhile oracle documentation says its unique for the same statement because this hash is searched out in shared sql area to avoid a statement from being pasred again on next execution. Please correct where I'm wrong to understand about hash.

that is awesome thanks a lot...but one question i have is at the time the blocks are send to the buffer cache to process and give data to the app or user. the question is where is the app or user viewing the info ??? is it from the app which the data was send from the server to the app or the app is in the database getting data in the instance still. meaning the process that the app is doing with the data its send back to be updated on the server or instance. they where all processing from the instance all along. so the processes are internal in the instance?

Excellent Tutorial

Thank you for making this video sir. A few questions, For how long will an SQL-Area for a corresponding Query be stored in the Shared Pool before it is decided to remove it? For how long will the Data files blocks be stored in the Buffer Cache before it is erased? How would this work for queries involving sub-select statements(ex - select * from Emp where Emp.id in (Select id from Managers...))? I'm assuming the Parse-Execute-Fetch process is done on the sub-select statement before the result is returned as a DataFile Blocks to the outer select statement. Correct me I'm wrong.

very best explanation (Y)

Hi Ramkumar, How to get the details of sql query from server side. Note: database max number of processes reached. So, we need to kill some of the queries

Good overview. Thank you. What happens when a hash is generated and later there is a change in DDL? will the hash be deleted and goes for another hard parse?? Example : 1. hash created for select empid from emp; 2. Query executed and result returned. 3. Ddl executed to drop empid column 4. Reissue the same command.. When step 4 executed hash would be same as step 1.. So it should ideally go for soft parse but how this scenario would be handled.??

Thank you for your excellent video. I have a question: "How does oracle find table blocks in datafiles ? If table exist in buffer cache, how does oracle find it ?" Thanks.

You are the best :) :) :)

Okay syntax and semantics cleared…. doesn’t this privilege check also actually comes under semantic checks legally? I mean u can make anything but still… I think semantics is about the legal validity...and privileges is one of them I suppose. Anyway doesn't mean much if in oracle u do things like that but was jus curious. :)

You are Amazing

Hi Sir, Kindly upload a video of " HOW TO CHANGE PLAN HASH VALUE OF A QUERY IF IT TAKES BAD PLAN HASH VALUE INSTAEAD OF REGULAR " and explain it if any impact on execution query.

Hi, can u explain please hard parse and soft parse

Thanks a lot but where is the usage of result cache?

Hi Sir, are you giving any online training if yes can you please share the details Thanks

Sir what is the future of pl sql

Thanks

Respects

unable to concentrate due to background music in the video even though you explained it nice

Tq

Kindly remove background score its a distraction

Thank you Sir