Cache buffers DB, file Cache Redo, DBWR, LGWR and log and data files

Hi all Experts,

I m very sory for taking your time to a matter of very basic level. in fact, in my mind, I have a confusion about the DB buffer cache and the cache of log buffers
My question is in the DB buffer cache are three types of dirty, pinned and free i-e data. and in Sales, they are all changed data data and are willing to empty in DBRW. and then he write data files.

but again bufers also works for the CDC and all the changed data is temporaryliy chacheed bufers redo and the LGWR writes in the log files. and these data can be data are committed or not. and when the log switch is held, then it writes data to data files commited

My question is that if a log file may have committed data type and stop and when a log switch takes place then only the data are committed are transferred to datafiles, then where are the data no go?


If dirty pads also contain modified data so wath is the diffrence between the bufers and data log data incorrect.

I know that this can be funny. but I m maybe wrong abot the concept. Please correct my concept about this

Thank you very much

Kind regards

user12024849 wrote:
Hi all Experts,

I m very sory for taking your time to a matter of very basic level. in fact, in my mind, I have a confusion about the DB buffer cache and the cache of log buffers

The first thing we do not mention this newspaper stamp in the log buffer cache. It won't make a difference to even call it that, but you should stick with the term normally used.

My question is in the DB buffer cache are three types of dirty, pinned and free i-e data.

Correction, it is the States of the buffer. These aren't the types. A buffer can be available in all of these three States. Also, note even when you would select a buffer, his first PIN before it can be given to you. Apart from this, there is a type more State called instant capture buffer aka CR (coherent reading) buffer that is created when a select query arrives for a buffer inconsitent.

and in Sales, they are all changed data data and are willing to empty in DBRW. and then he write data files.

Yes, that's correct.

but again bufers also works for the CDC and all the changed data is temporaryliy chacheed bufers redo and the LGWR writes in the log files. and these data can be data are committed or not.

That is partially right. The buffer which is written by DBWR in the data file is a full buffer while in the log buffer, it is not the entire block that is copied. Oracle enters the log buffer called vector of change . It's actually the representation of this change that you made in the data block. It is the internal representation of the change that is copied into the log block and is much smaller in size. The size of the buffer of paper compared to the buffer cache is much smaller. What you mentioned about the writing of written data room again or not committed is correct. His transactional change that needs to be protected and therefore is almost always written in the restore log file by progression of the LGWR.

and when the log switch is held, then it writes data to data files commited

Fake! To the command log, Checkpoint is triggered and if I'm wrong, its called point of control of thread . This causes DBWR write buffers dirty this thread in the data file regardless of whether or not they are committed.

>

My question is that if a log file may have committed data type and stop and when a log switch takes place then only the data are committed are transferred to datafiles, then where are the data no go?

As I explained, it is not only the validated data are written to the file data but committed and not committed is written.

If dirty pads also contain modified data so wath is the diffrence between the bufers and data log data incorrect.

Read my response above where I explained the difference.

I know that this can be funny. but I m maybe wrong abot the concept. Please correct my concept about this

No sound is not funny, but make sure that you mix in anything else and understand the concept that he told you. Assuming that before understanding can cause serious disasters by getting the concepts clearly.

Thank you very much

HTH
Aman...

Tags: Database

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