Db_keep and recycle_cache_size need help!!!
Hi all,
I am trying to understand how the db_keep_cache_size and db_recycle_cache_size parameters are working as i know keep is used to retain the data block in the memory and recycle is used to eliminate the data block from memory( if i am wrong please correct me).
Questions:
1. Assume DB_KEEP_CACHE_SIZE=40MB and DB_RECYCLE_CACHE_SIZE=40M. if the buffer keep area got completely filled by the data blocks, what will happen now whether it will age out the old data block to allow the new data block or something else?
2. DB_RECYCLE_CACHE_SIZE how the data block getting eliminate from the memory?
3. what is the benefit of this two parameters?
In case if u have any examples how to stimulate this two parameter please share it. i am trying to learn what is the purpose of this two parameters doing in the database!!!!
Please advice me
Thanks & Regards,
Shan
Shan,
To answer your question, i opened google in two tabs; in first tab i just searched "db_keep_cache_size" and in 2nd "db_recycle_cache_size", definaterly i will get plenty of good links. I got below two great links by Sir Thomas Kyte :
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:10399270486889
http://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:23558719922648
Now your questions can be answered by yourself very easily, confidently and without errors. How? See :
Ans 1:
Followup April 14, 2005 - 8am Central time zone:
the default, keep and recycle pools utilize the same algorithms for aging blocks out.
they are just three separate regions, they could easily have been called "pool1, pool2, pool3"
The concept was
hot or normal objects in the default pool.
keep warm objects that might be getting aged out by some full scans or infrequently accessed block
in the keep pool.
put cold objects, things you access once and never again, maybe full scanned objects in the recycle
pool.
that way, the default pool handles "normal" stuff. the keep pool handles "stuff you would like to
have cached but was getting bumped out because it wasn't really hot, just warm". the reccycle pool
(which by convention would be kept small in size) would age blocks out really fast due to its small
size and these blocks would not cause the aging out of blocks from the default/keep pools.
This is all "by convention", they are just three pools. Their names are conventions.
Ans 2:See Ans 1.
Ans 3:unless you've identified a need to use them, don't.
And much more... just read and let us know your "current" doubts (if any).
Regards
Girish Sharma
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