Re: recreable/freeable chunks

Thanks for all guys

Syed

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Tuesday, January 06, 2004 7:09 PM

Hi!

I wrote about recreatable chunk handling from memory and mixed up chunk freeing routines and chunk's data recreation routines: A callback routine is used when a process wants to free a recreatable chunk -> it can't reuse it just like that, because the original allocator (parent object) still has pointers pointing to this chunk, so the same object who allocated the chunk, has to do the freeing as well. That's my understanding, it'd be interesting to know whether it's correct ;)

Tanel.

> Recreatable:
> This chunk is used, but its contents can be regenerated if needed (such
are execution plans for cursors for example), thus Oracle can automatically reuse these chunks for others (of course when these chunks arenīt in use, thus unpinned). So when this information orignially stored in recreatable chunk is needed again, a callback function is executed, to recreate the contents in a chunk - callback functions containing instructions to recreate the information are registered for each recreatable chunk in heap manager's area if I recall correctly...)
> Information about unpinned recreatable chunks are held in heap LRU lists.

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Author: Sultan Syed
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