Hi Steve, Thank you for your explanation, but I got few additional questions ig you got a chance to answer:
> (There are similar X$ interfaces for other memory heaps). As you may know, > heaps are implemented as a heap descriptor and linked list of extents, and > within each extent there is a linked list of chunks. So what is done is that Is there a linked list for *all* chunks in a heap as well, regardless of their type, or is there only a list for each type of chunks, free and recreatable ones? Am I correct that permanent chunks don't have to be in any list because they're never deallocated and they should stay in same place anyway? > Some "X$ tables" have become "X$ interfaces" in recent versions, for example > X$KTCXB and X$KSQRS. These correspond to the transactions and enqueue > resources arrays respectively. The reason is that they are no longer fixed > arrays. Instead they are "segmented arrays" that can be dynamically extended > by adding discontiguous chunks of shared pool memory to the array. The > freelists and latching for these arrays in unchanged however. All you will > notice is that the ADDR column of the X$ output now returns addresses which > map into your PGA rather than the SGA. In fact, that is in general a good > way to work out whether you are looking at an X$ table or an X$ interface. I've noticed that some tables such x$ktcxb and x$kturd return the same ADDR value for all it's rows. I've always thought, that it means a subroutine or function is returning the results instead of a direct read from array, as you described. But x$ksqrs does return different ADDRs for each row (9.2.0.4 on W2K). Am I on wrong tracks here? Thank you! Tanel. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Tanel Poder INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
