the public newspaper stamps

Hi all

Is it true that 10 g, we have at least two buffers of the public newspaper, if we have more than one CPU?
Is there some way (see), we could use, to check the actual number of stamps from the public journal (without using the redo log dump)?


Best regards
D.

Since the account is SYS:

select
        indx,
        FIRST_BUF_KCRFA               ,
        TOTAL_BUFS_KCRFA              ,
        STRAND_SIZE_KCRFA
from
        x$kcrfstrand
/

      INDX FIRST_BUF_KCRFA  TOTAL_BUFS_KCRFA STRAND_SIZE_KCRFA
---------- ---------------- ---------------- -----------------
         0 070000001B8ED000            46979          24053248
         1 070000001CFDD600            46979          24053248
         2 070000001E6CDC00            46979          24053248
         3 07000017787BC000              249            132096
         4 07000017F84B7000              249            132096
         5 0700001768685000              249            132096
         6 070000175830B000              249            132096
         7 0700001748BE8000              249            132096
 

You can see the address of first is different from the rest - this shows you the public strands are located separately from the private strands.
You can also see the public strands in this system are about 24 MB each, while the private strands are 128KB. (There are many more private elements, incidentally).

Another detail, though - there are features that disable private redo thread, what RAC is the most obvious example.

Concerning
Jonathan Lewis
http://jonathanlewis.WordPress.com
Author: core Oracle

Tags: Database

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