Re: Cache hash chains
- From: "Jonathan Lewis" <jonathan@xxxxxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 4 Mar 2015 10:42:33 -0000
You have four copies of one data block.
Each copy has an associated buffer header/handle (v$bh entry) that points
to it through the BA value
The 4 buffer headers are on a linked list called a "cache buffers chain".
That specific chain MAY include buffer headers for copies of other data
blocks
The starting location for each cache buffers chain is protected by a "cache
buffers chains" latch
Each latch protects many (typically 32 to 128) cache buffers chains.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com/all-postings
Author: Oracle Core (Apress 2011)
http://www.apress.com/9781430239543
----- Original Message -----
From: "Paul Harrison" <cure@xxxxxxxxxxxxx>
To: <contact@xxxxxxxx>; <oracle-l@xxxxxxxxxxxxx>
Sent: Tuesday, March 03, 2015 10:39 PM
Subject: RE: Cache hash chains
Hi Stefan,
I see now... So, the BA(Address of data block buffer) is the address of the
data block. In this case, I have 4 data blocks and each data block has a
buffer header(linked list) associated with it?
Thanks,
Paul
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