Oracle-L: Re: what is meant by dirty buffers

From: <G.Plivna_at_itsystems.lv>
Date: Mon, 13 May 2002 04:03:23 -0800
Message-ID: <F001.0045F309.20020513040323@fatcity.com>

Working with FM

Oracle8i Master Index: D
press on DI
Looking for dirty buffers
found link dirty buffer (Concepts)

and here is an excerpt:

The buffers in the cache are organized in two lists: the write list and the least recently used (LRU) list. The write list holds dirty buffers, which contain data that has been modified but has not yet been written to disk. The least recently used (LRU) list holds free buffers, pinned buffers, and dirty buffers that have not yet been moved to the write list. Free buffers do not contain any useful data and are available for use. Pinned buffers are currently being accessed.

Gints Plivna
IT Sistçmas, Meríeïa 13, LV1050 Rîga
http://www.itsystems.lv/gints/

                                                                                                                                        
                      Abdul Aleem                                                                                                       
                      <dmit_at_beaconhouse        To:       Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>                    
                      .edu.pk>                 cc:                                                                                      
                      Sent by:                 Subject:  what is meant by dirty buffers                                                 
                      root_at_fatcity.com                                                                                                  
                                                                                                                                        
                                                                                                                                        
                      2002.05.13 14:43                                                                                                  
                      Please respond to                                                                                                 
                      ORACLE-L

Hi,

In a book I read that DBWO writes dirty data buffers from data buffer cache to the data files. I would appreciate if someone could kindly clear my confusion.

What is meant by dirty data buffers? If these are dirty (not good/healthy) why to write to these to data files?

TIA! Aleem

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Received on Mon May 13 2002 - 07:03:23 CDT