Re: Logical Logs -Explain

1) =20 A foreground write is what happens when a thread can't find an unused=20 buffer, so it initiates a write, instead of waiting for the page=20 cleaners=2E This will happen if you have a very small number of=20 BUFFERS, and/or your LRU_MAX_DIRTY and LRU_MIN_DIRTY are set too high=2E =20 2) =20 It just means that in theory, a modified page could be flushed to disk= =20 before the before image of that page gets written to the physical log=2E =20 Davin ______________________________ Reply Separator ____________________________= _____ Subject: Logical Logs -Explain Author: MIME {ssathish@getafix=2Ecmc=2Enet=2Ein} at INTERNET Date: 02/12/97 21:14 =20 Hi, Regarding Flushing of logs/buffers to disk=20 1)What is a FOREGROUND WRITE? =20 2) "If page cleaner activity begins and a modified page is writtn to disk=20 ,it would be possible for the modified version of the page to be on disk ,=20 but the before image to still be in the Physical logbuffer=2EAlso, if a use= r=20 thread initiated a foreground write on such a page , the same situation=20 could occur" What does the last sentence mean? Thanks, =20 ***************************************************************************= ***=20 S=2ESathish CMC Ltd=2E, Bangalore-INDIA=20 email :ssathish@cmcbang=2Eernet=2Ein ***************************************************************************= *** =20 =20 ********************************************************************** DST International Tel:+44 181 390 5000 www=2Edstinternational=2Eco=2Eu= k=20 This message and any attachments to it is intended only for the=20 individual or company to which it is addressed and may contain=20 information which is privileged, confidential or prohibited from=20 disclosure or unauthorised use=2E If the recipient of this=20 transmission is not the intended recipient, or the employee or agent=20 responsible for delivering such materials to the intended recipient,=20 you are hereby notified that any use, any form of reproduction,=20 dissemination, copying, disclosure, modification, distribution and/or=20 publication of this e-mail message or its attachments other than by=20 its intended recipient is strictly prohibited by the sender=2E =20 If you have received it in error, please notify us immediately by=20 telephone on the number above and destroy the message and all copies=20 in your possession=2E **********************************************************************