level-1 and levle-2 backup

Posted in 2011

CHUAN LU — Tue, 27 Sep 2011 07:07:40 — source: IIUG Forums & Mailing Lists

Hi, When IDS did level-1 backup ,How to identify which pages are modified after the last level-0 backup? Thanks for your time.

↪ replying to CHUAN LU

John Miller iii — Tue, 27 Sep 2011 07:45:16 — source: IIUG Forums & Mailing Lists

Every disk page has a what is called a timestamp on it. This is not a timestamp which keeps time, but rather a counter. Every time a page is updated the counter is increased. When an archive is started a checkpoint is done and the timestamp counter is saved off. To take a level 1 archive we scan all used disk pages looking for pages in which the timestamp is larger than the level 0 counter that was saved at the archive checkpoint. John F. Miller III STSM, Embedability Architect miller3@us.ibm.com 503-578-5645 IBM Informix Dynamic Server (IDS) ids-bounces@iiug.org wrote on 09/27/2011 12:07:48 AM: > From: "CHUAN LU" <luchuan@cn.ibm.com> > To: ids@iiug.org > Date: 09/27/2011 12:08 AM > Subject: level-1 and levle-2 backup [25038] > Sent by: ids-bounces@iiug.org > > Hi, > > When IDS did level-1 backup ,How to identify which pages are modified after > the last level-0 backup? > > Thanks for your time. > > > ******************************************************************************* > Forum Note: Use "Reply" to post a response in the discussion forum. >

Glossary

IDS (Informix Dynamic Server)