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From: wlrush@water.waterloo.edu (Wenchantress Wench Wendall)
Newsgroups: ont.events,uw.talks,uw.cs.grad
Subject: MASTER'S THESIS PRESENTATION
Keywords: Ms. Yvonne Dubreuil, graduate student, Dept. of Comp. Sci., Univ. of Waterloo
Message-ID: <2819@water.waterloo.edu>
Date: 7 Dec 89 16:29:02 GMT
Distribution: ont
Organization: U of Waterloo, Ontario
Lines: 39


DEPARTMENT OF COMPUTER SCIENCE
UNIVERSITY OF WATERLOO
SEMINAR ACTIVITIES

MASTER'S THESIS PRESENTATION

                    -Thursday, December 14, 1989

Ms.   Yvonne   Dubreuil,  graduate  student,  Dept.  of
Computer  Science,  will  speak on ``The Integration of
Buffer Management and Recovery Management.''

TIME:                 2:30 p.m.

ROOM:                 DC 1304

ABSTRACT

The basics of IBM's ARIES Database Recovery System will
be  discussed.  This system uses fuzzy checkpoints thus
all  the  buffers containing dirty pages do not have to
be  written  out  during  checkpointing.   The  cost of
checkpointing  is significantly reduced especially with
the large buffer pools in use today.

Buffer  Managers  and  Recovery  Managers tend to be at
odds with each other.  The buffer manager wants to keep
pages  it  expects to be accessed in the near future in
the  buffer  pool  while  the recovery manager wants to
write  out  the  pages  that  will  poorly  affect  its
recovery performance.  I will discuss a buffer manager,
ODPF (Oldest Dirty Page First), that bases its criteria
for  page  replacement  on  data  that  is  used by the
recovery  system thus having the effect of lowering the
I/O cost of recovery even further.  Performance results
based on simulation will also be presented.

                    December 7, 1989