公开(公告)号：BR8901646A

公开(公告)日：1989-11-21

申请号：BR8901646

申请日：1989-04-07

Applicant: IBM

Inventor： HORN GARY RANDALL ,  SHIH CHENG-FONG

IPC: G06F9/46 ,  G06F9/445 ,  H01L29/201 ,  G06F15/40

公开(公告)号：DE68922431D1

公开(公告)日：1995-06-08

申请号：DE68922431

申请日：1989-02-24

Applicant: IBM

Inventor： MYRE WILLIAM WALTER ,  SHIH CHENG-FONG

IPC: G06F7/22 ,  G06F11/14 ,  G06F12/00

Abstract: Functions MINBUFLSN and LOWTRANLSN, implemented in a computerized routine, are defined and comprise first and second components of a checkpoint. MINBUFLSN is functionally related to a first update to a first of "dirty" data pages in the RAM buffer. LOWTRANLSN is functionally related to the earliest update of a sequence in a transaction table wherein each update corresponds to an uncommitted transaction. The two components are derived during write-ahead logging and stored in the log header periodically as a function of logging activity. Upon recovery, the checkpoint is retrieved and a functional comparison between the components thereof employed in the recovery algorithm. The conventional analysis pass of the recovery log is avoided and a reduced overhead during logging is provided as well as an efficient recovery.

公开(公告)号：DE68922431T2

公开(公告)日：1996-01-25

申请号：DE68922431

申请日：1989-02-24

Applicant: IBM

Inventor： MYRE WILLIAM WALTER ,  SHIH CHENG-FONG

IPC: G06F7/22 ,  G06F11/14 ,  G06F12/00

Abstract: Functions MINBUFLSN and LOWTRANLSN, implemented in a computerized routine, are defined and comprise first and second components of a checkpoint. MINBUFLSN is functionally related to a first update to a first of "dirty" data pages in the RAM buffer. LOWTRANLSN is functionally related to the earliest update of a sequence in a transaction table wherein each update corresponds to an uncommitted transaction. The two components are derived during write-ahead logging and stored in the log header periodically as a function of logging activity. Upon recovery, the checkpoint is retrieved and a functional comparison between the components thereof employed in the recovery algorithm. The conventional analysis pass of the recovery log is avoided and a reduced overhead during logging is provided as well as an efficient recovery.

公开(公告)号：BR8901649A

公开(公告)日：1989-11-21

申请号：BR8901649

申请日：1989-04-07

Applicant: IBM

Inventor： MYRE WILLIAM WALTER JR ,  SHIH CHENG-FONG

IPC: G06F7/22 ,  G06F11/14 ,  G06F12/00 ,  G06F15/40

Abstract: Functions MINBUFLSN and LOWTRANLSN, implemented in a computerized routine, are defined and comprise first and second components of a checkpoint. MINBUFLSN is functionally related to a first update to a first of "dirty" data pages in the RAM buffer. LOWTRANLSN is functionally related to the earliest update of a sequence in a transaction table wherein each update corresponds to an uncommitted transaction. The two components are derived during write-ahead logging and stored in the log header periodically as a function of logging activity. Upon recovery, the checkpoint is retrieved and a functional comparison between the components thereof employed in the recovery algorithm. The conventional analysis pass of the recovery log is avoided and a reduced overhead during logging is provided as well as an efficient recovery.