公开(公告)号：GB2273180A

公开(公告)日：1994-06-08

申请号：GB9225210

申请日：1992-12-02

Applicant: IBM

Inventor： COHN ODED ,  NAGIN KENNETH ,  NOVICK YORAM ,  WINOKUR ALEX

IPC: G06F12/00 ,  G06F11/14 ,  G06F12/16 ,  G11C29/00 ,  G06F15/40

Abstract: A backup method for a computer database system in which updates to the mirrored data of a remote database are delayed for a delay time greater than or equal to the communication delay between the local and remote databases and updates to a remote log for the database are executed after corresponding updates to a local log without such a delay. In this way a consistent copy of the database may be recovered from the mirrored copy of the database and the remote log after destruction of the database system.