公开(公告)号：BR8901635A

公开(公告)日：1989-11-21

申请号：BR8901635

申请日：1989-04-07

Applicant: IBM

Inventor： ELLIOT LINDA CAROLYN ,  HORN GARY RANDALL

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

Abstract: System and method for reducing data loss in a database system during I/O errors and power failure during non-atomic writes to media in a transaction management system using write-ahead logging protocol. A recovery log is written during forward processing. On system restart processing, the log is traversed and a REDO executed. Recovery is effected from detected incomplete log writes or log write failures and uncommitted transactions are undone. A technique is provided in which files having I/O errors are identified, whereby subsequent restart operations are prevented from accessing these files. In one embodiment index files with such error are renamed, serving to indicate that corresponding original files contain errors, and the error index files are automatically rebuilt whereby I/O error on the files causes no data loss. The index file rebuild does not invalidate access plans related to the failed index.

公开(公告)号：DE3279152D1

公开(公告)日：1988-12-01

申请号：DE3279152

申请日：1982-08-25

Applicant: IBM

Inventor： HORN GARY RANDALL ,  SHIPP KENNETH OSBORN

IPC: G06F3/12 ,  B41J5/30 ,  B41J21/04 ,  B41J21/14 ,  G06F17/24 ,  G06F40/189 ,  G06K15/00

Abstract: In a column layout operation in an interactive word processing system, the unoccupied character escapement along a column example line is automatically evenly distributed by the insertion of an appropriate number of space characters responsive to the stroking of a predetermined function key.