Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Patent
1996-12-31
1998-10-13
Amsbury, Wayne
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
711114, 711117, 711161, 707 2, 707104, 707204, G06F 1700
Patent
active
058227806
ABSTRACT:
A hierarchical storage management system for database management systems that divides a database logically into separately managed regions, with each region being described by an entry in a vector kept in a regions file. The region entry contains a time stamp of the last time the region was accessed, the staging identifier of the region if it has been migrated, the base level backup staging identifier of the region if it has been baselined, and an indicator telling whether or not the region is resident online. Each managed region of the database is migrated to a separate staging file. When the database software issues a read or write input/output operation, the present invention sends the migration software a signal signifying this has occurred. The migration software of the present invention then updates the accessed time stamp, and checks to see if the region is resident. If it is not resident, it is staged in. The present invention creates and updates a migration candidate list ordered by date last accessed and region size. Both demand staging by the HSM, and user--initiated staging can then operate on the migration candidate list to migrate suitable files to tertiary storage.
REFERENCES:
patent: 5564037 (1996-10-01), Lam
patent: 5579507 (1996-11-01), Hosouchi et al.
Sunita Sarawagi Computer Science Division, 396 Soda Hall University of California, Berkeley, California 94720 Query Processing in Tertiary Memory Databases--Proceedings of the 21st VLDB Conference, Zurich, Switzerland, 1995.
Sunita Sarawagi Computer Science Division University of California, Berkeley Database Systems for Efficient Access to Tertiary Memory.
David Isaac The Mitre Corporation McLean, VA Hierarchical Storage Management for Relational Databases--Twelfth IEEE Symposium on Mass Storage Systems, pp. 130-144, Apr. 1993.
Bruce K. Hillyer, Avi Silberschatz Bell Labs Random I/O Scheduling in Online Tertiary Storage Systems.
Data Management Interfaces Group, Version 2.1 Mar. 1995, Interface Specification for the Data Management Application Programming Interface--Draft for Industry Review.
Amsbury Wayne
EMC Corporation
Jung David Fiuk
Stretch Maureen
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