Boots – shoes – and leggings
Patent
1994-05-02
1996-08-13
Black, Thomas G.
Boots, shoes, and leggings
395650, 39518314, 364134, 364DIG1, 36424341, 36493543, 364DIG2, G06F 13364
Patent
active
055465790
ABSTRACT:
A method for ensuring data coherence while detecting whether the locally cached copy of a data page is invalid and responsively refreshing the locally cached page from a Shared Electronic Store (SES) in a multisystem shared disk environment. Locally cached data pages may become invalid in a multisystem shared disk environment because of transactions executed by other systems for the common database. Thus, whenever a transaction in a database management system (DBMS) instance desires to read or update a record in a locally cached data page, the DBMS must first verify validity for the locally cached copy and, for stale or invalid copies, must re-read and re-register the latest version in the SES. This invention provides a procedure for the necessary verification and refreshing steps that relies on page latching to serialize the combination of local multiuser and global multisystem activities. The procedure of this invention supports both record and page locking granularities.
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C. Mohan & I. Narang, "Recovery and Coherency-Control Protocols for Fast Intersystem Page Transfer and Fine-Granularity Locking in a Shared Disks Transaction Environment", Research Report RJ 8017, Mar. 15, 1991, International Business Machines Corp.
Josten Jeffrey W.
Mukai Tina
Narang Inderpal S.
Teng James Z.
Black Thomas G.
International Business Machines - Corporation
Pham C.
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