Semantic-based locking technique in object-oriented databases - Jun () Citation Context ...cols, DBMSs definitely finish transactions in the read phase and possibly rollback some of them in the validation phase
A lock is associated with each data item in the locking technique. Before executing a read or write operation on a data item, it is expected that each transaction must lock it and that each transaction must release all locks it holds before completing its tasks. ...
This paper describes a technique for use when multiple instances of a data base management system (DBMS), each with its own cache (buffer pool), can directly read and modify any data stored on a set of shared disks. Global locking and coherency control protocols are necessary in this ...
Optimistic locking is a technique that applications can use to release locks between SELECT and UPDATE or DELETE operations. If the selected rows change before that application updates or deletes them, the UPDATE or DELETE operation fails. Optimistic locking minimizes the time during which a given ...
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One technique I use is to bring along another small VAX and boot from that, then mount the target system's discs read-only over the SCSI bus (leaving the first system powered up but not booted if there's no other way to get at the discs).You'll find that several of the people ...
Another technique: rather than rereading the object, add the timestamp field along with the primary key to the WHERE clause used in the UPDATE statement. If no rows are updated, then the row no longer matches the timestamp (or the primary key was deleted). This is more efficient than tw...
6668295 Anticipatory lock mode conversions in a lock management system 2003-12-23 Chan 710/200 6581205 Intelligent compilation of materialized view maintenance for query processing systems 2003-06-17 Cochrane et al. 717/140 6353835 Technique for effectively maintaining materialized views in a data wareh...
In client-server database management systems (DBMSs), inter-transaction caching is an effective technique for improving the performance. However, inter-transaction caching requires a cache consistency maintenance (CCM) protocol to ensure that chached copies at clients are kept mutually consistant. Such...
The virtually universal technique of concurrency control is locking. In this regard, an application will acquire a lock on an object in the database in which it has an interest for reading, inserting, deleting, or changing. In order to ensure that the object will not change while the applica...