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Journal of the ACM, 1985
Many database systems maintain the consistency of the data by using a locking protocol to restrict access to data items. It has been previously shown that if no information is known about the method of accessing items in the database, then the two-phase protocol is optimal.
Abraham Silberschatz, G. N. Buckley
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Many database systems maintain the consistency of the data by using a locking protocol to restrict access to data items. It has been previously shown that if no information is known about the method of accessing items in the database, then the two-phase protocol is optimal.
Abraham Silberschatz, G. N. Buckley
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Lock Conversion in Non-Two-Phase Locking Protocols
IEEE Transactions on Software Engineering, 1985A locking protocol is a set of rules governing the manner in which the database entities may be accessed. Such a protocol usually employs several kinds of locks. Most of the previous work in this area has assumed that once a transaction acquires a particular kind of lock on a data item it is not allowed to convert this lock to another kind.
Abraham Silberschatz +3 more
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A secure two phase locking protocol
Proceedings of 1993 IEEE 12th Symposium on Reliable Distributed Systems, 2002A secure concurrency control algorithm must, in addition to maintaining consistency of the database, be free from covert channels arising due to data conflicts between transactions. The existing secure concurrency control approaches are unfair to transactions at higher access classes.
Sang H. Son, R. David
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Analysis and Simulation of Two Phase Locked Methods
2019 IEEE 2nd International Conference on Electronics and Communication Engineering (ICECE), 2019Phase-locked loop (PLL) is the widely used method to obtain the frequency and phase of grid voltage, and its performance is critical to the overall control system. For traditional synchronous reference frame phase-locked loop (SRF-PLL), voltage amplitude and phase are seriously distorted in three phase unbalance, the performance of the control system ...
He Hucheng +3 more
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Performance analysis of two-phase locking
IEEE Transactions on Software Engineering, 1991A straightforward analytic solution method is developed which takes into account the variability of transaction size (the number of lock requests). The authors first obtain analytic expressions for the probability of lock conflict, probability of deadlock, and the waiting time per lock conflict.
Alexander Thomasian, I.K. Ryu
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Locked particle standard deviation for two-phase systems
Powder Technology, 1989Abstract In many industrial applications, solids composed of a matrix and an inclusion phase are size reduced. For the first time, this monograph derives equations that describe the frequency distribution and standard deviation of the inclusions in the large locked particles.
T. P. MELOY +3 more
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Perfornance Study of Two Phase Locking in Single-Site Database Systems [PDF]
IEEE Transactions on Software Engineering, 1987 Many database systems guarantee the consistency of the database for concurrent transaction processing by a standard locking protocol called two phase locking. The performance of such systems is dependent on various factors, among which are the choices of locking granularity (the amount of data controlled by a single lock) and degree of multiprogramming
Belford, Geneva G, Pun, KH
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Compatibility and commutativity in non-two-phase locking protocols
Proceedings of the 1st ACM SIGACT-SIGMOD symposium on Principles of database systems - PODS '82, 1982Research on concurrency control mechanisms for database systems has had as a primary goal the discovery of techniques for allowing increased levels of concurrent execution of transactions. In this paper, we study this problem in the context of non-two-phase locking protocols which are defined for data bases in which a directed acyclic graph structure ...
C. Mohan +2 more
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Mitigation of Mutual Pulling in Two Phase-locked Loops
2021 19th IEEE International New Circuits and Systems Conference (NEWCAS), 2021In this study, we analyzed the output phase of two mutually coupled phase-locked loops (PLLs) based on the numerical calculation of nonlinear equations. According to the results, when the two PLLs were completely synchronized, the circuits became unstable owing to mutual coupling in certain timing conditions.
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A simple two phase lock-in detection system for a microwave interferometer [PDF]
Journal of Physics E: Scientific Instruments, 1970 A 33 GHz interferometer with a novel two-phase lock-in detection system for use in solid state plasma experiments is described. The technique for phase shifting the microwave signal transmitted through the specimen at a constant speed (5 Hz) relative to the reference (homodyne detection) and the method of synchronously rectifying the detected 5 Hz ...
O Leistiko, T Guldbrandsen
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