By Umeshwar Dayal (auth.), Mikael Berndtsson MSc, Jörgen Hansson MSc (eds.)
The components of energetic and real-time databases have obvious an immense progress of curiosity some time past few years, rather in regards to their aid of time-critical and embedded functions. ARTDB-95 supplied, for this reason, a major discussion board for researchers from either groups to debate study effects, and in addition to chart new instructions for the longer term. in addition to the eleven submitted papers awarded on the workshop, this quantity additionally includes four invited papers at the following themes: the influence of energetic databases on advertisement perform; the optimization of lively database transactions; the necessity for greater language, compiler and power help for real-time databases; and the starting place of time constraints linked to facts, occasions and activities. jointly the papers provide a complete evaluate of present study, and should offer worthwhile studying for educational and business researchers and scholars at either undergraduate and postgraduate level.
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Additional resources for Active and Real-Time Database Systems (ARTDB-95): Proceedings of the First International Workshop on Active and Real-Time Database Systems, Skövde, Sweden, 9–11 June 1995
A task T moves from the ready_to_terminate state to the terminated state if C2 not holds or if T has not activated a task. 27 wait Figure 1: the state transition diagram of a RMT We model the task ordering by means of a scheduling of a job which consists of a graph equipped with a precedence relationship between its nodes. This graph is built from a task processing policy (given by the synchronization points and the selectO function), and the activation links between the tasks. Nodes of the graph are tasks, noted N i , and synchronization points, noted p;.
A task T moves from the ready_to_terminate state to the terminated state if: C1: all the tasks directly activated by T are terminated C2: There exists a preemptive external synchronization point p such that: (i) p succeeds T, or (ii) p succeeds a task T' and T occurs before T' in the same sequence of execution scheduled by the invocation of selectO. 9. A task T moves from the ready_to_terminate state to the terminated state if C2 not holds or if T has not activated a task. 27 wait Figure 1: the state transition diagram of a RMT We model the task ordering by means of a scheduling of a job which consists of a graph equipped with a precedence relationship between its nodes.
Traditionally, database performance measures have aimed at statistical improvements, or at on-average improvement due to improved memory locality. Thus in particular, transaction throughput, minimization of "locked" intervals or recovery, caching of requests, and batching of readers, have all significantly contributed to averaged speed-ups in database operations. Query optimization has been concerned principally with transforming the algebraic form of a query, and optimizing memory access patterns by changing the order of key traversal, using techniques similar in spirit to those for compiler loop-level parallelism, but typically vastly different in implementation.