Pissinou, N., Snodgrass, R., Elmasri, R., Mumick, I., Ozsu, M., Pernici, B., Theodoulidis, B., "Towards an Infrastructure for Temporal Databases", ACM Sigmod Record, Vol. 23, no. 1, pp 36-61, 1994.  Home/Search   Document Details and Download   Summary   Related Articles   Check

.... a formal semantics to active database behavior presents a challenge even when only simple events are involved [20, 19] For composite event expressions, this problem becomes even more complex, inasmuch as the issues of temporal databases and active rule languages are now combined and intertwined [21]. In previous systems, the operational semantics of composite event detection has been defined using widely different frameworks, such as Finite State Automata [12] Petri Nets [11] or Event Graphs [4] Eventhough these systems have captured a great deal of the functionality required by active ....

N. Pissinou, R. Snodgrass, R. Elmasri, I. Mumick, M. Ozsu, B. Pernici, A. Segev, B. Theodoulidis, and U. Dayal. Towards an infrastructure for temporal databases. ACMSIGMOD Record, 23(1), March 1994.

....in its environment, so as to respond to those events that affect the plan execution. The ability to monitor the events in the system is also referred as event tracking. The concept of events (primitive and composite) has also been examined in other research areas like Active and Temporal Databases [11, 17]. In a CIM system, faults are events which have been sensed in the system. A fault may be a physical defect, environmental stress, operator s mistake, etc. Without loss of generality, in CIM systems, some faults are expected; that is, it is anticipated that something may go wrong. Moreover, ....

Pissinou, N., Snodgrass, R., Elmasri, R., Mumick, I., Ozsu, M., Pernici, B., Theodoulidis, B., "Towards an Infrastructure for Temporal Databases", ACM Sigmod Record, Vol. 23, no. 1, pp 36-61, 1994.

....includes services dedicated to Event Management that support definition and management of events or alarms through the use of objects for event condition, event enrollment and event action. Moreover, the concept of primitive and composite events has been examined in Active and Temporal Databases [15, 36]. From a task planning point of view, some events may not affect the overall plan execution, whereas some others may instigate faults, errors, and failures in the system; namely, some events may alter actions effects and modify the system s stage. Thus, the overall behaviour of the sys tem ....

Pissinou, N., Snodgrass, R., Elmasri, R., Mumick, I., Ozsu, M., Pernici, B., Theodoulidis, B., "Towards an Infrastructure for Temporal Databases", ACM Sigmod Record, Vol. 23, no. 1, pp 36-61, 1994.

....weeks ago, on a month to month basis. The construct now is used for the current time (the most recent transaction time) OVERLAPS is a temporal operator which becomes true when two intervals overlap. 3. 3 Active temporal Databases An active framework for temporal databases (TDB) is defined in [ea94] Composite event algebras allow one to relate basic events occurring at different time points, in as much the same way as temporal queries in a TDB enable one to specify pattern of values in successive versions (history) of relations. Thus composite event specifications are a form of temporal ....

....relate basic events occurring at different time points, in as much the same way as temporal queries in a TDB enable one to specify pattern of values in successive versions (history) of relations. Thus composite event specifications are a form of temporal queries. An active temporal database in [ea94] is defined as a database that supports active temporal rules. An active rule is said to be temporal if 1. the event is a composite event that refers to basic events occurring at time points other than the time when the rule is fired, or CHAPTER 3. ACTIVE AND TEMPORAL DATABASES 44 2. the event ....

N. Pissinou et. al. Towards an infrastructure for temporal databases, report of an invitational ARPA/NSF workshop. Technical Report TR 94-01, Department of Computer Science, University of Arizona, March 1994.

....giving a formal semantics to active database behavior presents a challenge even when only simple events are involved. For composite event expressions, this problem becomes even more complex, inasmuch as the issues of temporal databases and active rule languages are now combined and intertwined [19]. Furthermore, the operational semantics of composite event detection in previous systems have been defined using widely different frameworks, such as Finite State Automata [11] Petri Nets [10] or Event Graphs [3] Eventhough these systems have captured a great deal of the functionality ....

N. Pissinou, R. Snodgrass, R. Elmasri, I. Mumick, M. Ozsu, B. Pernici, A. Segev, B. Theodoulidis, and U. Dayal. Towards an infrastructure for temporal databases. ACM-SIGMOD Record, 23(1), March 1994.

....events in active databases. Temporal models (e.g. 12] 16] 18] 14] discuss the propagation of the temporal effect on the results of reactive activation of programs. Rules that affect past or future valid times where briefly discussed in the temporal infrastructure recommendations report [13] A more thorough discussion of possible inter relationships of rules and temporal elements was presented in [6] Temporal query languages (e.g. 15] enable the manipulation of time attributes as part of the language, and the use of defaults in defining time bounded values. In this paper we ....

....with a specific object. A variable in a temporal database consists of a set of time stamped values. 1 For example, 1 Additional attributes of information about source, validity, accessibility, etc. can be added to a stateelement. These extensions are discussed in [9] 4 Points= val1) 2, Dec 1 1994, Dec 1 1994; Dec 1 1996) val2) 4, Nov 12 1995; Nov 12 1995; Dec 1 1996) val3) 2, Nov 12 1995; z t x [Dec 1 1996; Nov 12 1998) z t v Figure 2: Database values of John Doe s Points Figure 2 illustrates the changes to the variable Points of the Driver John Doe. An event ....

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N. Pissinou et al. Towards an infrastructure for temporal databases. Technical Report TR 94-01, The University of Arizona, Mar 1994. 14

.... 10:00pm, 1) status=changeable Object Status= se3) Active, t x=Dec 12 1993; 10:02pm, t d =Dec 12 1993; 10:00pm, t v= Dec 12 1993; 10:00pm, 1) status=changeable (se4) Suspended, t x=Dec 19 1993; 8:02am, t d =Dec 19 1993; 8:00am, t v= Dec 19 1993; 8:00am, 1) status=changeable (se5) Active, t x=Aug 24 1994; 12:03am, t d =Aug 24 1994; 12:00am, t v= Aug 24 1994; 12:00am, 1) status=changeable (se6) Disabled, t x=Aug 25 1994; 8:05am, t d =Aug 25 1994; 8:00am, t v= Aug 25 1994; 8:00am, 1) status=changeable (se7) nil, t x=Aug 25 1994; 8:05am, t d =Aug 25 1994; 8:00am, t v= Aug 25 1994; 8:00am, 1) ....

.... Object Status= se3) Active, t x=Dec 12 1993; 10:02pm, t d =Dec 12 1993; 10:00pm, t v= Dec 12 1993; 10:00pm, 1) status=changeable (se4) Suspended, t x=Dec 19 1993; 8:02am, t d =Dec 19 1993; 8:00am, t v= Dec 19 1993; 8:00am, 1) status=changeable (se5) Active, t x=Aug 24 1994; 12:03am, t d =Aug 24 1994; 12:00am, t v= Aug 24 1994; 12:00am, 1) status=changeable (se6) Disabled, t x=Aug 25 1994; 8:05am, t d =Aug 25 1994; 8:00am, t v= Aug 25 1994; 8:00am, 1) status=changeable (se7) nil, t x=Aug 25 1994; 8:05am, t d =Aug 25 1994; 8:00am, t v= Aug 25 1994; 8:00am, 1) status=frozen Patient Name= ....

[Article contains additional citation context not shown here]

N. Pissinou et al. Towards an infrastructure for temporal databases. Technical Report TR 94-01, The University of Arizona, Mar 1994.

....events in active databases. Temporal models (e.g. 14] 18] 20] 17] discuss the propagation of the temporal effect on the results of reactive activation of programs. Rules that affect past or future valid times where briefly discussed in the temporal infrastructure recommendations report [16] A more thorough discussion of possible inter relationships of rules and temporal elements was presented in [7] In this paper we introduce a temporal active language that encapsulates a wide range of temporal constraints and active capabilities. The main contribution of this paper, as discussed ....

....by the system clock, the third is signaled by the user, and the fourth is a result of a change in a variable. A thorough 1 Additional attributes of information about source, validity, accessibility, etc. can be added to a stateelement. These extensions are discussed in [10] Points= val1) 2, Dec 1 1994, Dec 1 1994; Dec 1 1996) val2) 4, Nov 12 1995; Nov 12 1995; Dec 1 1996) val3) 2, Nov 12 1995; z t x [Dec 1 1996; Nov 12 1998) z t v Figure 2: Database values of John Doe s Points discussion of events classification and detection techniques can be found in [1] 3] An ....

[Article contains additional citation context not shown here]

N. Pissinou et al. Towards an infrastructure for temporal databases. Technical Report TR 94-01, The University of Arizona, Mar 1994.

.... a formal semantics to active database behavior presents a challenge even when only simple events are involved [28, 27] For composite event languages, this problem becomes even more complex, inasmuch as the issues of temporal databases and active rule languages are now combined and intertwined [29]. In previous systems, the operational semantics of composite event detection has been defined using widely different frameworks, such as Finite State Automata [15] Petri Nets [14] or Event Graphs [4] Even though these systems have captured many aspects of the functionality required by active ....

N. Pissinou, R. Snodgrass, R. Elmasri, I. Mumick, M. Ozsu, B. Pernici, A. Segev, B. Theodoulidis, and U. Dayal. Towards an Infrastructure for Temporal Databases. ACMSIGMOD Record, 23(1):35--51, March 1994.

....a nondecomposable unit of time, is defined in [ea93] An event occurs at any time during the chronon interval. In the network management domain we need the support for multiple choronons associated with each event entity or relation. The need for the support of multiple chronons is mentioned in [ea94]. An interval is the time between two events. It may be represented by a set of contiguous chronons [ea93] 2.3 Network Management Databases Network management consists of monitoring and controlling the behavior of a network, which require the presence of sophisticated mechanism for the ....

N. Pissinou et. al. Towards an infrastructure for temporal databases, report of an invitational ARPA/NSF workshop. Technical Report TR 94-01, Department of Computer Science, University of Arizona, March 1994.

....A full description of the temporal active database model can be found in [4] Section 2.1 describes the temporal data model, section 2.2 describes the dependency language, section 2.3. describes the temporal dependency graph. 2. 1 The Temporal Data Model The temporal database infrastructure [13] advocates a bi temporal database that contain the two temporal characteristics of each data element. Transaction Time (t x ) The commit time of the transaction which updated the data item. Valid Time (t v ) The time points in which the decision maker believes that this value reflects the ....

N. Pissinou, et al - Towards an Infrastructure for Temporal Databases, Sigmod Record, 23(1), pp 35-51, Mar 1994.

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Pissinou, N., Snodgrass, R., Elmasri, R., Mumick, I., Ozsu, M., Pernici, B., Theodoulidis, B., "Towards an Infrastructure for Temporal Databases", ACM Sigmod Record, Vol. 23, no. 1, pp 36-61, 1994.

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