Filters








393,086 Hits in 3.5 sec

On periodicity in temporal databases

Alexander Tuzhilin, James Clifford
1995 Information Systems  
in the literature of temporal databases.  ...  However, there has been no comprehensive treatment of the subject of periodicity in the temporal database literature t h a t thoroughly addresses both the meaning of periodicity in t h e database context  ...  In order to understand what periodicity means in temporal databases, we consulted a dictionary [I] and identified two different intuitive meanings of periodicity that are related to temporal databases  ... 
doi:10.1016/0306-4379(95)00034-8 fatcat:rmnfyr34ybgcjeabssq2wxjwuu

Symbolic user-defined periodicity in temporal relational databases

P. Terenziani
2003 IEEE Transactions on Knowledge and Data Engineering  
Recently, some commercial databases started to support user-defined periodicity in the queries in order to provide "a human-friendly way of handling time" (see, e.g., TimeSeries in Oracle 8).  ...  method, user-friendly treatment of periodicity, integration and extension of artificial intelligence and temporal databases techniques.  ...  Jensen for many useful discussions, comments, and suggestions on early versions of this paper and to L. Egidi for her help in the revision of the latest version.  ... 
doi:10.1109/tkde.2003.1185847 fatcat:x5b3jakdkjctvl5rc6elsabpi4

SMCA: a general model for mining asynchronous periodic patterns in temporal databases

Kuo-Yu Huang, Chia-Hui Chang
2005 IEEE Transactions on Knowledge and Data Engineering  
Mining periodic patterns in time series databases is an important data mining problem with many applications.  ...  A 4-phase algorithm is devised to discover periodic patterns from a time series database presented in vertical format.  ...  First, this model only focused on mining periodic patterns in temporal sequences of events.  ... 
doi:10.1109/tkde.2005.98 fatcat:ihp2n7aac5djdmrmlfowa6qd7y

Checking and Verifying Temporal Data Validity Using Valid Time Temporal Dimension and Queries in Oracle 12C

Jaypalsinh A. Gohil, Prashant M. Dolia
2015 International Journal of Database Management Systems  
This study focuses on checking and verification of temporal data using valid time dimension of temporal database.  ...  Temporal validity support a unique feature of temporal database lets you associate one or more valid time dimensions with a table and have data be visible depending on its time-based validity, as determined  ...  Temporal data stored in a temporal database is different from the data stored in non-temporal database in that a time period attached to the data expresses when it was valid or stored in the database.  ... 
doi:10.5121/ijdms.2015.7402 fatcat:fgvlfjfepnazhb55gbfr4gihue

Polynomial time query processing in temporal deductive databases

Jan Chomicki
1990 Proceedings of the ninth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems - PODS '90  
We study conditions guaranteeing polynomial time computability of queries in temporal deductive databases.  ...  We show that if for a given set of temporal rules, the period of its least models is bounded from the above by a polynomial in the database size, then also the time to process yes-no queries (as well as  ...  Acknowledgments I am grateful to Tomasz Imielinski for suggesting that I work on this topic and for many discussions.  ... 
doi:10.1145/298514.298589 dblp:conf/pods/Chomicki90 fatcat:pc7uq2i3oje2bhotg2noxbiyy4

Querying TSQL2 databases with temporal logic [chapter]

Michael H. Böhlen, Jan Chomicki, Richard T. Snodgrass, David Toman
1996 Lecture Notes in Computer Science  
We demonstrate that temporal logic is equal in expressive power to a syntactically defined subset of TSQL2.  ...  The translation from temporal logic to TSQLZ developed here enables a user to write high-level queries which can be evaluated against a spaceefficient representation of the database.  ...  evaluated on any particular relationship given in Figure 1 result in the correct truth period.  ... 
doi:10.1007/bfb0014161 fatcat:wl7ifei6qbccnk4icgcm7krqly

An Algorithm to Simulate the Temporal Database Using Exponential Distribution

Shweta Sharma
2012 IOSR Journal of Computer Engineering  
Since the early eighties, an active temporal database research community has sought new insight into the management of time-referenced, or temporal, data and has developed concepts, tools and techniques  ...  Much of this activity has been motivated by the observations that most databases contain substantial amounts of temporal data and that conventional database technology offers precious little support for  ...  Conclusion Join operations are one of the most expensive operations in conventional databases and they pose even more serious problems in temporal databases because temporal databases are accumulating  ... 
doi:10.9790/0661-0134650 fatcat:tgyaj2a7jnh2vmlchq4guzwqfa

Retrieval Optimization Technique for Tuple Timestamp Historical Relation Temporal Data Model

Ghazi
2012 Journal of Computer Science  
Problem statement: In the field of database technology, Recoding time related data are referred to as temporal databases.  ...  We examine the current issues and problems in temporal database and propose data retrieval optimization technique for temporal database.  ...  Interval based model versus point based model in the temporal database involves period and there are a set of predicate and constructors for period temporal data type, where about 13 possible relationship  ... 
doi:10.3844/jcssp.2012.243.250 fatcat:5ndxopi7erdjbndq5v2jg24ycy

TIP

Jun Yang, Huacheng C. Ying, Jennifer Widom
2000 Proceedings of the 2000 ACM SIGMOD international conference on Management of data - SIGMOD '00  
To address the needs of applications requiring rich temporal data and queries, we have built TIP (Temporal Information Processor), a temporal extension to the Informix database system based on its DataBlade  ...  Commercial relational database systems today provide only limited temporal support.  ...  Demonstration Our TIP demonstration (fully functional in October 1999) is based on a synthetic medical database containing various types of temporal data as in the previous examples.  ... 
doi:10.1145/342009.336578 dblp:conf/sigmod/YangYW00 fatcat:pnxqydquzjarpemld3ksw55rnq

TIP

Jun Yang, Huacheng C. Ying, Jennifer Widom
2000 SIGMOD record  
To address the needs of applications requiring rich temporal data and queries, we have built TIP (Temporal Information Processor), a temporal extension to the Informix database system based on its DataBlade  ...  Commercial relational database systems today provide only limited temporal support.  ...  Demonstration Our TIP demonstration (fully functional in October 1999) is based on a synthetic medical database containing various types of temporal data as in the previous examples.  ... 
doi:10.1145/335191.336578 fatcat:oklckwoo3vcsfcmrwb43pfs4qu

Towards an implicit treatment of periodically-repeated medical data

Bela Stantic, Paolo Terenziani, Abdul Sattar, Alessio Bottrighi, Guido Governatori
2010 Studies in Health Technology and Informatics  
Temporal information plays a crucial role in medicine, so that in Medical Informatics there is an increasing awareness that suitable database approaches are needed to store and support it.  ...  In this paper, we propose an innovative approach to cope with periodic medical data in an implicit way.  ...  in the temporal database literature: Property 1 (Expressiveness).  ... 
pmid:20841860 fatcat:flaune3arvartbuqdo547cfy4e

Mining Time Variant Frequent Pattern using PPM and PWM: A Comparison

P. A.Shirsath, Vijay Kumar Verma
2013 International Journal of Computer Applications  
Data mining extracts knowledge or useful information and discovers correlations or meaningful patterns and rules from large databases [1, 2] .  ...  In this paper we proposed a comparative study over Progressive Partition Miner (PPM) and Progressive Weighted miner (PWM).  ...  Then time-variant database in light of weight periods of transactions and performs weight mining.  ... 
doi:10.5120/13558-1314 fatcat:sndq3d4uifdlnp36k4bpujh3a4

Mining high on-shelf utility itemsets with negative values from dynamic updated database [article]

Anjali N. Radkar, S.S. Pawar
2015 arXiv   pre-print
On-shelf utility mining considers on-shelf time period of item and gets the accurate utility values of itemsets in temporal database.  ...  In this paper, an effective algorithm is proposed to find high on-shelf utility itemsets with negative values from the dynamic updated temporal database.  ...  To indentify such itemsets, onshelf utility mining is proposed [11] in which an on-shelf period of products is calculated to get more accurate utility values of itemsets in temporal databases.  ... 
arXiv:1507.01759v1 fatcat:bbaifv5zvzd4rgtblqnargtk24

On the Use of Rough Set Theory for Mining Periodic Frequent Patterns

Manjeet Samoliya, Akhilesh Tiwari
2016 International Journal of Information Technology and Computer Science  
Index Terms-Association rule min ing, frequent pattern, periodic pattern mining, rough sets, temporal database.  A min imu m support threshold is applied to find all frequent item-sets in a database.  ...  This paper presents a new Apriori based approach for mining periodic frequent patterns from the temporal database.  ...  PROPOSED WORK In this paper has proposed a new Apriori based approach for mining periodic frequent patterns from the temporal database.  ... 
doi:10.5815/ijitcs.2016.07.08 fatcat:57neeqk7grhuddj7lvexz2vhme

Developing an Oracle-Based Spatio-Temporal Information Management System [chapter]

Lei Zhao, Peiquan Jin, Lanlan Zhang, Huaishuai Wang, Sheng Lin
2011 Lecture Notes in Computer Science  
In this paper, we present an extension of Oracle, named STOC (Spatio-Temporal Object Cartridge), to support spatio-temporal data management in a practical way.  ...  And finally, a case study of STOC is presented, which shows that STOC is effective to represent and query spatio-temporal data on the basis of Oracle.  ...  Therefore, it has been one of the most important goals in recent research on spatio-temporal databases to design and implement a practical spatio-temporal DBMS.  ... 
doi:10.1007/978-3-642-20244-5_16 fatcat:phfkc5xsijhanam3ccovmobumy
« Previous Showing results 1 — 15 out of 393,086 results