Federated database systems for managing distributed, heterogeneous, and autonomous databases
ACM Computing Surveys (CSUR) - Special issue on heterogeneous databases
Research problems in data warehousing
CIKM '95 Proceedings of the fourth international conference on Information and knowledge management
Implementing data cubes efficiently
SIGMOD '96 Proceedings of the 1996 ACM SIGMOD international conference on Management of data
A framework for supporting data integration using the materialized and virtual approaches
SIGMOD '96 Proceedings of the 1996 ACM SIGMOD international conference on Management of data
Complexity of answering queries using materialized views
PODS '98 Proceedings of the seventeenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Obsolescent materialized views in query processing of enterprise information systems
Proceedings of the eighth international conference on Information and knowledge management
Synchronizing a database to improve freshness
SIGMOD '00 Proceedings of the 2000 ACM SIGMOD international conference on Management of data
AJAX: an extensible data cleaning tool
SIGMOD '00 Proceedings of the 2000 ACM SIGMOD international conference on Management of data
Building the Data Warehouse
Data Quality for the Information Age
Data Quality for the Information Age
Multiple View Consistency for Data Warehousing
ICDE '97 Proceedings of the Thirteenth International Conference on Data Engineering
Currency-Based Updates to Distributed Materialized Views
Proceedings of the Sixth International Conference on Data Engineering
Selection of Views to Materialize in a Data Warehouse
ICDT '97 Proceedings of the 6th International Conference on Database Theory
Materialized Views Selection in a Multidimensional Database
VLDB '97 Proceedings of the 23rd International Conference on Very Large Data Bases
Quality-driven Integration of Heterogenous Information Systems
VLDB '99 Proceedings of the 25th International Conference on Very Large Data Bases
Potter's Wheel: An Interactive Data Cleaning System
Proceedings of the 27th International Conference on Very Large Data Bases
A Formal Perspective on the View Selection Problem
Proceedings of the 27th International Conference on Very Large Data Bases
VLDB '97 Proceedings of the 23rd International Conference on Very Large Data Bases
Algorithms for Materialized View Design in Data Warehousing Environment
VLDB '97 Proceedings of the 23rd International Conference on Very Large Data Bases
Divergence Caching in Client Server Architectures
PDIS '94 Proceedings of the Third International Conference on Parallel and Distributed Information Systems
Estimating frequency of change
ACM Transactions on Internet Technology (TOIT)
Freshness-driven adaptive caching for dynamic content web sites
Data & Knowledge Engineering
Report on the Dagstuhl Seminar
ACM SIGMOD Record
Beyond accuracy: what data quality means to data consumers
Journal of Management Information Systems
Using latency-recency profiles for data delivery on the web
VLDB '02 Proceedings of the 28th international conference on Very Large Data Bases
Preference SQL: design, implementation, experiences
VLDB '02 Proceedings of the 28th international conference on Very Large Data Bases
Balancing performance and data freshness in web database servers
VLDB '03 Proceedings of the 29th international conference on Very large data bases - Volume 29
Defining a quality model for portal data
ICWE '06 Proceedings of the 6th international conference on Web engineering
Data quality awareness: a case study for cost optimal association rule mining
Knowledge and Information Systems - Special Issue on Mining Low-Quality Data
Ranking with tagging as quality indicators
Proceedings of the 2008 ACM symposium on Applied computing
A proposal for a set of attributes relevant for Web portal data quality
Software Quality Control
Incorporating Domain-Specific Information Quality Constraints into Database Queries
Journal of Data and Information Quality (JDIQ)
Automatic accuracy assessment via hashing in multiple-source environment
Expert Systems with Applications: An International Journal
Improving data analysis through diverse data source integration
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
Probabilistic quality assessment based on article's revision history
DEXA'11 Proceedings of the 22nd international conference on Database and expert systems applications - Volume Part II
Influence of attribute freshness on decision making in usage control
STM'10 Proceedings of the 6th international conference on Security and trust management
Defining a data quality model for web portals
WISE'06 Proceedings of the 7th international conference on Web Information Systems
Managing quality properties in a ROLAP environment
CAiSE'06 Proceedings of the 18th international conference on Advanced Information Systems Engineering
Service retrieval based on behavioral specifications and quality requirements
BPM'05 Proceedings of the 3rd international conference on Business Process Management
Roles of agents in data-intensive web sites
KES'05 Proceedings of the 9th international conference on Knowledge-Based Intelligent Information and Engineering Systems - Volume Part III
Document interrogation: architecture, information extraction and approximate answers
EDBT'06 Proceedings of the 2006 international conference on Current Trends in Database Technology
A first approach to a data quality model for web portals
ICCSA'06 Proceedings of the 2006 international conference on Computational Science and Its Applications - Volume Part III
Information Processing and Management: an International Journal
Assessing web article quality by harnessing collective intelligence
DASFAA'12 Proceedings of the 17th international conference on Database Systems for Advanced Applications - Volume Part I
Probabilistically ranking web article quality based on evolution patterns
Transactions on Large-Scale Data- and Knowledge-Centered Systems VI
Scheduling with freshness and performance guarantees for web applications in the cloud
ADC '11 Proceedings of the Twenty-Second Australasian Database Conference - Volume 115
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Data freshness has been identified as one of the most important data quality attributes in information systems. This importance increases particularly in the context of distributed systems, composed of a large set of autonomous data sources, where integrating data having different freshness may lead to semantic problems. There are various definitions of data freshness in the literature, depending on the applications where they are used, as well as different metrics to measure them. This paper presents an analysis of these definitions and metrics and proposes a taxonomy based upon the nature of the data, the type of application and the synchronization policies underlying the multi-source information system. We analyze, in terms of the taxonomy, the way freshness is defined and used in several types of systems and we present some open research problems in the field of data freshness evaluation.