On-line warehouse view maintenance
SIGMOD '97 Proceedings of the 1997 ACM SIGMOD international conference on Management of data
Integrating the rewriting and ranking phases of view synchronization
Proceedings of the 1st ACM international workshop on Data warehousing and OLAP
Management of heterogeneous and autonomous database systems
Management of heterogeneous and autonomous database systems
Materialized views: techniques, implementations, and applications
Materialized views: techniques, implementations, and applications
Proceedings of the 2nd ACM international workshop on Data warehousing and OLAP
Maintaining data warehouses over changing information sources
Communications of the ACM
Efficiently synchronizing multidimensional schema data
Proceedings of the 4th ACM international workshop on Data warehousing and OLAP
Case Method: Entity Relationship Modelling
Case Method: Entity Relationship Modelling
Interconnecting Heterogeneous Information Systems
Interconnecting Heterogeneous Information Systems
Fundamentals of Data Warehouses
Fundamentals of Data Warehouses
A multidimensional and multiversion structure for OLAP applications
Proceedings of the 5th ACM international workshop on Data Warehousing and OLAP
InterViso: dealing with the complexity of federated database access
The VLDB Journal — The International Journal on Very Large Data Bases
VLDB '00 Proceedings of the 26th International Conference on Very Large Data Bases
Hypothetical Queries in an OLAP Environment
VLDB '00 Proceedings of the 26th International Conference on Very Large Data Bases
Management Of Schema Evolution In Databases
VLDB '91 Proceedings of the 17th International Conference on Very Large Data Bases
Querying Heterogeneous Information Sources Using Source Descriptions
VLDB '96 Proceedings of the 22th International Conference on Very Large Data Bases
A Foundation for Multi-dimensional Databases
VLDB '97 Proceedings of the 23rd International Conference on Very Large Data Bases
On Schema Evolution in Multidimensional Databases
DaWaK '99 Proceedings of the First International Conference on Data Warehousing and Knowledge Discovery
Temporal Structures in Data Warehousing
DaWaK '99 Proceedings of the First International Conference on Data Warehousing and Knowledge Discovery
Changes of Dimension Data in Temporal Data Warehouses
DaWaK '01 Proceedings of the Third International Conference on Data Warehousing and Knowledge Discovery
Schema Evolution in Heterogeneous Database Architectures, A Schema Transformation Approach
CAiSE '02 Proceedings of the 14th International Conference on Advanced Information Systems Engineering
The COMET Metamodel for Temporal Data Warehouses
CAiSE '02 Proceedings of the 14th International Conference on Advanced Information Systems Engineering
Supporting Dimension Updates in an OLAP Server
CAiSE '02 Proceedings of the 14th International Conference on Advanced Information Systems Engineering
View Mechanism for Schema Evolution
BNCOD 14 Proceedings of the 14th British National Conference on Databases: Advances in Databases
Consistency in Data Warehouse Dimensions
IDEAS '02 Proceedings of the 2002 International Symposium on Database Engineering & Applications
A Transactional Model for Data Warehouse Maintenance
ER '02 Proceedings of the 21st International Conference on Conceptual Modeling
Automatic Migration and Wrapping of Database Applications - A Schema Transformation Approach
ER '99 Proceedings of the 18th International Conference on Conceptual Modeling
A Unified Framework for Supporting Dynamic Schema Evolution in Object Databases
ER '99 Proceedings of the 18th International Conference on Conceptual Modeling
Maintaining Data Cubes under Dimension Updates
ICDE '99 Proceedings of the 15th International Conference on Data Engineering
Concurrent Maintenance of Views Using Multiple Versions
IDEAS '99 Proceedings of the 1999 International Symposium on Database Engineering & Applications
Creation and management of versions in multiversion data warehouse
Proceedings of the 2004 ACM symposium on Applied computing
On querying versions of multiversion data warehouse
Proceedings of the 7th ACM international workshop on Data warehousing and OLAP
Exploiting versions for on-line data warehouse maintenance in MOLAP servers
VLDB '02 Proceedings of the 28th international conference on Very Large Data Bases
Metadata management in a multiversion data warehouse
Journal on data semantics VIII
E-Metadata versioning system for data warehouse schema
International Journal of Metadata, Semantics and Ontologies
E-Metadata versioning system for data warehouse schema
International Journal of Metadata, Semantics and Ontologies
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A data warehouse (DW) is supplied with data that come from external data sources (EDSs) that are production systems. EDSs, which are usually autonomous, often change not only their contents but also their structures. The evolution of external data sources has to be reflected in a DW that uses the sources. Traditional DW systems offer a limited support for handling dynamics in their structures and contents. A promising approach to this problem is based on a multiversion data warehouse (MVDW). In such a DW, every DW version includes a schema version and data consistent with its schema version. A DW version may represent a real state at certain period of time, after the evolution of EDSs or changed user requirements or the evolution of the real world. A DW version may also represent a given business scenario that is created for simulation purposes. In order to appropriately synchronize a MVDW content and structure with EDSs as well as to analyze multiversion data, a MVDW has to manage metadata. Metadata describing a MVDW are much more complex than in traditional DWs. In our approach and prototype MVDW system, a metaschema provides data structures that support: (1) monitoring EDSs with respect to content and structural changes, (2) automatic generation of processes monitoring EDSs, (3) applying the discovered EDS changes to a selected, DW version, (4) describing the structure of every DW version, (5) querying multiple DW versions of interest at the same time, (6) presenting and comparing multiversion query results.