Efficiently updating materialized views
SIGMOD '86 Proceedings of the 1986 ACM SIGMOD international conference on Management of data
Optimization of large join queries: combining heuristics and combinatorial techniques
SIGMOD '89 Proceedings of the 1989 ACM SIGMOD international conference on Management of data
Extensible/rule based query rewrite optimization in Starburst
SIGMOD '92 Proceedings of the 1992 ACM SIGMOD international conference on Management of data
Maintaining views incrementally
SIGMOD '93 Proceedings of the 1993 ACM SIGMOD international conference on Management of data
SIGMOD '94 Proceedings of the 1994 ACM SIGMOD international conference on Management of data
View maintenance issues for the chronicle data model (extended abstract)
PODS '95 Proceedings of the fourteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Outerjoin simplification and reordering for query optimization
ACM Transactions on Database Systems (TODS)
ACM Computing Surveys (CSUR)
NiagaraCQ: a scalable continuous query system for Internet databases
SIGMOD '00 Proceedings of the 2000 ACM SIGMOD international conference on Management of data
Continuously adaptive continuous queries over streams
Proceedings of the 2002 ACM SIGMOD international conference on Management of data
Continual Queries for Internet Scale Event-Driven Information Delivery
IEEE Transactions on Knowledge and Data Engineering
How to Extend a Conventional Optimizer to Handle One- and Two-Sided Outerjoin
Proceedings of the Eighth International Conference on Data Engineering
VLDB '98 Proceedings of the 24rd International Conference on Very Large Data Bases
Including Group-By in Query Optimization
VLDB '94 Proceedings of the 20th International Conference on Very Large Data Bases
Aggregate-Query Processing in Data Warehousing Environments
VLDB '95 Proceedings of the 21th International Conference on Very Large Data Bases
Tribeca: A Stream Database Manager for Network Traffic Analysis
VLDB '96 Proceedings of the 22th International Conference on Very Large Data Bases
Gigascope: a stream database for network applications
Proceedings of the 2003 ACM SIGMOD international conference on Management of data
STREAM: the stanford stream data manager (demonstration description)
Proceedings of the 2003 ACM SIGMOD international conference on Management of data
TelegraphCQ: continuous dataflow processing
Proceedings of the 2003 ACM SIGMOD international conference on Management of data
Expressing and optimizing sequence queries in database systems
ACM Transactions on Database Systems (TODS)
Data densification in a relational database system
SIGMOD '04 Proceedings of the 2004 ACM SIGMOD international conference on Management of data
Optimizing refresh of a set of materialized views
VLDB '05 Proceedings of the 31st international conference on Very large data bases
Monitoring streams: a new class of data management applications
VLDB '02 Proceedings of the 28th international conference on Very Large Data Bases
Incremental maintenance for non-distributive aggregate functions
VLDB '02 Proceedings of the 28th international conference on Very Large Data Bases
Data-Continuous SQL Process Model
OTM '08 Proceedings of the OTM 2008 Confederated International Conferences, CoopIS, DOA, GADA, IS, and ODBASE 2008. Part I on On the Move to Meaningful Internet Systems:
Detecting Moving Objects in Noisy Radar Data Using a Relational Database
ADBIS '09 Proceedings of the 13th East European Conference on Advances in Databases and Information Systems
A magic approach to optimizing incremental relational expressions
IDEAS '09 Proceedings of the 2009 International Database Engineering & Applications Symposium
On-the-fly progress detection in iterative stream queries
Proceedings of the VLDB Endowment
An algebric window model for data stream management
Proceedings of the Ninth ACM International Workshop on Data Engineering for Wireless and Mobile Access
Revisiting formal ordering in data stream querying
Proceedings of the 27th Annual ACM Symposium on Applied Computing
Efficient tracking of moving objects using a relational database
Information Systems
Towards window stream queries over continuous phenomena
Proceedings of the 4th ACM SIGSPATIAL International Workshop on GeoStreaming
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This paper describes Continuous Queries (CQ) in Oracle RDBMS, a feature that incorporates stream and complex event processing into an RDBMS, the first such attempt in commercial databases. The feature is based on the concept of query difference and allows us to monitor real time changes to the query as the result of changes to its underlying tables. The result of a continuous query can be deposited into historical tables or queues for further asynchronous de-queuing, or can invoke a synchronous trigger for procedural processing. The main contribution of our CQ engine is that it allows us to react to complex scenarios of changes to data such as mixed INSERT, DELETE and UPDATE changes, unlike the existing stream processing systems that deal with INSERTS only. We support a wide range of query shapes including inner, semi and anti-joins, aggregates and window functions. More details are given to the efficient computation of query difference for general cases and their optimizations based on semantic constraints. They are shown to improve the response time for practical cases by more than an order of magnitude. We also show how delaying CQ re-computation can improve its performance by batch processing the changes to the base tables.