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- Online_aggregation abstract "Online aggregation is a technique for improving the interactive behavior of database systems processing expensive analytical queries. Almost all database operations are performed in batch mode, i.e. the user issues a query and waits till the database has finished processing the entire query. On the contrary, using online aggregation, the user gets estimates of an aggregate query in an online fashion as soon as the query is issued. For example, if the final answer is 1000, after k seconds, the user gets the estimates in form of a confidence interval like [990, 1020] with 95% probability. This confidence keeps on shrinking as the system gets more and more samples. Online aggregation was proposed in 1997 by Hellerstein, Haas and Wang for group-by aggregation queries over a single table. Later, the authors showed how to evaluate joins in an online fashion. In 2007, Jermaine et al. designed and implemented a prototype database system called Database-Online (or DBO) that computes group-by aggregate query over multiple tables in an online and more importantly in a scalable fashion. All the approaches for online aggregation use random sampling, which is non-trivial in a distributed environment due to inspection paradox of renewal reward theory. In 2011, Pansare et al. proposed a Bayesian model to deal with the inspection paradox and implemented online aggregation for a MapReduce-like environment.".
- Online_aggregation wikiPageID "33262148".
- Online_aggregation wikiPageLength "2740".
- Online_aggregation wikiPageOutDegree "8".
- Online_aggregation wikiPageRevisionID "594792937".
- Online_aggregation wikiPageWikiLink Aggregate_function.
- Online_aggregation wikiPageWikiLink Bayesian_probability.
- Online_aggregation wikiPageWikiLink Category:Database_theory.
- Online_aggregation wikiPageWikiLink Database.
- Online_aggregation wikiPageWikiLink Database_systems.
- Online_aggregation wikiPageWikiLink MapReduce.
- Online_aggregation wikiPageWikiLink Renewal_theory.
- Online_aggregation wikiPageWikiLink Sampling_(statistics).
- Online_aggregation wikiPageWikiLinkText "Online aggregation".
- Online_aggregation wikiPageWikiLinkText "online aggregation".
- Online_aggregation hasPhotoCollection Online_aggregation.
- Online_aggregation wikiPageUsesTemplate Template:Database-stub.
- Online_aggregation wikiPageUsesTemplate Template:Reflist.
- Online_aggregation subject Category:Database_theory.
- Online_aggregation hypernym Technique.
- Online_aggregation type Area.
- Online_aggregation type Software.
- Online_aggregation type Area.
- Online_aggregation comment "Online aggregation is a technique for improving the interactive behavior of database systems processing expensive analytical queries. Almost all database operations are performed in batch mode, i.e. the user issues a query and waits till the database has finished processing the entire query. On the contrary, using online aggregation, the user gets estimates of an aggregate query in an online fashion as soon as the query is issued.".
- Online_aggregation label "Online aggregation".
- Online_aggregation sameAs m.0h7nyj7.
- Online_aggregation sameAs Q7094056.
- Online_aggregation sameAs Q7094056.
- Online_aggregation wasDerivedFrom Online_aggregation?oldid=594792937.
- Online_aggregation isPrimaryTopicOf Online_aggregation.