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Query Processing

Query Processing

Query Processing. Parser. Select avg(R.a), R.b From R, S Where R.c = S.a.m() and R.c > 5 Group by R.b;. Parse tree. Semantic Checker. Query block graph. Compile-time. Type checker. Query block graph. Query Rewrite. Query block graph. Optimizer. Query block plan graph.

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517 views • 36 slides
Optimizing Nested Queries with Parameter Sort Orders

Optimizing Nested Queries with Parameter Sort Orders

Optimizing Nested Queries with Parameter Sort Orders. Ravindra N. Guravannavar Ramanujam H.S. S. Sudarshan Indian Institute of Technology Bombay. Nested Queries. Commonly encountered in practice Queries having performance issues are often complex nested queries

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496 views • 35 slides
Processing Nested Complex Sequence Pattern Queries over Event Streams

Processing Nested Complex Sequence Pattern Queries over Event Streams

Processing Nested Complex Sequence Pattern Queries over Event Streams. Mo Liu 1 , Medhabi Ray 1 , Elke A. Rundensteiner 1 , Dan Dougherty 1 , Chetan Gupta 2 , Song Wang 2 , Ismail Ari 3 , and Abhay Mehta 2 1 Worcester Polytechnic Institute, USA 2 HP Labs, USA 3 Ozyegin University, Turkey

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539 views • 34 slides
Processing Nested Complex Sequence Pattern Queries over Event Streams

Processing Nested Complex Sequence Pattern Queries over Event Streams

Processing Nested Complex Sequence Pattern Queries over Event Streams. Mo Liu 1 , Medhabi Ray 1 , Elke A. Rundensteiner 1 , Dan Dougherty 1 , Chetan Gupta 2 , Song Wang 2 , Ismail Ari 3 , and Abhay Mehta 2 1 Worcester Polytechnic Institute, USA 2 HP Labs, USA 3 Ozyegin University, Turkey

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465 views • 34 slides
Query Optimization and Intro to Transactions

Query Optimization and Intro to Transactions

Query Optimization and Intro to Transactions. R&G, Chapter 15 Chapter 16 Lecture 18. Administrivia. Homework 3 due next Tuesday, March 20 by end of class period Homework 4 available on class website Implement nested loops and hash join operators for (new!) minibase

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426 views • 33 slides
Relational Query Optimization

Relational Query Optimization

Relational Query Optimization. Chapters 14. Query Blocks: Units of Optimization. SELECT S.sname FROM Sailors S WHERE S.age IN ( SELECT MAX (S2.age) FROM Sailors S2 GROUP BY S2.rating ).

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257 views • 18 slides

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