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Query Processor 

A genetic approach for random testing of database systems
A pay-as-you-go framework for query execution feedback
A Robust, Optimization-Based Approach for Approximate Answering of Aggregate Queries
Access path selection in a relational database management system
An Adaptive Hash Join Algorithm for Multiuser Environments
An Overview of Query Optimization in Relational Systems
Answering complex SQL queries using automatic summary tables
Automated Selection of Materialized Views and Indexes for SQL databases
Automating Statistics Management for Query Optimizers
Bringing order to query optimization
Conditional Selectivity for Statistics on Query Expressions
Configuration-parametric query optimization for physical design tuning
Cooperative Scans Dynamic Bandwidth Sharing in a DBMS
Cooperative Scans Dynamic Bandwidth Sharing in a DBMS PPT
Counting, enumerating, and sampling of execution plans in a cost-based query optimizer
Efficient use of the query optimizer for automated physical design
Efficiently approximating query optimizer plan diagrams
Eficient Creation of Statistics over Query Expressions
Estimating Compilation Time of a Query Optimizer
Estimating Progress of Execution for SQL Queries
Example-driven design of efficient record matching queries
Execution strategies for SQL subqueries
Exploiting Statistics on Query Expressions for Optimization
Hash Joins and Hash Teams in Microsoft SQL Server
Lazy maintenance of materialized views
LEO - DB2's Learning Optimizer
On Random Sampling over Joins
Optimizing queries using materialized views a practical, scalable solution
Orthogonal Optimization of Subqueries and Aggregation
Overcoming Limitations of Sampling for Aggregation Queries
PIVOT and UNPIVOT optimization and execution strategies in an RDBMS
Précis - The Essence of a Query Answer
Query evaluation techniques for large databases
Query Optimization
Query optimization in distributed networks of autonomous database systems
SIGMOD Testing Challenges for Extending SQL Server's Query Processor
SQL query optimization through nested relational algebra
SQL Server Optimizer
Statistical profile estimation in database systems
Statistics on views
The Complexity of Transformation-Based Join Enumeration
The Value of Merge-Join and Hash-Join in SQL Server
When CanWeTrust Progress Estimators for SQL Queries
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