The Query Optimizer in Tandem's new ServerWare SQL Product
نویسنده
چکیده
A brief overview of Nonstop SQL product will be followed by a description of what is different in ServerWare SQL. The current Nonstop SQL optimizer uses a traditional bottom-up dynamic programming optimizer. This is the same type of optimization algorithm used in System R and many commercial products. The optimizer in the new product is a top-down branch and bound ruledriven cost based optimizer similar to work done on the Volcano optimizer.
منابع مشابه
The Cascades Framework for Query Optimization
This paper describes a new extensible query optimization framework that resolves many of the shortcomings of the EXODUS and Volcano optimizer generators. In addition to extensibility, dynamic programming, and memorization based on and extended from the EXODUS and Volcano prototypes, this new optimizer provides (i) manipulation of operator arguments using rules or functions, (ii) operators that ...
متن کاملXplus: A SQL-Tuning-Aware Query Optimizer
The need to improve a suboptimal execution plan picked by the query optimizer for a repeatedly run SQL query arises routinely. Complex expressions, skewed or correlated data, and changing conditions can cause the optimizer to make mistakes. For example, the optimizer may pick a poor join order, overlook an important index, use a nested-loop join when a hash join would have done better, or cause...
متن کاملTesting SQL Server's Query Optimizer: Challenges, Techniques and Experiences
Query optimization is an inherently complex problem, and validating the correctness and effectiveness of a query optimizer can be a task of comparable complexity. The overall process of measuring query optimization quality becomes increasingly challenging as modern query optimizers provide more advanced optimization strategies and adaptive techniques. In this paper we present a practitioner’s a...
متن کاملThe use of Hints in SQL-Nested query optimization
The query optimization phase in query processing plays a crucial role in choosing the most efficient strategy for executing a query. In this paper, we study an optimization technique for SQL-Nested queries using Hints. Hints are additional comments that are inserted into an SQL statement for the purpose of instructing the optimizer to perform the specified operations. We utilize various Hints i...
متن کاملDesigning Query Optimizers for Big Data Problems of The Future
The Vertica SQL Query Optimizer was written from the ground up for the Vertica Analytic Database. Its design, and the tradeoffs we encountered during implementation, support the case that the full power of novel database systems can be realized only with a custom Query Optimizer, carefully crafted exclusively for the system in which it operates.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1996