Query optimization is a feature of many relational database management systems and other databases such as NoSQL and graph databases. The query optimizer attempts to determine the most efficient way to execute a given query by considering the possible query plans. Generally, the query optimizer cannot be accessed directly by users: once queries are submitted to the database server, and parsed by the parser, they are then passed to the query optimizer where optimization occurs. However, some database engines allow guiding the query optimizer with hints. A query is a request for information from a database. It can be as simple as "find the address of a person with Social Security number 123-45-6789," or more complex like "find the average salary of all the employed married men in California between the ages 30 to 39 who earn less than their spouses." The result of a query is generated by processing the rows in a database in a way that yields the requested information. Since database structures are complex, in most cases, and especially for not-very-simple queries, the needed data for a query can be collected from a database by accessing it in different ways, through different data-structures, and in different orders. Each different way typically requires different processing time. Processing times of the same query may have large variance, from a fraction of a second to hours, depending on the chosen method. The purpose of query optimization, which is an automated process, is to find the way to process a given query in minimum time. The large possible variance in time justifies performing query optimization, though finding the exact optimal query plan, among all possibilities, is typically very complex, time-consuming by itself, may be too costly, and often practically impossible. Thus query optimization typically tries to approximate the optimum by comparing several common-sense alternatives to provide in a reasonable time a "good enough" plan which typically does not deviate much from the best possible result. (Wikipedia).
(New Version Available) Inverse Functions
New Version: https://youtu.be/q6y0ToEhT1E Define an inverse function. Determine if a function as an inverse function. Determine inverse functions. http://mathispower4u.wordpress.com/
From playlist Exponential and Logarithmic Expressions and Equations
Evaluating the composition of Functions
π Learn how to evaluate an expression with the composition of a function and a function inverse. Just like every other mathematical operation, when given a composition of a trigonometric function and an inverse trigonometric function, you first evaluate the one inside the parenthesis. We
From playlist Evaluate a Composition of Inverse Trigonometric Functions
Evaluating the composition of Functions
π Learn how to evaluate an expression with the composition of a function and a function inverse. Just like every other mathematical operation, when given a composition of a trigonometric function and an inverse trigonometric function, you first evaluate the one inside the parenthesis. We
From playlist Evaluate a Composition of Inverse Trigonometric Functions
Evaluating the composition of Functions
π Learn how to evaluate an expression with the composition of a function and a function inverse. Just like every other mathematical operation, when given a composition of a trigonometric function and an inverse trigonometric function, you first evaluate the one inside the parenthesis. We
From playlist Evaluate a Composition of Inverse Trigonometric Functions
Evaluating the composition of Functions
π Learn how to evaluate an expression with the composition of a function and a function inverse. Just like every other mathematical operation, when given a composition of a trigonometric function and an inverse trigonometric function, you first evaluate the one inside the parenthesis. We
From playlist Evaluate a Composition of Inverse Trigonometric Functions
Evaluating the composition of Functions
π Learn how to evaluate an expression with the composition of a function and a function inverse. Just like every other mathematical operation, when given a composition of a trigonometric function and an inverse trigonometric function, you first evaluate the one inside the parenthesis. We
From playlist Evaluate a Composition of Inverse Trigonometric Functions
Evaluating the composition of Functions
π Learn how to evaluate an expression with the composition of a function and a function inverse. Just like every other mathematical operation, when given a composition of a trigonometric function and an inverse trigonometric function, you first evaluate the one inside the parenthesis. We
From playlist Evaluate a Composition of Inverse Trigonometric Functions
Evaluating the composition of inverse functions
π Learn how to evaluate an expression with the composition of a function and a function inverse. Just like every other mathematical operation, when given a composition of a trigonometric function and an inverse trigonometric function, you first evaluate the one inside the parenthesis. We
From playlist Evaluate a Composition of Inverse Trigonometric Functions
Given a quadratic function, find the inverse and determine if a function or not
π Learn how to find the inverse of a quadratic function. A quadratic function is a function whose highest exponent in the variable(s) of the function is 2. The inverse of a function is a function that reverses the "effect" of the original function. One important property of the inverse of
From playlist Find the Inverse of a Function
Reinforcement Learning in the Real World | Paper Analysis
Far from being an academic novelty, reinforcement learning has many real world use cases. In this video we take a look at using reinforcement learning, specifically a version of policy gradient methods known as proximal policy optimization (PPO), to optimize the join ordering for PostgreSQ
From playlist Applications of Reinforcement Learning in the Real World
Nexus Trimester - Paris Koutris (University of Wisconsin)
Worst-Case Optimal Algorithms for Parallel Query Processing Paris Koutris (University of Wisconsin) February 11, 2016 Abstract: We study the communication complexity for the problem of computing a conjunctive query on a large database in a massively parallel setting. In contrast to previ
From playlist Nexus Trimester - 2016 - Distributed Computation and Communication Theme
Near-optimal Evasion of Randomized Convex-inducing Classifiers in Adversarial Environments | AISC
For slides and more information on the paper, visit https://aisc.a-i.science/events/2019-05-23 Discussion lead: Pooria Madani Motivation: Classifiers are often used to detect malicious activities in adversarial environments. Sophisticated adversaries would attempt to find information a
From playlist Generative Models
What is SEO and How Does it Work?
What is SEO and how does it work? This video explains how search engine optimization works and how you can optimize your website to be discovered in search engines like Google. *************************************** Additional SEO Tutorials and Resources SEO for Beginners: A Basic Searc
From playlist SEO Tutorials for Beginners: Learn Search Engine Optimization Step-By-Step
"RM Models for Online Advertising and On-Demand Platforms" by Florin Ciocan - Session II
This mini-course focuses on revenue management applications in online advertising and on-demand platforms with time-sensitive customers that give rise to novel matching and queueing models. For example, online advertising platforms match impressions supply to advertiser demand, whereas on-
From playlist Thematic Program on Stochastic Modeling: A Focus on Pricing & Revenue Managementβ
Best of Strata Santa Clara 2013: SQL on Hadoop Defining the New Generation of Analytic Databases
In this talk we will discuss the unavoidable cost and performance limitations of the connector-based approach employed by many established vendors and explain the long-term significance of Apache Hive's data model along with its influence on next generation SQL-on-Hadoop databases. We will
From playlist O'Reilly Webcasts 2
8.4.7 R8. Google AdWords - Video 6: A Greedy Approach
MIT 15.071 The Analytics Edge, Spring 2017 View the complete course: https://ocw.mit.edu/15-071S17 Instructor: Velibor Misic How to solve the problem using a greedy common sense approach. License: Creative Commons BY-NC-SA More information at https://ocw.mit.edu/terms More courses at htt
From playlist MIT 15.071 The Analytics Edge, Spring 2017
Learn how to evaluate the composition of a function and inverse function
π Learn how to evaluate an expression with the composition of a function and a function inverse. Just like every other mathematical operation, when given a composition of a trigonometric function and an inverse trigonometric function, you first evaluate the one inside the parenthesis. We
From playlist Evaluate a Composition of Inverse Trigonometric Functions
17 Things Developers Need to Know About Databases
Most applications use databases, yet many fail to follow even the most basic best practices causing poor performance, downtime and security incidents. In this presentation, we will look into the foundational best practices you as a Developer should know about databases, with particular
From playlist Databases