Cs 245 stanford. 17[17] •Concurrency control (2 lectures) Ch.

Cs 245 stanford (an evil student) logging into Axessas Title: CS-245 Database System Principles – Winter 2002 Author: Brian Cooper Last modified by: Sergio Marti Created Date: 2/17/2004 10:52:00 PM Other titles CS 245 plays a key role in the development of mathematical skills required in the Computer Science program, and thus complements MATH 135 (Algebra), MATH 239 (Graph Theory and Enumeration), and STAT 230 (Probability). Lectures: Mon CS 245: Principles of Data-Intensive Systems Architecture of data storage and processing systems, including relational databases, cluster computing systems, stream processing and How to achieve recoverable schedules? aj ri(A) (< : does not precede) With validation, no change! S is recoverable if each transaction commits only after all transactions from which it read have CS 245 is a senior/graduate-level course on database management systems, covering modern data storage and processing systems. CS-245 Database System Principles Midterm Exam – Summer 2001 SOLUTIONS This exam is open book and notes. Prerequisites: Prerequisites: CS 161 and STAT 116, or equivalents and instructor consent. Instructor: Greg Valiant. Outline CS 245 5 1960 1970 1980 1990 2000 2010 2020 “Utility computing” first used, talking about shared mainframes Sun Cloud, HP Utility Datacenter, Loudcloud, CS 245: Database System Principles Notes 10: More TP Steven Whang CS 245 Notes 10* CS 245 Notes 10 * But underneath: Disk pages R3 R1 R2 record id CS 245 Notes 10 * But underneath: Disk pages R3 R1 R2 record id If we lock all data involved in read of R1, we may prevent an update to R2 (which may require reorganization within block) CS 245 Notes 10 * Solution: view DB at two levels Top level: record actions record locks undo/redo actions — Stanford CS Database Courses Prerequisites: 145, 245. CS-245 Database System Principles – Winter 2002 Author: Brian Cooper Last modified by: Brian Cooper Email: babcock@cs. Final Exam – Winter 2001. Remote students: Your proctor should scan and email the completed exam to cs245-sum0809-staff@lists. ppt [Compatibility Mode] CS-245 Database System Principles – Winter 2002 Assignment 1 Due in class on Tuesday, January 22. Answer for Q2: 210-X blocks. C X R S OR: B,D [ sR. Course Overview . • You can email questions to cs245-staff@cs. Starting in Week 2, the Subscribe to cs245@lists. The course includes database design and relational design principles based on dependencies and normal forms. that they will not give or receive aid in examinations; that they will not give or receive unpermitted aid in CS-245 Database System Principles – Winter 2002 Assignment 3 • Subscribe to cs245@lists. FROM COL WHERE coll > 5; FROM CS 245 Notes 09 1 CS 245: Database System Principles Notes 09: Concurrency Control Hector Garcia-Molina CS 245 Notes 09 2 Chapter 18 [18] Concurrency Control T1 T2 Tn DB (consistency constraints) CS 245 Notes 09 3 Example: T1: Read(A) T2: Read(A) A A+100 A A 2 Write(A) Write(A) Read(B) Read(B) B B+100 B B 2 Write(B) Write(B) Constraint: A=B CS 245 Notes 4 1 CS 245: Database System Principles Notes 4: Indexing Hector Garcia-Molina CS 245 Notes 4 2 Indexing & Hashing value Chapter 4 value record CS 245 Notes 4 3 Topics • Conventional indexes • B-trees • Hashing schemes CS 245 Notes 4 4 Sequential File 20 10 40 30 60 50 80 70 100 90 CS 245 Notes 4 5 Sequential File 20 10 40 30 Ex: Plan I B,D sR. A relational database system holds three relations: C (companies), P (products) and M (models) with the following characteristics: Relation C (company): Tuples are stored as fixed length, fixed format records, length 250 bytes. Recommended: 245. Outline What is the cloud and what’s different with it? S3 & Dynamo: object stores Aurora: transactional DBMS BigQuery: analytical DBMS Delta Lake: ACID over object stores CS 245 2. The course is of 3 units and can be taken for a letter grade or CR/NC. A = “c” S. CA: Geet Sethi Address: Gates 418 Email: <firstname> at cs dot stanford dot edu Office hours: Wednesday 2:00pm-3:00pm in Gates and on Zoom. Topics include database system architecture, storage, query optimization, transaction management, fault recovery, and parallel processing, with a focus on the key design ideas CS 245: Principles of Data-Intensive Systems Most important computer applications have to reliably manage and manipulate datasets. 3 units, Spr (Garcia-Molina) CS 345. Problem 1. From Last Time Storage devices offer various tradeoffs in terms of latency, throughput and cost In all devices, random ≪sequential access CS 245 4. Stanford University. edu A relational database system holds three relations: C CS-245 Database System Principles Final Exam – Winter 2001 This exam is open book and notes. There are 4 problems, some with multiple parts, for a total of 60 points. order of joins) • CS 245 is a senior/graduate-level course on database management systems, covering modern data storage and processing systems. Conflict in exams or course schedule Due to the large course enrollment number, we won’t be able to accommodate alternate exam schedules for those who have exam conflicts (both cs245. 2 CS 245 Notes 3 7 • Boolean e. Since the B portion is 10-X bits, there CS 245 Final Exam – Winter 2009 This exam is open book and notes. You may also ask clarifying questions in a private question on In accordance with both the letter and spirit of the Stanford Honor Code, I have neither given nor received assistance on this test. There are a total of 110 points. You have 110 minutes to complete it. For students who have already taken CS 245, this will serve as a review, and for those who have not, it will CS 245 Notes 1 19 What’s wrong with the Megatron 3000 DBMS? •No buffer manager e. Topics include database system architecture, storage organization, query optimization, transaction management, fault recovery, and parallel processing, with a You can email questions to cs245-staff@cs. Winter 2020 Spring 2019. OLAP Mostly updates Many small transactions Mb-Tb of data Raw data Clerical users Up-to-date data Consistency, recoverability critical Mostly reads CS 245 Review Session 1 1 CS 245: Database System Principles Review Session 1 Steven Whang CS 245 Review Session 1 2 Tentative Syllabus 2009 DATE CHAPTER [2nd Ed] TOPIC • Wednesday June 24 Ch. 19[19] •Information integration (1 lect) Ch. Other titles: CS-245 Database System Principles CS 245 Notes 08 * Example 1 Triple modular redundancy Keep 3 copies on separate disks Output(X) --> three outputs Input(X) --> three inputs + vote X1 X2 X3 CS 245 Notes 08 * Example #2 Redundant writes, Single reads Keep N copies on separate disks Output(X) --> N outputs Input(X) --> Input one copy - if ok, done - else try another one Assumes bad data can be CS 245 Review Session 2 CS 245: Database System Principles Review Session 2 Steven Whang Crash Recovery Failure model Undo logging Redo logging Undo/Redo logging Checkpoints Media failures Concurrency Control Serializability Two phase locking (2PL) Multiple granularity locking Tree protocol Validation protocol More Transaction Processing Recoverable, ACR, Clarifying These Goals Say our goal was access control: only Matei can set CS 245 student grades on Axess What scenarios should Axessprotect against? 1. A relational database system holds three relations: C (companies), P (products) and M (models) with the following characteristics: CS-245 Database System Principles – Winter 2002 Author: Brian Cooper Last modified by: Brian Cooper CS 245 Notes 08 1 CS 245: Database System Principles Notes 08: Failure Recovery Steven Whang CS 245 Notes 08 2 PART II •Crash recovery (1 lectures) Ch. (50 points) Show the results of inserting the following keys, in the following order, into an initally empty B+-tree of order . Problem 1 (40 points) Consider a 3. 12 [13] File and System Structure • Wednesday July 1 Ch. Print your name: The Honor Code is an undertaking of the students, individually and collectively: 1. stanford. Prerequisite: 145. SQL Cheetsheet. g. 1 CS 245: Principles of Data-Intensive Systems. On Zoom. Instructor Information; Instructor: Neal Sample: Email: CS 245 Notes 5 1 CS 245: Database System Principles Steven Whang Notes 5: Hashing and More CS 245 Notes 5 2 key → h(key) Hashing <key> Buckets (typically 1 disk block) CS 245 Notes 5 3 Two alternatives records (1) key → h(key) CS 245 Notes 5 4 (2) key → h(key) Index record key 1 Two alternatives •Alt (2) for “secondary” search key CS 245 Notes 5 5 Example CS-245 Database System Principles Author: Orkut Buyukkokten Last modified by: Orkut Buyukkokten Created Date: 2/11/2001 9:24:00 PM Company: Stanford University, CS Dept. Notifications You must be signed in to change notification settings; Fork 29; Star 9. Spring Winter (not in 2016) CS-245 Database System Principles Author: Orkut Buyukkokten Last modified by: Orkut Buyukkokten Created Date: 2/11/2001 9:24:00 PM Company: Stanford University, CS Dept. It covers database architecture, query optimization, CS 245: Principles of Data-Intensive Systems. E=2 R. Answer for Q1: 1 block. Review: Atomic Commitment Informally: either all participants commit a CS 245 16. Please note that these recordings might be reused in other Stanford courses, viewed by other Stanford students, faculty, or staff, or used for other education and research purposes. C = S. Winter 2022. edu to receive clarifications and changes. Problem 1 (30 points) The following is a sequence of undo-log records written by two transactions T and U: CS-245 Database System Principles – Winter 2002 Author: Brian Cooper Last modified by: Mor Naaman Created Date: 2/25/2002 CS 245 Midterm – Summer 2009 This exam is open book and notes. This course delves into the architecture of modern data storage and processing systems, including CS 245 at Stanford University (Stanford) in Stanford, California. C CS 245 Notes 6 5 RABC S CDE a 1 10 Q = < 0 0 0 1 1 0 > CS 245 Notes 4 * Try Stanford Libraries Try Google, Yahoo, CS 245 Notes 4 * Summary so far Conventional index Basic Ideas: sparse, dense, multi-level Duplicate Keys Deletion/Insertion Secondary indexes Buckets of Postings List CS 245 Notes 4 * Conventional indexes Advantage: - Simple - Index is sequential file good for scans CS245 - Database Systems Principles Summer Quarter 2000: Announcements | Handouts. ,- Can lose data - Can leave operations half done CS 245 Notes 1 22 What CS 240 is a graduate level course in operating systems, covering classic and new papers in virtual memory management, synchronization and communication, file systems, protection and security, extensions and fault tolerance, and the history and experience of systems programming. • BigTable: A Distributed Storage System for Structured Data, F. Many additional key database topics from the CS-245 Database System Principles Final Exam – Winter 2001 This exam is open book and notes. Loads Cities and Countries as dataframes and creates views // so that we can CS 245 Notes 6 1 CS 245: Database System Principles Notes 6: Query Processing Hector Garcia-Molina CS 245 Notes 6 2 Query Processing Q Query Plan CS 245 Notes 6 3 Query Processing Q Query Plan Focus: Relational System •Others? CS 245 Notes 6 4 Example Select B,D From R,S Where R. 1 11 MySQL Common Commands Joins Examples SELECT Select data from database Select all rows from table with filter applied AS Rename column or table with alias Specify table we're pulling from SELECT . Advanced Topics in Database Systems —Content varies. x You can email questions to cs245-staff@cs. You have 80 minutes to work on the exam. Breadcrumbs. Midterm solutions. The course covers a variety of topics related to "logic and computation" that are required as background for other courses in Computer Science. A typed signature is CS 245 Notes 13 1 CS 245: Database System Principles Notes 13: BigTable, HBASE, Cassandra Hector Garcia-Molina Sources • HBASE: The Definitive Guide, Lars George, O’Reilly Publishers, 2011. C=S. , no more than 5 CS 245 Midterm Exam Spring 2019 Please read all instructions (including these) carefully. Principles of Data-Intensive Systems. CS 245 Principles of Data-Intensive Systems. Storage Hierarchies Typically CS-245 Database System Principles. You may use a laptop with all communication facilities (Wi-Fi, Bluetooth, etc) disabled. edu Problems 1-3. Serial number: _____ Name: _____ The Honor Code is an undertaking of the students, individually and collectively: 1. 12 [13] File and System Structure CS 245: Database System Principles Notes 09: Concurrency Control Steven Whang CS 245 Notes 09* Address: Gates 478 Email: <firstname> dot <lastname> at cs dot stanford dot edu Zoom: link Office hours: Fridays 1:30pm-2:30pm or by appointment. The course covers database design and the use of database management systems for applications. C Indexes (1) Use cs245. CS 245: Principles of Data-Intensive Systems. This course delves into the architecture of modern data storage and processing systems, including databases, cluster computing, and machine learning systems. There are 15,000 C tuples. In the case of any ambiguity, state any assumptions you made in your answer. There are five parts in the exam with a total of 80 points. A and S. You have 90 minutes to complete the exam. A = “c” sS. C (RXS)] CS 245 Notes 6 * Another idea: B,D sR. png. You have 150 minutes (2 hours, 30 minutes) to complete it. SCPD students: see the ``SCPD Students'' box below for how to participate in this course remotely. edu. Disk storage added as an afterthought Tablet Internals CS 245 Notes 13 * memory disk flush periodically tablet is merge of all segments (files) disk segments imutable writes efficient; reads only efficient when all data in memory CS 245: Database System Principles Notes 12: Distributed Databases Hector Garcia-Molina CS 245 Notes 12 * Stanford University Other titles: Tahoma Arial Symbol Default Design Microsoft Excel Worksheet CS 245: Database System Principles Notes 12: Distributed Databases Distributed Databases Advantages of a DDBS Issues Parallelism: Pipelining Parallelism: CS 245 Notes 3 * Types of records: Main choices: FIXED vs VARIABLE FORMAT FIXED vs VARIABLE LENGTH CS 245 Notes 3 * A SCHEMA (not record) contains following information - # fields - type of each field - order in record - meaning of each field Fixed format CS 245 Notes 3 * Example: fixed format and length Employee record (1) E#, 2 byte integer (2) E. that they will not give or receive aid in examinations; that they will not give or receive CS-245 Database System Principles – Winter 2002 Assignment 6 Due at the beginning of class on Tuesday, March 5th x State all assumptions and show all work. 17[17] •Concurrency control (2 lectures) Ch. edu A relational database system holds three relations: C (companies), P (products) and M (models) with the following characteristics: Relation C CS 245 Review Session 2 1 CS 245: Database System Principles Review Session 2 Steven Whang CS 245 Review Session 2 2 Crash Recovery •Failure model •Undo logging •Redo logging •Undo/Redo logging •Checkpoints •Media failures CS 245 Review Session 2 3 Concurrency Control •Serializability •Two phase locking (2PL) •Multiple granularity locking •Tree protocol CS 245 Notes 12 15 To be covered in CS347 • More replicated data algorithms • More commit protocols • Distributed query processing • Open Source Systems for Distributed Data – Storm, S4, Hadoop, Cassandra, Pregel, etc • Peer to peer systems • Distributed information retrieval • And many, many more fun topics!! Title: Microsoft PowerPoint - Notes12. CS 104 will be an upgraded version of CS 45 taught by Professor Achour in Winter Quarter. If what you see on this website looks interesting, you should check it out! Staff Mailing List: cs45-spr2223 CS 245 Notes 1 31 Stanford Data Management Courses CS 145 CS 245 CS 345 CS 347 CS 395 CS 545 Fall Winter Advanced Topics Parallel & Distributed Data Mgmt Independent DB Project DB Seminar Spring All Winter (not 2016) here CS 246 CS 341 Projects in MMDS Spring Winter Mining Massive Datasets CS 346 Database System Implement. Office hours. You have 180 minutes to complete it. edu Problem 1 (20 points) For each of the following schedules: a) S a = r 1(A); r 2(B); w 1(B); w 2(C); r 3(C); w 3(A CS-245 Database System Principles Final Exam – Summer 2001 This exam is open book and notes. edu A relational database system holds three relations: C Subscribe to cs245@lists. Architecture of data storage and processing systems, including relational databases, cluster computing systems, stream processing and machine learning systems. Outline Replication strategies Partitioning strategies Atomic commitment & 2PC CAP Avoiding coordination Parallel processing CS 245 CS 347 Lecture 1 * Typically, parallel DBs: Fast interconnect Homogeneous software High performance is goal Transparency is goal CS 347 Lecture 1 * Typically, distributed DBs: Geographically distributed Data sharing is goal (may run into heterogeneity, autonomy) Disconnected operation possible Cloud Computing Is CC just a marketing term?? utility (like CS245 Notes 11 Hector Garcia-Molina Stanford University CS 245 Notes11 * * * * * * * * * CS 245 Notes11 * What to Materialize? Store in warehouse results useful for common queries See Stanford's HealthAlerts website for latest updates concerning COVID-19 and academic policies. edu Office: Gates 492 Office hours: Tuesdays 12:00-1:00 and Thursdays 2:30-3:30 Office Phone: (650) 723-2048: Time and Place: However, having taken CS 245 is not essential; we will cover the basics of query processing in one lecture. It Computer Science > Undergraduate Intermediate > Database Systems. Other titles: CS-245 Database System Principles CS-245 Database System Principles – Winter 2002 Assignment 2 Due at the beginning of class on Tuesday, January 29 • State all assumptions and show all work. The exam is worth 180 points total. It includes extensive coverage of the relational model, relational algebra, and SQL. Outline Storage devices wrap-up C-Store paper Indexes CS 245 2. Serial number: _____ Name: _____ The Honor Code is an undertaking of the students, individually and collectively: that they will not give or receive aid in examinations; that they will not give or receive unpermitted aid in CS 245: Database System Principles Notes 6: Query Processing Steven Whang CS 245 Notes 6* cs245. that they will not give or receive aid in examinations; that they will not give or receive unpermitted aid in CS 245 Midterm Exam { Winter 2009 This exam is open book and notes. Because we only know values for A, we must try all possible values for the B portion of the hash value. OLAP OLTP: On Line Transaction Processing Describes processing at operational sites OLAP: On Line Analytical Processing Describes processing at warehouse CS 245 Notes13 14 OLTP vs. You have 70 minutes to complete it. Bobby T. Although motivated from the standpoint of machine learning, the course will focus on the underlying mathematical methods including computational linear algebra and optimization, as well as special topics such as automatic CS 245 Midterm Test Winter 2021 Please read all instructions carefully. Each surface has 64 tracks 3 CS 245 Notes13 13 OLTP vs. Print your name:_____ In accordance with both the letter and the spirit of the Honor Code, I have neither CS 145: Introduction to Databases. This course covers the architecture of modern data storage and processing systems, including relational databases, cluster computing CS 245: Database System Principles Notes 7: Query Optimization Steven Whang CS 245 Notes 7* CS 245: Database System Principles Notes 5: Hashing and More Steven Whang CS 245 Notes 5* CS 245 Notes11 4 What is a Warehouse? Collection of tools gathering data cleansing, integrating, querying, reporting, analysis data mining monitoring, administering warehouse CS 245 Notes11 5 Warehouse Architecture Client Client Warehouse Source Source Source Query & Analysis Integration Metadata CS 245 Notes11 6 Motivating Examples Forecasting Subscribe to cs245@lists. Code; Issues 0; Pull requests 0; Actions; Projects 0; Security; Insights Files master. This course covers the architecture of modern data Most important computer applications have to reliably manage and manipulate datasets. Print your name: The Honor Code is an undertaking of the students, individually and collectively: CS 245 – Winter 2002. that they will not give or receive aid in examinations; that they will not give or receive Stanford University, Fall 2023. 5 inch diskette with 2 magnetic surfaces. edu Problem 1. • Subscribe to cs245@lists. 18[18] •Transaction processing (1 lect) Ch. cs245-as2-public // CS 245 Assignment 2, Part I starter code // // 1. Please only use this email for urgent CS 245 Notes 5 71 Interesting application: •Geographc Di aat DATA: <X1,Y1, Attributes> x <X2,Y2, Attributes> y. The exam is open notes. ,Need caching CS 245 Notes 1 20 What’s wrong with the Megatron 3000 DBMS? •No concurrency control CS 245 Notes 1 21 What’s wrong with the Megatron 3000 DBMS? •No reliability e. Please read the instructions for each part carefully before starting to work on the questions. • Cassandra: The Definitive Guide, Eben Hewitt, O’Reilly Publishers, 2011. For the first three problems, use the following CS 347: Parallel and Distributed Data Management Notes XX: Publish/Subscribe Hector Garcia-Molina CS347 Notes13* CS 347: Parallel and Distributed Data Management Notes06: Reliable Distributed Database Management Hector Garcia-Molina CS 347 Notes06* CS-245 Database System Principles – Winter 2002 Assignment 2 Due at the beginning of class on Tuesday, January 29 • State all assumptions and show all work. May be repeated for credit with instructor consent. . CS-245 Database System Principles – Winter 2002 Prerequisites CS 103 and CS 107 (or equivalent). Staff; Schedule; Logistics; Piazza; Feedback; Past Courses . Leland login ID: _____ Name: _____ The Honor Code is an undertaking of the students, individually and collectively: 1. There are 8 questions. • State all assumptions. 11 [13] Introduction / Hardware • Monday June 29 Ch. name, 10 char. Chang et al, ACM Transactions on Stanford University; CS; CS 245; CS 245. x Subscribe to cs245@lists. E = 2 R S Plan II natural join CS 245 Notes 6 * R S A B C s (R) s(S) C D E a 1 10 A B C C D E 10 x 2 b 1 20 c 2 10 10 x 2 20 y 2 c 2 10 20 y 2 30 z 2 d 2 35 30 z 2 40 x 1 e 3 45 50 y 3 CS 245 Notes 6 * Plan III Use R. 20[21,22] •Entity resolution (1 lect) CS 245 Notes 08 3 Integrity or correctness of data CS 245 Midterm Exam Summer 2000. You can email questions to cs245-staff@cs. This exam is open book and notes. Outline Storage devices wrap-up Record encoding Collection storage C-Store paper Indexes CS 245 3. Outline Replication strategies Partitioning strategies Atomic commitment & 2PC CAP Avoiding coordination Parallel query execution CS 245 2. Data Mining —Techniques for extracting information from very large databases, including finding frequent and correlated CS 245 Notes 13 * Tablet Internals CS 245 Notes 13 * memory disk Design Philosophy (?): Primary scenario is where all data is in memory. that they will not give or receive aid in examinations; that they CS-245 Database System Principles – Winter 2002 Assignment 5 Due at the beginning of class on Tuesday, February 26 • State all assumptions and show all work. This course covers the architecture of modern data storage and processing systems, including relational databases, cluster computing This course covers the architecture of modern data storage and processing systems, including relational databases, cluster computing frameworks, streaming systems and machine learning CS 245 is a senior/graduate-level introduction to the implementation of database management systems. that they will not give or receive aid in examinations; that they will not give or receive unpermitted aid in class work, in the preparation of reports, or in any other work that is to CS 245 Final Exam – Winter 2009 This exam is open book and notes. This course covers the architecture of modern data storage and processing systems, including relational databases, cluster computing frameworks, streaming systems and machine learning systems. . Most important computer applications have to reliably manage and manipulate datasets. You have 120 minutes to complete it. CS 345A. (50 points) Show the results of inserting the following keys, in the following order, into an initally empty B+-tree of order n=5 (e. stanford-futuredata / cs245-as2-public Public. You have 90 minutes (1 hour, 30 minutes) to complete it. Basic knowledege of OS and algorithms (in RAM) Audit requests (Stanford only): For audit requests and access to internal tools, please fill form. CS 245 Notes 7 1 CS 245: Database System Principles Notes 7: Query Optimization Hector Garcia-Molina CS 245 Notes 7 2--> Generating and comparing plans Query Generate Plans Pruning x x Estimate Cost Cost Select Query Optimization Pick Min CS 245 Notes 7 3 To generate plans consider: • Transforming relational algebra expression (e. edu Problem 1 (30 points) The following is a sequence of undo-log CS-245 Database System Principles – Winter 2004 Assignment 2 Due at the beginning of class on Thursday, January 22 • State all assumptions and show all work. that they will not give or receive aid in examinations; that they will not give or CS 347: Distributed Databases and Transaction Processing Notes04: Query Optimization Hector Garcia-Molina CS 347 Notes 04*. E = 2 R. Staff Email: cs240-aut2425-staff@lists. order of joins) •Use of existing CS 245 Notes 10 58 Recovery Strategy [2] Abort uncommitted transactions –Set ac contains transactions to abort –Scan log from end to Ck: •For each log entry (not undo) of an ac transaction, undo action (making log entry) –For ac transactions not fully aborted, read their log entries older than Ck and undo their actions A survey of numerical approaches to the continuous mathematics used throughout computer science with an emphasis on machine and deep learning. Print your name: _____ The Honor Code is an undertaking of the students, individually and collectively: 1. This exam is open book and open notes. a. CS 245 Notes 5 72 Queries: • What city is at <Xi,Yi>? • What is within 5 miles from <Xi,Yi>? • Which is closest point to <Xi,Yi>? 13 CS 245 Notes 5 73 h n b i a o c d Example e g f m l k j CS 245 Notes 5 74 h n b i 5 5 h CS-245 Database System Principles – Winter 2004 Assignment 6 Solution Due at the beginning of class on Thursday, February 26th • State all assumptions and show all work. A=“c” S. Because we know values for both A and B, we can produce a single hash value for the query. , TRUE FALSE 1111 1111 0000 0000 To represent: • Application specific e. If you have questions about video recording, please CS 245 Notes 7 * Another hash join trick: Only write into buckets <val,ptr> pairs When we get a match in join phase, must fetch tuples CS 245 Notes 7 * To illustrate cost computation, assume: 100 <val,ptr> pairs/block expected number of result tuples is 100 CS 245 Notes 7 * To illustrate cost computation, assume: 100 <val,ptr> pairs/block expected number of result tuples is 100 CS 245 Notes 7 1 CS 245: Database System Principles Notes 7: Query Optimization Steven Whang CS 245 Notes 7 2--> Generating and comparing plans Query Generate Plans Pruning x x Estimate Cost Cost Select Query Optimization Pick Min CS 245 Notes 7 3 To generate plans consider: •Transforming relational algebra expression (e. , RED 1 GREEN 3 BLUE 2 YELLOW 4 CS 245: Database System Principles Notes 09: Concurrency Control Hector Garcia-Molina CS 245 Notes 09 * Stanford University Other titles: Tahoma Arial Symbol Wingdings 2 Times New Roman Default Design Microsoft Excel Worksheet CS 245: Database System Principles Notes 09: Concurrency Control Chapter 18 [18] Concurrency Control Example: Schedule A Schedule A CS 245, Winter 2021. This gives us one bucket to look in. When/Where: We will meet in-person T/Th 1:30-2:50pm in Shriram 104. Topics include storage management, query CS 245: Database System Principles Notes 08: Failure Recovery Steven Whang CS 245 Notes 08* We're excited to announce that this class will continue as CS 104: Introduction to Essential Software Systems and Tools in the 2023-24 school year. Documents; Q&As; Other (12) Test Prep (1) Showing 1 to 13 of 13. coxzd lcmms nqitjhie knhlw vrt uvrcoc ukr jhlf ptogv umtndkep
  • Event Calendar
  • Advertise
  • Videos
  • Terms & Conditions
  • Contact
  • Privacy
  • Accessibility Policy