2021/4/28 COMP9315 21T1 – Prac Exercise 01 COMP9315 21T1 Prac Exercise 01 DBMS Implementation Setting up your PostgreSQL Server Aims This exercise aims to get you to: set up your directories on the /srvr file system install a PostgreSQL database server on /srvr You ought to get it done by the middle of Week 2. […]
CS计算机代考程序代写 database file system SQL 2021/4/28 COMP9315 21T1 – Prac Exercise 01 Read More »
COMP9315 21T1 – Exercises 06 COMP9315 21T1 Exercises 06 Implementing Selection on Multiple Attributes (N-d) DBMS Implementation [Show with no answers] [Show with all answers] Consider a file of n=50000 tuples allocated across b=1024 pages using a multi-attribute hash function giving d=10 hash bits. The tuples in this file have four fields R(w,x,y,z) and
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2021/4/28 Implementing Durability Implementing Durability Atomicity/Durability Durability Dealing with Transactions Architecture for Atomicity/Durability Execution of Transactions Transactions and Buffer Pool >> COMP9315 21T1 ♢ Implementing Durability ♢ [0/13] https://cgi.cse.unsw.edu.au/~cs9315/21T1/lectures/tx-durability/slides.html 1/15 2021/4/28 Implementing Durability ❖ Atomicity/Durability Reminder: Transactions are atomic if a tx commits, all of its changes persist in DB if a tx aborts, none
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2021/4/28 Catalogs Catalogs Database Objects Catalogs Representing Databases Representing Tables >> COMP9315 21T1 ♢ Catalogs ♢ [0/11] cgi.cse.unsw.edu.au/~cs9315/21T1/lectures/catalogs/slides.html 1/13 2021/4/28 Catalogs ∧ >> ❖ Database Objects RDBMSs manage different kinds of objects databases, schemas, tablespaces relations/tables, attributes, tuples/records constraints, assertions views, stored procedures, triggers, rules Many objects have names (and, in PostgreSQL, some have OIDs).
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COMP9315 21T1 Exercises 01 DBMSs, PostgreSQL, Catalogs DBMS Implementation [Show with no answers] [Show with all answers] Some of these questions require you to look beyond the Week 01 lecture material for answers. Some of the questions preempt material that we’ll be looking at over the next few weeks. To answer some questions, you
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COMP9315 Sample Exam COMP9315 Sample Exam The University of New South Wales COMP9315 DBMS Implementation Sample Exam DBMS Implementation [Instructions] [Notes] [PostgreSQL] [C] [Q1] [Q2] [Q3] [Q4] [Q5] [Q6] [Q7] [Q8] Question 5 (9 marks) Consider the following database schema: create table R ( id integer primary key, rval text unique, tid integer — references
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2021/4/28 CATC Indexing CATC Indexing Signature-based indexing Concatenated Codewords (CATC) CATC Example CATC Queries Example SIMC Query CATC Parameters Query Cost for CATC Variations on CATC Comparison with SIMC >> COMP9315 21T1 ♢ CATC Indexing ♢ [0/12] https://cgi.cse.unsw.edu.au/~cs9315/21T1/lectures/sig-catc/slides.html 1/14 2021/4/28 CATC Indexing ∧ >> ❖ Signature-based indexing Reminder: le organisation for signature indexing (two les)
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2021/4/28 Buffer Pool Buffer Pool Buffer Pool Page Replacement Policies Effect of Buffer Management >> COMP9315 21T1 ♢ Buffer Pool ♢ [0/16] https://cgi.cse.unsw.edu.au/~cs9315/21T1/lectures/buffers/slides.html 1/18 2021/4/28 Buffer Pool ❖ Buffer Pool ∧ >> COMP9315 21T1 ♢ Buffer Pool ♢ [1/16] https://cgi.cse.unsw.edu.au/~cs9315/21T1/lectures/buffers/slides.html 2/18 2021/4/28 Buffer Pool ❖ Buffer Pool (cont) Aim of buffer pool: hold pages read
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2021/4/28 Transaction Processing Transaction Processing Transaction Processing Transaction Terminology Schedules Transaction Anomalies >> COMP9315 21T1 ♢ Transaction Processing ♢ [0/12] https://cgi.cse.unsw.edu.au/~cs9315/21T1/lectures/tx-intro/slides.html 1/14 2021/4/28 Transaction Processing ❖ Transaction Processing A transaction (tx) is … a single application-level operation performed by a sequence of database operations A transaction effects a state change on the DB ∧ >>
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COMP9315 21T1 Exercises 02 Storage: Disks, Files, Buffers DBMS Implementation [Show with no answers] [Show with all answers] 1. 2. What is the purpose of the storage management subsystem of a DBMS? [show answer] 3. 4. Describe some of the typical functions provided by the storage management subsystem. [show answer] 5. 6. [Based on
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