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Homework 3
Practical Implementation of A Simple Rational Database Management System
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1-2Wei-Pang Yang, Database Lab. CIS, NCTU
Contents
Introduction
Requirements
Submissions
Demo Examples
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Introduction
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1-4Wei-Pang Yang, Database Lab. CIS, NCTU
Introduction Front End
Provide a friendly user interface.
Parse SQL statement into an execution plan.
Display result into a table grid.
Query Processor Translate execution plan into relational
algebra operations.
Storage System Deal with the data storage in files.
Manipulate the internal organization of relations.
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1-5Wei-Pang Yang, Database Lab. CIS, NCTU
Query in SQL: SELECT CUSTOMER. NAME FROM CUSTOMER, INVOICE WHERE REGION = 'N.Y.' AND AMOUNT > 10000 AND CUTOMER.C#=INVOICE.C
Internal Form :
( (S SP)
Operator : SCAN C using region index, create C SCAN I using amount index, create I SORT C?and I?on C# JOIN C?and I?on C# EXTRACT name field
Calls to Access Method: OPEN SCAN on C with region index GET next tuple . . .
Calls to file system: GET10th to 25th bytes from block #6 of file #5
Language Processor
Optimizer
Operator Processor
Access Method
File System
database
QueryProcessor
Storage Systeme.g.B-tree; Index; Hashing
DBMS
Front End Front End
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Requirements
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1-7Wei-Pang Yang, Database Lab. CIS, NCTU
Requirements Group-work project
3 persons per group.
Single person is not allowed.
Programming language No restriction.
Should provide a friendly UI.
Should deal with SQL commands. MUST follow the syntax of the demo example.
BUT, You can extend the syntax to support other functions.
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1-8Wei-Pang Yang, Database Lab. CIS, NCTU
Requirements (cont.)
Should achieve basic functions Create and delete relations.
Contain multiple attributes in one relation.
Provide basic attribute type such as integer, real, and string.
Support relational algebra such as select, project, and join.
Support predicate with boolean expression such as AND and OR.
View or save results as a relation.
Insert tuples into a relation.
Update and delete tuples from a relation under a specified condition.
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1-9Wei-Pang Yang, Database Lab. CIS, NCTU
Requirements (cont.)
More information http://
www.database.cis.nctu.edu.tw/courses/wpyang/2004S-5138/FinalProject2004.htm
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1-10Wei-Pang Yang, Database Lab. CIS, NCTU
Bonus
Including but not restricted
Query Processor Query optimization.
Storage System B-tree index.
Transaction management.
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Submissions
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1-12Wei-Pang Yang, Database Lab. CIS, NCTU
Submissions Hard copy report
A detail description of system design and implementation.
Including but not restricted• Your own extended syntax of query language.• The system architecture.• The interfaces between components.
Level of participation, such as
student A: 30%, student B: 40%, student C: 30%
Your system in a floppy disk. Source code.
Execution file.
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1-13Wei-Pang Yang, Database Lab. CIS, NCTU
Deadline
Demo: Location:
The schedule will be announced. Please refer to http://www.database.cis.nctu.edu.tw/courses.
Submissions:
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1-14Wei-Pang Yang, Database Lab. CIS, NCTU
Grading
Report: 20%.
System demo: 80%
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Demo Examples
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1-16Wei-Pang Yang, Database Lab. CIS, NCTU
Demo Example
Q1: Create Relation Create Table T;
Create Table S (char[2] S#, char[10] Sname, int Status, char[10] City);
Create Table P (char[2] P#, char[10] Pname, real Weight);
Create Table SP (char[2] S#, char[2] P#, int Qty);
Q2: Drop Relation
Drop Table T;
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1-17Wei-Pang Yang, Database Lab. CIS, NCTU
Demo Example (cont.) Q3: Insert single tuple
Insert into S (S#, Sname, Status, City) value (“S1”,”Smith”,20,”London”); Insert into S (S#, Sname, Status, City) value (“S2”,”Jones”,10,”Paris”); Insert into S (S#, Sname, Status, City) value (“S3”,”Black”,30,”Paris”); Insert into P (P#, Pname, Weight) value (“P1”,”Nut”,17.20); Insert into P (P#, Pname, Weight) value (“P2”,”Bolt”,20); Insert into P (P#, Pname, Weight) value (“P3”,”Screw”,10.50); Insert into P (P#, Pname, Weight) value (“P4”,”Test”,5.5); Insert into SP (S#, P#, Qty) value (“S1”,”P1”,300); Insert into SP (S#, P#, Qty) value (“S1”,”P2”,200); Insert into SP (S#, P#, Qty) value (“S2”,”P2”,400); Insert into SP (S#, P#, Qty) value (“S3”,”P3”,100);
Bonus: Insert multiple tuples Insert into P(P#, Pname, Weight) Select S#, Sname, Status from S where Sta
tus > 10;
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1-18Wei-Pang Yang, Database Lab. CIS, NCTU
Demo Example (cont.)
Q4: Update Update P Set Pname=”Nutt”, Weight=12.9
Where Weight < 15
Q5: Delete Delete From P Where Weight < 15;
Q6: Select Select * From S;
Select * From P;
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1-19Wei-Pang Yang, Database Lab. CIS, NCTU
Demo Example (cont.)
Q7: Select + Project
Select S#,Sname,City From S;
Q8: Select + Join
Select * From S, SP Where S.S#=SP.S#
Q9: Select + Project + Join (two relations)
Select S.S#, SP.P#, SP.Qty From S, SP Where S.S#=SP.S#;
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1-20Wei-Pang Yang, Database Lab. CIS, NCTU
Demo Example (cont.)
Q10a: Select + Project + Join + And (two relations)
Select S.S#, SP.P#, SP.Qty From S, SP
Where S.S#=SP.S# and SP.Qty < 400;
Q10b: Select + Project + Join + And (more than two re
lations)
Select S.Sname, P.Pname, SP.Qty From S, SP, P
Where S.S#=SP.S# and P.P#=SP.P#;
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1-21Wei-Pang Yang, Database Lab. CIS, NCTU
Demo Example (cont.)
Q11a: Select + Project + Join + multiple And (two relat
ions)
Select S.S#, SP.P#, SP.Qty From S, SP
Where S.S#=”S1” and S.S#=SP.S# and SP.Qty>200;
Q11b: Select + Project + Join + multiple And (more th
an two relations)
Select S.Sname, P.Pname, SP.Qty From S, SP, P
Where S.S#=”S1” and S.S#=SP.S# and P.P#=SP.P#;
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1-22Wei-Pang Yang, Database Lab. CIS, NCTU
Demo Example (cont.)
Q12a: Select + Project + Join + And + Or (two relation
s)
Select S.S#, SP.P#, SP.Qty From S, SP
Where S.S#=SP.S# and (SP.Qty >=400 or SP.Qty <=200);
Q12b: Select + Project + Join + And + Or (more than t
wo relations)
Select S.Sname, P.Pname, SP.Qty From S, SP, P
Where S.S#=SP.S# and P.P#=SP.P#
and (S.S#=”S1” or S.S#=”S2”);
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1-23Wei-Pang Yang, Database Lab. CIS, NCTU
Demo Example (cont.) Q13a: Transaction Abort
Transaction Begin;Insert into S (S#, Sname, Status, City) value (“S4”,”Test”,100,”Taipei”);Transaction Abort;
Select * from S;
Q13b: Transaction Commit Transaction Begin;
Insert into S (S#, Sname, Status, City) value (“S4”,”Test”,100,”Taipei”);Transaction Commit;
Quit the DBMS process
Select * from S;
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1-24Wei-Pang Yang, Database Lab. CIS, NCTU
Demo Example (cont.)
Q14a: Create Index
Create Index SI ON S (Status ASC);
Select * from S;
Q14b: Drop Index
Drop Index SI ;
Select * from S;
Q15: Save the query result
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1-25Wei-Pang Yang, Database Lab. CIS, NCTU
Grading SpecificationCreate Relation /3
Drop Relation /3
Integer Type Operation /3
Real Type Operation/3
String Type Operation /3
Insert a tuple/4
Insert n tuples /4
Update n tuples/4
Delete n tuples/3
Select/4
Select + Project/4
Select + And/4
Select + Or/4
Select + n And/3
Select + n Or/3
Select + And + Or/3
Select + Join/4
Select + Project + Join/4
Select + Project + Join (2)/4
Select + Project + Join + And (2)/4
Select + Project + Join + And (n)/3
Select + Project + Join + n And (2) /3
Select + Project + Join + n And (n)/3
Select + Project + Join + And + Or (2)/4
Select + Project + Join + And + Or (n)/3
Save the result/3
Memo
Transaction Abort/3
Transaction Commit/3
Index Create/Drop/4