database systems: dis 308
... INTRODUCTION Databases are part of our day to day lives. When we are registering as students, we are interacting with databases, when we go to the bank, pay our electricity bills or pay water bills our accounts are on a database, even when we are browsing the net; information is coming from several ...
... INTRODUCTION Databases are part of our day to day lives. When we are registering as students, we are interacting with databases, when we go to the bank, pay our electricity bills or pay water bills our accounts are on a database, even when we are browsing the net; information is coming from several ...
Database technology
... … you allocate space on one (or several) devices … there is automatically created a transaction log … you have to use the “sa” account … you will use the Enterprise Manager or the CREATE DATABASE command ...
... … you allocate space on one (or several) devices … there is automatically created a transaction log … you have to use the “sa” account … you will use the Enterprise Manager or the CREATE DATABASE command ...
DISTRIBUTED DATABASES
... concurrent accesses and system failures (see Transaction Management, Transaction Processing). DBMSs provide support for what is called ACID (Atomic, Consistent, Isolated, and Durable) transactions: a transaction is an atomic unit of execution, either all of its actions are completed or none of them ...
... concurrent accesses and system failures (see Transaction Management, Transaction Processing). DBMSs provide support for what is called ACID (Atomic, Consistent, Isolated, and Durable) transactions: a transaction is an atomic unit of execution, either all of its actions are completed or none of them ...
Management of organizational memories
... A transaction is a series of actions to be taken on the database such that they must be entirely completed or aborted A transaction is a logical unit of work Example BEGIN TRANSACTION; EXEC SQL INSERT …; EXEC SQL UPDATE …; EXEC SQL INSERT …; COMMIT TRANSACTION; ...
... A transaction is a series of actions to be taken on the database such that they must be entirely completed or aborted A transaction is a logical unit of work Example BEGIN TRANSACTION; EXEC SQL INSERT …; EXEC SQL UPDATE …; EXEC SQL INSERT …; COMMIT TRANSACTION; ...
lecture28
... U1: If T modifies X, then must be
written to disk before X is output to disk
U2: If T commits, then must
be written to disk only after all changes by
T are output to disk
...
... U1: If T modifies X, then
Concurrency Control
... Allow people to lock at each level, but with a special protocol using new “intention” locks: ...
... Allow people to lock at each level, but with a special protocol using new “intention” locks: ...
How is database integrity assured within the relational database
... importance to the user and the designer. Compare the file system with the five database systems discussed in this chapter in terms of data and structural independence. Ch2: What is a relational database, and how does its logical structure differ from that of the network and hierarchical databases? W ...
... importance to the user and the designer. Compare the file system with the five database systems discussed in this chapter in terms of data and structural independence. Ch2: What is a relational database, and how does its logical structure differ from that of the network and hierarchical databases? W ...
Management of organizational memories
... A transaction is a series of actions to be taken on the database such that they must be entirely completed or aborted A transaction is a logical unit of work Example BEGIN TRANSACTION; EXEC SQL INSERT …; EXEC SQL UPDATE …; EXEC SQL INSERT …; COMMIT TRANSACTION; ...
... A transaction is a series of actions to be taken on the database such that they must be entirely completed or aborted A transaction is a logical unit of work Example BEGIN TRANSACTION; EXEC SQL INSERT …; EXEC SQL UPDATE …; EXEC SQL INSERT …; COMMIT TRANSACTION; ...
Introduction
... Understand and model the problem Research and understand related work (1-2 papers) Propose some new approach (creativity will be evaluated) Implement some part ...
... Understand and model the problem Research and understand related work (1-2 papers) Propose some new approach (creativity will be evaluated) Implement some part ...
DOC
... Conceptual Data Models for Database Design - An Example Database Application Entity Types, Entity Sets, Attributes, and Keys - Relationship Types, Relationship Sets, Roles, and Structural Constraints - Weak Entity Types - Refining the ER Design for the COMPANY Database - ER Diagrams, Naming Conventi ...
... Conceptual Data Models for Database Design - An Example Database Application Entity Types, Entity Sets, Attributes, and Keys - Relationship Types, Relationship Sets, Roles, and Structural Constraints - Weak Entity Types - Refining the ER Design for the COMPANY Database - ER Diagrams, Naming Conventi ...
Introduction to Database Systems
... use extends beyond this to many applications Large amounts of data Storage with efficient update and retrieval. File organization and indexing, Relational model and query languages: relational algebra and SQL. Query and transaction processing and Optimization Concurrency and Data Recovery ...
... use extends beyond this to many applications Large amounts of data Storage with efficient update and retrieval. File organization and indexing, Relational model and query languages: relational algebra and SQL. Query and transaction processing and Optimization Concurrency and Data Recovery ...
CS6302 DATABASE MANAGEMENT SYSTEMS L T P C 3 0 0 3
... DATABASE SECURITY: Data Classification-Threats and risks – Database access Control – Types of Privileges –Cryptography- Statistical Databases.- Distributed Databases-ArchitectureTransaction Processing-Data Warehousing and Mining-Classification-Association rulesClustering-Information Retrieval- Relev ...
... DATABASE SECURITY: Data Classification-Threats and risks – Database access Control – Types of Privileges –Cryptography- Statistical Databases.- Distributed Databases-ArchitectureTransaction Processing-Data Warehousing and Mining-Classification-Association rulesClustering-Information Retrieval- Relev ...
Reliability and Security by Neyha Amar (5/06)
... Access privileges restrict (and allow) access by specific users to specific operations on specific objects. ...
... Access privileges restrict (and allow) access by specific users to specific operations on specific objects. ...
Learning Fingerprints for a Database Intrusion Detection System
... overruled because of oversummarised fingerprints, but also illegitimate fingerprints are included to the signature database. ...
... overruled because of oversummarised fingerprints, but also illegitimate fingerprints are included to the signature database. ...
Overview of Databases and DBMS
... • Isolation: No two transactions should be executed at the same time. • Durability: Effects of a transaction can never be lost • Consistency: Constraints are satisfied all the time ...
... • Isolation: No two transactions should be executed at the same time. • Durability: Effects of a transaction can never be lost • Consistency: Constraints are satisfied all the time ...
Building Deterministic Transaction Processing Systems without
... order (which can be either the application layer or a special preprocessor in the database system) • the execution unit, which (aided by the reconnaissance knowledge) deterministically executes the original transaction if the indexes have not meanwhile been updated in a manner that changes its read- ...
... order (which can be either the application layer or a special preprocessor in the database system) • the execution unit, which (aided by the reconnaissance knowledge) deterministically executes the original transaction if the indexes have not meanwhile been updated in a manner that changes its read- ...
chapter19
... system should ensure that its updates are not reflected in the database, else inconsistency will result. Duribility : once the user has been notified that the transaction has been completed, the updates to the database by the transaction must persist despite failures. Isolation : if between steps 3 ...
... system should ensure that its updates are not reflected in the database, else inconsistency will result. Duribility : once the user has been notified that the transaction has been completed, the updates to the database by the transaction must persist despite failures. Isolation : if between steps 3 ...
slides - the David R. Cheriton School of Computer Science
... Teach the use of a database management system (DBMS) by treating it as a black box, focusing only on its functionality and its interfaces. • Sub-objectives: understand the principles of relational database management systems and their languages – SQL 2 learn the methodology for building applications ...
... Teach the use of a database management system (DBMS) by treating it as a black box, focusing only on its functionality and its interfaces. • Sub-objectives: understand the principles of relational database management systems and their languages – SQL 2 learn the methodology for building applications ...
Module Descriptor 2014/15 School of Computer Science and Statistics.
... Analyse and assess various database concurrency protocols and algorithms to assess their performance and relative appropriateness in differing operating environments. ...
... Analyse and assess various database concurrency protocols and algorithms to assess their performance and relative appropriateness in differing operating environments. ...
Introduction to Database Systems
... (Write-Ahead Log or WAL protocol). After a crash, the effects of partially executed transactions are undone using the log. ...
... (Write-Ahead Log or WAL protocol). After a crash, the effects of partially executed transactions are undone using the log. ...