'Shared lock' diaporamas de présentation

Data Concurrency Control And Data Recovery

829 views • 59 slides

Chapter 9 Transaction Management and Concurrency Control

Chapter 9 Transaction Management and Concurrency Control. Database Systems: Design, Implementation and Management 4th Edition Peter Rob & Carlos Coronel. What Is a Transaction?.

443 views • 44 slides

Chapter 9 Transaction Management and Concurrency Control

Chapter 9 Transaction Management and Concurrency Control. Database Systems: Design, Implementation and Management 4th Edition Peter Rob & Carlos Coronel. What Is a Transaction?.

444 views • 44 slides

Transaction Management

Transaction Management. by Benjamin Nguyen. Overview. Transaction Properties of transaction Pessimistic & optimistic techniques Locking No lock techniques Oracle recovery tools. Transaction.

625 views • 43 slides

Database Transactions

Database Transactions. Transaction. A transaction is an interaction between a user (or application) and a database. A transaction may involve simply accessing the database and reading some of its data. A transaction may involve updating (changing, mutating) some of the data.

559 views • 41 slides

Transaction Management

Transaction Management. Chapter 9. What is a Transaction?. A logical unit of work on a database An entire program A portion of a program A single command The entire series of steps necessary to accomplish a logical unit of work

561 views • 31 slides

Concurrency Control: 18.4 Locking Systems with Several Lock Modes

Concurrency Control: 18.4 Locking Systems with Several Lock Modes. CS257 Spring/2009 Professor: Tsau Lin Student: Suntorn Sae-Eung ID: 212. 18.4 Locking Systems with Several Lock Modes. In 18.3, if a transaction must lock a database element ( X ) either reads or writes,

351 views • 21 slides

Distributed Locking

Distributed Locking. Distributed Locking (No Replication). Assumptions Lock tables are managed by individual sites. The component of a transaction at a site can request locks on the data elements only at that site. Locking X It might seem that there are no messages between sites needed.

407 views • 10 slides

Flock in PHP

Flock in PHP. By Chao Liang. Basic Flock Concept. What is flock? Abbreviation for file locking Why flock? Data consistency. Prevent file corruption. Different types of flock Advisory Mandatory. Flock in PHP. Availability: PHP 3 >= 3.0.7, PHP 4, PHP 5

217 views • 8 slides