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Transaction Models (Transaction Processing (TP) monitor (Services…
Transaction Models
Atomic disk writes
Duplex write
Cyclic redundancy check
How it works
Logged write
Types of actions
Unprotected actions
Protected actions
Real actions
Structure of transactions
Flat transactions
Transactions with save points
Nested transactions
Commit rule
Roll back rules
Visibility rules
Transaction Processing (TP) monitor
Computing styles
Batch processing
Time sharing
Real-time processing
Client-server processing
Transaction-oriented processing
Services
Heterogeneity
Control communication
Terminal management
Presentation service
Context management
Start/Restart
Structure
One process per terminal performing all possible requests
One process for all terminals performing all requests
Multiple communication processes and servers
Components
Presentation service
Queue management