This document discusses transaction processing in online transaction processing (OLTP) environments. It covers typical OLTP environments like airline, banking, and trading systems. It also covers topics like transactions being atomic units of execution that must have ACID (atomicity, consistency, isolation, durability) properties and can be in different states during processing. Transactions are sequences of database operations that must generate a consistent database when applied to a consistent one.

1. 1. Typical OLTP Environments
2. Recovery
3. Acid Property of Transactions
4. Transaction States

2. 1. Typical OLTP Environments
♦ Introduction
▪ A transaction is a logical unit of program execution.
- work on concurrency and recovery.
▪ A sequence of operations including database operations.
- atomic on concurrency and recovery.
▪ An atomic execution unit .
- when applied to a consistent database, generates a consistent
but possibly different database.

3. 1. Typical OLTP Environments
♦ Typical OLTP(Online Transaction Processing) Environments
▪ Airline/ railway reservation systems
▪ Banking systems (atm, eft, ...)
▪ Trading and brokerage systems
▪ Hotel / hospital systems
▪ Standard commercial systems