Tausif Techie

 

MDSTPM Model in Mobile Database Systems

The MDSTPM (Mobile Distributed Short-Term Transaction Processing Model) is a transaction processing model designed specifically for mobile environments where frequent disconnections, limited bandwidth, and mobility pose significant challenges to data consistency and reliability.

🔹 1. Definition of MDSTPM

• MDSTPM stands for Mobile Distributed Short-Term Transaction Processing Model.

• It supports execution of transactions in mobile databases with minimal delay and efficient resource use.

🔹 2. Key Features

• Supports short-lived transactions suited to mobile environments.

• Allows partial execution and local commit at the mobile host.

• Ensures global consistency through coordination with fixed hosts.

🔹 3. Architecture

• Consists of Mobile Hosts (MH), Fixed Hosts (FH), and Base Stations (BS).

• MH performs local transactions; FH ensures global commit and coordination.

🔹 4. Local Transaction Execution

• Mobile devices execute transactions locally to reduce dependency on continuous connection.

• Transactions are temporarily committed (tentative commit) at the mobile host.

🔹 5. Global Commit Protocol

• Upon reconnection, MH sends transaction logs to FH for final commit.

• FH ensures atomicity and consistency using a lightweight commit protocol.

🔹 6. Fault Tolerance

• MDSTPM provides mechanisms for rollback and recovery during failures or disconnections.

🔹 7. Significance

• Reduces latency and improves responsiveness in mobile apps.

• Enhances system scalability and reliability in distributed mobile environments.

👉 Thus, the MDSTPM model effectively supports reliable and efficient transaction execution in mobile database systems.