Unit 822: Mobile Database Systems

1. Introduction to Mobile Database Systems

• Overview of mobile databases
• Unique challenges in mobile environments
  • Limited storage capacity
  • Intermittent and unreliable connectivity
  • Resource constraints (battery, CPU, memory)
• Requirements for mobile databases
  • Lightweight footprint
  • Robust synchronization
  • Scalability and flexibility

2. Mobile Data Synchronization

• Importance of synchronization
• Synchronization architectures
  • Client-server synchronization
  • Peer-to-peer synchronization
• Techniques for data consistency
  • Timestamp-based synchronization
  • Version vectors
  • Operational transformation
• Conflict detection and resolution strategies
  • Manual vs automatic conflict resolution
  • Conflict-free replicated data types (CRDTs)
  • Last-write-wins, merge policies

3. Mobile Database Design

• Data modeling for mobile environments
  • Entity-relationship modeling considerations
  • Normalization vs denormalization trade-offs
• Schema design tailored for mobile apps
  • Lightweight schemas
  • Handling schema evolution and migration
• Indexing techniques
  • B-tree, hash indexes adapted for mobile
  • Index maintenance under resource constraints
• Optimization strategies
  • Query optimization
  • Data compression
  • Caching mechanisms

4. Mobile Database Security

• Security challenges in mobile databases
  • Vulnerabilities due to mobile network exposure
  • Device theft and data leakage risks
• Data encryption
  • At-rest encryption techniques
  • In-transit encryption (TLS/SSL)
• Authentication mechanisms
  • Multi-factor authentication
  • OAuth and token-based systems
• Authorization and access control
  • Role-based access control (RBAC)
  • Attribute-based access control (ABAC)
• Secure data transmission best practices

5. Query Processing in Mobile Databases

• Query execution planning
  • Cost-based optimization
  • Heuristic-based optimization
• Indexing to improve query performance
• Query caching strategies
  • Local caching
  • Cache invalidation policies
• Handling query processing with limited resources
  • Approximate query processing
  • Adaptive query processing

6. Mobile Data Storage and Retrieval

• Storage mechanisms
  • Local storage options (SQLite, Realm, Core Data)
  • Cloud storage integration
  • Hybrid storage approaches
• Offline data access techniques
  • Data synchronization post-offline usage
  • Conflict handling after offline periods
• Efficient data retrieval methods
  • Pagination and lazy loading
  • Query optimization for mobile data access

7. Mobile Database Connectivity

• Connectivity challenges
  • Network latency and bandwidth limitations
  • Handling intermittent and unstable connections
• Techniques to manage connectivity
  • Connection pooling
  • Retry and backoff strategies
  • Data batching and compression
• Ensuring data consistency in distributed environments
  • Eventual consistency models
  • Strong consistency techniques

8. Mobile Database Application Development

• Choosing the appropriate mobile database management system
  • Comparison of popular mobile DBMS (SQLite, Realm, Firebase, Couchbase Lite)
• Designing user interfaces for database interaction
  • Responsive UI for data display
  • Handling synchronization status and conflict notifications
• Implementing data synchronization features
  • Background sync
  • Push notifications for data changes
• Performance optimization techniques
  • Minimizing battery and data usage
  • Efficient query and transaction management

Summary

This unit equips learners with comprehensive knowledge and practical skills to design, secure, optimize, and develop mobile database systems that address the unique challenges of mobile environments.