#LLD-HLD

8. Behavioral Patterns

• Chain of Responsibility Design Pattern
• Command Design Pattern
• Iterator Design Pattern
• Mediator Design Pattern
• Observer Design Pattern
• State Design Pattern
• Strategy Design Pattern
• Template Method Design Pattern
• Visitor Design Pattern

# Topic covered
* UML, Its Benefits
* Types of UML Diagrams
  * Structural UML diagrams
  * Behavioral UML diagrams
  * Interaction Diagrams

# Topic covered
* System Design Introduction
* Client - Server Architecture
* Monolith & Microservices
* gRPC
* Network Protocols
* Proxies

# Topic covered
* Scalability
  * Horizontal, Vertical Scaling
  * Load Balancers
* Caching
* Asynchronism
  * Message/Task Queues
    * Producer consumer model
  * Message Broker
    * Publisher subscribe model

# Topic covered
* Performance
  * Latency, Throughput, Bandwidth, Response Time
* Consistency, Availability, and Partition Tolerance (CAP)
* CAP Theorem
* Failure & Fault Tolerance

# Topic covered
* Memory & Storage Systems
  * RAM, ROM, HDD, SSD
* Databases Types
* Database replication
  * Synchronous replication
  * Asynchronous replication
  * Single-Master Replication
  * Multi-Master Replication
* RAID - Redundant Array of Independent Disks

# Topic covered
* Database partitioning
    * Vertical partitioning (aka Normalisation)
    * Horizontal partitioning (aka Database Sharding)
* Hashing
    * Consistent hashing