Storage access patterns in HLD - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a storage access pattern?

A storage access pattern is the typical way data is read from or written to storage systems. It helps design efficient data storage and retrieval.

beginner

Explain the difference between sequential and random access patterns.

Sequential access reads or writes data in order, like reading a book page by page. Random access jumps to any data point directly, like opening a book to any page instantly.

intermediate

What is the benefit of caching in storage access patterns?

Caching stores frequently accessed data temporarily to speed up future reads, reducing delays and load on the main storage.

intermediate

Describe the write-through and write-back caching strategies.

Write-through caching immediately writes data to both cache and storage, ensuring consistency. Write-back caching writes data to cache first and updates storage later, improving speed but risking data loss on failure.

beginner

Why is understanding storage access patterns important in system design?

Knowing access patterns helps choose the right storage type and optimize performance, cost, and scalability by matching data flow with storage behavior.

Which storage access pattern reads data in order from start to end?

A Sequential access

B Random access

C Caching

D Write-back

Sequential access reads data in a continuous, ordered manner.

What does caching primarily improve in storage systems?

A Storage capacity

B Data security

C Data retrieval speed

D Data compression

Caching stores data temporarily to speed up future access.

Which caching strategy writes data to storage immediately to keep consistency?

A Write-through

B Write-back

C Random access

D Sequential access

Write-through caching writes data to both cache and storage immediately.

Random access pattern is best described as:

A Reading data in order

B Writing data only once

C Storing data temporarily

D Jumping directly to any data point

Random access allows direct jumps to any data location.

Why should system designers understand storage access patterns?

A To improve user interface design

B To optimize data flow and storage choice

C To reduce network latency

D To increase power consumption

Understanding access patterns helps optimize storage and performance.

Describe the main types of storage access patterns and their characteristics.

Think about how data is read or written in order or randomly, and how caching affects speed.

Explain how caching strategies impact data consistency and performance in storage systems.

Consider when data is written to storage and how that affects speed and safety.