Perfomance

Question 1

What is view caching?

Answer 1

It allows you to cache some pages.

Question 2

What is Page caching?

Answer 2

Page caching store the whole page on your disk.

Question 3

What is Action caching?

Answer 3

Page Caching cannot be used for actions that have before filters - for example, pages that require authentication. This is where Action Caching comes in.

Question 4

What is Fragment caching?

Answer 4

Fragment Caching allows a fragment of view logic to be wrapped in a cache block and served out of the cache store when the next request comes in.

When your application receives its first request to this page,
Rails will write a new cache entry with a unique key. (with update_at timestamp)

Question 5

Where we can store cached data?

Answer 5

1) FileStory
2) MemoryStory
3) MemCacheStore
4) RedisCacheStore

Question 6

What is Counter Cashe?

Answer 6

The counter cache, on the other hand, stores the number of records of each associated object in its own column in
the database (We need to add a new column). This value can be retrieved as often as is needed, without requiring potentially expensive computation to take place.

Question 7

How to disable DB caching for ActiveRecord query request?

Answer 7

Company.all.select(“SQL_NO_CACHE *”)