session in asp.net core in memory

Question

As I know in ASP.NET Core we can store a session in memory, in sql server or in redis.

On that website: http://jiodev.com/aspnet/core/performance/caching/distributed I have found the article:

A distributed cache is shared by multiple app servers (see Caching Basics). >The information in the cache is not stored in the memory of individual web >servers, and the cached data is available to all of the app's servers.

As I understand I can use in memory distributed cache even if I have my application on multiple servers and I can share session? If yes then when to store session in sql server or redis?

When you actually get around to implementing it you should go with redis :) SQLServer is not a true memory cache. — Avin Kavish
– Avin Kavish, Commented Jun 13, 2019 at 19:16

Charlie Drewitt · Accepted Answer · 2019-06-13 19:09:06Z

2

An in-memory distributed cache is an oxymoron, unless you provide some way for the other servers in the cluster to connect to it and retrieve the cached data.

In your case, I think you could apply the simple rule:

1 Server = In Memory
>1 Server = SQL Server or Redis (i.e. distributed).

If you re-read that article, I think you'll find that the two implementations of IDistributedCache talked about are SQL Server and Redis. There is no in-memory implementation of IDistributedCache and if there was, it would only be suitable for testing purposes.

Edit: As pointed out by ESG below, there is actually an in-memory implementation of IDistributedCache, but it is not actually a distributed cache, and as I stated above, is only useful for testing/development scenarios or where a distributed cache might be required in future.

edited Jun 13, 2019 at 19:09

answered Jun 13, 2019 at 19:08

Charlie Drewitt

1,5932 gold badges10 silver badges14 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

ESG Over a year ago

as per the doc: The Distributed Memory Cache isn't an actual distributed cache. Cached items are stored by the app instance on the server where the app is running.

Bilal Ahmed Over a year ago

so how we can share sessions among same app hosted on multiple servers in load balanced scenario?

Christian Vorhemus Over a year ago

In-memory caches can still be useful in production multi-server scenarios when you can ensure session-affinity.

Collectives™ on Stack Overflow

session in asp.net core in memory

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related