There are four major components of SQL memory architecture…

1. Memory Broker
2. Memory Object
3. Memory Clerk
4. Memory Node

In short, BOCN. (For remember it “Boy Of Cartoon-Network”)

1. Memory Broker

Purpose of Memory Broker is to provide a centralized mechanism to distribute/control memory the allocation made by each component in SQL Server.

Note: Memory brokers do not perform any allocations.

Below are the types of Memory Broker…

A. MB for Cache
B. MB for Steal
C. MB for Reserve
D. MEMORYBROKER_FOR_COMMITTED
E. MEMORYBROKER_FOR_XTP

2. Memory Object

MO are memory allocations made through the clerks.

There are 3 types of MO
A. Variable MO
B. Shrink MO
C. Fixed Size MO

3. Memory Clerks

MC is the actual memory consumer of memory. 

There are 4 types

A. Generic MC
B. Cache Store MC
C. Object Store MC
D. User Store MC

4. Memory Node

It’s a large memory pool from where different companies can allocate memory. 

Number of MN depends on NUMA.
In MN, 4 types of allocation can be done…

A. Single page allocation
B. Multi page allocation

C. Large page allocation
D. Reserved page allocation