Anshuman Mandal Anshuman-02905

Feature	Amazon DMS	Azure DMS
Primary Use	Database migration & CDC replication	Database migration & CDC replication
Supported Targets	Aurora, RDS, Redshift, S3	Azure SQL, PostgreSQL, MySQL, SQL Managed Instance
CDC / Incremental Load	Yes	Yes
Serverless Mode	Yes (DMS Serverless)	Yes (DMS Standard with Azure Migrate Integration)
Monitoring	CloudWatch	Azure Monitor / Azure Portal
Schema Conversion	With AW

| Feature | Amazon DMS | Azure DMS |

| -------------------------- | ------------------------------------ | -------------------------------------------------------- |

| Primary Use | Database migration & CDC replication | Database migration & CDC replication |

| Supported Targets | Aurora, RDS, Redshift, S3 | Azure SQL, PostgreSQL, MySQL, SQL MI |

| CDC / Incremental Load | Yes | Yes |

| Stage | AWS Services | Purpose |

| ------------------ | -------------------------------------- | ------------------------------------------------------ |

| Ingestion | DMS, Kinesis, AppFlow, Transfer Family | Bringing data from on-prem, SaaS, or streaming sources |

| Transformation | Glue, EMR, Kinesis Data Analytics | Cleaning, enriching, and standardizing data |

| Orchestration | Glue Workflows, Step Functions, Lambda | Scheduling, dependency handling, and automation |

Memory Area	Description
User Space	Memory accessible by applications, including heap, stack, and loaded libraries. Each process has its own isolated user space.
Kernel Space	Protected memory used by the operating system for core routines, drivers, and managing processes. Shared among all processes but inaccessible to user applications.

Metric	Description
VSZ (Virtual Memory Size)	Total virtual memory requested by a process, including all mapped libraries, heap, stack, and reserved address space. Can appear very large, even if not all memory is used.
RSS (Resident Set Size)	Actual memory currently residing in RAM for the process. Reflects the real memory footprint that affects system performance.

Field	Purpose
lock	Mutex used for protecting span and memory operations.
free	mTreap of non-scavenged spans, i.e., available memory that hasn’t been returned to the OS.
scav	mTreap of free and scavenged spans, i.e., memory ready to be reused or returned to the OS.
sweepgen	Tracks the current sweep generation for the garbage collector.
sweepdone	Indicates whether all spans in a generation have been swept.
sweepers	Number of active `sweepone` calls running concurrently.

Term	Description
Concurrent	Runs alongside your goroutines without stopping the world for long periods.
Tri-color	Objects are tracked as: • White = unreachable (candidate for GC) • Gray = discovered, still need scanning • Black = reachable, fully scanned
Mark-and-sweep	The GC first marks all live objects (reachable from roots), then sweeps memory used by unreachable objects.

Aspect	mspan	mheap
Scope	Local to P while allocated	Global, shared among all Ps
Allocation	Divided into slots for small objects	Provides spans to mcentral/mcache or allocates large objects directly
Sharing	Moves between Ps via mcentral, never shared while in use	Shared globally across all Ps
Locking	Lock-free while local	Locking required for global access

Type	Size	Allocation Path
Tiny	<16 bytes	mcache (fast path)
Small	16B–32KB	mcache → mspan → mcentral → mheap → OS
Large	>32KB	mheap → OS (direct allocation)

	\| Feature \| Amazon DMS \| Azure DMS \|
	\|----------------------------\|--------------------------------------------------\|----------------------------------------------------------\|
	\| Primary Use \| Database migration & CDC replication \| Database migration & CDC replication \|
	\| Supported Targets \| Aurora, RDS, Redshift, S3 \| Azure SQL, PostgreSQL, MySQL, SQL Managed Instance \|
	\| CDC / Incremental Load \| Yes \| Yes \|
	\| Serverless Mode \| Yes (DMS Serverless) \| Yes (DMS Standard with Azure Migrate Integration) \|
	\| Monitoring \| CloudWatch \| Azure Monitor / Azure Portal \|
	\| Schema Conversion \| With AW