Learning Objectives: - Understand Amazon RDS for SQL Server capabilities - Review various migration methods for SQL server into AWS - Learn how to configure AWS DMS and SCT in migrating databases to AWS

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Arun Thiagarajan – DMS Database Engineer
7th December 2017
Migrating your SQL Server
database to AWS using DMS

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Agenda

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What to expect from this session
1. Know about different ways to migrate a SQL Server
database to AWS
2. Know how to use DMS to migrate a SQL Server
database to AWS
3. Know the internals of how DMS migrates a SQL Server
database
4. Advantages of DMS in database migrations
5. Demo

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Ways to migrate your SQL Server database

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Ways to migrate
1. Backup and restore
2. SQL Server Replication or use AlwaysOn availability
group
3. Use AWS DMS to bulk load data and replicate on-going
changes

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Database Migration Service

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Database Migration Process
Step 1: Convert or Copy your Schema
Source DB or DW
AWS SCT
Native Tool
Destination DB or DW
Step 2: Move your data
Source DB or DW
AWS SCT
Destination DB or DW
AWS DMS

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How does DMS work?
Customer
premises
Application users
AWS
Internet
VPN
Start a replication instance
Connect to source and target
databases
Create Tasks
 Let AWS DMS create tables,
load data, and keep them in
sync
 Switch applications over to
the target at your convenience
AWS
DMS

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DMS Multi-AZ
Customer
premises
or AWS
AWS
Internet
VPN
AWS DMS
AWS DMS

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DMS – SQL Server as a source

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The process
1. Enable replication for DB using sp_replicationdboption
2. Create a publication artefact with a 1=0 filter for the
database.
Note – this is done to make sure all required statements
are logged into the transaction log
3. Use fn_dblog() and fn_dump_dblog() functions to read
changes from transaction log according to the LSN

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DMS - SQL Server as a source
Start table full load (BCP by default). Also enable
publication on table with 1=0 filter for extra logging
Collect cached changes from transaction log using
fn_dblog() and fn_dump_dblog() during table full load
Once cached changes are applied, use same functions
to read changes according to LSN and apply on target
Use awsdms_truncation_safeguard table (by default) to
maintain transaction read from active transaction log

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Database Migration Service - Advantages

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Why use DMS and SCT?
Secure
Cost Effective
Remove Barriers
to Entry
Allow DB
Freedom
Keep a Leg in
the Cloud
Easy to Use, but
Sophisticated…
Near-Zero
Downtime

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Advantages
Modernize Migrate Replicate
Modernize your database tier –
• Commercial to open-source
• Commercial to Amazon Aurora
Modernize your Data Warehouse –
• Commercial to Redshift
• Migrate business-critical
applications
• Migrate from Classic to VPC
• Migrate data warehouse to
Redshift
• Create cross-regions Read Replicas
• Run your analytics in the cloud
• Keep your dev/test and production
environment sync

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Demo

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Thank you!