1. Introduction to transactional replication
Troy Gallant

2. Troy Gallant
DBA, International software development company, Jacksonville, FL
Previously developer and business analyst
Twitter: “GratefulDBA”
Facebook, LinkedIn

4. What is Replication?
Replication is the process of sharing information between servers to ensure that data is consistent and reliable between systems.

5. Magazine Industry Metaphor
A magazine publisher produces one or more publications
A publication contains articles
The publisher either distributes the magazine directly or uses a distributor
Subscribers receive publications to which they have subscribed

6. Why Replicate? Fault tolerance / Disaster Recovery
Application requirements
Performance gains
Data distribution

7. Fault Tolerance / Disaster Recovery
Local or regional
Solutions
Clustering
Log Shipping
Mirroring
Replication

8. Application Requirements
Some applications require data consolidation
Point of Sale applications (POS)
Sales Force applications (SFA)

9. Performance Gains Offload for reporting
Completely different index structures
Load distribution
1000 users using 1 server or…
100 users using 10 servers?
“Worker nodes” for batch processing

10. Data Distribution Distribute to various environments Staging
Development
Warehouse

12. Alternatives to Replication}
Distributed Transactions over Linked Servers
Triggers
DTS / SSIS
Transaction Level }
Article/Table Level

13. Alternatives to Replication - 2}
Backup/Restore
Log Shipping
SQL Server Mirroring
Clustering
Software Data Mirroring
Hardware Data Mirroring }
Database Level
Server/Disk Array Level

14. Types of SQL Server Replication
Snapshot
Transactional
Merge

15. Snapshot Replication
PUBLISHER
SUBSCRIBER

16. Transactional Replication
PUBLISHER
SUBSCRIBER

17. Merge Replication
PUBLISHER
SUBSCRIBER

18. What can we replicate? Full or subsets of tables Partitioned tables
Stored procedure schema
Views / Indexed Views
UDT’s
Functions
Full-text indexes
Schema objects (triggers, constraints, etc.)
DDL

20. TR Capabilities - SQL Server 2000
Subscriber only
MSDE 2000
Personal
Fully supported
Developer
Standard
Enterprise

21. TR Capabilities - SQL Server 2005
Subscriber only
Express
Express w/ Adv Services
Fully Supported
Workgroup*
Standard
Developer
Enterprise

22. TR Capabilities - SQL Server 2008
Subscriber only
Express Advanced
Express Tools
Express
Web
Fully supported
Workgroup*
Standard
Enterprise

24. Transactional Replication Topology
PUBLISHER
&
DISTRIBUTOR
SUBSCRIBER

25. Transactional Replication Topology
PUBLISHER
DISTRIBUTOR
SUBSCRIBER

26. Transactional Replication Topology
DISTRIBUTOR
SUBSCRIBER
PUBLISHERS

27. Transactional Replication Topology
DISTRIBUTOR
PUBLISHERS
SUBSCRIBERS

28. Transactional Replication Topology
SUBSCRIBER
PUBLISHER & DISTRIBUTOR
PUBLISHER & DISTRIBUTOR

29. Trans. Replication Agents
Snapshot
Log Reader
Distribution

30. Push Subscription
AGENT
DISTRIBUTOR
SUBSCRIBER

31. Pull Subscription
AGENT
DISTRIBUTOR
SUBSCRIBER

32. Implementation Considerations
Define sever roles
What needs to be replicated?
Agents
Agent profile settings
Security
Identity columns
Collation
Triggers / Constraints
TEXT & IMAGE data

33. Physical Implementation
Define/configure the distributor
Define/configure the publications
Define the subscriptions
Push from distributor
Pull from subscriber

34. Monitoring Replication
Replication Monitor
Agents active
Validate throughput
Changing settings
Perfmon
Stored procs
Sp_help_agent_profile
Sp_help_agent_parameter

36. Questions? http://www.troygallant.com Twitter: “GratefulDBA”
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