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Sqlpass   The Magic Of Replication
 

Sqlpass The Magic Of Replication

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    Sqlpass   The Magic Of Replication Sqlpass The Magic Of Replication Presentation Transcript

    • The Magic of Replication
      What’s new in SQL Server 2008 Replication?
    • Who Am I?
      Meir Dudai
      SQL Server consultant – Valinor (SQL Server Consulting Services)
      Working with SQL Server for 10 years
      Specialize in Replication, my favorite feature in SQL Server
      Operating SQL Server Israeli website: http://www.SQLServer.co.il/
      meir@valinor.co.il
    • Agenda
      SQL Server’s greatest challenge
      Replication overview
      Peer-to-Peer Replication
      Replication enhancements – SQL Server 2008
    • SQL Server’s greatest challenge
    • SQL Server’s greatest challenge
      We want availability and scalability!
      The database is a single point of failure
      The database sometimes is the performance bottleneck
      Scale Out
      Scale Up
    • Scale Up vs. Scale Out
    • A DBA’s dream
      Application/website always online
      Workload is distributed amongst many servers
    • Scalability and Availability Options in SQL Server
    • Scalability and Availability Options in SQL Server
    • Agenda
      SQL Server’s greatest challenge
      Replication overview
      Peer-to-Peer Replication
      Replication enhancements – SQL Server 2008
    • What is Replication?
      “Make copies of digital material for backup, performance, reliability, or preservation”
      (Digital Libraries, by William Arms)
      “The use of redundant resources to improve reliability, fault-tolerance, or performance “ (Wikipedia)
    • How does it work?
    • Agenda
      SQL Server’s greatest challenge
      Replication overview
      Peer-to-Peer Replication
      Replication enhancements – SQL Server 2008
    • Introduction to Peer-to-Peer Replication
      Databases replicate reciprocally and are writable
      Redundancy provides fault tolerance and lowers maintenance downtime
      Online upgrades possible
    • Peer-to-Peer Topology
      Logreader
      Agent
      Logreader
      Agent
      Logreader
      Agent
      Dist
      DB
      Dist
      DB
      Dist
      DB
      Distribution
      Agent
      Distribution
      Agent
      Distribution
      Agent
      Los Angeles
      London
      Transactional
      Replication
      Taipei
    • Peer-to-Peer– common scenarios
      Scale out reads and writes
      or…
      Scale out reads, but writes are done to one node only
    • Peer-to-Peer – Multisite solution?
    • Back to the DBA’s dream:
      Peer-to-Peer Replication!
      • Application/website always online
      • Workload is distributed amongst many servers
      Implementing
      Peer-to-Peer
    • Challenges
      Design your schema and topology properly to prevent conflicts
      P2P is an asynchronous solution and does not guarantee zero data loss or zero latency
      Not completely transparent
      Although transparent enough!
    • Agenda
      SQL Server’s greatest challenge
      Replication overview
      Peer-to-Peer Replication
      Replication enhancements in
      SQL Server 2008
    • Changing replication topology online
      In SQL Server 2005, replication had to be stopped (quiesced) in order to perform some actions:
      Add nodes
      Schema changes
      In SQL Server 2008, these actions can be done online
      And you also get a cool wizard in SSMS…
    • Configure Peer-to-Peer Topology Wizard
      Demo
    • Conflict Detection and Resolution
      SQL Server 2008 introduces conflict detection capability in peer-to-peer replication
      All types of conflicts are detected and reported though agent error reporting or conflict tables
      Two options on detecting conflict
      Fail replication stream
      Continue stream after logging conflict
      Update tbl_user set
      Name =‘camern’
      Update tbl_user set
      Name =‘cameron’
    • Conflict Detection and Resolution
      Conflicts are resolved based on originator_id value – higher wins
      Manual resolution of conflicts is required in most cases
      Best approach: Prevent conflicts through write partitioning even with conflict detection capabilities available
      Update tbl_user set
      Name =‘camern’
      Update tbl_user set
      Name =‘cameron’
    • Enabling Conflict Detection
      Enable conflict detection in publication properties
      Set a value for the originator ID
      Specify action in case of conflict:
      Stop and alert (default)
      Continue (may cause data inconsistency)
    • Viewing conflicts
      When a conflict occurs, replication will stop by default
      You can view the conflict using Conflict Viewer in SSMS and address it manually
    • Conflict Detection and Resolution
      Demo
    • Replicating partition switch
      In SQL Server 2005, switch partition action was unsupported in replicated environment
      This was a major consideration for organizations when deciding whether to use replication or not
      In SQL Server 2008, you can switch partition on a replicated table, and replicate this action
      Requires some settings in publication properties
    • Replicating partition switch
      Publication properties:
      @allow_partition_switch: allows SWITCH PARTITION to be executed against the publication database
      @replicate_partition_switch: determines whether the SWITCH PARTITION DDL statement should be replicated to Subscribers
      Preparations:
      Make sure that all tables that are involved in partition switching exist at the Publisher and Subscriber
      Make sure that the table and partition definitions are the same
      Switch partition using ALTER TABLE command
    • Performance improvements
      Under Windows Server 2008, replication works faster than ever:
      Snapshot delivery of more than 500MB/minute
      One of the interesting benchmarks for a pull subscriber, time to deliver 100,000 varbinary (max) records:
      Win2003/SQL2005 – 223 minutes
      Win2008/SQL2008 – less than 2 minutes!
    • Conclusion
      Peer-to-Peer Replication can provide one of the best methods for systems scale out
      Dramatically increase performance
      Eliminate downtime
      SQL Server 2008 provides major improvements for Peer-to-Peer Replication, and makes it accessible and more robust
    • Related sessions
      Building a High Availability Strategy for your Enterprise
      Gopal Ashok
      Wednesday, 10:15AM
      Transactional Replication: Beyond The Basics
      Kendal Van Dyke
      Thursday, 4:00PM
    • Q&A
    • Complete the Evaluation Form & Win!
      You could win a Dell Mini Netbook– every day – just for handing in your completed form! Each session form is another chance to win!
      Pick up your Evaluation Form:
      Within each presentation room
      At the PASS Booth near registration area
      Drop off your completed Form:
      Near the exit of each presentation room
      At the PASS Booth near registration area
      Sponsored by Dell
    • Thank you
      for attending this session and the 2009 PASS Summit in Seattle