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4   extreme performance - part ii
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  • Complex event processing involves the processing and querying of data when the data is in flight. The data needs to be processed before there is time to persist it.Such processing involves very high data rates and often deals with multiple concurrent event sources and multiple output data.The aim is to process with as little latency as possible.
  • Slide ObjectiveSQL Server “Denali” AlwaysOn can give you many advantages, including the ability to failover entire applications, easier setup, multiple failover targets, and remote failover.Speaker ScriptSQL Server “Denali” makes high availability and disaster recovery much easier to set up and maintain. With the new availability groups, you can:Have a database and dependent objects fail over as a unit, so you do not have to manually duplicate changes from the master server to the failover servers. This decreases the effort to maintain the system and increases uptime.Provide faster failover for reduced downtime. Failover now is in the order of one minute, down from multiple minutes.Define a failover policy so you can fail to different servers. This lets you reduce the amount of hardware that is sitting idle waiting for a server to fail as well as providing options for local and remote failover.Provide up to four secondary servers. Two are synchronous servers (up-to-date mirroring), with the others being asynchronous (some latency with log shipping).In addition, many operations that used to lock users out of the server now can be performed online, so you do not have to schedule as many maintenance windows.Finally, with support for running SQL Server “Denali” on Windows Server Core, you can reduce the number of operating system patches to increase data availability.

4   extreme performance - part ii 4 extreme performance - part ii Presentation Transcript

  • Scaling out
  • Scalable Shared Databases
  • SQL Server’s greatest challenge
    • We want availability and scalability!
    • The database is a single point of failure
    • The database is the performance bottleneck
    Scale Out
    Scale Up
  • A DBA’s dream
    • Application/website always online
    • Workload is distributed amongst many servers
  • Replication: How does it work?
  • 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
  • P2P - Common scenarios
    Scale out reads and writes
    or…
    Scale out reads, but writes are done to one node only
  • Peer-to-Peer Replication
  • Multisite solution?
  • Back to the DBA’s dream
    Application/website always online
    Workload is distributed
    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!
  • New features in 2008 / R2
    Online topology changes
    Conflict detection
    Partition switch support
    Performance improvements
    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
    Peer-to-Peer Replication is 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
  • Denali HADR
    Denali offers a brand new HADR feature
    High-availability and disaster recovery feature, using up to 4 replicas
    Replicas can be synchronous or asynchronous
    CTP1 supports only single
    asynchronous replica, CTP3 to be released shortly
  • SQL Server “Denali” AlwaysOn
    • Faster failover, easier administration with Availability Groups
    • Identify databases to failover as a unit to reduce unplanned downtime
    • Faster application failover using virtual name
    • Increase application uptime using flexible failover policy
    • Enable better data redundancy and protection with up to four secondaries and up to two synchronous secondaries
    • Limited downtime with enhanced online operations
    • Run Microsoft SQL Server® on Windows Server® Core to reduce planned downtime (50-60% fewer OS patch reboots)
    Shared Storage
    A
    A
    A
    A
    A
    A
    A
    Non-Shared Storage
    A
    A
    Disaster Recovery
  • P2P
    Read-Write
    Up to 10 nodes
    Can replicate portions of the DB
    No automatic failover
    Although can be done through DNS
    2005/2008/R2/2011
    HADR
    Read only
    Up to 4 replicas
    Entire DB only
    Automatic failover
    2011 only
    Peer-to-Peer Vs. HADR
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