Exadata Implementation Strategy

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  • Exadata Implementation Strategy


  • Who Am I Oracle Certified Administrator from Oracle 7 12c

    Exadata Certified Implementation Specialist since 2011

    Oracle Database Performance Tuning Certified Expert

    Oracle Business Intelligence Foundation Suite 11g Certified Implementation Specialist

    Oracle Database Data Warehousing Certified Implementation Specialist

    Multiple Exadata Implementations / POCs for large financial organizations

    Migrate / Upgrade databases between various versions of Oracle

    Capacity Planning for Oracle Engineered Systems

    Database Consolidation to Exadata / 12c Platform

    Architect Databases for OLTP and OLAP applications

    Not an Oracle Employee or Nor I represent Oracle in any way

    Umair MansoobExadata Implementation Strategy

  • Overview

    Plan CutoverOptimizeMigrate Test

    Umair MansoobExadata Implementation Strategy

  • Plan

    Umair MansoobExadata Implementation Strategy

    Analyze Current Architecture

    Deployment Decisions

    Migration Considerations

    HA Architecture

    Testing Strategy

  • Analyze Current Architecture

    Analyze source database characteristic like database size and parameter settings.

    Analyze source host system characteristics like memory foot and IO through put and resource utilization.

    Is there a compliance requirement to encrypt data on rest ?

    Gather baseline from existing application system to compare result later.

    Gather AWR, ASH and other statistics from current environment

    Umair MansoobExadata Implementation Strategy

  • Deployment Decisions

    Do you need to virtualized Exadata machine to Isolate targetdatabase.

    What type of redundancy level you need ( High or Normal ) ,External is not supported

    Do you need to implement resource management using DBRM orIORM

    Do you need to isolate network or partition InfiniBand network forcompliance reason.

    Umair MansoobExadata Implementation Strategy

  • Migration Considerations How much time you have to cutover the application

    Will you be needing Golden Gate to replicate database formigration.

    Do you have access to Database backups from Exadata Machine

    How is network bandwidth between source and target ExadataSystem

    Inform business user and other stake holders about upcomingmigration, so they can plan for outage

    What is Recovery Time Objective (RTO)

    Umair MansoobExadata Implementation Strategy

  • High Availability Architecture

    What will be your backup strategy , Tape or Exadata Storage

    Depending on the database size , backing it up on Exadata storagecan be very expensive

    Will Data Guard going to be part of your DR strategy

    Can you offload backups or reporting services to DR site

    How are you planning to use services to manage

    How enable flashback database impact application performance

    Umair MansoobExadata Implementation Strategy

  • Testing Strategy

    How are you planning to test your application on Exadata ?

    Do you need to develop additional test plans ?

    Will you be introducing code or architecture changes during the migration

    How are you planning to capture statistic during testing ?

    Umair MansoobExadata Implementation Strategy

  • Migrate

    Umair MansoobExadata Implementation Strategy


    Data Guard

    Transportable TbsPhysical

    Data Pump

    Insert as Select

    Golden GateLogical

    Source Exadata

  • MigrateEach migration method has its own pros and cons, so analyze themcarefully based on your requirements

    Data migration methods can be categorized as physical migration orlogical migration.

    You should run exachk utility to review and implement Exadata bestpractices.

    Physical migration is a block by block copy of data, popular methodsare data guard and RMAN.

    Popular logical methods are data pump or insert as select.

    Umair MansoobExadata Implementation Strategy

  • Physical Migration Pro : Migrating data using physical methods can be very simple andstraight forward.

    Pro : Support cross platform Migrations using RMAN transportabledatabase.

    Con : Bring all the characteristics of target database, which mightnot be optimal.

    Con : Will require extra effort to implement Exadata best practicesand enable features like compression.

    Umair MansoobExadata Implementation Strategy

  • Logical Migration Pro : Exadata best practices will already be in place , if database wascreated using DBCA utility.

    Pro : Can POC Exadata specific feature like compression and storageindexes

    Con : Not simple , will require extra effort and time to bring dataover to Exadata machine

    Con : Since its not a block by block copy , execution plans canchange.

    Umair MansoobExadata Implementation Strategy

  • Optimize

    Umair MansoobExadata Implementation Strategy


    Smart Scan



  • Optimize

    You should look into testing following Exadata Features during yourPOC.

    Compression not only reduces your storage footprint but alsoimprove performance.

    Even though offloading and smart scan are enabled by default butmake sure they are turned on and performing as expected.

    Test Storage indexes by making but selected non primary keyindexes invisible.

    Umair MansoobExadata Implementation Strategy

  • Compression

    Regardless of Exadata, Oracle has two native compression types,basic table compression and OLTP Compression

    You can get reasonable compression ratio with OLTP compressionand it will also support DML operations.

    Please note that there will be some overhead and you will needadvance compression license to use OLTP compression.

    You can get extremely good compression ratio with HybridColumnar compression but OLTP operations are not supported

    Umair MansoobExadata Implementation Strategy

  • Smart Flash Cache

    Exadata smart flash cache has an ability to move data in and outfrom cache based on usage.

    It is enabled by default, you dont have to configure anything toenable it.

    If enable , Write back flash cache provides the ability to write I/Osdirectly to PCI flash

    Write-back cache can help reduce "free buffer waits" waits forwrite intensive applications.

    Umair MansoobExadata Implementation Strategy

  • Offloading / Smart ScanExadata extreme performance is archive through offloading andsmart scan.

    Offloading means some of Oracle processes are offloaded toExadata Storage node.

    Oracle processes that can be offloaded to storage nodes areincremental backups, Data File creation, decompression anddecryption

    There are some pre-requisites for smart scan like direct path readand full table scan.

    Umair MansoobExadata Implementation Strategy

  • Storage Indexes

    Storage indexes are memory structure at storage level.

    Storage Indexes reduce Disk I/O by maintaining an entry forminimum and maximum value for data per 1 MB by default.

    You can drop most non-primary key indexes and force queries to useStorage indexes.

    Usually BITMAP indexes are ideal candidates for offloading queriesto Storage Indexes.

    Umair MansoobExadata Implementation Strategy

  • Partitioning

    Partitioning Strategies Interval - Range , List , Hash , Composite, etc

    Partitioning pruning is the simplest and also the most substantialmeans to improve performance.

    Partitioning can also improve the performance of multi-table joins,by using a technique known as partition-wise joins.

    Partitioned database objects provide partition independence , animportant part of a high-availability strategy.

    Umair MansoobExadata Implementation Strategy

  • ParallelismYou can execute your queries in parallel to speed up your load

    You can enable parallel query execution at object level or you canuse SQL hint

    AUTO DOP will automatically parallelize your queries based on athreshold

    The default of parallel_min_time_threshold parameter is 10seconds

    Umair MansoobExadata Implementation Strategy

  • Resource Management

    Database Consolidation might require some level of resourcemanagement

    Resource mgmt will help you consistent performance acrossdifferent workload and databases

    You can use Oracle native resource management tool called DBRMto manage CPU utilization, parallel queueing and long running queries

    You can use IORM Exadata native utility to manage I/O throughputand latency.

    Umair MansoobExadata Implementation Strategy

  • Test

    Umair MansoobExadata Implementation Strategy

    Start Testing

    Testing Considerations

    Capture Statistics

  • Start Testing

    Testing should include should include all the variation you want totest during your POC.

    You can a test like for like, which means you are not planning tomake any changes to your database architecture like compression,partition or encryption

    There are different type of tests you can run during your POC, likePerformance test, load test, break test.

    Dont forget to capture statistics during test phase of POC.

    Umair MansoobExadata Implementation Strategy

  • Testing Considerations

    Remember you are moving your application to new hardware

    You might be changing underline hardware system for your database

    You might be moving from NON-RAC to RAC database system

    Performance testing provides most important statistics for your POC

    Some customer like to perform failover and break