A Practical Guide to Migrating from Oracle to MySQL · 2007-04-06 · Encryption Transparent, RC4,...
Transcript of A Practical Guide to Migrating from Oracle to MySQL · 2007-04-06 · Encryption Transparent, RC4,...
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1Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
A Practical Guide to Migrating fromOracle to MySQL
Robin SchumacherDirector of Product Management, MySQL AB
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2Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Agenda
• Quick look at MySQL AB• Relationship between Oracle and MySQL• Non-technical reasons why to migrate to MySQL from Oracle• Technical contrasts between Oracle and MySQL• MySQL engine, security, and datatype migration considerations• Migration path strategy • A brief look at the MySQL Migration Toolkit• Final migration considerations• Resources for jump starting migration efforts
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3Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Overview of MySQL AB• Founded in 1995• Operations in 30 countries• 10 million product installations• 50,000 downloads each day• Over 5 million downloads of 5.0 to date• Dramatically reduces TCO of database management• Bundled by more than 100 SW and HW companies• Sold by partners such as HP, Dell, Novell, Unisys, and
others
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4Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Chosen by Successful, Modern Companies
• Embedded– ”Batteries included” database in
software applications– Network elements
• High Volume Web Sites– Dynamic content– eCommerce– Gaming & entertainment– Scale Out
• Enterprise– Data Warehousing– High-Volume Transactions– Departmental– Intranet/Extranet– Scale Out
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5Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Relationship Between MySQL and Oracle
• Innobase and Oracle valued partners of MySQL• Oracle announced as one of our “Partners of the
Year” at 2006 MySQL User’s Conference.• InnoDB one of MySQL’s Storage Engines• Business as usual
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6Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Why Migrate to MySQL?Cost Savings
Example: 10 server, 2 dual-core CPUs, 3 years support
$770K = 93%$2,596K = 98%Savings with MySQL
$830K$2,656K$60KTotal
$330K$1,056K$60K3-years Maintenance and Support
$500K$1,600K$0License
MS SQL Server Enterprise
Oracle Enterprise
MySQL Network
3 year cost comparison
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7Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Why Migrate to MySQL?High-Performance
New SpecAppServer Benchmarks (May 2006)
31%542.17Oracle 4-core (Best)BEA/HP/Itanium/RedHat
16%615.64Oracle 8-core (Best)BEA/Sun/SPARC/Solaris
-712.87MySQL 4-core (Best)SunJavaAppServer/Sun/Opteron/Solaris
Percent MySQL Better Than Oracle
JOPS(Java Ops Per Second)
Database Server / Configuration
MySQL 4 core beats Oracle 8 core…!
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8Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Why Migrate to MySQL?High-Performance
Last eWeek Database Shoot-Out
MySQL v5 33% better than v4 in TM1 benchmark and up to 20% faster in DBT2 when stored procedures used.
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9Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Why Migrate to MySQL?Strong Feature Set
Highly-Available Clustered Database
Cost-based Optimizer
Backup with Point-in-Time Recovery
Open Source
Terabyte Database Size Capable
Stored Procedures, Triggers, Functions, Cursors, Updateable Views
Replication
Robust datatype support (BLOB’s, varchar, datetime, numerics, etc.)
Advanced Indexing (Clustered, Full-Text, Hash, R-Tree)
Server-Enforced Referential Integrity
Row-Level Locking, MVCC (readers don’t block writers)
ACID Transaction Support
Partitioned Tables/Indexes
Standard Heap Tables and B-Tree Indexes
OracleMySQLFeature
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10Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Why Migrate to MySQL?Strong Feature Set
MySQL does not have all the features of Oracle but…• MySQL isn’t designed to be the most feature rich RBDMS but rather one that…
• Offers 80-90% of the features at 10% the cost of proprietary (90% TCO savings)• Provides very high-performance and rock-solid reliability• Easiest to install, setup, configure, maintain, and use• Easily co-exists with Oracle in the data center
Choose MySQL When it Makes Sense and Oracle When it Makes Sense
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11Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Why Migrate to MySQL?MySQL Network
Certified Software for high reliability and stabilityMySQL Software Update Service offers customized updates and alerts for your specific environmentOnline Knowledge Base provides rapid answers to technical questionsProduction Support around-the-clock support directly from MySQL engineersIntellectual Property Protection with comprehensive indemnificationComing Soon! New Monitoring and Advisor Service offers proactive best practice enforcement, notifications, and advice for optimizing MySQL servers
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12Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Oracle to MySQL Migration Scenarios
• Full application migrations• Partial application migrations (lookup data, web session info, etc.)• Business Intelligence migrations (data warehouse, marts, etc.)• Data archiving migrations (storing historical data, etc.) • Embedded database applications requiring smaller footprint
Web Customer Shopping, Session,
Account Information
New Transaction Data
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13Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Contrasting Oracle and MySQL
• Cost-based• Cost-based• Cost-based Optimizer
• Filegroups• Files
• Tablespaces• Datafiles
• Tablespaces• Table/Index Files• Format files
Data Storage
• TempDB (2005+)• Transaction Logs
• Undo Tablespace (9i+)• Redo Logs• Archive Logs
• InnoDB Undo Space• InnoDB Logs• Falcon Log• Binary Log
Redo/Undo Logs
• Buffer cache• SQL cache • Misc caches (lock,
connection, workspace, etc.)
• Data cache (variants)• Log buffer• Shared Pool• Java Pool • Large Pool• PGA
• MyISAM key caches• InnoDB data cache• InnoDB log cache• Dictionary cache• Falcon caches• Query Cache• User caches
Memory Caches
Microsoft SQL ServerOracleMySQLArea
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14Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Contrasting Oracle and MySQL
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15Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Migration Considerations – What Engine?
HighHighLowHighHighLowMemory cost (relative to other engines)
HighMedHighestHighMedHighBulk insert speed
YesYesYesYesYesYesReplication support
NoNoNoYesNoNoBuilt-in Cluster/High-availability support
NoYesNoNoYesNoForeign Key support
NAMedSmallestMedMedSmallStorage cost (relative to other engines)
NoNoYesNoNoYesCompressed data
NAYesNoYesYesYesIndex caches
NAYesNoYesYesNoData caches
NoYesYesNoYesYesGeospatial support
NoYesNoNoYesNoMVCC snapshot read
TableRowRowRowMVCCTableLocking granularity
NoYesNoYesYesNoTransactions
Yes64TBNoYes110TBNoStorage limits
MemoryInnoDBArchiveNDBFalconMyISAMFeature
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16Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Security and Datatype Considerations
Column (row via view)Column, RowPrivilege Granularity
Handled via loggingAudit subsystemAuditing
AES, DES, MD5 SHA1; 128/256Transparent, RC4, DES, AES, etc.Encryption
YesYesSSL Supported
On RoadmapROLESGroup Management
GRANT, REVOKE. Host consideration
GRANT, REVOKEObject Privileges Handled
Root. SYS, SYSTEM, othersBuilt-in Accounts
MySQLOracleSecurity Item
NoneBFILE
BLOBLONG RAW, BLOB
MEDIUMBLOBRAW
LONGTEXTCLOB, LONG
CHAR, VARCHAR, TEXT
CHAR, VARCHAR(2), NCHAR, NVARCHAR
MySQL DatatypeOracle Datatype
DATETIME,TIMESTAMPDATE, TIMESTAMP
DOUBLEFLOAT
DECIMALREAL, DOUBLE
DECIMAL (P,S)NUMBER (P,S), DECIMAL (P,S)
INT, BIGINT, DECIMALNUMBER, DECIMAL
MySQL DatatypeOracle Datatype
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17Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Miscellaneous Migration Considerations
Objects in Oracle that do not have a complement in MySQL include:
• TYPEs• Synonyms • Materialized Views (coming in upcoming version)• Dimensions• Sequences (MySQL uses AUTOINCREMENT columns)• Bitmap Indexes• Global Partitioned Indexes (coming soon)• Packages (although MySQL does have stored procedures)• Java Stored Procedures• DDL and Statement-Based Triggers (MySQL has Row-Based)
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18Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Migration Strategies
3 4 522
• User accounts • Entities• Relationships• Datatypes• Rules (data, etc.)
• Simple moves • Transformations• Aggregations • Data Profiling /
Cleansing
• ETL Runs• Scheduled/Recurring• Validation• Migrate Code?
• Simulation• Metric Analysis• Review
11
Document Sources
• User Accounts • Entities• Relationships• Datatypes• Rules (data, etc.)
Data Migration Lifecycle
Design Targets
Design ETL Flows
Build/RunMigrations
Performance Test
• Scripts/Manual• Data Models• Models, Reports, etc.
• Scripts/Manual• Data Models• Models, Reports, etc.
• Scripts/Vendor Supplied
• Tactical 3rd Party• Enterprise Global
• Scripts/Manual• Tactical 3rd Party• Enterprise Global
• Manual• Tactical 3rd Party• Automated
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19Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Migration Strategies – Step 1
Document Oracle Sources
1. Manual2. 3rd party Tool3. MySQL Workbench (Beta)
Best Practice – Use Models!
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20Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Migration Strategies – Step 2
Define MySQL Targets
1. Manual2. 3rd party Tool3. MySQL Workbench (Beta) or MySQL Migration Toolkit
Best Practice – Use Models or Migration Toolkit!
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21Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Migration Strategies – Step 3
Design ETL Flows
1. Manual via scripts2. 3rd party Tool3. MySQL Migration Toolkit
Best Practice – Use Third Party Tool or Migration Toolkit!
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22Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Migration Strategies – Step 4
Build and Run Migration Routines
1. Manual via scripts2. 3rd party Tool3. MySQL Migration Toolkit
Best Practice – Use Third Party Tool or Migration Toolkit!
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23Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Migration Strategies – Step 5
Performance Test
1. Manual2. 3rd party Tool3. MySQL mysqlslap utility
Best Practice – Use Third Party Tool or mysqlslap!
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24Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Migration Toolkit – How Does it Work?
1. Connect to and Reverse Engineer Oracle Source2. Connect to MySQL Target3. Select Schemas/Objects to Migrate4. Customize MySQL Target Schemas/Objects5. Transform Oracle Schemas/Objects to MySQL Schemas/Objects6. Move Data from Oracle to MySQL
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25Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Oracle-to-MySQL Object Translation
Schema Migration Toolkit Database
Table Migration Toolkit Table
Index Migration Toolkit Index
View Migration Toolkit View
Stored Procedure manual Stored
Procedure
Function manual Function
Trigger manual Trigger
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26Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Other Oracle->MySQL Migration Considerations
• For large data migrations, ensure all proper MySQL parms are set (Migration Toolkit will do automatically for you).
• Enable sql_mode option in MySQL 5.0 for maximum data integrity • Look into 3rd party management tools to manage both Oracle & MySQL• Ensure to mirror Oracle needs in MySQL (autogrowth datafiles, binary
logging for point-in-time recovery, etc.)• Ensure MySQL memory defaults are not used for demanding systems• Look into MySQL 5.0+ Instance Manager to manage multiple MySQL’s• When tuning migrated SQL code, utilize slow query log to catch bad SQL• Periodically check MySQL error log just like Oracle alert log• Look to MySQL Network for production/data center applications
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27Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Conclusion
Does it make sense to migrate from Oracle to MySQL?
• Financial? Yes! 10-20% of the cost of Oracle. • Reliability? Yes! MySQL maintains the highest levels of uptime at many
enterprise installations.• Performance? Yes! MySQL has proven track record against Oracle.• Ease of Use? Yes! MySQL is much easier to install, setup, and administer.• Safety? Yes! MySQL Network provides certified software, around-the-
clock support, and much more to provide data center-level confidence.
Choose MySQL When it Makes Sense and Oracle When it Makes Sense
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28Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
Resources
• Professional Services 5-day “Migration Jumpstart”– www.mysql.com/migration
• MySQL Migration Toolkit– http://www.mysql.com/products/tools/migration-toolkit/
• MySQL Migration Central– http://www.mysql.com/why-mysql/migration/
• MySQL Migration Forums– http://fourms.mysql.com
• MySQL Case Studies– http://www.mysql.com/it-resources/case-studies/
• MySQL Whitepapers– http://www.mysql.com/why-mysql/white-papers/
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29Copyright 2006 MySQL AB The World’s Most Popular Open Source Database
A Practical Guide toMigrating from
Oracle to MySQL
Thank You!