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資料遷移的最佳實踐 - Migrating Database to the Cloud 講師: Kim Kao, Solutions Architect, AWS
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Migrating database to cloud
1.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved.© 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Migration Database to the Cloud Kim Kao, Solutions Architect
2.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Today OBJECTIVES • Understand what makes a successful DB migration project • WHY do we migrate • WHAT should we migrate • HOW do we migrate? Project view • HOW do we migrate? Engineering view • Understand the concrete steps to initiate the migration
3.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. How does a successful migration project looks like?
4.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. CHECKLIST #ONE GOALS AND OBJECTIVES
5.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Aurora differentiation Provision a database in 6 minutes Provision a MAZ database with a few mouse clicks MAZ RPO = 0, RTO = 60-90 20-30 sec Scale, patches with 60-90 sec near zero downtime Performance, single node 25k 200k Write, 300k 600k Read Add read replicas with a few mouse clicks Read replica auto-scaling, serverless, multi master (coming) Protect your backups and logs with 11 9’s of durability Recover to any point in time from nightly backups + logs (5mins) Detailed metrics, down to 1 second intervals Secure your data with single click encryption at rest Aurora
6.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. AWS Databases and Analytics Broad and deep portfolio, purpose-built for builders Data Lake S3/Glacier AWS Glue (ETL & Data Catalog) Data Movement Database Migration Service | Snowball | Snowmobile | Kinesis Data Firehose | Kinesis Data Streams Non-Relational Databases DynamoDB ElastiCache (Redis, Memcached) Neptune (Graph) Analytics DW | Big Data Processing | Interactive Redshift EMR Athena Kinesis Analytics Elasticsearch Service Real-time Relational Databases RDS Aurora Business Intelligence & Machine Learning QuickSight SageMaker Comprehend
7.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Migration Strategies for a 100 applications “How can we start the migration? ”
8.
© 2017, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. ISV solution? Yes Support Open Source DB? No Vendor support engine Yes RDS, Aurora, compatible option No New build system? No Biz gain > Re-architecture effort ? No Re-platform to RDS, PIOPS, Multi-AZ, Rehost Yes Re-architecture Yes Read/Write/Acces s pattern How do you query the data Read/Write RPS Data volume growth/total Latency requirement
9.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Comparing Cloud Migration Strategies • Time Cost Business Value # App Retain N/A 20 Retire N/A 5 Re-host 20 Re-platform 20 Re-purchase 5 Re-architect 30 Low High MigrationComplexity
10.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Pilot Migration heat map Easy to migrate High business value Low business value Hard to migrate
11.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. CHECKLIST #TWO CHALLENGES AND CONCERNS
12.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Understanding Database Migration Projects
13.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. It’s Not Just the Database! Application code Scripts and integration points Backup and recovery General management procedures • Monitoring • Notifications • Auditing • Tuning and Diagnostics People!
14.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Project Planning Project Assessment Database Assessment Application Assessment Skill Sets Required Hiring and Developing Talent Choosing the right POCs Project Execution
15.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Migration Effort
16.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Database migration • Like to like (MSSQL to MSSQL) • Rehost • EC2 • Re-platform • RDS, Elasticache • Re-architect • Cache layer, Fan out, Consolidate • Switch engine (MSSQL to PostgreSQL) • Re-architect • Cloud Database • More code rewrite
17.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Like to like Rehost, Re-platform
18.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Migration options If you’re not switching engines, native tools: • SQL Server: bak file import, log shipping, AG Async • MySQL: mysql_dump, read replicas • Oracle SQL Developer, Data Pump, Export/Import • PostgreSQL: pg_dump, read replicas • SAP ASE: bcp • Or AWS DMS
19.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Database migration – multi phase process Phase Description Automation Effort (%) 1 Assessment 4 2 Integration with 3rd party applications 6 3 Data Migration Native tools or DMS 7 4 Functional testing of the entire system 54 5 Performance tuning 4 6 Integration and deployment 13 7 Training and knowledge 3.5 8 Documentation and version control 3.5 9 Post production support 5
20.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Switch engine Re-architecture
21.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Database migration process Source Oracle Database on premises in EC2 or RDS Source Oracle Database on premises in EC2 or RDS AWS Schema Conversion Tool Target Amazon Aurora PostgreSQL Target Amazon Aurora PostgreSQL Step 1 Step 2 AWS Database Migration Service
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Database migration – multi phase process Phase Description Automation Effort (%) 1 Assessment SCT 2 2 Database Schema Conversion SCT/DMS 14 3 Application Conversion/Remediation SCT 25 4 Scripts Conversion SCT 7 5 Integration with 3rd party applications 3 6 Data Migration DMS 4 7 Functional testing of the entire system 29 8 Performance tuning SCT 2 9 Integration and deployment 7 10 Training and knowledge 2 11 Documentation and version control 2 12 Post production support 3
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Assessment
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Components of the SCT console 1. Source Schema 2. Action items 3. Target Schema 4. Schema element details 5. Edit window
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Database migration assessment Connect SCT to source and target databases Run assessment report Read executive summary Follow detailed instructions
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. SCT – Assessment report
27.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Granularity of the messages in the report
28.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Use SCT to convert the SQL code in your C++, C#, Java
29.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Supported Conversions – OLTP *MySQL means any of Aurora, MySQL, MariaDB Source Engine Target Engine Microsoft SQL Server (version 2008 and later) Amazon Aurora (MySQL or PostgreSQL), Microsoft SQL Server, MySQL, PostgreSQL Oracle (version 10.2 and later) Amazon Aurora (MySQL or PostgreSQL), MySQL, Oracle, PostgreSQL PostgreSQL (version 9.1 and later) Amazon Aurora (MySQL), MySQL, PostgreSQL MySQL (version 5.6 and later) Amazon Aurora (PostgreSQL), MySQL, PostgreSQL
30.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. When to use DMS and SCT? Modernize Modernize your database tier • Commercial to open-source • Commercial to Amazon Aurora Modernize your warehouse • Commercial to Amazon Redshift Amazon Aurora Amazon Redshift Amazon S3 Amazon DynamoDB
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. DMS - Overview
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. • Start your first migration in 10 minutes or less • Keep your apps running during the migration • Replicate within, to or from Amazon EC2 or RDS • Move data to the same or a different database engine AWS Database Migration Service
33.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Customer premises Application users AWS Internet VPN Keep your apps running during the migration ® Start a replication instance ® Connect to source and target databases ® Select tables, schemas, or databases ® Let AWS Database Migration Service (AWS DMS) create tables, load data, and keep them in sync ® Switch applications over to the target at your convenience AWS DMS
34.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Migration Scenarios
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Replication Instance Source Target Multiple Targets Target Target
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Migration Server Source Target Multiple Sources Source Source
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Migration Server Source Target Multiple Sources and Targets Source Source Target
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. You Don’t Have to Take Everything Source L Target Replication Instance
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Homogenous or Heterogeneous Replication Instance SQL Server MySQL Replication Instance Oracle Oracle Replication Instance Oracle Aurora
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Deployment Options Option 1 • Let DMS Create Tables and Primary Keys • Create needed secondary objects after initial Load has completed. Option 2 • Create all objects • Disable the secondary objects • Load using DMS(Do Not Drop) • Re-enable secondary Objects Option 3 • Create only Tables, primary keys, views, and sequences • Load using DMS(Do Not Drop) • Create all secondary Objects
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Replication Instance Source Target Start Full Load
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Source TargetReplication Instance Update While Loading Data Also Capture Changes
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Source Target Replication Instance Update Load Complete - Apply Captured Changes
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Changes Reach Steady State Source Target Replication Instance Update
45.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Source Target Replication Instance Update Shut Down Apps & Apply Remaining Changes
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Flip! Source Target Replication Instance Update
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Load is Table by Table Replication Instance Source Target Creates tables at target database Sets up metadata required at target Populates data from source Each process loads one entire table Can use multiple processes Can be paused • When restarted will continue from where it was stopped • Will reload any tables that were currently in progress
48.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Migration Server Source Target Update t1 t2 t1 t2 Changes are Transactional & Come From Logs
49.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. DMS – Change Data Capture (CDC) “No Touch” design • Reads recovery log of source database • Using the engine’s native change data capture API • No agent required on the source • Changes captured as transactions and applied to target • Activated when load starts • When load completes, changes are applied as soon as possible
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. DMS – Change Data Capture (CDC) Some requirements • Oracle: Supplemental logging required • MySQL: Full image row level bin logging required • SQL Server: Recovery model bulk logged or full • Postgres: wal_level = logical; max_replication_slots >= 1; max_wal_Senders >=1; wal_sender_timeout = 0 • For RDS, simply set rds.logical_replication = 1
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Summary SCT – Schema conversion tool DMS – Database migration service
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© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved.© 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Thank You!
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