Migrate Oracle database to Amazon RDS
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This document discusses migrating an Oracle database to Amazon RDS. It outlines that DBaaS like RDS reduces management costs but also has less flexibility than self-managed EC2 databases. The document then describes a process for migrating an Oracle database to RDS using Oracle Data Pump utilities to export the database, transfer the export file to RDS using DBMS_FILE_TRANSFER, and import the file into a new database on RDS. This process leverages an EC2 instance as a pivot to help mitigate issues with directly uploading large export files to RDS.
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Migrate Oracle database to Amazon RDS
- 1. Amazon RDS Migrate Oracle Database to Guatemala, September 2017
- 2. Why migrate to DBaaS? Cost Database management is expensive. Moving to DBaaS reduces management cost, moving to open source engines can reduce costs by 90% or more. Risks Proprietary databases are risky. Availability, scalability, malwares.
- 3. Where do DBAs spend their time?
- 7. Amazon Relational Database Service (RDS) • Database as a Service • Fully managed database service • Automated hardware provisioning, patching, backup/restore, scaling • High availability with RDS Multi-AZ, Auto- Failover 99.95% SLA for Multi-AZ deployments • Database monitoring and alerts • Security
- 9. The Dilemma (RDS vs. EC2) • RDS vs. EC2 • Didn’t like the idea of RDS • Too restrictive/loss of control • No direct access to the box • “It’s doing my job” • DBAs conducted a full review with an open mind
- 10. The Dilemma (RDS vs. EC2) EC2 • Pros Flexibility w/ full access Access to the Oracle utilities (Dataguard, RMAN, etc.) Similar to the way it’s managed today • Cons Self-deployed High administrative overhead (all tasks manual - self installation, patching, backups, etc.) RDS • Pros Managed Service = reduced overhead (easy deployment, automated patching and backups, etc.) Multi-AZ option for HA Parameter and Option groups Flexible license model with BYOL option • Cons Don’t have access to all the Oracle utilities
- 11. Migrate Oracle Database to Amazon RDS
- 12. Options to Migrate to RDS • Oracle SQL Developer Small Databases • Oracle Data Pump Move large Databases • Oracle Export/Import Utilities • Oracle SQL*Loader • Oracle Golden Gate • Migration and replication • RMAN ? Dataguard Not possible • Amazon Data Migration Services (DMS)
- 13. Migration Time using Oracle Data Pump Export Upload to RDS Import Switch Applications • How much downtime is acceptable? • Depending on the size of the database, the time increases • Sometimes upload the export file is a problem • You can use an EC2 instance to mitigate the problem Create a Standby Database on EC2 Reduce problems to upload export file
- 14. … Using a EC2 pivot instance • Standby Database on EC2 • Replication in real time • Upload Export file from AWS Network • Reduce time to upload export file
- 15. Migrate Process … Step 1: Grant privileges to user on source database Step 2: Stop all database transactions Step 3: Check Dataguard synchronization Step 4: Open Standby Database Step 5: Use Export Data Pump or DBMS_DATAPUMP to create a dump file from Database on EC2 $ expdp user1 DUMPFILE=tab1.dmp DIRECTORY=DATA_PUMP_DIR full=y
- 16. Step 6: Create a database link to the target DB instance (RDS) from the Database on EC2 Migrate Process … SQL> create database link to_rds connect to USER2 identified by user2pwd using '(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=<dns or ip address of remote db>)(PORT=<listener port>))(CONNECT_DATA=(SID=<remoteSID>)))';
- 17. Migrate Process … Step 7: Use DBMS_FILE_TRANSFER to copy the exported dump file to the Amazon RDS instance from the Database on EC2. SQL> BEGIN DBMS_FILE_TRANSFER.PUT_FILE( source_directory_object => 'DATA_PUMP_DIR', source_file_name => 'tab1.dmp', destination_directory_object => 'DATA_PUMP_DIR', destination_file_name => 'tab1_copied.dmp', destination_database => 'to_rds' ); END; /
- 18. Step 8: Import the dump file into a database on the Amazon RDS instance from the Database on EC2. Migrate Process … $ impdp rds_user@to_rds DUMPFILE=tab1_copied.dmp DIRECTORY=DATA_PUMP_DIR full=y EXCLUDE=SCHEMA:"IN ('ORDSYS', 'ORDPLUGINS','SI_INFORMTN_SCHEMA','ORDDATA','MDSYS')"
- 19. Step 9: Clean up dump file from RDS instance. Migrate Process … SQL> select * from table(RDSADMIN.RDS_FILE_UTIL.LISTDIR('DATA_PUMP_DIR')) order by mtime; SQL> exec utl_file.fremove('DATA_PUMP_DIR','tab1_copied.dmp');
- 20. Thank you! Jesús Guzmán Blog: https://susguzman.wordpress.com/ Email: [email protected], [email protected] http://www.datum.com.gt/
Editor's Notes
- #5: https://www.linkedin.com/pulse/iaas-paas-saas-explained-compared-arsalan-eizadirad
- #6: https://endjincdn.blob.core.windows.net/assets/endjin-cloud-platform-comparison.pdf https://www.rightscale.com/blog/cloud-industry-insights/cloud-computing-trends-2017-state-cloud-survey http://www.zdnet.com/article/oracle-preps-autonomous-database-at-openworld-aims-to-cut-labor-admin-time/
- #9: https://www.edureka.co/blog/rds-aws-tutorial/
- #10: https://www.slideshare.net/AmazonWebServices/ent305-migrating-your-databases-to-aws-deep-dive-on-amazon-relational-database-service?qid=78ab2360-23ad-42d7-aa4a-dd0011891402&v=&b=&from_search=5
- #11: https://www.slideshare.net/AmazonWebServices/ent305-migrating-your-databases-to-aws-deep-dive-on-amazon-relational-database-service?qid=78ab2360-23ad-42d7-aa4a-dd0011891402&v=&b=&from_search=5
- #13: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Oracle.Procedural.Importing.html
- #16: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Oracle.Procedural.Importing.html
- #19: Also you can use DBMS_DATAPUMP