Migrating Databases to the Cloud
You can migrate your on-premises Oracle Database to an Oracle Cloud Infrastructure Database service database using a number of different methods that use several different tools. The method that applies to a given migration scenario depends on several factors, including the version, character set, and platform endian format of the source and target databases.
Oracle now offers two new solutions for migrating Oracle database workloads from on-premises and Oracle Cloud Infrastructure Classic to a variety of Oracle Database Cloud services: Oracle Cloud Infrastructure Database Migration Service and Zero Downtime Migration.
Zero Downtime Migration (ZDM) is an installable tool which provides you with a simplified and automated migration experience, providing zero to negligible downtime for the production system.
OCI Database Migration Service is based on the ZDM tool, and as a managed OCI service it provides you with a user interface to move Oracle databases to Oracle Cloud.
For more information, see the following topics:
Choosing a Migration Method
Not all migration methods apply to all migration scenarios. Many of the migration methods apply only if specific characteristics of the source and destination databases match or are compatible. Moreover, additional factors can affect which method you choose for your migration from among the methods that are technically applicable to your migration scenario.
Some of the characteristics and factors to consider when choosing a migration method are:
- On-premises database version
- Database service database version
- On-premises host operating system and version
- On-premises database character set
- Quantity of data, including indexes
- Data types used in the on-premises database
- Storage for data staging
- Acceptable length of system outage
- Network bandwidth
To determine which migration methods are applicable to your migration scenario, gather the following information.
Database version of your on-premises database:
- Oracle Database 12c Release 2 version 188.8.131.52
- Oracle Database 12c Release 1 version 184.108.40.206 or higher
- Oracle Database 12c Release 1 version lower than 220.127.116.11
- Oracle Database 11g Release 2 version 18.104.22.168 or higher
- Oracle Database 11g Release 2 version lower than 22.214.171.124
For on-premises Oracle Database 12c Release 2 and Oracle Database 12c Release 1 databases, the architecture of the database:
- Multitenant container database (CDB)
Endian format (byte ordering) of your on-premises database’s host platform
Some platforms are little endian and others are big endian. Query V$TRANSPORTABLE_PLATFORM to identify the endian format, and to determine whether cross-platform tablespace transport is supported.
The Oracle Cloud Infrastructure Database uses the Linux platform, which is little endian.
Database character set of your on-premises database and the Oracle Cloud Infrastructure Database database.
Some migration methods require that the source and target databases use compatible database character sets.
Database version of the Oracle Cloud Infrastructure Database database you are migrating to:
- Oracle Database 12c Release 2
- Oracle Database 12c Release 1
- Oracle Database 11g Release 2
Oracle Database 12c Release 2 and Oracle Database 12c Release 1 databases created on the Database service use CDB architecture. Databases created using the Enterprise Edition software edition are single-tenant, and databases created using the High Performance or Extreme Performance software editions are multitenant.
After gathering this information, use the “source” and “destination” database versions as your guide to see which migration methods apply to your migration scenario:
Migration Connectivity Options
You have several connectivity options when migrating your on-premises databases to the Oracle Cloud Infrastructure. The options are listed below in order of preference.
- FastConnect: Provides a secure connection between your existing network and your virtual cloud network (VCN) over a private physical network instead of the internet. For more information, see FastConnect.
- Site-to-Site VPN: Provides a secure connection between a dynamic routing gateway (DRG) and customer-premise equipment (CPE), consisting of multiple IPSec tunnels. The IPSec connection is one of the components forming a Site-to-Site VPN between a VCN and your on-premises network. For more information, see Site-to-Site VPN.
- Internet gateway: Provides a path for network traffic between your VCN and the internet. For more information, see Internet Gateway.
Many methods exist to migrate Oracle databases to the Oracle Cloud Infrastructure Database service. Which of these methods apply to a given migration scenario depends on several factors, including the version, character set, and platform endian format of the source and target databases.
- Data Pump Conventional Export/Import
- Data Pump Full Transportable
- Data Pump Transportable Tablespace
- Remote Cloning a PDB
- Remote Cloning Non-CDB
- RMAN Cross-Platform Transportable PDB
- RMAN Cross-Platform Transportable Tablespace Backup Sets
- RMAN Transportable Tablespace with Data Pump
- RMAN DUPLICATE from an Active Database
- RMAN CONVERT Transportable Tablespace with Data Pump
- SQL Developer and INSERT Statements to Migrate Selected Objects
- SQL Developer and SQL*Loader to Migrate Selected Objects
- Unplugging/Plugging a PDB
- Unplugging/Plugging Non-CDB
- Zero Downtime Migration Service