RDS Custom for Oracle requirements and limitations
In this topic, you can find a summary of the Amazon RDS Custom for Oracle feature availability and requirements for quick reference.
Topics
General requirements for RDS Custom for Oracle
Make sure to meet the following requirements for Amazon RDS Custom for Oracle:
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You have access to My Oracle Support
and Oracle Software Delivery Cloud to download the supported list of installation files and patches for RDS Custom for Oracle. If you use an unknown patch, custom engine version (CEV) creation fails. In this case, contact the RDS Custom support team and ask it to add the missing patch. For more information, see Step 2: Download your database installation files and patches from Oracle Software Delivery Cloud. -
You have access to Amazon S3. You need this service for the following reasons:
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You upload your Oracle installation files to S3 buckets. You use the uploaded installation files to create your RDS Custom CEV.
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RDS Custom for Oracle uses scripts downloaded from internally defined S3 buckets to perform actions on your DB instances. These scripts are necessary for onboarding and RDS Custom automation.
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RDS Custom for Oracle uploads certain files to S3 buckets located in your customer account. These buckets use the following naming format:
do-not-delete-rds-custom-account_id-region-six_character_alphanumeric_string. For example, you might have a bucket nameddo-not-delete-rds-custom-123456789012-us-east-1-12a3b4.
For more information, see Step 3: Upload your installation files to Amazon S3 and Creating a CEV.
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You use the DB instance classes listed in DB instance class support for RDS Custom for Oracle to create your RDS Custom for Oracle DB instances.
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Your RDS Custom for Oracle DB instances run Oracle Linux 8 (recommended) or Oracle Linux 7. If you require Oracle Linux 7, contact Amazon Web Services Support. For more information, see Considerations for RDS Custom for Oracle database upgrades.
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You specify the gp2, gp3, or io1 solid state drives for Amazon EBS storage. The maximum storage size is 64 TiB.
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You have an Amazon KMS key to create an RDS Custom for Oracle DB instance. For more information, see Step 1: Create or reuse a symmetric encryption Amazon KMS key.
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You have the Amazon Identity and Access Management (IAM) role and instance profile required for creating RDS Custom for Oracle DB instances. For more information, see Step 4: Configure IAM for RDS Custom for Oracle.
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The Amazon Identity and Access Management (IAM) user that creates a CEV or RDS Custom DB instance has the required permissions for IAM, CloudTrail, and Amazon S3.
For more information, see Step 5: Grant required permissions to your IAM user or role.
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You supply your own virtual private cloud (VPC) and security group configuration. For more information, see Step 6: Configure your VPC for RDS Custom for Oracle.
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You supply a networking configuration that RDS Custom for Oracle can use to access other Amazon Web Services services. For specific requirements, see Step 4: Configure IAM for RDS Custom for Oracle.
General limitations for RDS Custom for Oracle
The following limitations apply to RDS Custom for Oracle:
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You can't modify the DB instance identifier of an existing RDS Custom for Oracle DB instance.
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You can't specify the Oracle multitenant architecture for any release except Oracle Database 19c.
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You can't create multiple Oracle databases on a single RDS Custom for Oracle DB instance.
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You can’t stop your RDS Custom for Oracle DB instance or its underlying Amazon EC2 instance. Billing for an RDS Custom for Oracle DB instance can't be stopped.
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You can't use automatic shared memory management because RDS Custom for Oracle supports automatic memory management only. For more information, see Automatic Memory Management
in the Oracle Database Administrator’s Guide. -
Make sure not to change the
DB_UNIQUE_NAMEfor the primary DB instance. Changing the name causes any restore operation to become stuck. -
You can't make more than 20 snapshot copies at the same time in the same Region.
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You can't use the
describe-reserved-db-instancesAPI for RDS Custom for Oracle DB instances.
For limitations specific to modifying an RDS Custom for Oracle DB instance, see Modifying your RDS Custom for Oracle DB instance. For replication limitations, see General limitations for RDS Custom for Oracle replication.
CEV and AMI limitations for RDS Custom for Oracle
The following limitations apply to RDS Custom for Oracle CEVs and AMIs:
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You can't provide your own AMI for use in an RDS Custom for Oracle CEV. You can specify either the default AMI, which uses Oracle Linux 8, or an AMI that has been previously used by an RDS Custom for Oracle CEV.
Note
RDS Custom for Oracle releases a new default AMI when common vulnerabilities and exposures are discovered. No fixed schedule is available or guaranteed. RDS Custom for Oracle tends to publish a new default AMI every 30 days.
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You can't modify a CEV to use a different AMI.
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You can't create a CDB instance from a CEV that uses the
custom-oracle-eeorcustom-oracle-se2engine types. The CEV must usecustom-oracle-ee-cdborcustom-oracle-se2-cdb. -
RDS Custom for Oracle doesn't currently allow you to upgrade the OS of your RDS Custom for Oracle DB instance with RDS API calls. As a workaround, you can update your OS manually with the following command:
sudo yum update --security.
Unsupported settings for create and modify workflows
When you create or modify an RDS Custom for Oracle DB instance, you can't do the following:
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Change the number of CPU cores and threads per core on the DB instance class.
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Turn on storage autoscaling.
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Create a Multi-AZ deployment.
Note
For an alternative HA solution, see the Amazon blog article Build high availability for Amazon RDS Custom for Oracle using read replicas
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Set backup retention to
0. -
Configure Kerberos authentication.
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Specify your own DB parameter group or option group.
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Turn on Performance Insights.
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Turn on automatic minor version upgrade.
DB instance quotas for your Amazon Web Services account
Make sure that the combined number of RDS Custom and Amazon RDS DB instances doesn't exceed your quota limit. For example, if your quota for Amazon RDS is 40 DB instances, you can have 20 RDS Custom for Oracle DB instances and 20 Amazon RDS DB instances.