Explanation
If your organization is small, or if you are still in the proof-of-concept stage of evaluating OracleCloud Infrastructure, consider placing all of your resources in the root compartment (tenancy). This approach makes iteasy for you to quickly view and manage all your resources. You can still writepolicies and create groups to restrict permissions on specific resources to only the users who need access.If you plan to maintain all your resources in the root compartment,we recommend setting up aseparate sandbox compartment to give users a dedicated space to try out features. In the sandbox compartment, you can grant users permissions to create and manage resources, whilemaintaining stricter permissions on the resourcesin your tenancy (root) compartment.
https://www.oracle.com/a/ocom/docs/best-practices-for-iam-on-oci.pdf

Explanation
Object Lifecycle Management lets you automatically manage the archiving and deletion of objects. By using Object Lifecycle Management to manage your Object Storage and Archive Storage data, you can reduce your storage costs and the amount of time you spend managing data.
Use object name filters to specify which objects the lifecycle rule applies to.
You can add object filters in any order. Object Lifecycle Management evaluates the precedence of the rules as follows:
Pattern exclusions
Pattern inclusions
Prefix inclusions

Explanation
With multipart upload, you split the object you want to upload into individual parts. Individual parts can be as large as 50 GiB or as small as 10 MiB. (Object Storage waives the minimum part size restriction for the last uploaded part.) Decide what part number you want to use for each part. Part numbers can range from 1 to
10,000. You do notneed to assign contiguous numbers, but Object Storage constructs the object by ordering part numbers in ascending order.
The maximum size for an uploaded object is 10 TiB
While a multipart upload is still active, you can keep adding parts as long as thetotal number is less than
10,000.
https://docs.cloud.oracle.com/en-us/iaas/Content/Object/Tasks/usingmultipartuploads.htm

Explanation
On autonomous there's no patching needed. But on the regular DB Cloud services you need to patch the DB and the OS. During the creation on the OCDB the first DB is created automatically Oracle automatically takes care of Operating system Installation/Configuration, Grid Infrastructure, ASM diskgroup Creation/Configuration , and database softwareInstallation and first database on the DB System.
that's all when Creating DB Systems. and then the customer responsible to apply the patches to the database and OS