Oracle 1z0-1093-23 Dumps

The action that causes an error when creating a MySQL DB system is using the username “mysql.sys”. This is because “mysql.sys” is a reserved username for the MySQL system schema, which contains views and stored procedures that implement server functionality1. You cannot create a user with the same name as the system schema, as it would cause conflicts and errors1. You should choose a different username for the administrator of the MySQL DB system, such as “mysql.admin” or “mysql.user”.

The other actions do not cause errors, but they may have some implications:

• Storage size of 50 GB is not too small, but it may not be enough for your database workload and growth. You can choose a storage size from 50 GB to 16 TB when creating a MySQL DB system2. You can also scale up the storage size later if needed2.
• Host name of “mysql-host” is valid, but it should be unique within the subnet where the DB system is deployed2. You can use letters, numbers, and hyphens in the host name, but it must start and end with a letter or a number2.
• Maintenance Window start day and time is not required, but it is recommended to specify a preferred time for applying maintenance updates to the DB system2. If you do not specify a Maintenance Window, Oracle will assign a random day and time for the maintenance updates2.

References:

• MySQL :: MySQL 8.0 Reference Manual :: 5.6 The mysql System Schema
• MySQL :: MySQL Database Service User Guide :: 3.1 Creating a MySQL DB System

To consolidate two databases into a single Oracle Home, you need to perform the following actions1:

• Schedule a downtime window with the team using the 193B database. This is necessary because you need to stop the database service and detach the pluggable databases (PDBs) from the source Oracle Home before moving them to the target Oracle Home2.
• Use the Move Database option from the console to relocate the database to the target Oracle Home. This is the easiest and fastest way to move the database and its PDBs to a different Oracle Home. You can use the Oracle Cloud Infrastructure Console or the API to initiate the move operation, which will automatically copy the required files, update the configuration, and restart the database service in the target Oracle Home3.

Therefore, statements A and D are correct, and statements B and C are incorrect. Copying the sqlnet.ora and spfile from OH193_B to OH193_A and restarting PDBs is not sufficient to move the database to a different Oracle Home, as it does not update the Oracle Inventory, the Oracle Restart configuration, or the database registry4. Creating a new container database under OH193B and migrating the PDBs from 193B to 193A is not necessary, as you can move the existing PDBs directly to the target Oracle Home without creating a new container database5. References: 1: Oracle Base Database Services 2023 Professional, Section 4.2.2: Moving a Database to a Different Oracle Home 2: Base Database Service, Section 4.2.2.1: Prerequisites for Moving a Database to a Different Oracle Home 3: Base Database Service, Section 4.2.2.2: Moving a Database to a Different Oracle Home 4: [Oracle Database Administrator’s Guide], Section 2.4.1: Moving Oracle Database to a New Oracle Home 5: [Oracle Database Administrator’s Guide], Section 19.1.1: Overview of Pluggable Database Migration

 The recommended subnet configurations for Exadata Database Service are to use regional subnets for both client and backup, or to use a private subnet for client and a private subnet for backup12. Regional subnets span all availability domains in the region, which provides high availability and flexibility for the Exadata Database Service1. Private subnets are isolated from the internet and provide more security and control for the Exadata Database Service1. Using a public subnet for client or backup exposes the Exadata Database Service to the internet, which is not recommended1. Using a service subnet for backup is not supported, as service subnets are reserved for Oracle Cloud Infrastructure services3. References:

• Network Setup for Exadata Cloud Infrastructure Instances
• Service Gateway
• Oracle Exadata Cloud Service (ExaCS) Networking