Online Access Free 1Z0-921 Practice Test

How does MySQL HeatWave improve query performance?
Response:

• A.By caching the entire database in memory.
• B.By automatically creating indexes on frequently used columns.
• C.By replicating data across multiple servers.
• D.By offloading analytics queries to an in-memory, highly parallel processing engine.

You have created your Compute instance using an Oracle-provided Oracle Linux image.
You want to log in to your OCI Compute instance using SSH. Which three items do you need for this process?

• A.SSH private key
• B.SSH public key
• C.User Password
• D.The root user
• E.Public IP address
• F.The opc user

Which three statements describe MySQL Enterprise Backup?

• A.MySQL Enterprise Backup can be used to send backups to Oracle Cloud Infrastructure Storage Service.
• B.MySQL Enterprise Backup can be used to import/export data from on-premises MySQL installations.
• C.MySQL Enterprise Backup provides the point-in-time recovery functionality.
• D.MySQL Enterprise Backup offers backup based on Oracle RMAN with optimized row locking.
• E.MySQL Enterprise Backup is an optimized backup based on mysqldump with optimized row locking.

Your newly-created Oracle Cloud Infrastructure instance is not available for login in. Which is a valid reason for this issue?

• A.Only root is allowed to access from non-localhost.
• B.The OCI instance is still in the "creation" process.
• C.You forgot to enable port 3306.
• D.The opc user can be used to access MySQL only with the created SSH-Key.
• E.You forgot to create the correct SSL/TLC certificate during the setup process.

Which query will find rows in a table that have no counterpart in another table?

• A.SELECT *FROM table1 INNER JOIN table2 ON table1.id=table2.id WHERE table1.id=! table2.id;
• B.SELECT left_tbl.*FROM left_tbl LEFT JOIN right_tbl ON left_tbl.id=right_tbl.idWHERE right_tbl.id IS NULL;
• C.SELECT t1.name, t2.name2FROM employee t1 INNER JOIN info t2 WHERE t1.name=t2.name;
• D.SELECT t1.name, t2.name2FROM employee AS t1 INNER JOIN info AS t2 ON t1.name= t2.name2;