Which code， inserted at line 14， will allow this class to correctly serialize and deserialize？（） s.defaultReadObject（）；。 this = s.defaultReadObject（）；。 y = s.readInt（）； x = s.readInt（）；。 x = s.readInt（）； y = s.readInt（）；。
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One of the users in the PROD database，Adams，complains that his update on the table，TRANS， is taking an unusually long time to complete. You find that the table gets locked by another database user before Adams starts his transactions，and you are unable to contact the user holding the table lock. As Adams is updating some crucial rows in the table， he should get the highest priority. Which method would you use to overcome this problem？（） execute the command， ALTER SESSION KILL ..， to kill the blocking session。 execute the DBMS_SESSION.KILL_SESSION procedure to kill the blocking session。 execute the command， ALTER SYSTEM KILL SESSION ..， to kill the blocking session。 execute the command， ALTER SESSION UNLOCK ..， to release the lock for the blocking session。 execute the command， ALTER SYSTEM UNLOCK SESSION ..， to release the lock for the blocking sessio。
You want to make use of the object features available in the database for the form module you are developing. Which three statements about object types are true? （） An object type is a user-defined composite data type. 。 The attributes of an object type can be those of other object types. 。 A PL/SQL table of records is an example of a nested object type. 。 An object type must be declared as a type before the actual object itself can be declared.。
You have a durable subscriber, and the subscriber is down or not reachable when the message is produced. Which two options regarding the expiry of these messages are true?（）
