Oracle: Modifying Data & Multiple Databases MCQs

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Oracle: Modifying Data & Multiple Databases Subcategories

Advanced DML & Data Movement	Common Errors & Integrity During DML
Database Links & Distributed Operations	Database Links & Replication
DML & Transactions	DML Statements & Locking
Moving & Loading Data

Which statement correctly inserts a row into the EMP table?

INSERT INTO emp (id, name) VALUES (1, 'Ali');
INSERT emp VALUES INTO (1, 'Ali');
ADD INTO emp (id, name) VALUES (1, 'Ali');
INSERT INTO emp SET id = 1, name = 'Ali';

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What happens if an UPDATE statement has no WHERE clause?

All rows in the table are updated
Only the first row is updated
The statement fails
No rows are updated

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Which statement cannot be rolled back because it commits automatically?

DELETE
UPDATE
INSERT
TRUNCATE TABLE

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What does COMMIT do?

Undoes all changes
Locks the table permanently
Makes all changes of the current transaction permanent
Creates a savepoint

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What does ROLLBACK do?

Commits all changes
Deletes the table
Undoes uncommitted changes of the current transaction
Reverses already committed work

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What is the purpose of SAVEPOINT?

To save the table to disk permanently
To mark a point within a transaction to which you can partially roll back
To create a backup
To lock a row

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Which action implicitly commits the current transaction in Oracle?

Executing a SELECT statement
Executing an INSERT statement
Creating a SAVEPOINT
Executing a DDL statement such as CREATE TABLE

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Which ACID property means a transaction is 'all or nothing'?

Consistency
Isolation
Durability
Atomicity

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What does SELECT ... FOR UPDATE do?

Updates the rows automatically
Deletes the rows
Locks the selected rows until the transaction ends
Copies the rows to a new table

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Which Oracle structure provides read consistency for queries?

Redo logs
Control file
Undo data
Password file

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