31. The process of physically arranging data in a database to optimize its performance is called:
A) Indexing
B) Clustering
C) Partitioning
D) Fragmentation
32. In a database, a unique index is used to:
A) Ensure that the index key has no duplicate values
B) Speed up data retrieval
C) Establish a relationship between two tables
D) Define the primary key for a table
33. Which type of backup includes all the data that has changed since the last full backup?
A) Differential backup
B) Incremental backup
C) Full backup
D) Partial backup
34. Which SQL command is used to remove a table from a database?
A) DELETE TABLE
B) DROP TABLE
C) REMOVE TABLE
D) ERASE TABLE
35. The process of ensuring that data remains confidential and can only be accessed by authorized users is called:
A) Data Protection
B) Data Encryption
C) Data Security
D) Data Backup
