Interview Questions

1. What is Transparent Data Encryption?

Transparent Data Encryption (TDE) is a feature introduced in SQL Server 2008 and available in later versions for bulk encryption at the database file level (data file, log file and backup file) i.e. the entire database at rest. Once enabled for a database, this feature encrypts data into pages before it is written to the disk and decrypts when read from the disk. The best part of this feature is, as its name implies, it’s completely transparent to your application. This means literally no application code changes (only administrative change to enable it for a database) are required and hence no impact on the application code\functionalities when enabling TDE on a database being referenced by that application.

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