Database security is essential for the organisations working in healthcare and financial sector because the databases in such organisations contain sensitive and confidential information about their customers. The organisation working in such sectors also falls under the boundaries of data regulatory and compliance requirements (such as HIPAA, PCI-DSS, SSAE16 etc.) which require the encryption of sensitive data inside databases and at operating system level. SQL Server offers a variety of options for encryption which includes Transparent Data Encryption (TDE). This feature is available in since the release of SQL Server 2008 and provides us the real-time encryption of data and log files. The Transparent Dat Encryption (TDE) also encrypts backups, snapshots and transaction logs of the database.
Checkout my article here in which I discussed the architecture of Transparent Data Encryption (TDE), and the process of implementing Transparent Data Encryption (TDE) on standalone and mirrored database.
This article is published on SSWUG.org.