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Transparent Data Encryption (TDE) is the appropriate method for ensuring that the underlying database files are encrypted at rest. TDE encrypts the database files themselves, protecting the data in case the physical media is stolen, while allowing the data to be viewed in clear text by authorized users within the system.

Transparent Data Encryption: Encrypts data at rest, ensuring that the database files are secure.

Salesforce Transparent Data Encryption

The UpdateDE function in AMPscript updates the data extension rows as the emails are being sent. If the send is canceled and only 400 emails are sent, then only the 400 subscribers who received the email will have their data extension rows updated by the UpdateDE function.

Salesforce AMPscript UpdateDE Function

When configuring a Send Log Data Extension, it is crucial to follow best practices to ensure efficient tracking and data management.

Use Data Retention: Implementing data retention policies helps manage the volume of data stored in the send log, improving performance and reducing storage costs.

Limit Custom Fields: Limiting the number of custom fields to 10 or fewer helps maintain the efficiency and performance of the data extension.

Salesforce Send Log Data Extension

To identify all subscribers who were sent Job ID 420 but did not click any links, the developer should use a SQL statement that selects subscribers from the _Sent Data View where the Job ID is 420 and excludes those who are found in the _Click Data View. The correct SQL statement is:

SELECT s.SubscriberKey FROM _Sent s LEFT JOIN _Click c ON s.SubscriberKey = c.SubscriberKey AND s.JobID = c.JobID WHERE s.JobID = '420' AND c.SubscriberKey IS NULL

This query performs a left join between the _Sent and _Click data views and filters the results to include only those subscribers who do not have a corresponding click record.