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SQL Server Windows authentication uses application's process identity or thread identity to connect. So, for a solution deployed to a SharePoint farm which identity will be used to connect

  1. Current User Context
  2. Application Pool Identity
  3. Process Identity

    or another identity?!

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The identity of an application pool is the name of the account under which the application pool's worker process runs...Application pool identity and process identity are same. – Amit Kumawat Dec 12 '11 at 6:52
up vote 3 down vote accepted

It is the Application Pool Identity.

For more information, see

SharePoint takes care of providing appropriate permissions for this account.

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