Differenced File by Last Modify Time: The SQL writer uses the VSS Differenced File by Last Modify Time mechanism for reporting changed files in fulltext catalogs.Partial File: The SQL writer uses the VSS Partial File mechanism for reporting changed byte ranges within its database files.Differential backup and restore: The SQL writer supports differential backup and restore through two VSS differential mechanisms: Partial File and Differenced File by Last Modify Time.They are automatically included in the backup when the database component is selected Fulltext: The SQL writer reports fulltext catalog containers with recursive file specifications under the database components in the writer's metadata document.This is done to facilitate the enumeration of these User Instances during a VSS backup operation. In certain cases where an instance of SQL Server Express is installed and an application is using the User Instances feature, the SQL writer may be automatically started by SQL Server. Configuring the service as a Local System account provides sufficient rights for the service to run correctly. Since the SQL writer needs to talk to SQL Server using exclusive VDI APIs, the SQL writer account must have sufficient access rights for both SQL Server and VSS. SQL Writer Service AccountÄuring installation, the SQL writer account will be installed to use the Local System account. #WINDOWS SHADOW COPY SPACE REQUIREMENTS WINDOWS#The SQL writer service is installed in the system as part of the SQL Server installation and is configured to start automatically when Windows starts. The role of the SQL writer in a VSS snapshot backup operation: The SQL writer ships with SQL Server as a standalone service and is installed as part of the SQL Server installation. It handles the VSS interaction with SQL Server. The SQL writer is a VSS writer provided by the SQL Server. See the documentation on Volume Shadow Copy Service for details. In this paper, a requestor is also used to imply a backup application that is creating a snapshot of SQL Server databases. Requestor: A process (either automated or GUI) that requests that one or more snapshot sets be taken of one or more original volumes. For more information, see SQL Server 2005 Virtual Backup Device Interface Specification. #WINDOWS SHADOW COPY SPACE REQUIREMENTS FULL#These APIs are engineered to provide maximum reliability and performance, and support the full range of SQL Server backup and restore functionality, including the full range of hot and snapshot backup capabilities. #WINDOWS SHADOW COPY SPACE REQUIREMENTS SOFTWARE#Virtual Device Interface: SQL Server provides an application programming interface called Virtual Device Interface (VDI) that helps independent software vendors to integrate SQL Server into their products by providing support for backup and restore operations. Other such writers might be Exchange Server, etc. In such a scenario, SQL Server (including the SQL writer) is acting as a writer in one of the Writer boxes. This diagram shows all the components participating in a typical VSS snapshot activity. VSS provides coordination between these parties: Our design is focused on the scenario where the requestor is a backup application.
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