Saturday, November 5, 2011

SharePoint BLOB Caching to increase performance

BLOB caching, or disk-based caching, is an out of the box (OOTB) caching mechanism that is built into the MOSS 2007 and SharePoint Server 2010 platforms. It is commonly used to speed-up access to large and relatively static resources that are stored in content databases, such as images, videos, javascript files, and more. Performance improvements are gained by storing these assets on web front-ends (WFEs) once they’ve been requested by a client. This allows SharePoint to serve subsequent requests for such assets directly from WFEs instead of round-tripping to the content database each time a request for such an asset is received. For most SharePoint sites, this type of caching can significantly lighten the load on your SQL Servers and back-end network.

BLOB Caching is controlled through the web.config file for each of the IIS web sites that is associated with a Web application, and it is not enabled by default. Enabling BLOB caching is as simple as setting the enabled attribute to true in the web.config element as shown below.

  BlobCache location=C:\blobCache” path=”\.(gif|jpg|png|css|js)$” maxSize=”10” enabled=true/>

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