Object caching is a mechanism used by SharePoint to cache site, page, and page layout properties. Disk caching is used to cache BLOBs so that they do not have to be retrieved from the database. Object and disk caching are extremely fast and can significantly improve performance of sites, especially when large media files are involved. By default, object caching is always on, and disk caching is turned off. In order to enable disk caching, you must edit the web.config file for the web application where you want to use it.
A redundant array of inexpensive (or redundant) disks is a storage solution that uses multiple disks that function together to provide reliable data recovery. RAID can prevent the loss of data and/or improve performance. It can be used to provide connectivity when an organization’s primary ISP’s service becomes unavailable. RAID provides several methods of writing data across multiple disks, and writing to several disks. Rather than losing a single disks and all the information, administrators can replace the damaged risks and regenerate the data quickly.
The programs used to perform the compression and decompressions of image files are called codecs (compression decompression software). Many of them are integral parts of the most popular file formats for moving images like JPEG, MPEG-2, MPEG-4 and QuickTime, and some can compress and decompress the information on the fly. Compression is about reducing the size of the file so that the transmission time is shorter and the storage requirements are smaller. Decompression is about bringing back the data to a format that can be viewed with standard software.
Input source file → Compression Algorithm → Output compressed file
Input compressed file → Decompression Algorithm → Output decomposed file
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