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Google BigTable is a nonrelational, distributed and multidimensional data storage mechanism built on the proprietary Google storage technologies for most of the company's online and back-end applications/products. It provides scalable data architecture for very large database infrastructures.
Google BigTable is mainly used in proprietary Google products, although some access is available in the Google App Engine and third-party database applications.
Google BigTable is a persistent and sorted map. Each string in the map contains a row, columns (several types) and time stamp value that is used for indexing. For example, the string of data for a website is saved as follows:
Google BigTable is built on technologies like Google File System (GFS) and SSTable. It is used by more than 60 Google applications, including Google Finance, Google Reader, Google Maps, Google Analytics and Web indexing.