//////////////////////////////////////////////////////////////////////////////// /// @brief storage engine /// /// @file /// /// DISCLAIMER /// /// Copyright 2004-2013 triAGENS GmbH, Cologne, Germany /// /// Licensed under the Apache License, Version 2.0 (the "License"); /// you may not use this file except in compliance with the License. /// You may obtain a copy of the License at /// /// http://www.apache.org/licenses/LICENSE-2.0 /// /// Unless required by applicable law or agreed to in writing, software /// distributed under the License is distributed on an "AS IS" BASIS, /// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. /// See the License for the specific language governing permissions and /// limitations under the License. /// /// Copyright holder is triAGENS GmbH, Cologne, Germany /// /// @author Dr. Frank Celler /// @author Copyright 2011-2013, triAGENS GmbH, Cologne, Germany //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// /// @mainpage /// /// The Durham Storage Engine stores documents (aka objects or JSON documents) /// in datafiles within the filesystem. These documents are mapped into the /// process space using mmap. Instead of using JSON, BSON, or XML to store the /// documents a very concise representation, namely JSON Shapes, is used. /// This allows for verbose attributes name, while still being space efficient. /// Access to attributes can be precompiled and is therefore incredible fast. /// /// @section Interface /// /// The Store Engine groups documents into collections. Each /// collection can be accessed using queries. These queries can either /// be expressed using a query language or JavaScript. /// /// @section DataStructures Data Structures /// /// The key data structures are @ref ShapedJson "JSON Shapes". JSON Shapes /// allow the Durham Storage Engine to store documents in a very space /// efficient way. /// /// @section CollectionsDatafiles Collections and Datafiles /// /// All data is stored in datafiles. The internal structure of a datafile is /// described in @ref DurhamDatafiles "Datafiles". All datafiles of a set of /// documents are grouped together in a @ref DurhamCollections "Collection". ////////////////////////////////////////////////////////////////////////////////