Personal geodatabases-All datasets are stored within a Microsoft Access data file, which is limited in size to 2 GB.The file geodatabase is recommended over personal geodatabases. Each dataset is held as a file that can scale up to 1 TB in size. File geodatabases-Stored as folders in a file system.The geodatabase is a “container” used to hold a collection of datasets. The GIS environment routes all connections to the database through the ArcSDE middleware, which manages the storing and retrieval of data ( wiki source). The user need have no awareness of nor dealings with the particulars of the RDBMS. While traditional RDBMS software keeps track of the tables and records contained in the database, ArcSDE pushes the relational model higher so that client software can manage geographic data – which comprise several tables – seamlessly. The spatial data may then be used as part of a geodatabase ( wiki source). ArcSDE (Spatial Database Engine) is a server-software sub-system (produced and marketed by Esri) that aims to enable the usage of Relational Database Management Systems for spatial data.
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