ArcSDE database is the answer when you want to make use of a large database which can be used by many people, simultaneously, with provision for multiuser editing. It helps managing a multi-user database supporting various critical versions of GIS work-charts.
One of the important advantages of this technology is the leverage that the user obtains for relational databases, even as ArcSDE database works with multiple DBMS storage models. They are put to use in a variety of ranges which can include groups, individuals, enterprises or in departmental settings.
Deriving advantages from DBMS architectures, they can support huge databases, which may be continuous GIS nature even as a number of users can access them, allowing for lengthy versioned workflows and transactions, GIS management can make use of relational database support, for security, reliability, integrity, backup and retrieval.
The experience of implementing many databases have proved that DBMS are easily able to handle binary large objects (BLOBs), that are images or multimedia data, which are essential in managing GIS. More importantly usage of BLOBs yields large volumed GIS databases which file-based GIS databases cannot match.
An important role of ArcSDE database is to support GIS databases’ framework of versioning, in individual DBMS. Very often, GIS editing work can effect a number of tables and rows in a database. In such a situation, editing requires changing a variety of records in equally many tables. Users would like the entire editing to be counted as a single transaction. ArcSDE not allows this, when changes are rolled back, or reversed, it allows to manage it as a unified transaction.
The system allows users to undo the entire editing work, and redo the same, even if the editing is done while not connected to a central database.
Thus this database has multiple uses in GIS.