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SDE allows organizations to realize the benefits of central DBMS management of spatial data such as multilevel security, backup recovery, and failover handling. SDE dramatically increases the number of users who can be supported with traditional NFS file mounting, and provides faster query response when compared to a large, traditional, tiled GIS database. By combining the spatial database manager from ESRI with the high- performance and extensibility of Universal Data Option, SDE for Informix gives users the ability to store, query, analyze, and retrieve large amounts of spatial information easily and quickly with spatial and attribute query functions that access data natively using SQL.