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(Generated for Academic Review) Affiliation: (Conceptual Database Systems Lab) Abstract: Microsoft’s Object Linking and Embedding for Databases (OLE DB) emerged in the late 1990s as a ambitious successor to ODBC, aiming to provide universal access to both relational and non-relational data sources. Unlike its predecessor, which was constrained to SQL-based sources, OLE DB introduced a COM-based interface set designed for tabular data providers of any shape—from indexed sequential files to directory services. This paper provides a comprehensive architectural analysis of OLE DB, dissecting its core abstractions: Data Sources, Sessions, Command objects, and the critical Rowset object. We examine the dual roles of OLE DB as both a consumer interface and a provider interface, highlighting the performance implications of its cursor engine and delayed schema resolution. Furthermore, we evaluate the query processing mechanisms, particularly the interaction between consumer-side processing and provider-side indexing. Finally, we trace the decline of OLE DB in favor of ADO.NET and modern SqlClient drivers, concluding with lessons learned for contemporary polyglot data access frameworks.

OLE DB, Universal Data Access, COM, Rowset, Data Provider, Query Processing, Legacy Systems. 1. Introduction The proliferation of data sources in the client-server era of the mid-1990s presented a formidable challenge: each data store (relational database, email server, file system, directory service) exposed a proprietary API. Open Database Connectivity (ODBC) solved part of the problem by standardizing SQL-based relational access but explicitly excluded non-relational, non-SQL, or hierarchical data sources. We examine the dual roles of OLE DB

OLE DB: A Retrospective Analysis of a Universal Data Access Paradigm, Its Architecture, Query Processing, and Legacy Impact OLE DB, Universal Data Access, COM, Rowset, Data