Journal of Cybersecurity and Information Management JCIM 2690-6775 2769-7851 10.54216/JCIM https://www.americaspg.com/journals/show/4062 2019 2019 Department of Computer Science & Engineering, Indira Gandhi University, Meerpur Rewari, India Deepak Deepak Department of Computer Science & Engineering, Indira Gandhi University, Meerpur Rewari, India Savita Sheoran The growth of Large Language Models (LLMs) applications has intensified the demand for efficient vector database solutions capable of handling high-dimensional semantic search operations. Contemporary information retrieval systems face significant challenges in processing complex queries across vast knowledge repositories while maintaining contextual accuracy and computational efficiency. This research investigates the optimization potential of vector search implementations in LLMs through comprehensive evaluation using MongoDB Atlas as the primary vector database platform. Traditional keyword-based retrieval methods fail to capture semantic relationships and contextual nuances essential for accurate information extraction in modern AI applications. Vector-based query optimization enables semantic similarity matching, allowing systems to access contextually relevant data or information even when exact keyword matches are absent. But it significantly improving response quality and user experience. The study addresses critical performance bottlenecks in production-scale vector search deployments, where query latency and retrieval accuracy directly impact system usability. Through systematic comparison of traditional text-embedding-ada-002 against the advanced text-embedding-3-small model, we demonstrate substantial performance enhancements across multiple evaluation metrics. Results establish text-embedding-3-small as superior for semantic search applications, while GPT-4o-mini demonstrates optimal faithfulness performance (0.9067) for accuracy-critical deployments. 2026 2026 146 166 10.54216/JCIM.170211 https://www.americaspg.com/articleinfo/2/show/4062