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OCA: Oracle Database 12c Administrator Certified Associate Study Guide is a technical certification manual by Biju Thomas, published by Sybex for the Oracle Database 12c OCA pathway. It combines preparation for Exam 1Z0-061, SQL Fundamentals, and Exam 1Z0-062, Installation and Administration, in one large reference and practice volume. The book is organized in two broad parts: relational SQL skills first, followed by the architecture, operation, maintenance, security, networking, and recovery responsibilities of an entry-level Oracle database administrator. Its purpose is not merely to list exam facts. It connects commands and administrative tools to the database structures and operational decisions they affect. Study aids include an initial assessment, chapter review questions, practice exams, electronic flashcards, a glossary, practical labs, and Exam Essentials sections. Thomas writes from substantial Oracle development and administration experience, which supports the book practical orientation. As a 2014 guide, its certification objectives and product version are historically specific, but its core treatment of SQL and foundational Oracle administration remains the basis for understanding the material it covers.