This assignment explores various techniques used in database administration, focusing on creation, configuration, optimization, and recovery. It delves into memory management strategies like allocating extra memory to the library cache to avoid hard parses. The document addresses common errors like page not found and provides solutions involving registry checks, listener restarts, and EM reinitialization. Furthermore, it discusses query optimization techniques such as utilizing joins, minimizing subqueries, and employing EXISTS instead of COUNT(*). Finally, it examines RMAN's role in backup, recovery, and corruption detection using commands like VALIDATE and advise failure.