Question: What is Oracle SID in Database? Answer: SID = identifies the database instance (database name + instance number). So if your database name is some and your instance number is 3, then your SID is somedb3 (E learning). Note: Browse latest Weblogic interview questions and Weblogic tutorial. Here you can check Weblogic Training details and Weblogic training videos for self learning. Contact +91 988 502 2027 for more information.