Database Development

Is an Oracle SID UPPERCASE or lowercase?

This may sound silly, but is an Oracle Service Identifier (SID) aka database name normally in upper or lowercase?

According to the documentation, a SID “can contain only the characters a-z, A-Z, and 0-9”, so both upper and lowercase is allowed. In my experience, it usually doesn’t really matter. However, I am installing Oracle 11.2 on a file system that is case sensitive, and a lot of directories and files have the SID in them (e.g. initMYDB.ora).


I found a quote saying that the SID in the password file name (orapwMYDB) is case sensitive and must match the instance name.

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