Sometimes, you need to know the Oracle database instance name on which your SQL is being executed. For instance, say you have to print a DBA report for which you have prepared a set of scripts, and which you want to execute on each database. You also want the name of the database instance at the top of report, followed by statistics for that. Of course, you don't want to change the script for each instanceyou want a generic script.
To get the name of the Oracle instance, query the GLOBAL_NAMES view in Oracle, like this:
SELECT * FROM