step 1: Always OracleTNSListener, Orcl (i.e database) to be restarted--> it should be in "started" mode step2: configure the database program-->oracle-oradb11g_home1-->configuration and migration tools--> database configuration assistant-->next configuration database options-->next-->(database,username, password)-->next-->database components -->"oracle label security" (select check box)-->next-->dedicated server mode-->finish (this is one time or first time, no need to do always)
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Username sys password oracle
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Creating environment variables
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My computer mouse right click properties
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System properties advanced
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Advanced environment variables
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Click new new user variable appear type “oracle_home” in
variable name (you can type any name) type variable value