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D:\ instantclient_12_2 > sqlplus hr/hr@pdbtest

SQL*Plus: Release 12.2.0.1.0 Production on Fri Dec 29 15:32:34 2017

Copyright (c) 1982, 2016, Oracle. All rights reserved.

Last Successful login time: Fri Dec 29 2017 15:16:43 + 08:00

Connected to:

Oracle Database 12c Enterprise Edition Release 12.2.0.1.0-64bit Production

SQL > history

SP2-1650: History is off, use "SET HIST [ORY] ON" to enable History.

SQL > SET HIST ON

SQL > show hist

History is ON and set to "100"

SQL > hist

1 show hist

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