The Backdoor Entry to Oracle Database

The backdoor entry of the Oracle database! You can enter to the database through the back door using SQL * Plus tool with “Prelim” parameter  Prelim, directly connects to the SGA but it does not open a session.

You can connect to the database with Prelim as following.

[oracle@maxerman bin]$ sqlplus /nolog
SQL*Plus: Release 12.1.0.2.0 Production on Wed Oct 18 10:42:55 2017
Copyright (c) 1982, 2014, Oracle.  All rights reserved.

SQL> set_prelim on
SQL> conn / as sysdba
Prelim connection established
SQL>

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