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how to reset the password in Oracle 11g Express Edition

Have Oracle 11g Express Edition installed on my private laptop machine. The password has expired. I use SQL developer to connect ...but don't find any way of resetting the password. I am unable to start sqlplus as the machine says('sqlplus' unknown command. and am not sure how to start database from 'run Sql Command line '. Please tell me how to reset the password.

TNS Entry is :

XE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = Tritonia)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XE)
)
)

Code snippet from

SQL*Plus: Release 11.2.0.2.0 Production on Thu Oct 6 01:50:39 2016

Copyright (c) 1982, 2014, Oracle.  All rights reserved.

SQL> system
SP2-0042: unknown command "system" - rest of line ignored.
SQL> select * from dual;
SP2-0640: Not connected
SQL> select * from dual;
SP2-0640: Not connected
SQL> startup
ORA-01031: insufficient privileges
SQL>

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Alex [***Alex140181***]

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slightwv (䄆 Netminder)

Alex provided the syntax on how to reset a password.

>>SP2-0042: unknown command "system" - rest of line ignored.

I wanted to comment on this line. Once you are in sqlplus, to connect as a different user you need the connect command:
SQL> connect system

Note: sqlplus commands can be shortened to their first 4 characters so this is also valid:
SQL> conn system

Flex Tron

ASKER

Works like a charm. Danke !

Alex [***Alex140181***]

You're welcome ;-)