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I am connecting to Oracle DB using sysdba:

sqlplus / as sysdba

What is the default password for sysdba user. I tried in net and found out the default password is change_on_install but it is not working for me.

I am interested to know if Oracle DB maintains some file or DB table where it stores the passwords.

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    SYSDBA isn't a username, it's a connection option. Normally, you connect to SQL*Plus using sqlplus user/password or sqlplus sys/sys_password as sysdba. If you're logged into the machine running Oracle, and the user you're logged in has suitable privileges on the machine (normally membership of a certain group), you can log in without a username and password, by writing sqlplus / as sysdba. This logs you in as the user SYS. – Luke Woodward Mar 27 '13 at 14:58
  • Possible duplicate of dba.stackexchange.com/questions/34734/… and dba.stackexchange.com/questions/36350/… – Yasir Arsanukaev Mar 27 '13 at 23:16
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    Just a friendly tip: if you're not sure you know what you're doing, connecting as SYS (which is analogous to a "root"-type account in a unix system) is a recipe for disaster. The best thing you can do is create a lower-privileged user, then login as that user. – Jeffrey Kemp Mar 28 '13 at 5:39
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SYSDBA is not a user, it is a system privilege. When you connect as / you are connecting to the SYS user. You don't need a password when you connect as you are - as long as it's a local connection from an OS account in the DBA group.

You haven't said what happens when you try to connect, or why you think you need a password; possibly that is that failing (in which case giving the error message would be helpful) and giving you a SQL*Plus login prompt, maybe indicating you aren't in that group.

Passwords are stored within the DB, the exact location depends on version; but they're stored hashed (of course) so you're not going to be able to get the actual passwords in plaintext (without a lot of time and effort anyway).

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Oracle stores password for SYS and internal user's password in PWD###.ora file, where ### is your DB service Name/SID. I found a nice tutorial on orapwd utility to change password for SYS:

Lost Oracle SYS and SYSTEM password?

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I had the same issue and then I realized that I was trying to login as root. I installed the database as "oracle" user but then I opened the other terminal which was root by default. so login as "oracle" or whatever user you used to login and it should work.

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