I m an XP system and I m trying to find the Jazn environment for Oracle, but I can t find it.

Right-click on my computer, go to the management, find the service, and see if the Oracle listening service and instance service are automatically booted up. If not, it must be set to start automatically at power-on.

regedit Check the Oracle Portal or Oracle Service to see if it still exists.

Just check that one to ignore all, and there will be no problem.

sqlplus nolog: Open SQL Management.

conn sys as sysdba into the super admin.

alter user account identified by new password.

That's it.

If you have set a password and have forgotten it, I recommend reinstalling it.

Click Run SQL command line.

Enter sqlplus to try it out.

What version you pretend, it means you've never seen anything like this.

According to the display instructions, it has been installed successfully.

Look**You have Oracle Database Express Edition 11G Release 2 installed, start the database, and then click Start on the desktop. You can refer to it for details.

The oracle is completely uninstalled and reinstalled, because it is not uninstalled cleanly, so the errors and methods that appear can be searched on the Internet.

c The connection string and SQL access statement for accessing the Oracle database in Windows are the same

1、string connstr = "data source=DB instance name; persist security info=true;user id=username; password=password; unicode=true";

2. Query the database through C** as follows:

using (oracleconnection oraconn = new oracleconnection(connstr )) to create a connection}

Probably because the connectionstring is incorrect!

You can also use it in other ways!

XP can be used with Oracle 10G and upgraded to.

Sorry I can't help you, I didn't install it successfully. Later, it was loaded with 10g.