Default SID

I have installed personal oracle on my system running NT. Can someone tell me what is the default SID [I want to connect to my DB as sqlplus scott/tiger@xxxxx, what is xxxxx]

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sbenyoConnect With a Mentor Commented:

First you have a mistake between TNS and SID.
SID is the database instance name and it identifies the specific processes and parameters file of an oralce database.

The SID is set by a shell commnad
In Windows environment, env variables like ORACLE_SID taken first from the set command (you can see all setting by opening cmd window and using set command with no parameters).
and if not found from the REGISTRY.

You can check the registry under
for the default setting of ORACLE_SID.

When installing Personal Oracle it asks you in the installation process if you want to install a default database.
If you did choose that, you have a database otherwise you will have to create one yourself.

The default database's SID is ORCL.

First check if you have installed the default database by checking the NT services:
Go the control panel. Choose services
You should see 2 services by the name of:

If you don't see them you have a problem with the default database installation and you should reinstall.

Now for the SqlPlus part:
The XXXXX you wrote in the SqlPlus command is a TNS name and not the SID.

TNS is a connection definition for a database.
To use TNS you have to check the following:

1) Start oracle listener:
   lsnrctl80 start

2) Add the TNS connection definition in the TNSNames.ora file or by using Net8 Easy Config utility.

3) Check the connection by using
   tnsping80 XXXX

By default, ORCL should be defined in the listener and tnsname so all you have to do is start the listener and check that you have a correct TNS is set and working.

If you want to connect to the database without defining any TNS,
use svrmgr80 (or svrmgrl). Remember to check that the ORACLE_SID is set correctly.

If you have any problems or need any more information just tell me.
Andrei RodionovCommented:

As far as I remember the default SID for Personal Oracle is :2 (or 2:?), i.e. you should use

sqlplus scott/tiger@2:

As sbenyo has pointed out, the default sid is ORCL. I use a personal Oracle 8.0.4 on my laptop and for a personal edition, you don't have to set any sid and don't even require the tns alias or service name to connect to the database. Just invoke the corresponding tool and give the username/password and you should be able to connect.
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Mark GeerlingsDatabase AdministratorCommented:
On many platforms if you are running SQL*Plus on the same machine that the database is on, you don't need an entry at all for the third line of the login prompt.  If you do need an entry on that line it is the TNS alias for the database, not the SID that is required.
ajaykshAuthor Commented:
Many thanx for the description. Actually I wanted to connect to the personal oracle on my notebook thru java oracle jdbc drivers.


Reffer to a previous question related to this subject: 

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