Cannot connect to database after installing 10g

Question

Hello friends at www.oracle.com ,
after installing Oracle 10g, I am trying to use programs like SQL*Plus or Forms Builder. However, these programs are asking me for the host string, and:
- I cannot simply ignore this question, because I cannot connect without this information.
- But I don't know how I can configure a host string for local access.
- And I don't know if there's already a default host string for me to use after installing Oracle 10g, because I have no practice in database configuration, since I'm a developer.
Please help me.
Best regards,
Franklin Goncalves Jr.

Answer 1

Hi ,
Few pointers which may help you , but a small caveat all instructions pertaining to way we do internally in oracle , so there could be some mismatch at customer end , but more or less logic should be same , in case you can't any step revert back :
1. When Db asks you for connect string essentially it asks for the complete description of the db to connect including :
Db server machine name / ip - that can be resolved from your system if it's a remote server .
Username , Password ,
Db Instance Name - TnsAlias mentioned in TnsNames.ora .
Now there are few Env. variables that you need to set before running / starting an oracle db instance .
1. Oracle_Home - Essentially Oralce Installation directory .
2. Oracle_sid - unique identifier for Oracle Instance .
3. For OracleDb only set T_Work and TNS_ADMIN env. variables as %Oracle_Home%\work directory and place your Listener.ora file in that folder .
4. Make your initial parameter file init<Oracle_Sid>.ora in %Oracle_Home%\database -- default location .
5. Create Oracle Instance specific services to run on a Windows machine , essentially they will be two and default nomenclature is :
Oracle Service - OracleService<Oracle_Sid>
Listener Service - Oracle<oracle_sid>TnsListener
Now in %Oracle_Home%\bin directory you have couple have tools to help you in whole process including lsnrctl.exe , tnsping.exe , sqlplus.exe .
and onec you start oracle instance like this :
SQlPlus "/as sysdba" -- OS Authentication
--- Connected to Idle instance
Sql> startup --> this will take default parameter file
Check out dump location for log and trace files generated if enabled .
Now client setting :
1. This is the place where you need appropriate connect string with all components as mentioned above .
Check out any good site for exact syntax , but you need to make sure regarding client you are using for e.g:
ODP.Net , Java Driver etc .
For Client few important settings :
Execution directory should contain tnsnames.ora
Create T_WORK and TNS_ADMIN for execution directory .
check out for listener connectivity using :
tnsping <TnsAlias>
Imp -- Include all relevant stuff in System PATH for execution from anywhere .
Once it connects tehn you can use appropriate username / password for connecting with appropriate connection string .
Normally while installing oracle you would have set the username and password to be changed later .
or otherwise onec you log in as sysdba, you can create new username/password and give it sysdba permissions .
Also imp. thing for connecting from a remote system is having Sqlnet.ora authentication file in client's T_WORK and TNS_ADMIN .
I hope it helps upto some extent .
regards ,
Mrinal