XE :: 11g - Can't Connect To Database After Installation
Jan 31, 2013
I recently installed Oracle database 11g XE onto my home computer running Windows 32 bit, but I can't connect to the database. I also have Oracle 10g R2 installed on my computer, and I can still connect to it finely. When trying to make a connection in SQL DEVELOPER, I get this error
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
I tried to tnsping the XE database and it returns successfully.
C:>tnsping xe
TNS Ping Utility for 32-bit Windows: Version 11.2.0.2.0 - Production on 31-JAN-2
013 07:59:17
Copyright (c) 1997, 2010, Oracle. All rights reserved.
Used parameter files:
C:oraclexeapporacleproduct11.2.0server
etworkadminsqlnet.ora
Acer laptop, Intel Processor w/ Windows 7 Professional (64-bit) Delphi 2010 Professional Oracle XE (+ the Oracle XE client that comes with it)
I cannot can't to the Oracle database from Delphi. The error I keep getting is:
Alias is not currently opened. [Oracle][ODBC][Ora]ORA-12154:TNS: could not resolve the connet identifier specified.
Here's what I've done:
1. Create an ODBC connection to my Oracle database
- run C:WindowsSysWOW64odbcad32.exe to open the ODBC administrator. - Data source name: bt_user - TNS Server Name: localhost/xe - user bt_user - Clicked "test connection" -- Success.
2. Open Delphi and drop a TDatabase component on my main form.
- Set the Alias Name property to "bt_user" (the alias I set up in ODBC) - Set database name to "bt_user". - Checked "connected".
Alternatively, I tried using the Delphi ADO components (the dbGo components).
- Drop TADOConnection component on my form. - Select "connection string" and open the dialog. - Click "build string". - Select "Microsoft OLE DB Provider for ODBC Drivers" from the selection. - In "use data source", select "bt_user" from the drop-down list (my ODBC connection from #1) - Click "test connection".
Again the same error.
My questions are:
1. Can Delphi work with Oracle XE (Express Edition)?
2. If so, then do I need to install the "Instant Client"?
3. Will the instant client for Oracle 10g work with Oracle 10g XE?
4. Do I need to install any additional ODBC driver(s)?
5. Why was I successful in creating the ODBC connection in Windows, but it failed in Delphi?
6. Will Visual Studio.NET (C#) work with Oracle XE, and what are the steps for setting that up?
My question is; I've been reading the Oracle database 11g R2 documentation at this link [URL]...
I passed a couple of days learning about all installation configuration parts including the desktop class and server class.As I was learning, So I had already downloaded Oracle Database Express 11g R2 for win32.
So as i had finished the installation guide I thought it's time to install the oracle now. I did it, and what I found was that there was not any option during installation that i read in above documentation. While trying to find about this difference i reached on documentation[URL]...
That is for express version only.
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The Assistant is unable to create or upgrade the Oracle Schema for the following reason:
ConfigException: Could not upgrade the Oracle Schema: oracle.net.config.ConfigException: TNS-004409 Directory Service Errorcaused by: oracle.net.config.DirectoryServiceException: TNS - 04431: DirectoryService: no entries foundcaused by: oracle.net.ldap.NNFLException.You may need to upgrade the directory schema from a specific computer which directly supports your directory type.
Command Line Error Response ConfigException: Could not check for the Oracle Schema: oracle.net.config.Config Exception: TNS-04409: Directory service error caused by: oracle.net.config.DirectoryServiceException: TNS-04431: DirectorySe rvice: no entries found caused by: oracle.net.ldap.NNFLException
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Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521))) STATUS of the LISTENER Alias LISTENER Version TNSLSNR for 32-bit Windows: Version 11.2.0.1.0 - Prod ction Start Date 21-NOV-2012 20:28:48 Uptime 0 days 0 hr. 27 min. 32 sec Trace Level off [code].....
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