I am new to Databases and .net!
I have SQL developer 3.0 installed through which I can connect to the Oracle 11g Database server.
The requirement is to write a C# program to connect to the oracle database and run query; in my visual studio 2013 project I have added a reference to Oracle.DataAccess.Client and written the code, however while debugging an error occurs that says "Ora-12541:TNS:No-Listener".
My question for now is, Do I need to install an Oracle client (64-bit ODAC 11.2 Release 6 (11.2.0.4.0) Xcopy for Windows x64 ?), my assumption was SQL developer will take care of this!
Please help!
SQL Developer has it's own Oracle drivers (JDBC as far as I know), thus you must install Oracle Client in order to connect to an Oracle DB in Visual Studio.
Note, "ODAC" contains only the ODP.NET Data Provider (i.e. mainly the Oracle.DataAccess.dll file). In order to use it, you must install the actual Oracle Client - at least the Instant Client (which is also included in the ODAC Download file).
Consider to use the ODP.NET Managed Driver, then you need only one single DLL, nothing else. It can be downloaded from Oracle page 64-bit Oracle Data Access Components (ODAC) Downloads and works for both 32bit and 64bit applications.
Unless you copied Oracle.DataAccess.dll from another machine, all oracle packages that include it, also include some version of the client. ODAC includes the full version while the xcopy installs have the instant client. I'll also point to the managed provider though for simplicity as it does not have any unmanaged dependencies,
However, if you got all the way to an "ora-xxxxx" error, it sounds like your Oracle client is correctly installed. The only issue you have now is your connection string. If you normally use a TNS name in Sql Developer, than you either need to copy your existing tnsnames.ora to network/admin in your new oracle home dir, or you need to set a TNS_ADMIN system environment variable to point to your existing one. There are other options too, but your error in this case is tns specific.
Related
We have an issue related to connecting the Oracle database 19 c / 12c from one of the Windows 2016 machine build from AWS
The exception we are getting is "The provider is not compatible with the version of Oracle client"
Our application is using Oracle.DataAccess.dll to connect the oracle database. Along with the application build we have added these below binaries so that customers are not required to install the ODAC explicitly
oraociei12.dll
oci.dll
oraons.dll
OraOps12.dll
Our application is running in most of the Windows machine(s) and also with freshly build machine from AWS.
Expect for one of the particular Windows Machine they call as Production, there we are facing an issue. We tried all the possible solution provided in the Stackoverflow and others site, Tries are like
Installing the ODAC explicitly
Checking with GAC
Adding the environment variable
And other possible ways suggested over the net.
Can anybody help here what I am missing here?
Currently we have Oracle Client installed on our server VMs but we'd like to use Oracle Instant Client on Azure Service Fabric (without installation). I managed to get it work with version 11 but with v12 I'm still getting below error (far from connecting to database):
"The type initializer for 'Oracle.DataAccess.Client.OracleParameter'
threw an exception: The provider is not comatibile with the version of
Oracle client"
Again: it works without installation with Oracle.DataAccess.dll 4.112.3.0 and Instant Client 11.2.0.3 (both x32) but still can't get it to communicate with the newest versions.
I've worked with several Instant Client how-to articles but all of them are very old (~2013) with inactive links to Oracle downloads... Also I cannot use System.Data.OracleClient Namespace because it lacks a few functionalities we need (fe XxmlType or custom types) so I need to reference Oracle.DataAccess.dll
Here are steps I tried. Please point me what am I doing wrong...
Downloaded and installed OracleClient 12.1.0.1.0 (Oracle.DataAccess.dll v4.121.1.0) - ODAC122010_x64
Copied Oracle.DataAccess.dll from Oracle Home directory (whre it is installed) \odp.net\bin\4 to my project and referenced it
Downloaded Instant Client from Oracle website. Version 12.1.0.1.0 - same as Oracle.DataAccess.dll
Added Instant Client dlls to project (Copy local: Always)
Also I set up Environment like this:
Environment.CurrentDirectory = AppDomain.CurrentDomain.BaseDirectory;
Works locally (where Oracle is installed) but shows exception when published on Azure
I have a asp.net mvc application which is using oracle 11g database. In development machine every thing worked fine, but while deploying it in production server asp.net application is not able to connect to the database server. It is always throwing an empty exception.
I wrote also a simple console application to test the db connectivity. It is also not working. Then I realized it is because that the machine doesn't have a oracle client installed. so I installed Oracle instant client for 11g database 32 bit version. After this the console application started working but the web application still could not connect.
I google lot and finally decided to analyse using process monitor. In process monitor I found that the web application (iis) is looking for an oraclient12.dll.
This oraclient12.dll is part of oracle client for 12c database. I can't understand why it is looking for this dll.
After installing oracle database client for 12g, the above issue with oraclient12.dll got fixed. but iis is now not able to locate oraclsce12.dll.
I searched the whole file-system for this file but could not find.
does anyone know what should i install to get oraclsce12.dll.
Thanks,
Sujith
I was facing similar issue, then came to know that for the dll to be installed you should now also install the option «Oracle Advanced Security»,, by choosing custom installation when installing the oracle 12 client. I did the same and my issue got resolved. You can try this and see if your issue gets resolved.
thanks Sudharsan
This is documented as Oracle bug 17379890.
Oracle provides two workarounds:
Workarounds include:
To avoid the issue in the first place, explicitly select "Oracle NET" component during install
After the fact, you can
do another custom install into the same home, and select "Oracle NET"
copying ORACLSCE12.DLL from an existing install into OH\bin also resolves the issue.
However, making a single copy of file ORACLSCE12.DLL is not sufficient because there are more files which are missing. The workaround works only for certain applications. For example for tnsping.exe you still get an error due to missing files.
You have to take the first solution, i.e. explicitly select "Oracle NET" component during install
I have C# and Oracle 10g installed on my workstation.And also created a C# program,so my problem is i cant connent my C# application with Oracle database.it is really freaking me out.when adding Reference i cant find "Oracle.DataAccess.dll".thnx in advance.#Amu
Have you installed ODAC (oracle client) components on you workstation?
If you would use Oracle.Data namespace You need them. You can download from here
Please chek database version and bitness, because it is an important factor.
If you dont want to install Oracle client, you could try to use System.Data.OracleClient namespace, that's bundled with framework. In this case take in account that's deprecated and will be removed on next version of framework (link)
I have a WebService developed in .NET which connects to an Oracle Database. To do that I use the ODAC which Oracle Provides.
But every time I need to install my application on the Client Machines, I have so much trouble regarding the "Oracle Client", depending on if he already has an Oracle Client installed that is not the same version, or if he has one with a different platform (32bit, 64 bit), or anything else.
The point is I spend too much time trying to fix that thing every time.
Is there a way I can configure my application that I can install it, and it has everything it needs. And I don't need to worry about what the server has installed or what will be installed on it. Is there a way?
ODP.NET is distributable and multiple versions can be installed on one machine. You can include it with your app and that will minimize versioning issues.
It sounds like you are currently using the unmanaged ODP.NET driver. If so, have a look at the XCopy install. You can look at how the scripts work and include them in your own install.
If you can use the Fully Managed ODP.NET that will mostly eliminate the 32-bit vs 64-bit issue (unless you are using distributed transactions). And it is only 10 MB.
http://www.oracle.com/technetwork/topics/dotnet/whatsnew/index-101716.html
Maybe you can check out the Oracle Instant Client?
Oracle Instant Client
The Basic download contains all files needed if you're only wanting to connect to the db from your .Net app. I have used this a lot in the past. Simple install, too.