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Internal .Net Framework Data Provider Error 30

Exception: Internal .Net Framework Data Provider Error 30 Occurrence : On command execution with Oracle client, .NET 4.0, Oracle DB 11 SQL Command contains inline invoked PL/SQL Exceptions (RAISE) Solution : SQL > set serveroutput on buffer 2560000
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Could not load file or assembly 'Oracle.DataAccess' or one of its dependencies. An attempt was made to load a program with an incorrect format. On 64-bits

Solution: Install both Oracle client versions in fallowing order: 64 Bit 32 Bit Enable 32-Bit Application in IIS 7 ( more ) Set target platform to x86 in Build properties Exception: Could not load file or assembly 'Oracle.DataAccess' or one of its dependencies.
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System.InvalidOperationException: Attempt to load Oracle client libraries threw BadImageFormatException. This problem will occur when running in 64 bit mode with the 32 bit Oracle client components installed

Issue : Cant connect to oracle DB by default oracle client Solution : Download and install 64-bit ODAC for Windows x64 (old Oracle client version must be uninstalled) URL : http://www.oracle.com/technetwork/database/windows/downloads/index-090165.html
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ORA-12712 on NLS_CHARACTERSET changing from EE8MSWIN1250 to AL32UTF8

I tried to change character set in my oracle database because of Russian localization, I tried command: ALTER DATABASE CHARACTER SET AL32UTF8; i got this error: ORA-12712: new character set must be a superset of old character set After some googling I
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ora-12154 tns could not resolve the connect identifier specified

Issue : Cant connect from Visual Studio to Oracle DB on Windows 64 bit system Solution : Move Visual Studio from Program Files (x86) to Program Files folder Reason : Oracle driver doesn't accept parenthesis in working path Přidej do linkuj.cz! | jagg.cz!
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