Random error

Discussion of open issues, suggestions and bugs regarding usage of dbExpress drivers for InterBase & Firebird in Delphi and C++Builder
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Joined: Tue 11 Aug 2015 17:54

Random error

Post by rogerrodrigues » Tue 11 Aug 2015 17:56


I have a 32bit Delphi 7 application running on a Windows Server 2008 (x64) with Firebird (x64).

The Firebird 2.5 has 3 major settings: Super Server, Classic Server and Super Classic Server.

Using the Devart dbExpress driver and Super Server setting, the app randomly crashes with the error: "invalid transaction handle (expecting explicit transaction start)".
With the Super Classic server setting, the app randomly crashes with the error: "Sql Server Error: Access Violation at address 10011CFE4 in module 'fbclient.dll'. Read of address 00000020".
And with Classic Server, everything looks fine so far.

Before I upgrade to the Devart dbExpress driver, the app was running with the UIB 1.5 driver without any problem in the 3 settings.

Could you help me finding the error? Because the best setting that suits for me is the Super Classic Server.

The Devart dbExpress version is


Devart Team
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Re: Random error

Post by ViktorV » Wed 12 Aug 2015 08:18

To investigate this behavior of dbExpress driver for InterBase and Firebird, please compose a small sample demonstrating the problem and send it to viktorv*devart*com, including scripts for creating database objects.

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