Category Archives: Oracle

And While I’m Asking For Things

Speaking of requests, I have another quick one. My department has used the Oracle.ManagedDataAccess.dll for quite a while now in our C# (i.e., .NET) deployments, and even though we’ve had some performance issues at times, we’ve created some workarounds and eventually achieved harmony with this miscreant spawn of Oracle (who has been known to be developer-unfriendly). However, we came across a new one the other day:

Value cannot be null.
Parameter name: byteArray
Server stack trace:
at System.BitConverter.ToString(Byte[] value, Int32 startIndex, Int32 length)
at OracleInternal.TTC.TTCLob.GetLobIdString(Byte[] lobLocator)
at OracleInternal.ServiceObjects.OracleDataReaderImpl.CollectTempLOBsToBeFreed(Int32 rowNumber)
at Oracle.ManagedDataAccess.Client.OracleDataReader.ProcessAnyTempLOBs(Int32 rowNumber)
at Oracle.ManagedDataAccess.Client.OracleDataReader.Read()

Basically, if you have a null value in the CLOB column of an Oracle table, you might get this error when you attempt to access that row in the result set. After trying the most recent version of the library (as recommended by Oracle), it became obvious that they still haven’t fixed it. Strangely, the error seems to occur randomly, since it won’t always happen when running the executable against the same data. After spending some time in an effort to diagnose the error, I eventually capitulated, accepted Oracle’s foibles, and simply set all CLOB columns to EMPTY_CLOB(). Problem solved.

But for posterity and all those after me, I implore you, Oracle: can you address this simple problem in your library? I’d ask you to open-source that library, but we all know that’s not gonna happen. So, please go ahead and fix the bug for us. It’d probably take you a whole 15 minutes, the same amount of time that Ellison needs to check the rigging on one of his catamarans. We’d all appreciate it!

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