Data provider internal error(-3000) during DataAdapter.Fill

Question

I get this error sporadically.
From other messages on this forum, it seems others are having similar problems. It appears the Oracle staff
is still struggling to identify and fix (or did I miss a post?)
I hope the next release can include some more informative diagnostic error messages. (no judgment implied, just a suggestion).
But I need this to work, so I'm posting my
info as well in hopes it will help.
Sorry for the length, but I think all the detail may be needed to diagnose.
I have been using ODP.Net for weeks without trouble
until recently. I just added a CLOB field to my table yesterday, and
the problem started. I don't know whether that's cause or coincidence.
Possible workarounds I will try:
1) Explicit select of columns rather than select *
2) Retry once on failure after short delay
Below, I'm including the exception message from the ASP.Net page.
It occurs at the same spot in my code, but often
it works fine. Now, an hour later, I cannot repeat the problem.
I've edited the "Source Error" section to
provide more of the code, so you can see the full context.
I've also pasted the stored procedure called so you can see what that is about.
I need this to work, so feel free to contact me if you need further information
to diagnose this in order to fix it.
I go live on March 7, so if I don't get a fix soon and can't find
a workaround, I'll just make a lame error message like "Site is very busy, please try again".
Even though the site is NOT busy. But having them try again seems to work.
And I don't want to tell them why I'm asking them to try again <grin>.
I am thinking of putting a try/catch block and sleeping for a second and then trying one more
time in my code. I'll let you know if that is an effective work-around.
David Kreth Allen
University of Minnesota
Carlson School of Management
[email protected] remove XYZ to send emails
612-625-0386
<WebPageError>
Server Error in '/ScholarshipApplicationWeb' Application.
Data provider internal error(-3000)
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: Oracle.DataAccess.Client.OracleException: Data provider internal error(-3000)
Source Error:
     OracleCommand cmd = new OracleCommand();
     cmd.Connection = new OracleConnection(
          ApplicationEnvironment.current.database.OracleConnectionString);
     cmd.CommandType = CommandType.StoredProcedure;
     cmd.CommandText = "pkg_batch.get_details";
     cmd.Parameters.Add("batch_id",OracleDbType.Int32,
          batchId,ParameterDirection.Input);
     cmd.Parameters.Add("batchCursor",OracleDbType.RefCursor,
          DBNull.Value,ParameterDirection.Output);
     cmd.Parameters.Add("majorsCursor",OracleDbType.RefCursor,
          DBNull.Value,ParameterDirection.Output);
     cmd.Parameters.Add("detailCursor",OracleDbType.RefCursor,
          DBNull.Value,ParameterDirection.Output);
     OracleDataAdapter da = new OracleDataAdapter(cmd);
     DataSet ds = new DataSet("batches");
     da.Fill(ds);
     DataTable dt = ds.Tables[0];
     dt.TableName = "batch";
Source File: C:\Projects\ScholarshipSolution\ScholarshipLibrary\Data\ScholarshipApplicationBatch.cs Line: 329
Stack Trace:
[OracleException: Data provider internal error(-3000)]
Oracle.DataAccess.Client.OracleException.HandleErrorHelper(Int32 errCode, OracleConnection conn, IntPtr opsErrCtx, IntPtr opsSqlCtx, Object src, String procedure, String[] args)
Oracle.DataAccess.Client.OracleDataReader.NextResult() +1259
System.Data.Common.DbDataAdapter.FillNextResult(IDataReader dataReader) +98
System.Data.Common.DbDataAdapter.FillFromReader(Object data, String srcTable, IDataReader dataReader, Int32 startRecord, Int32 maxRecords, DataColumn parentChapterColumn, Object parentChapterValue) +261
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable, IDataReader dataReader, Int32 startRecord, Int32 maxRecords) +129
Oracle.DataAccess.Client.OracleDataAdapter.Fill(DataSet dataSet, String srcTable, IDataReader dataReader, Int32 startRecord, Int32 maxRecords) +516
Oracle.DataAccess.Client.OracleDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +290
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet) +38
CSOM.ScholarshipLibrary.Data.ScholarshipApplicationBatch.getDataById(Int32 batchId) in C:\Projects\ScholarshipSolution\ScholarshipLibrary\Data\ScholarshipApplicationBatch.cs:329
CSOM.ScholarshipLibrary.Data.ScholarshipApplicationBatch.GetById(Int32 batchId) in C:\Projects\ScholarshipSolution\ScholarshipLibrary\Data\ScholarshipApplicationBatch.cs:290
CSOM.ScholarshipApplicationWeb.BatchSummaryControl.Edit_Click(Object sender, CommandEventArgs e) in c:\inetpub\wwwroot\ScholarshipApplicationWeb\BatchSummaryControl.cs:68
System.Web.UI.WebControls.LinkButton.OnCommand(CommandEventArgs e) +110
System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +115
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +138
System.Web.UI.Page.ProcessRequestMain() +1244
Version Information: Microsoft .NET Framework Version:1.0.3705.288; ASP.NET Version:1.0.3705.288
</WebPageError>
<PackageBody>
PROCEDURE GET_DETAILS(
p_batch_id IN number,
batchCursor OUT pkg_batch.refcur,
majorsCursor OUT pkg_batch.refcur,
applicationsCursor OUT pkg_batch.refcur
IS
BEGIN
OPEN batchCursor FOR SELECT
* FROM scholarshipApplicationBatch
where scholarshipApplicationBatch_id = p_batch_id;
OPEN majorsCursor FOR SELECT
* FROM major_response
where batch_id = p_batch_id;
OPEN applicationsCursor FOR SELECT
* FROM schol_detail
where batch_id = p_batch_id;
END GET_DETAILS;
</PackageBody>

Answer 1

One workaround that seems to work is to retry in a loop.
Sample code is pasted below.
Obviously it may still fail, but less often.
I'll report any further changes that affect
the behavior in hopes it will assist the Oracle staff in
fixing it.
<CODE>
try
da.Fill(ds);
catch (OracleException excp)
     const int maxTrys = 5;
     int failureCount = 1;
     bool succeeded = false;
     for (int i = 0;i<maxTrys;i++)
          try
               System.Threading.Thread.Sleep(
                    TimeSpan.FromSeconds(1));
               ds.Clear();
               da.Fill(ds);
               i = maxTrys;
               succeeded = true;
          }//try
          catch
               failureCount ++;
     }//for
     errorHandler.Report(
          String.Format(
          "Failure in da.Fill in ScholAppBatch. " +
          " Failed {0} times. Finally Succeeded = {1}.",
                                        failureCount.ToString(),
     succeeded.ToString()),
          excp);
}//catch
</CODE>