Use of ODP and casual application freeze-up

Question

Hello,
I'm writing a small application which connects to MS SQL 2000 and Oracle 10.2.0.1.0 and transports data between them.
When it comes to biggest table which is called CLANKY, there is 11892 records with clob columns and fulltext index over it.
But during the transfer often happen that application stops on OracleCommand.ExecuteNonQuery() and will not continue again. There is no specification of situation when it happen. It can happen on command which inserts, or on command launching stored procedure which retrieves ID of last inserted record through a trigger code which is storing it in variable. Sometimes it doesn't happen during transfer of CLANKY table, but most often there. Sometimes the application ends properly.
I've tried lot of things to make sure I'm doing everything right, but nothing help. I was closing and disposing all OracleCommands but it make it (subjectively) worse. I don't think that I'm doing something so complicated.
In memory I'm holding only Dictionary<int,int> of remapped ids.
Here is the code for transfering CLANKY table.
private bool transferTableClanky(SqlConnection sqlSource, OracleConnection oracleTarget, Dictionary<int, int> autoriMap, Dictionary<int, int> jiniAutoriMap, Dictionary<int, int> zdrojeMap, Dictionary<int, int> clankyMap)
oracleTarget.Close();
oracleTarget.Open();
SqlCommand command = new SqlCommand
("SELECT id_clanku, nazev, popisek, clanek, datum_vlozeni, datum_zmeny, je_odkaz, odkaz, id_autora, "
+ "zobrazit_jineho_autora, id_jineho_autora, zobrazit_zdroj, id_zdroje, obr_nahled, obr_nahled_text, "
+ "ts FROM clanky;"
, sqlSource);
SqlDataReader reader = command.ExecuteReader();
log("Start:" + DateTime.Now.ToString());
int count = 0;
while (reader.Read())
count++;
int id_clanku = reader.GetInt32(0);
string nazev = reader.GetString(1);
string popisek = "";
if (!reader.IsDBNull(2))
popisek = reader.GetString(2);
string clanek = "";
if (!reader.IsDBNull(3))
clanek = reader.GetString(3);
DateTime datum_vlozeni = reader.GetDateTime(4);
DateTime datum_zmeny = reader.GetDateTime(5);
bool je_odkaz = reader.GetBoolean(6);
string odkaz = reader.GetString(7);
int id_autora = -1;
if (!reader.IsDBNull(8))
id_autora = reader.GetInt32(8);
id_autora = autoriMap[id_autora];
bool zobrazit_jineho_autora = reader.GetBoolean(9);
int id_jineho_autora = -1;
if (!reader.IsDBNull(10))
id_jineho_autora = reader.GetInt32(10);
id_jineho_autora = jiniAutoriMap[id_jineho_autora];
bool zobrazit_zdroj = reader.GetBoolean(11);
int id_zdroje = -1;
if (!reader.IsDBNull(12))
id_zdroje = reader.GetInt32(12);
id_zdroje = zdrojeMap[id_zdroje];
string obr_nahled = reader.GetString(13);
string obr_nahled_text = reader.GetString(14);
int ts = -1;
if (!reader.IsDBNull(15))
ts = reader.GetBoolean(15) ? 1 : 0;
OracleCommand oraCmd = new OracleCommand(
"INSERT INTO clanky(nazev, popisek, clanek, datum_vlozeni, datum_zmeny, je_odkaz, odkaz, id_autora, "
+ "zobrazit_jineho_autora, id_jineho_autora, zobrazit_zdroj, id_zdroje, obr_nahled, obr_nahled_text, "
+ "ts) "
+ "VALUES (:nazev, :popisek, :clanek, :datum_vlozeni, :datum_zmeny, :je_odkaz, :odkaz, :id_autora, "
+ ":zobrazit_jineho_autora, :id_jineho_autora, :zobrazit_zdroj, :id_zdroje, :obr_nahled, :obr_nahled_text, "
+ ":ts)", oracleTarget);
oraCmd.Parameters.Add("nazev", OracleDbType.Varchar2, nazev, ParameterDirection.Input);
oraCmd.Parameters.Add("popisek", OracleDbType.Varchar2, popisek, ParameterDirection.Input);
OracleClob oraClob = new OracleClob(oracleTarget);
char[] clanekArr = clanek.ToCharArray();
oraClob.Write(clanekArr, 0, clanekArr.Length);
oraCmd.Parameters.Add("clanek", OracleDbType.Clob, oraClob, ParameterDirection.Input);
oraCmd.Parameters.Add("datum_vlozeni", OracleDbType.Date, new OracleDate(datum_vlozeni), ParameterDirection.Input);
oraCmd.Parameters.Add("datum_zmeny", OracleDbType.Date, new OracleDate(datum_zmeny), ParameterDirection.Input);
oraCmd.Parameters.Add("je_odkaz", OracleDbType.Decimal, new OracleDecimal(je_odkaz ? 1 : 0), ParameterDirection.Input);
oraCmd.Parameters.Add("odkaz", OracleDbType.Varchar2, odkaz, ParameterDirection.Input);
if (id_autora == -1)
oraCmd.Parameters.Add("id_autora", OracleDbType.Decimal, null, ParameterDirection.Input);
else
oraCmd.Parameters.Add("id_autora", OracleDbType.Decimal, new OracleDecimal(id_autora), ParameterDirection.Input);
oraCmd.Parameters.Add("zobrazit_jineho_autora", OracleDbType.Decimal, new OracleDecimal(zobrazit_jineho_autora ? 1 : 0), ParameterDirection.Input);
if (id_jineho_autora == -1)
oraCmd.Parameters.Add("id_jineho_autora", OracleDbType.Decimal, null, ParameterDirection.Input);
else
oraCmd.Parameters.Add("id_jineho_autora", OracleDbType.Decimal, new OracleDecimal(id_jineho_autora), ParameterDirection.Input);
oraCmd.Parameters.Add("zobrazit_zdroj", OracleDbType.Decimal, new OracleDecimal(zobrazit_zdroj ? 1 : 0), ParameterDirection.Input);
if (id_zdroje == -1)
oraCmd.Parameters.Add("id_zdroje", OracleDbType.Decimal, null, ParameterDirection.Input);
else
oraCmd.Parameters.Add("id_zdroje", OracleDbType.Decimal, new OracleDecimal(id_zdroje), ParameterDirection.Input);
oraCmd.Parameters.Add("obr_nahled", OracleDbType.Varchar2, obr_nahled, ParameterDirection.Input);
oraCmd.Parameters.Add("obr_nahled_text", OracleDbType.Varchar2, obr_nahled_text, ParameterDirection.Input);
if (ts == -1)
oraCmd.Parameters.Add("ts", OracleDbType.Decimal, null, ParameterDirection.Input);
else
oraCmd.Parameters.Add("ts", OracleDbType.Decimal, new OracleDecimal(ts), ParameterDirection.Input);
oraCmd.ExecuteNonQuery();
clankyMap[id_clanku] = getIdentity(oracleTarget);
this.tickCallback();
oraCmd.Dispose();
reader.Close();
log("End with " + count + " of records:" + DateTime.Now.ToString());
return true;
}

Answer 1

I think it's caused by Oracle.DataAccess connectors. I've used a System.Data.OracleClient connector by Microsoft and it works well. And the code is doing the same INSERT and stored procedure call.
What exactly do you mean with tracing the session? Dou you think it's locked-up on the database side? :o