Този код ми помогна, опитайте го:
using (OracleConnection conn = new OracleConnection())
{
OracleCommand comm = new OracleCommand();
comm.Connection = conn;
comm.FetchSize = comm.FetchSize * 16;
comm.CommandText = "select * from some_table";
try
{
conn.Open();
OracleDataAdapter adap = new OracleDataAdapter(comm);
System.Data.DataTable dt = new System.Data.DataTable();
adap.Fill(dt);
}
finally
{
conn.Close();
}
}
Трикът е в съответствие (опитайте стойности от 8 до 64, за да намерите най-доброто за вашия случай):
comm.FetchSize = comm.FetchSize * 16;
АКТУАЛИЗАЦИЯ:
Ето един подобрен код:
OracleConnection myConnection = new OracleConnection(myConnectionString);
OracleCommand myCommand = new OracleCommand(mySelectQuery, myConnection);
myConnection.Open();
using (OracleDataReader reader = myCommand.ExecuteReader(CommandBehavior.CloseConnection))
{
// here goes the trick
// lets get 1000 rows on each round trip
reader.FetchSize = reader.RowSize * 1000;
while (reader.Read())
{
// reads the records normally
}
}// close and dispose stuff here
От тук