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    <p>I think you're on the right track with a C# console application to make it a repeatable process. <a href="http://dotnetzip.codeplex.com/" rel="nofollow noreferrer">Here</a> is great free library I've used for zip on many projects. </p> <pre><code>using (var client = new WebClient()) using (var stream = client.OpenRead(@"ftp://mysite.com/mydb.zip")) using (var file = File.Create(@"c:\temp\mydb.zip")) { stream.CopyTo(@"c:\temp\mydb.zip", 32000); } using (ZipFile zip = ZipFile.Read(@"c:\temp\mydb.zip")) { ZipEntry e = zip["bigdb.mdb"]; e.Password = "yourpassword"; e.Extract("c:\temp\bigdb.mdb"); } </code></pre> <p>Once unpacked, you can create a data connection to the access DB and datareader object. Then use the dbreader to read rows and write to flat file (avoids out of memory exception with large data sets).</p> <pre><code>private constr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=yourdbfile.mdb;Jet OLEDB:Database Password=yourpassword;"; OleDbConnection conn = new OleDbConnection(constr); string query = "SELECT * FROM [YourTable]"; OleDbCommand cmd = new OleDbCommand(query, conn); OleDbDataReader reader = cmd.ExecuteReader(); int rowNum = 0; StringBuilder sb = new StringBuilder(); while (reader.Read()) { // write rows to flat file in chunks of 10K rows. sb.Append(reader["FieldA"].ToString() + "|"); sb.Append(reader["FieldB"].ToString() + "|"); sb.Append(reader["FieldC"].ToString() + System.Environment.NewLine); if (rowNum % 10000 == 0) { File.AppendText(@"c:\temp\data.psv", sb.ToString()); sb = new StringBuilder(); } rowNum++; } File.AppendText(@"c:\temp\data.psv", sb.ToString()); reader.Close(); </code></pre> <p>After you have your data table filled you can then export it to a flat file. <strong>I would not suggest inserting data row by row, that will be incredibly slow and it will bloat your Oracle db transaction logs.</strong> I don't believe Oracle 10g has a .Net driver that supports bulk loading, so you'll probably need to bulk load via a flat file.</p> <p>Next, import into Oracle via command line, <a href="https://stackoverflow.com/questions/206323/how-to-execute-command-line-in-c-get-std-out-results">you can invoke this from your C# console app</a>. Before you do this you'll need to have created a <a href="http://docs.oracle.com/cd/B10501_01/server.920/a96652/ch05.htm" rel="nofollow noreferrer">control file, ctl.ldr</a>, first which is used by Oracle for bulk load operations.</p> <pre><code>options (skip=1) load data INFILE 'c:\temp\data.psv' INTO table tblTest APPEND FIELDS TERMINATED BY "|" optionally enclosed by '"' ( fielda,fieldb,etc...) and then run it in as follows via command line sqlldr username/pswd@oracle_sid control=ctl.ldr </code></pre> <p>Hopefully this helps, good luck!</p> <p><strong>[Edit]</strong></p> <p>You might also have a look at the .Net <a href="http://docs.oracle.com/cd/E11882_01/win.112/e18754/OracleBulkCopyClass.htm" rel="nofollow noreferrer">Oracle Bulk copy class</a>. This was shipped with the Oracle 11g <strong>client</strong> drivers. Perhaps it will still work against your 10g server. A potential problem there, is that all your other apps on that same application server would need to work with these newer 11g client drivers too. Another option is to build a Java application that uses the <a href="http://docs.oracle.com/cd/E18283_01/appdev.112/e11828/sem_jena.htm" rel="nofollow noreferrer">Jena framework</a> which supports bulk loading.</p>
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    1. COI think `a.Fill(t1)`;would throw an `OutOfMemoryException`, I have used it before with a fill with 250k records and failed, this access file weights 1.5GB could be millions of records, the other way of oracle seems very reasonable, let me take a look of that, thanks for your effort
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    2. COGood point, you don't need to use a datatable, you can use a datareader and read the rows in a streaming manner, it just takes more code.
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    3. COthanks!, remember is an FTP, but thanks for your recommendation of the WebClient, i think would be using ftwebrequest
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