Adapter update.

Hello Group,

I have asked this question already on the NpgSql forum, but didn't get a
response so far. Sorry for cross posting, but want to check if any one had
any suggestions for my problem.

I am trying to do my updates through NpgsqlDataAdapter (I also tried with
Odbc driver with no luck) by passing in a Datatable with changes in it, this
would take forever to do the updates.

This is what I am doing, I am reading the data from SQL Server 2005 and
dumping to out to Postgresql 8.2 database.

using (SqlCommand cmd = new SqlCommand(t.SourceSelect, conn))
{
using (SqlDataReader r = cmd.ExecuteReader())
{
DataSet ds = new DataSet("postgis");
NpgsqlDataAdapter adp = new
NpgsqlDataAdapter(t.DestinationSelect, destConn);
NpgsqlCommandBuilder cmdBld = new
NpgsqlCommandBuilder(adp);
adp.Fill(ds, t.DestinationTable);
DataTable destTbl = ds.Tables[t.DestinationTable];

DataTable srcTblSchema = r.GetSchemaTable();
adp.FillSchema(ds, SchemaType.Mapped,
t.DestinationTable);

// My save method will check if the row exists or not
and would add or update accordingly to the datatable (destTbl). The whole
process
// of comparision is done under 2 mins on 60,000
records.
while (r.Read())
_save(r, srcTblSchema, destTbl, destConn);

r.Close();

// This is the where my application goes into lala land.
If I call this update in my while loop above, it took about two hours to
process
// the whole thing
adp.Update(destTbl);
}
}

I have around 60000 records. I also have a geometry field on my table.

I have couple of questions.

1) What do I do to speed up the process? Any database configuration changes,
connection properties, ....
2) When I call the adapter.update does NpgsqlDataAdapter checks to see if
the column value really changed or not? I believe SQLDataAdapter does this
validation before it actually writes to the database.

Any suggestions and comments are greatly appreciated. Right now I am in dead
waters and can't get it to work on large datasets.

Thank you all.

Regards,
Murali K. Maddali
UAI, Inc.
murali(dot)maddali(at)uai(dot)com <mailto:murali(dot)maddali(at)uai(dot)com>

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