Don"t get all records from SQL-table

Hi!

Following script stops after a while (appr. 1 minute) without an error-
message:

// Loop 12 Times:
$conn=odbc_connect("database1","","");
$sql="SELECT * FROM Table1 WHERE id>0";
$result = odbc_exec($conn, $sql);
$i=1;
while (odbc_fetch_row($result, $i)){
// --- Creating table for display ---
$i++;
};

With reading 3000 records, looping 12 times. With the loop ~ 1 to 3
times the script works.

Is there any timeout-problem (session- and script-timeout are set to
1000)?

Regards
LK