Why I can't insert more than 100,000 rows in a script?(mysql+php)

[Bhupendra Chouhan]

Hi,

I'm having a script for inserting a number of rows into a mysql table.
it goes something like this

$i=0;
while ($i<300000)
{
$x=rand(1,58000);
echo "I'm inserting number $i - amount $x <br />";
$query="INSERT INTO sales (amount) values('$x')";
mysql_query($query) or die(mysql_error());
$i++;
}

The script works well , but the problem is that it has a limit of aprox 100,000 rows per call.
Why can't I insert more than 100,000 rows?Can somebody explain me?