I have ran into an interesting query performance problem that occurs
with both 4.3.7 and 5.0.1 against a MySQL 4.1 database. The test
program (attached below) works, but performance is extremely sloooow, a
perl version of the test program completes in less than 5 seconds with
80k records in table 1 and 138k records in table 2. The PHP program is
taking something like 1 to 2 seconds per record. This only seems to
occur when you have a query nested inside of another. My test program
attached uses mysqli, but mysql functions yield the same result. Any
ideas would be appreciated.
<?
$link = mysqli_connect("localhost","test","test","db");
$qry = "select a,b from table1";
$result = mysqli_query($link,$qry);
if (!$result) { echo mysql_error() . "\n"; }
while ($data = mysqli_fetch_array($result, MYSQLI_BOTH)) {
$sql = "select * from table2 where common=".$data[0];
$result2 = mysqli_query($link,$sql);
if (!$result2) { echo mysql_error() . "\n"; }
while ($data2 = mysqli_fetch_array($result2,MYSQLI_BOTH)) {
$linenum++;
}
mysqli_free_result($result2);
}
mysqli_free_result($result);
mysqli_close($link);
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
