Profiling the performance of a few queries (based on the following discussion: http://www.freestuff.gr/forums/viewtopic.php?t=68286)
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<?php | |
set_time_limit(0); | |
$db_host = ''; //Database hostname | |
$db_username = ''; //Database username | |
$db_password = ''; //Database password | |
$db_name = ''; //Database name | |
$db_table_name = ''; //Database table name | |
function create_table() { | |
$st = $GLOBALS['pdo']->prepare("CREATE TABLE IF NOT EXISTS `{$GLOBALS['db_table_name']}` ( | |
`id` int(10) NOT NULL AUTO_INCREMENT, | |
`title` varchar(100) NOT NULL, | |
`value` int(10) NOT NULL, | |
PRIMARY KEY (`id`) | |
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;"); | |
$st->execute(); | |
} | |
function fill_with_data($rows_count, $max_value) { | |
$st = $GLOBALS['pdo']->prepare("INSERT INTO {$GLOBALS['db_table_name']} (`title`, `value`) VALUES (:title, :value)"); | |
$st->bindParam(':title', $title); | |
$st->bindParam(':value', $value); | |
for($i=0; $i < $rows_count; $i++) { | |
$title = "title $i"; | |
$value = rand(0, $max_value); | |
$st->execute(); | |
} | |
} | |
function enable_profiling() { | |
$st = $GLOBALS['pdo']->prepare("set profiling=1"); | |
$st->execute(); | |
} | |
function disable_profiling() { | |
$st = $GLOBALS['pdo']->prepare("set profiling=0"); | |
$st->execute(); | |
} | |
function select_max() { | |
$st = $GLOBALS['pdo']->prepare("SELECT MAX(`value`) as `max` FROM {$GLOBALS['db_table_name']}"); | |
$st->execute(); | |
} | |
function select_count() { | |
$st = $GLOBALS['pdo']->prepare("SELECT COUNT(*) FROM {$GLOBALS['db_table_name']}"); | |
$st->execute(); | |
} | |
function select_max_count() { | |
$st = $GLOBALS['pdo']->prepare("SELECT MAX(`value`) as `max`, COUNT(*) FROM {$GLOBALS['db_table_name']}"); | |
$st->execute(); | |
} | |
function select_order_by() { | |
$st = $GLOBALS['pdo']->prepare("SELECT `value` FROM {$GLOBALS['db_table_name']} ORDER BY `value` DESC"); | |
$st->execute(); | |
} | |
function select_all_order_by() { | |
$st = $GLOBALS['pdo']->prepare("SELECT * FROM {$GLOBALS['db_table_name']} ORDER BY `value` DESC"); | |
$st->execute(); | |
} | |
function show_profiles() { | |
$st = $GLOBALS['pdo']->prepare("SHOW PROFILES"); | |
$st->execute(); | |
while($row = $st->fetch()) { | |
echo "Query: $row->Query <br />"; | |
echo "Duration: $row->Duration <br /><br />"; | |
} | |
} | |
try { | |
$pdo = new PDO("mysql:host=$db_host;dbname=$db_name", $db_username, $db_password); | |
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); | |
$pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_OBJ); | |
//create_table(); | |
//fill_with_data(10000, 1000); | |
enable_profiling(); | |
select_max(); | |
select_count(); | |
select_max_count(); | |
select_order_by(); | |
select_all_order_by(); | |
show_profiles(); | |
disable_profiling(); | |
} catch(PDOException $e) { | |
echo $e->getMessage(); | |
} |
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