[英]PHP / MySQL is slow, can't figure out why?
即使正在輪詢兩個節目,第一個函數recentlyModified()
也會在1秒內准確運行。 我承認,它需要處理的參數要少得多,但是每場演出大約要0.5秒,因此速度很快。
但是,第二個函數myList()
對於4個標題大約在16秒內運行,對於2個標題,大約11秒運行,對於一個標題,則6秒運行。 當然,這是平均水平。
<?php
include_once './php/loadanime.php';
function crunchyrollNews() {
echo('<iframe class="rss fullwidth fullheight" src="http://feeds.feedburner.com/crunchyroll/animenews?format=xml"></iframe>');
}
function recentlyModified($count) {
$mtime = microtime();
$mtime = explode(" ",$mtime);
$mtime = $mtime[1] + $mtime[0];
$starttime = $mtime;
$animedb = new mysqli("localhost", "animedeck", "W8a7fs5gu");
$query = $animedb->query("SELECT id, img, name, description FROM animedeck.animelist ORDER BY modified DESC LIMIT " . $count . "");
if($query) {
$result = $query->fetch_all();
echo '<div class="recentanimemodule">';
echo '<h1 class="h1 borderb">AnimeDeck Recent</h1>';
foreach($result as $id) {
echo '<div class="recentanimepiece">';
echo '<img class="recentanimeposter" src="';
echo $id[1];
echo '" />';
echo '<a class="recentanimeurl" href="'; //a href start
echo './viewanime.php?id=' . $id[0];
echo '">';
echo '<div class="recentanimename">';
echo $id[2];
echo '</div>';
echo '</a>'; //a href end
echo '<div class="recentanimedes">';
echo $id[3];
echo '</div>';
echo '</div>';
}
echo '</div>';
} else {
echo "Failed to retrieve entries.";
}
$mtime = microtime();
$mtime = explode(" ",$mtime);
$mtime = $mtime[1] + $mtime[0];
$endtime = $mtime;
$totaltime = ($endtime - $starttime);
echo "This module was created in ".$totaltime." seconds";
}
function myList($status, $sort, $startindex, $count) {
$mtime = microtime();
$mtime = explode(" ",$mtime);
$mtime = $mtime[1] + $mtime[0];
$starttime = $mtime;
$animedb = new mysqli("localhost", "animedeck", "W8a7fs5gu");
$orderby;
$title = "Recent";
$rstatus = ", status='" . $status . "'";
if($status == "all") {
$rstatus = null;
}
if($startindex == null) {
$startindex = 0;
}
switch ($sort) {
case "recent":
$sort = "DESC";
$orderby="modified";
$title = "Recent";
break;
case "oldest":
$sort = "ASC";
$orderby="modified";
$title = "Oldest";
break;
case "az":
$sort = "ASC";
$orderby="animename";
$title = "A to Z";
break;
case "za":
$sort = "DESC";
$orderby="animename";
$title = "Z to A";
break;
}
$query = $animedb->query("SELECT animeid FROM animedeck.mylist WHERE userid='" . $_SESSION['userid'] . "' " . $rstatus . " ORDER BY " . $orderby . " " . $sort . " LIMIT " . $startindex . ", " . $count . "");
if($query) {
$result = $query->fetch_all();
echo '<div class="myanimemodule">';
echo '<h1 class="h1 borderb">MyList ' . $title . '</h1>';
foreach($result as $id) {
$info = loadSemiAnime($id[0]);
echo '<div class="animeid">' . $id[0] . '</div>';
echo '<div class="myanimepiece">';
echo '<img class="myanimeposter" src="';
echo $info['img'];
echo '" />';
echo '<a class="myanimeurl" href="'; //a href start
echo './viewanime.php?id=' . $id[0];
echo '">';
echo '<div class="myanimename">';
echo $info['name'];
echo '</div>';
echo '</a>'; //a href end
echo '<div class="myanimedes">';
echo $info['description'];
echo '</div>';
echo '</div>';
echo '<div class="animelistoptions">';
echo '<span onClick="setStatus(' . $id[0] . ', \'';
echo loadAnime($id[0], "name") . "'";
echo ', 0)" id="stowatch' . $id[0] . '" class="bluebutton">To Watch</span>';
echo '<span onClick="setStatus(' . $id[0] . ', \'';
echo loadAnime($id[0], "name") . "'";
echo ', 1)" id="swatching' . $id[0] . '" class="bluebutton">Watching</span>';
echo '<span onClick="setStatus(' . $id[0] . ', \'';
echo loadAnime($id[0], "name") . "'";
echo ', 2)" id="swatched' . $id[0] . '" class="bluebutton">Seen</span>';
echo '<span onClick="setStatus(' . $id[0] . ', \'';
echo loadAnime($id[0], "name") . "'";
echo ', 3)" id="srewatching' . $id[0] . '" class="bluebutton">Re-Watching <i class="fa fa-heart"></i></span>';
echo '</div>';
echo '<script>getStatus(' . $id[0] . ');</script>';
}
echo '</div>';
} else {
echo "Failed to retrieve entries. Error: " . $animedb->errno . " --- " . $animedb->error;
}
$mtime = microtime();
$mtime = explode(" ",$mtime);
$mtime = $mtime[1] + $mtime[0];
$endtime = $mtime;
$totaltime = ($endtime - $starttime);
echo "This module was created in ".$totaltime." seconds";
}
?>
所以我的問題是我不確定代碼中的什么導致它花費這么長時間? 一次迭代需要6秒? 是PHP嗎? 我以為MySQL執行起來很快,所以我以為是PHP。 但是哪一部分呢?
我對PHP的優缺點不熟悉,所以我不知道什么真正在減慢我的功能。
這是我的loadAnime()和loadSemiAnime()函數:
<?php
function loadAnime($id, $toload) {
$animedb = new mysqli("localhost", "animedeck", "W8a7fs5gu");
$load = $animedb->query("SELECT " . $toload . " FROM animedeck.animelist WHERE id=" . $id . "");
if($load) {
$result = $load->fetch_assoc();
echo $result[$toload];
}
}
function loadSemiAnime($id) {
$animedb = new mysqli("localhost", "animedeck", "W8a7fs5gu");
$load = $animedb->query("SELECT img, name, description FROM animedeck.animelist WHERE id=" . $id . "");
if($load) {
$result = $load->fetch_assoc();
return $result;
}
}
?>
您的查詢是動態構建的,因此在那里很難看到任何內容,但是構建起來看起來很簡單,所以我懷疑查詢非常簡單。
但是,您具有連接到數據庫並對每個主查詢返回的記錄進行查詢的函數。 這些似乎沒有必要,因為您似乎可以執行JOIN來獲取主查詢中的字段:
SELECT a.animeid, b.img, b.name, b.description
FROM animedeck.mylist a
LEFT OUTER JOIN animedeck.animelist b
ON a.animeid = b.id
WHERE a.userid='" . $_SESSION['userid'] . "' " . $rstatus . " ORDER BY " . $orderby . " " . $sort . " LIMIT " . $startindex . ", " . $count . "
這也是問題所在。
$query = $animedb->query("SELECT animeid FROM animedeck.mylist WHERE userid='" . $_SESSION['userid'] . "' " . $rstatus . " ORDER BY " . $orderby . " " . $sort . " LIMIT " . $startindex . ", " . $count . "");
您的“ userid”在您的where子句中,在一個大表上,如果此字段不是索引,它將變得非常慢。 進入您的MySQL表並在此列中添加索引,例如。
ALTER TABLE `animedeck` ADD INDEX `userid` (`userid`)
這將大大加快速度。
一般經驗法則,where子句中的任何字段都需要索引。 默認情況下,MySql將索引主鍵。 因此,您無需手動索引主鍵(即ID字段)。
好吧,我最終按照建議在數據庫中進行了所有更改: https : //www.percona.com/blog/2006/09/29/what-to-tune-in-mysql-server-after-installation /
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