MyISAM引擎和Heap引擎执行速度的性能测试
2008-10-17 11:12:25 来源:WEB开发网更新操作:
[更新所有name=heiyeluren的记录为heiyeluren2,在SQLyog下执行]
Heap engine update used time: 2.500
MyISAM engine update used time: 16.000
删除操作:
[删除所有name=heiyeluren2的记录,在SQLyog下执行]
Heap engine delete used time: 51.172
MyISAM engine delte used time: 5.578
总结:
大家可以发现,Heap在插入、查询、更新操作上明显要比MyISAM快,但是删除操作稍稍有些慢,可能跟它在内存中的存储结构有关系,所以我们完全可以把Heap作为我们一个MyISAM表的一个备份,比如可以保存一些实时性要求比较高的数据,比如点击量、评论量、固定的用户信息等等,因为这些信息普遍就是插入和查询操作。
其实,Heap并没有比MyISAM快太多,这样说明我的MyISAM速度还是非常快的,所以一般情况下,MyISAM能够满足大部分的应用,如果数据太多的话,大家可以考虑把部分常用的数据保存到Heap表中,同时我们也可以结合Memcache等缓存工具来辅助缓存数据。
测试代码:
<?php
/**
* function lib
*/
function conn(){
$host = "localhost";
$user = "root";
$pass = "";
$db = "test";
$conn = mysql_connect($host, $user, $pass);
if (!$conn || !is_resource($conn)){
die("Connect to mysql failed: ". mysql_error());
}
mysql_select_db($db);
return $conn;
}
function query($conn, $sql){
$res = mysql_query($sql, $conn);
if (!$res){
echo mysql_error()." ";
return false;
}
return true;
}
function get_data($conn, $sql){
$res = mysql_query($sql, $conn);
if (!$res){
echo mysql_error()." ";
return false;
}
$result = array();
while($row = mysql_fetch_array($res)){
$result[] = $row;
}
return $result;
}
function get_time()
{
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
/**
* Insert test
*/
$conn = conn();
$count = 200000;
//Heap engine
$s1 = get_time();
for($i=0; $i<$count; $i++){
query($conn, "insert into tbl_heap set name = ´heiyeluren´,
email=´heiyeluren@abc.com´, summary=´This message is summary´");
}
$e1 = get_time();
echo "Heap engine insert $count record used time: ". ($e1-$s1) ." ";
//MyISAM engine
$s2 = get_time();
for($i=0; $i<$count; $i++){
query($conn, "insert into tbl_isam set name = ´heiyeluren´,
email=´heiyeluren@abc.com´, summary=´This message is summary´");
}
$e2 = get_time();
echo "MyISAM engine insert $count record used time: ". ($e2-$s2) ." ";
/**
* Select test
*/
$count = 1000;
$records = 10000;
$s1 = get_time();
for($i=0; $i<$count; $i++){
$res = get_data($conn, "select * from tbl_heap limit $records");
unset($res);
}
$e1 = get_time();
echo "Heap engine select $count record used time: ". ($e1-$s1) ." ";
$s2 = get_time();
for($i=0; $i<$count; $i++){
$res = get_data($conn, "select * from tbl_isam limit $records");
unset($res);
}
$e2 = get_time();
echo "MyISAM engine select $count record used time: ". ($e2-$s2) ." ";
?>
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