ASP.NET,MySQL与SQL Server中的数据库连接

只打开连接的一个非常简单的循环在SQL Server中快了10倍：

// MySQL

const string CONNECTION_STRING = 
"server=localhost;database=testdb;user id=root;password=mypassword;max pool size=250;";
for (int i = 0; i < 5000; i++)
{
  using (MySqlConnection con = new MySqlConnection(CONNECTION_STRING))
  {
    con.Open();
  }
}

// SQL Server

const string CONNECTION_STRING = "Data Source=localhost;Initial Catalog=testdb;Integrated Security=True;max pool size=250;";
for (int i = 0; i < 5000; i++)
{
  using (SqlConnection con = new SqlConnection(CONNECTION_STRING))
  {
    con.Open();
  }
}

SQL Server在其他任何方面都要快得多(选择,更新,插入……等).我做错了吗？我应该改变哪些服务器变量？

更多信息：
– 我在Windows上运行MySQL(5.0.51a-community-nt)
– 测试中使用了SQL Server 2005
– 规格：Windows XP SP2,CPU Intel 1.6GHz双核,1024 MB RAM

这是MySQL的配置：

[client]
port        = 3306
socket      = /tmp/mysql.sock

[mysqld]
port        = 3306
socket      = /tmp/mysql.sock
skip-locking
key_buffer = 384M
max_allowed_packet = 1M
table_cache = 512
sort_buffer_size = 2M
read_buffer_size = 2M
read_rnd_buffer_size = 8M
myisam_sort_buffer_size = 64M
thread_cache_size = 8
query_cache_size = 32M
thread_concurrency = 8

server-id   = 1

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash

[isamchk]
key_buffer = 256M
sort_buffer_size = 256M
read_buffer = 2M
write_buffer = 2M

[myisamchk]
key_buffer = 256M
sort_buffer_size = 256M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

谢谢你的任何建议……