我有這樣的MySQL查詢這我加載到我家控制器和運行後,笨的$searchterm = $this->search_model->searchterm_handler($this->input->get_post('searchterm', TRUE));
我得到的0.7110
如何提高Codeigniter中的MySQL查詢性能?
查詢的執行時間我的模型裏面:
<?php
class Search_Model extends CI_Model
public function search($searchterm,$limit)
{
$sql = "SELECT cast(s.req_date as Date) as Date, SUM(s.sTransaction)+SUM(r.rTransaction) as SUMt, SUM(s.sSuccess)+ SUM(r.rSuccess) as SUMs, s.sTransaction, r.rTransaction, s.sSuccess, r.rSuccess
FROM
(SELECT s.req_date, COUNT(*) as sTransaction, SUM(s.status = 0) as sSuccess
FROM transaction_log_ats_201503 as s WHERE cast(s.req_date as time) BETWEEN '00:00:00' AND '$searchterm'
GROUP BY cast(req_date as Date) desc) as s
JOIN
(SELECT r.req_date, COUNT(*) as rTransaction, SUM(r.status = 0) as rSuccess
FROM transaction_log_atr_201503 as r WHERE cast(r.req_date as time) BETWEEN '00:00:00' AND '$searchterm'
GROUP BY cast(req_date as Date) desc) as r
ON cast(s.req_date as date)=cast(r.req_date as date)
GROUP BY Date desc";
$q = $this->db->query($sql);
if($q->num_rows() > 0)
{
foreach($q->result() as $row)
{
$data[] = $row;
}
return $data;
}
else
{
return 0;
}
}
?>
有什麼提高查詢性能的可靠方法?
謝謝。
您將需要重新設計您的查詢,以便它不使用嵌套的select語句並僅依賴連接。然後,您需要將索引添加到您用於連接的字段中。 – 2015-04-02 15:37:44
你能告訴我如何在這種情況下使用INDEX嗎?謝謝 – 2015-04-09 03:00:48
不知道你的表結構。首先是重新設計你的查詢來擺脫嵌套的select語句。它可能會更好地執行,如果你把它分成幾個查詢,並在php中關聯數據。索引是一個廣泛的主題,但沒有那麼複雜的概念。做一些閱讀你會發現很多關於這個主題的教程 – 2015-04-09 08:12:32