MySQL服務器頻繁自動重啓，後來永久關機

MySQL服務器頻繁重啓。在不到24小時內75次。最後不用重新開始就結束了！MySQL服務器頻繁自動重啓，後來永久關機

請檢查細節，在這裏記錄：mysqld.log

140113 10:18:22 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended 

140113 10:18:31 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql 
140113 10:18:31 InnoDB: Initializing buffer pool, size = 8.0M 
140113 10:18:31 InnoDB: Completed initialization of buffer pool 
140113 10:18:31 InnoDB: Started; log sequence number 16 1064411530 
140113 10:18:32 [Note] Event Scheduler: Loaded 0 events 
140113 10:18:32 [Note] /usr/libexec/mysqld: ready for connections. 
Version: '5.1.61' socket: '/var/lib/mysql/mysql.sock' port: 3306 Source distribution 

140113 18:45:09 mysqld_safe Number of processes running now: 0 
140113 18:45:10 mysqld_safe mysqld restarted 
140113 18:45:10 InnoDB: Initializing buffer pool, size = 8.0M 
140113 18:45:10 InnoDB: Completed initialization of buffer pool 
140113 18:45:10 InnoDB: Started; log sequence number 16 1064411530 
140113 18:45:11 [Note] Event Scheduler: Loaded 0 events 
140113 18:45:11 [Note] /usr/libexec/mysqld: ready for connections. 
Version: '5.1.61' socket: '/var/lib/mysql/mysql.sock' port: 3306 Source distribution

......

140114 9:50:12 InnoDB: Initializing buffer pool, size = 8.0M 
140114 9:50:12 InnoDB: Completed initialization of buffer pool 
140114 9:50:12 InnoDB: Started; log sequence number 16 1064411530 
140114 9:50:13 [Note] Event Scheduler: Loaded 0 events 
140114 9:50:13 [Note] /usr/libexec/mysqld: ready for connections. 
Version: '5.1.61' socket: '/var/lib/mysql/mysql.sock' port: 3306 Source distribution 

140114 09:55:07 mysqld_safe Number of processes running now: 0 
140114 09:55:07 mysqld_safe mysqld restarted 
140114 9:55:08 InnoDB: Initializing buffer pool, size = 8.0M 
140114 9:55:08 InnoDB: Completed initialization of buffer pool 
140114 09:55:08 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

同時其殺死62個處理因內存不足。請檢查詳細日誌：messages

Jan 14 09:41:53 centos63 kernel: Out of memory: Kill process 16795 (mysqld) score 20 or sacrifice child 
Jan 14 09:41:53 centos63 kernel: Killed process 16795, UID 27, (mysqld) total-vm:574508kB, anon-rss:20488kB, file-rss:164kB

我在每次5分鐘，這是影響約20萬，5萬，在三個表25000個數據的一些表上運行一個cronjob。選擇超過1257個會員然後在9844個member_boards，然後用下面的僞代碼插入/更新超過168624個member_cards：

<?php 
    $qry = _("SELECT _members"); 
    while($member = mysql_fetch_assoc($res)) 
    {//1,257 
     $qry = _("SELECT _member_boards"); 
     while($db_board = mysql_fetch_assoc($board_res)) 
     {//9,844 
      $s_lists = curl_download("https://api.com/boards/lists"); 
      foreach ($lists as $list) {//9,844 
       if(!strcmp('SOMETHING', $list->name)){//Matching with API and DB 
        $curl = "https://api.com/lists/cards"; 
        foreach ($cards as $card) {//168,624 
         $qry = _("SELECT _member_cards"); 
         if($card_row = mysql_fetch_assoc($card_res)){ 
          $qry = _("UPDATE _member_cards"); 
         } 
         else{ 
          echo $qry = _("INSERT _member_cards"); 
         } 
        } 
       } 
      } 

     } 
     $qry = _("UPDATE _member_cards"); 
    } 
?>

那麼什麼能的原因，如何解決這個問題呢？

RAM 512 MB直到現在。

CentOS

擴展RAM可達1 GB解決這個問題嗎？

來源

2014-01-14 itsazzad

是的，它只是因爲'OOM'殺手而停止。（1）定義mysql在其配置中使用的最大值，你可以計算它需要多少（2）限制其他進程（即：你的cron job）以達到最大值（3）如果你仍然用完內存，添加交換（慢）或實際內存（更快但可能更昂貴）。 – Wrikken

你的MySQL服務器因爲使用太多內存而被殺;你可以添加更多的RAM到服務器，或者通過改變配置文件中的一些值來降低MySQL的內存使用率;但是這可能會影響性能。

看看這個question和this one關於調整MySQL的配置指南 - 這不是一件容易的事，它是基於反覆試驗，直到你得到的性能和內存使用之間的良好平衡，你應該嘗試不同的值。

來源

2014-01-14 21:04:35

MySQL服務器頻繁自動重啓，後來永久關機

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