允许的内存大小为 8589934592 字节已用尽

Question

我在 Laravel 的日程安排上遇到了问题。

我发现有关于此错误的重复问题，但这些问题并不能解决我的问题

root@trafficshield:/var/www/vhosts/trafficshield.tools/httpdocs# /opt/plesk/php/7.1/bin/php artisan schedule:run 运行调度 命令：关闭 ^[[15~PHP 致命错误：允许的内存大小为 8589934592 字节用尽（试图分配 4096 字节） /var/www/vhosts/trafficshield.tools/httpdocs/vendor/laravel/framework/src/Illum inate/Database/Eloquent/Model.php 第 279 行 PHP

此时间表旨在统计所有活动对我们服务的访问次数。

    $schedule->call(function () {
        $campaigns = Campaign::all();
        foreach ($campaigns as $campaign) {
            $campaign->denied_visits = $campaign->visitsDenied->count();
            $campaign->allowed_visits = $campaign->visitsAllowed->count();
            $campaign->save();
        }
    })->everyFiveMinutes();

如何更改 PHP 代码以避免此问题？

配置：memory_limit : 8G

提前感谢您的帮助。

Answer 1

Allowed memory size of 8589934592 bytes exhausted

这种错误是由于内存中的数据量很大，所以修复它的方法是编写一个不太重的内存脚本。通过更改memory_limit，我们只能得到临时修复，因为当我们的数据增长时它会回来。

    $campaigns = Campaign::all(); //at this point you are pulling the whole Campaigns table to memory.. and you pull some extra rows after that increasing even more the memory use

正如我所说，Elloquent 在执行此类任务时效率很低，所以让我们像 mysqli 过去那样，一一获取数据库行：

  $db = DB::connection()->getPdo(); //get a database connection instance

  $main_query_sql = "SELECT * FROM Campaigns"; //write our query 
  $main_query = $db->prepare($main_query_sql); //prepare it to get executed
  $main_query->execute(); //execute our query


  $visits_denied_sql = "SELECT COUNT(*) as total FROM VISITS WHERE DENIED = 1 AND CAMPAIGN_ID ="; //let's prepare our aggregate queries

  $visits_allowed_sql = "SELECT COUNT(*) as total FROM VISITS WHERE DENIED = 0 AND CAMPAIGN_ID ="; //I just assumed them so change it as you need

  $visits_denied = null;
  $visits_allowed = null;

  while($campaign = $main_query->fetch()){ //fetch our rows one by one
      //now we are getting an associative array from the db instead of a model so we cannot use it as a Laravel Model (we can't use ->save() method or eager loading)
      $visits_denied = $db->prepare($visits_denied_sql.$campaign['id']);
      $visits_denied = $visits_denied->execute();
      $denied_visits = $visits_denied->fetch();

      $visits_allowed= $db->prepare($visits_allowed_sql.$campaign['id']);
      $visits_allowed= $visits_allowed->execute();
      $allowed_visits = $visits_allowed->fetch();

      $campaign['denied_visits'] = $denied_visits['total'];
      $campaign['allowed_visits'] = $allowed_visits['total'] ;

      //edit with the correct update sentence:
      $insert_query_sql = "UPDATE CAMPAIGNS SET allowed_visits = :visits_allowed, denied_visits = :visits_denied WHERE id = :id";
        $insert_query = $db->prepare($insert_query_sql);
        $insert_query->bindParam(':visits_allowed', $campaign['allowed_visits']);
        $insert_query->bindParam(':visits_denied', $campaign['denied_visits']);
        $insert_query->bindParam(':id', $campaign['id']);
        $insert_query->execute();

  }

在你的日程安排中试试这个，如果有效，请告诉我！