多次选择和插入运行的php脚本比以前慢得多

Question

我有一个工作脚本，该脚本从数据库中进行选择，存储用于第二次选择查询的参数，然后将这些选择的值中的一些以及轻微的聚合插入最终的DB表中。

此脚本可以很好地工作，可以返回/插入期望的数据，但要花很长时间才能运行。

在20分钟内完成了大约300条记录。

我只是在这里完全缺少一些东西，会导致它运行得如此缓慢？

$selectPlacements = "
    SELECT DISTINCT
        sku_id, s.frame as frame, sg.group_code as group_code, sg.name as group_name, s.cover1 as cover, s.color1 as color, dealer_id
    FROM placements p
    inner join skus s 
    on p.sku_id = s.id
    inner join sku_groups sg 
    on sg.id = s.sku_group_id
    where p.expire_date > curdate()
    ;
";

try {
    $placementCheck = $MysqlConn->prepare($selectPlacements);
    $detailRslt = $placementCheck->execute();

     while ($placementRow = $placementCheck->fetch(PDO::FETCH_ASSOC)) {

        print_r($placementRow); //This prints the array I need

        $salesValues = [
        ":dealer_id" => $placementRow["dealer_id"],
        ":frame" => $placementRow["frame"],
        ":cover" => $placementRow["cover"],
        ":color" => $placementRow["color"],
        "group_code" => $placementRow["group_code"],
        "group_name" => $placementRow["group_name"],
        ];



        $checkSales = "
            SELECT
                count(*) as sales_180,
                180/count(*) as velocity,
                CAST(:group_code AS CHAR(10)),
                CAST(:group_name AS CHAR(10)),
                cr.xslsno as salesNum,
                cr.slsupr as VP
            FROM group g
                inner join custRecords cr
                    on g.cstnoc = cr.xcstno
            WHERE g.cstnoc = :dealer_id
                AND g.framec = :frame
                AND g.covr1c = :cover
                AND g.colr1c = :color
                AND date(substr(g.extd1d,1,4)||'-'||substr(g.EXTD1d,5,2)||'-'||substr(g.EXTD1d,7,2) ) between current_Date - 180 DAY AND current_Date
            GROUP BY cr.xslsno, cr.slsupr
        ";

        try{    
            $salesCheck = $DB2conn->prepare($checkSales);
            $salesResult = $salesCheck->execute($salesValues);

            $insertSales = "

                INSERT INTO testmetrics (dealer, frame, cover, color, groupnum, groupname, last180days_sales, velocity, repnumber, vpnumber )
                VALUES (
                    :dealer_id, 
                    :frame,
                    :cover,
                    :color,
                    :group_code,
                    :group_name,
                    :SALES_180,
                    :VELOCITY,
                    :SALESNUM,
                    :VP
                )
            ";

            $velocityInsertPrep = $DB2conn->prepare($insertSales);

            while ($salesRow = $salesCheck->fetch(PDO::FETCH_ASSOC)) {

                $salesValues[":SALES_180"] = $salesRow["SALES_180"];
                $salesValues[":VELOCITY"] = $salesRow["VELOCITY"];
                $salesValues[":SALESNUM"] = $salesRow["SALESNUM"];
                $salesValues[":VP"] = $salesRow["VP"];


                print_r($salesValues);
                try{

                    $velocityExecution = $velocityInsertPrep->execute($salesValues);

                }catch(PDOException $ex){

                    echo "INSERT_FAILED: " .$ex->getMessage();

                }


             }

        }catch(PDOException $ex) {
            echo "QUERY TWO FAILED!: " .$ex->getMessage(); 
        }
    }

}catch(PDOException $ex) {
    echo "QUERY ONE FAILED!: " .$ex->getMessage();
}