PHP變量和非常緩慢的MySQL查詢

Question

我有以下PHP代碼從表單獲取數據，以及需要15分鐘才能完成的MySQL查詢。它需要更快。我想知道我是否忽略了使用PHP變量和MySQL查詢的任何最佳實踐，以及/或者查詢結構本身是否負責完成所需的不可接受的時間。

查詢的基本目的是統計選民PK出現的投票次數FK，如果計數高於預定義的數字，則從選民表中選擇相應的記錄（基於計算的百分比在最終的PHP條件語句上完成，以及在2004年以後過濾掉所有內容的查詢部分）。

選民表有100萬行，而選票表有700萬，兩個縣EMDSID鍵索引，但我不允許改變表結構，數據將永遠只能從他們讀取，永遠不會寫至。任何有關如何加快速度的建議或建議將不勝感激！

而且，遺憾的作文：P

/* ========== GET VALUES ========== */ 
if (isset($_GET["StreetName"])) { $searchStreetName = $_GET["StreetName"]; } else { $searchStreetName = "%"; } 
if (isset($_GET["City"])) { $searchCity = $_GET["City"]; } else { $searchCity = "%"; } 
if (isset($_GET["Zip"])) { $searchZip = $_GET["Zip"]; } else { $searchZip = "%"; } 
if (isset($_GET["DOBY"])) { $searchDOBY = $_GET["DOBY"]; } else { $searchDOBY = "%"; } 
if (isset($_GET["DOBM"])) { $searchDOBM = $_GET["DOBM"]; } else { $searchDOBM = "%"; } 
if (isset($_GET["DOBD"])) { $searchDOBD = $_GET["DOBD"]; } else { $searchDOBD = "%"; } 
if (isset($_GET["Gender"])) { $searchGender = $_GET["Gender"]; } else { $searchGender = "%"; } 
if (isset($_GET["Party"])) { $searchParty = $_GET["Party"]; } else { $searchParty = "%"; } 
if (isset($_GET["ED"])) { $searchED = $_GET["ED"]; } else { $searchED = "%"; } 
if (isset($_GET["AD"])) { $searchAD = $_GET["AD"]; } else { $searchAD = "%"; } 
if (isset($_GET["CD"])) { $searchCD = $_GET["CD"]; } else { $searchCD = "%"; } 
if (isset($_GET["CO"])) { $searchCO = $_GET["CO"]; } else { $searchCO = "%"; } 
if (isset($_GET["SD"])) { $searchSD = $_GET["SD"]; } else { $searchSD = "%"; } 
if (isset($_GET["CC"])) { $searchCC = $_GET["CC"]; } else { $searchCC = "%"; } 
if (isset($_GET["VoterActivity"])) { $searchVoterActivity = (($_GET["VoterActivity"]/100) * 18); } else { $searchVoterActivity = "0"; } 

/* ========== GET DATA ========== */ 
$sql = "SELECT voters.*, COUNT(votes.CountyEMSID) AS 'activity' 
FROM voters INNER JOIN votes ON voters.CountyEMSID = votes.CountyEMSID 
WHERE voters.StreetName LIKE '$searchStreetName%' 
AND voters.City LIKE '$searchCity%' 
AND voters.Zip LIKE '$searchZip%' 
AND voters.DOBY LIKE '%$searchDOBY' 
AND voters.DOBM LIKE '%$searchDOBM' 
AND voters.DOBD LIKE '%$searchDOBD' 
AND voters.Gender LIKE '$searchGender%' 
AND voters.Party LIKE '$searchParty%' 
AND voters.ED LIKE '%$searchED' 
AND voters.AD LIKE '%$searchAD' 
AND voters.CD LIKE '%$searchCD' 
AND voters.CO LIKE '%$searchCO' 
AND voters.SD LIKE '%$searchSD' 
AND voters.CC LIKE '%$searchCC' 
AND votes.ElectionDateY >= 2004 
AND (
votes.ElectionType = 'GE' 
OR votes.ElectionType = 'PR' 
OR votes.ElectionType = 'PP' 
) 
GROUP BY votes.CountyEMSID 
HAVING COUNT(votes.CountyEMSID) >= '$searchVoterActivity' 
ORDER BY voters.LastName, voters.FirstName, voters.DOBY, voters.DOBM, voters.DOBD ASC 
LIMIT $start, $limit"; 

/* ========== CREATE TABLE ========== */ 
CREATE TABLE voters (
    CountyEMSID varchar(9) NOT NULL, 
    LastName varchar(30) NOT NULL, 
    FirstName varchar(30) NOT NULL, 
    MiddleInitial varchar(1) NOT NULL, 
    NameSuffix varchar(4) NOT NULL, 
    HouseNumber varchar(10) NOT NULL, 
    HouseNumberSuffix varchar(10) NOT NULL, 
    ApartmentNumber varchar(15) NOT NULL, 
    StreetName varchar(50) NOT NULL, 
    City varchar(40) NOT NULL, 
    Zip varchar(5) NOT NULL, 
    ZipCode4 varchar(4) NOT NULL, 
    MailingAddress1 varchar(50) NOT NULL, 
    MailingAddress2 varchar(50) NOT NULL, 
    MailingAddress3 varchar(50) NOT NULL, 
    MailingAddress4 varchar(50) NOT NULL, 
    DOBY varchar(4) NOT NULL, 
    DOBM varchar(2) NOT NULL, 
    DOBD varchar(2) NOT NULL, 
    Gender varchar(1) NOT NULL, 
    Party varchar(3) NOT NULL, 
    Other varchar(30) NOT NULL, 
    ED varchar(3) NOT NULL, 
    AD varchar(2) NOT NULL, 
    CD varchar(2) NOT NULL, 
    CO varchar(2) NOT NULL, 
    SD varchar(2) NOT NULL, 
    CC varchar(2) NOT NULL, 
    RegY varchar(4) NOT NULL, 
    RegM varchar(2) NOT NULL, 
    RegD varchar(2) NOT NULL, 
    Status varchar(2) NOT NULL, 
    VoterType varchar(1) NOT NULL, 
    StatusChangeY varchar(4) NOT NULL, 
    StatusChangeM varchar(2) NOT NULL, 
    StatusChangeD varchar(2) NOT NULL, 
    LastVoted varchar(4) NOT NULL, 
    Telephone varchar(12) NOT NULL, 
    KEY CountyEMSID (CountyEMSID) 
) 

/* ========== CREATE TABLE ========== */ 
CREATE TABLE votes (
    CountyEMSID varchar(9) NOT NULL, 
    County varchar(2) NOT NULL, 
    AD varchar(2) NOT NULL, 
    ED varchar(3) NOT NULL, 
    Party varchar(3) NOT NULL, 
    ElectionDateY varchar(4) NOT NULL, 
    ElectionDateM varchar(2) NOT NULL, 
    ElectionDateD varchar(2) NOT NULL, 
    ElectionType varchar(2) NOT NULL, 
    VoterType varchar(1) NOT NULL, 
    KEY CountyEMSID (CountyEMSID) 
) 

Answer 1

表面上看起來很簡單：你需要使用索引。在模式轉儲中我看不到任何內容。