Слишком много вызовов базы данных

Question

У меня есть сценарий автоматического обновления, который обновляет страницу каждые 3 секунды. На странице он обновляет несколько запросов к базе данных. Когда на моем сайте появляется 20 или более членов, сервер выходит из строя из-за всех вызовов в базу данных. Есть ли другой способ проверить изменения в базе данных?

//Can't Chat 
$strFind="SELECT * FROM cantchat"; 
$result=mysql_query($strFind) or die(mysql_error()); 
while($row=mysql_fetch_array($result)) 
{ 
$id=$row['memid']; 

$strsql="DELETE FROM cometchat_chatroommessages WHERE userid=\"$id\""; 
$chkrow1=mysql_query($strsql,$connect) or die(mysql_error()); 

} 


if($banned<1){ 
$strFind="SELECT * FROM ttourmember WHERE memberid=\"$curmemid\""; 
$result=mysql_query($strFind) or die(mysql_error()); 
$row=mysql_fetch_array($result); 
$membername=$row['membername']; 
$console=$row['system']; 

# timeout - how long should it take before visitors are no longer 'online'? (in  minutes) 
define ('timeout', 20); 
// check if visitor is already in the table 
$lastactive =time(); 
$strFind="SELECT COUNT(*) AS total FROM online WHERE `memberid`=\"$curmemid\""; 
$result=mysql_query($strFind) or die(mysql_error()); 
$row=mysql_fetch_array($result); 
$imonline=$row['total']; 

if ($imonline<1) { 
// Insert new visitor 
$strsql="INSERT INTO online(lastactive,memberid,membername,console,ipaddress,accountactive) VALUES(\"$lastactive\",\"$curmemid\",\"$membername\",\"$console\",\"$ip\",'Y')"; 
$chkrow1=mysql_query($strsql,$connect) or die(mysql_error()); 
$onlineid=mysql_insert_id();//copied   
} else { 
// Update exisiting visitor 
$strsql="UPDATE online SET  `lastactive`=\"$lastactive\",membername=\"$membername\",console=\"$console\",ipaddress=\"$i p\" WHERE `memberid`=\"$curmemid\""; 
mysql_query($strsql,$connect) or die(mysql_error()); 
$chkrow5=mysql_affected_rows($connect); 

$strsql="UPDATE ttourmember SET `ipadd`=\"$ip\" WHERE `memberid`=\"$curmemid\""; 
mysql_query($strsql,$connect) or die(mysql_error()); 
$chkrow5=mysql_affected_rows($connect); 

} 

// Remove any inactive visitors 
$inactive = time()-21; 

//Who's Online list 
$strFind="SELECT * FROM online WHERE lastactive< $inactive AND `stay`<>'Y'"; 
$result=mysql_query($strFind) or die(mysql_error()); 
while($row=mysql_fetch_array($result)) 
{ 
$friendid=$row['memberid'].","; 

$strsql="DELETE FROM friends WHERE toid=\"$friendid\" OR fromid=\"$friendid\""; 
$chkrow1=mysql_query($strsql,$connect) or die(mysql_error()); 

} 

$strsql="DELETE FROM online WHERE lastactive < $inactive AND stay<>'Y'"; 
mysql_query($strsql,$connect) or die(mysql_error()); 
$chkrow5=mysql_affected_rows($connect); 

//Can Chat 
$query_chat = "SELECT * FROM online WHERE `memberid`<>\"$curmemid\" ORDER BY membername  DESC"; 
$chat = mysql_query($query_chat) or die(mysql_error()); 
$row_chat = mysql_fetch_assoc($chat); 
$totalRows_chat = mysql_num_rows($chat); 


//Count Pending Games 
$strFind="SELECT COUNT(*) AS total FROM tgamertournament WHERE `memberid` =  \"$curmemid\" AND `pending`='Y'"; 
$result=mysql_query($strFind) or die(mysql_error()); 
$row=mysql_fetch_array($result); 
$tpgames=$row['total']; 

$strFind="SELECT COUNT(*) AS total FROM tgamertournament WHERE `targetto` = \"$curmemid\" AND `pending`='Y'"; 
$result=mysql_query($strFind) or die(mysql_error()); 
$row=mysql_fetch_array($result); 
$topgames=$row['total']; 

$pgames=$tpgames+$topgames; 

//Steam Received Sent Challenge 
$query_stgames = "SELECT * FROM tgtournamentrequest WHERE `gamer`=\"$curmemid\" AND `active`<>'D' AND `scored`<>'Y' AND `type`='S' AND `startfteam`='Y' AND `isaccepted`='N' AND `startsteam`='N' ORDER BY tournamentid DESC LIMIT 3"; 
$stgames = mysql_query($query_stgames) or die(mysql_error()); 
$row_stgames = mysql_fetch_assoc($stgames); 
$totalRows_stgames = mysql_num_rows($stgames); 

//Waiting For Fteam Sent Challenge To Get Accepted 
$query_wftgames = "SELECT * FROM tgtournamentrequest WHERE `fteam`=\"$curmemid\" AND `active`<>'D' AND `scored`<>'Y' AND `type`='S' AND `startfteam`='Y' AND `isaccepted`='N' AND `startsteam`='N' ORDER BY tournamentid DESC LIMIT 3"; 
$wftgames = mysql_query($query_wftgames) or die(mysql_error()); 
$row_wftgames = mysql_fetch_assoc($wftgames); 
$totalRows_wftgames = mysql_num_rows($wftgames); 

//List Posted Pending Games Accepted 
$query_apostedgames = "SELECT * FROM tgtournamentrequest WHERE `gamer` = \"$curmemid\"  OR `fteam`=\"$curmemid\" AND `active`<>'D' AND `scored`<>'Y' AND `type`='P' ORDER BY  tournamentid DESC LIMIT 3"; 
$apostedgames = mysql_query($query_apostedgames) or die(mysql_error()); 
$row_apostedgames = mysql_fetch_assoc($apostedgames); 
$totalRows_apostedgames = mysql_num_rows($apostedgames); 

//List Posted Pending Games 
$query_postedgames = "SELECT * FROM tgtournamentrequest WHERE `gamer` = \"$curmemid\" OR `fteam`=\"$curmemid\" AND `active`<>'D' AND `scored`<>'Y' AND `type`='P' ORDER BY tournamentid DESC LIMIT 3"; 
$postedgames = mysql_query($query_postedgames) or die(mysql_error()); 
$row_postedgames = mysql_fetch_assoc($postedgames); 
$totalRows_postedgames = mysql_num_rows($postedgames); 

//Report Score 
$query_score = "SELECT * FROM tgtournamentrequest WHERE `fteam` = \"$curmemid\" AND `gamer`<>'0' AND `isaccepted`='Y' AND `active`='Y' AND `startfteam`='Y' AND `startsteam`='Y' AND `scored` <>'Y' ORDER BY tournamentid DESC LIMIT 3"; 
$score = mysql_query($query_score) or die(mysql_error()); 
$row_score = mysql_fetch_assoc($score); 
$totalRows_score = mysql_num_rows($score); 

//Steam Pending Score 
$query_pscore = "SELECT * FROM tgtournamentrequest WHERE `gamer` = \"$curmemid\" AND `fteam`<>'0' AND `active`='Y' AND `startfteam`='Y' AND `startsteam`='Y' AND scored <>'Y' ORDER BY tournamentid DESC LIMIT 3"; 
$pscore = mysql_query($query_pscore) or die(mysql_error()); 
$row_pscore = mysql_fetch_assoc($pscore); 
$totalRows_pscore = mysql_num_rows($pscore); 

//Delete Games 
$query_dmoline = "SELECT * FROM tgamertournament WHERE `memberid` = \"$curmemid\" AND `deleted`<>'Y' AND `scored`<>'Y' AND `accepted` <>'Y' AND `targetto`='0' AND `isactive`='Y'"; 
$dmoline = mysql_query($query_dmoline) or die(mysql_error()); 
$row_dmoline = mysql_fetch_assoc($dmoline); 
$totalRows_dmoline = mysql_num_rows($dmoline); 

Answer 1

Is there another way to check for changes in the database?

Попробуйте show processlist в PhpMyAdmin или MySQL-оболочки в то время как ваш сайт «под ударом» ... Вы должны видеть запущенные запросы и как долго они работают. Возможно, вы найдете несколько тяжелых запросов.

Answer 2

Ну, во-первых, я бы не сделать следующее:

$strFind="SELECT * FROM online WHERE lastactive< $inactive AND `stay`<>'Y'"; 
$result=mysql_query($strFind) or die(mysql_error()); 
while($row=mysql_fetch_array($result)) 
{ 
$friendid=$row['memberid'].","; 

$strsql="DELETE FROM friends WHERE toid=\"$friendid\" OR fromid=\"$friendid\""; 
//echo $strsql; 
//exit; 
$chkrow1=mysql_query($strsql,$connect) or die(mysql_error()); 

} 

Вместо захватить все идентификаторы и удалить их. Я бы тоже получил только один столбец, который мне нужно сделать:

$strFind="SELECT memberid FROM online WHERE lastactive< $inactive AND `stay`<>'Y'"; 
$result=mysql_query($strFind) or die(mysql_error()); 
$offline = array(); 
while($row=mysql_fetch_array($result)) 
{ 
    $offline[]="'{$row['memberid']}'"; 
} 
$friendids = implode(',', $offline); 

$strsql="DELETE FROM friends WHERE toid IN ($friendids) OR fromid IN ($friendids)"; 
$chkrow1=mysql_query($strsql,$connect) or die(mysql_error());