我有一个包含大型报告数据库（300K 行，1.6 GB）的网站。搜索引擎需要很长时间才能显示结果。
通过 3 个表进行搜索：
- 主表有报告的标题、描述和目录。
- 第二个表有每个报告的业务部门（汽车、采矿、医疗保健等）
- 第三个表格有每个报告的国家代码。
它是这样出现的：
之前大约需要 50 秒，现在我将数据库一分为二以获得更快的搜索性能，现在大约需要 30 秒，这仍然很多。
我认为问题应该出在其中一个查询中，但我无法识别错误在哪里。
你能帮我看看如何优化查询吗？这真的很重要。我尝试了不同的解决方案，但都没有奏效。
主表结构：
Field Type Null Key Default Extra
id int(12) NO PRI NULL auto_increment
name varchar(220) NO MUL NULL
data date NO NULL
publication_date date NO MUL NULL
no_pages int(12) NO MUL NULL
description text NO NULL
table_content text NO NULL
type varchar(120) NO MUL NULL
price float NO MUL NULL
currency varchar(12) NO MUL NULL
status int(12) NO MUL NULL
organizer_id int(12) NO MUL NULL
pic varchar(80) NO NULL
main_sec varchar(80) NO NULL
main_reg varchar(80) NO NULL
索引
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
reports 0 PRIMARY 1 id A 129700 NULL NULL BTREE
reports 1 publication_date 1 publication_date A 712 NULL NULL BTREE
reports 1 price 1 price A 584 NULL NULL BTREE
reports 1 name_2 1 name A 129700 NULL NULL BTREE
reports 1 organizer_id 1 organizer_id A 48 NULL NULL BTREE
reports 1 type 1 type A 162 NULL NULL BTREE
reports 1 status 1 status A 4 NULL NULL BTREE
reports 1 currency 1 currency A 4 NULL NULL BTREE
reports 1 no_pages 1 no_pages A 831 NULL NULL BTREE
reports 1 name 1 name NULL 1 NULL NULL FULLTEXT
代码
<?
if (($cr=='' AND $cr_parent=='') OR ($cr!='' AND $sector!='')) {
$zapytanie_s = "SELECT count(DISTINCT u.id) AS ile_s, w.name_cat AS name_cat_s, t.id_cat AS id_cat_s FROM reports as u, sector_index_reports as t, sectors as w WHERE u.id = t.id_obiekt AND w.id = t.id_cat AND u.status!='0' $q $warunek2 $warunek3 $warunek4 $warunek5 $warunek6 $warunek7 GROUP BY w.name_cat ORDER BY ile_s DESC";
} else if ($cr!='' AND $sector_parent!='') {
$zapytanie_s = "SELECT count(DISTINCT u.id) AS ile_s, w.name_cat AS name_cat_s, t.id_cat AS id_cat_s FROM reports as u, sector_index_reports as t, sectors as w WHERE u.id = t.id_obiekt AND w.id = t.id_cat AND u.status!='0' $q $warunek2 $warunek3 $warunek4 $warunek5 $warunek6 $warunek7 GROUP BY w.name_cat ORDER BY ile_s DESC";
//echo $zapytanie_s;
} else {
$zapytanie_s = "SELECT count(DISTINCT u.id) AS ile_s, w.name_cat AS name_cat_s, u.main_sec AS id_cat_s FROM reports as u, country_index_reports as t, sectors as w WHERE u.id = t.id_obiekt AND w.id = u.main_sec AND u.status!='0' $q $warunek2 $warunek3 $warunek4 $warunek5 $warunek6 $warunek7 GROUP BY w.name_cat ORDER BY ile_s DESC";
}
$wynik_s = mysql_query($zapytanie_s);
//echo $zapytanie_s;
WHILE ($row_s = @mysql_fetch_array($wynik_s)) {
extract($row_s); ?>
<div style="margin-top:5px; margin-bottom:10px; margin-left:25px;"><a href="./results.php?s=<? echo $s; ?>&ls=<? echo $ls; ?>&sortuj=<? echo $sortuj; ?>&typ=<? echo $typ; ?>&publish_date=<? echo $publish_date; ?>§or=<? echo $id_cat_s; ?>&cr=<? echo $cr; ?><? echo $cr_parent; ?>&cr_parent=§or_parent=&org_id=<? echo $org_id; ?>&keyword=<? echo $keyword; ?>" style="color:#000000"><? echo $name_cat_s;
if ($sector=='' AND $cr_parent=='') { print (" ($ile_s)"); } else if ($cr_parent!='') { print (" "); } else { print (" ($liczba_rekordow)"); }
?></a> </div>
<? } ?>
</div>
<? // } ?>
<? //if ($sector_parent=='') { ?>
<div style="margin-bottom:5px;margin-top:20px;"><strong>| Countries/Regions: </strong>
<? if ($cr!='') { ?>
<span class="dopaginacji" style="float:right; margin-top:-8px;"><a href="./results.php?s=<? echo $s; ?>&ls=<? echo $ls; ?>&sortuj=<? echo $sortuj; ?>&typ=<? echo $typ; ?>&publish_date=<? echo $publish_date; ?>§or=<? echo $sector; ?>&cr=&cr_parent=§or_parent=<? echo $sector_parent; ?>&org_id=<? echo $org_id; ?>&keyword=<? echo $keyword; ?>" style="color:#000000"><b>x</b> clear</span></a>
<? } ?>
</div>
<div style="width:100%; max-height:300px; overflow:auto; ">
<?
if ($sector=='' AND $sector_parent=='') {
$zapytanie_s = "SELECT count(DISTINCT u.id) AS ile_s, w.name_cat AS name_cat_s, t.id_cat AS id_cat_s FROM reports as u, country_index_reports as t, countries as w WHERE u.id = t.id_obiekt AND w.id = t.id_cat AND u.status!='0' $q $warunek2 $warunek3 $warunek4 $warunek5 $warunek6 $warunek7 GROUP BY w.name_cat ORDER BY ile_s DESC";
} else if ($cr!='' AND $sector!='') {
$zapytanie_s = "SELECT count(DISTINCT u.id) AS ile_s, nn.name_cat AS name_cat_s, u.main_reg AS id_cat_s FROM reports as u, sector_index_reports as t, countries as nn WHERE u.id = t.id_obiekt AND nn.id = u.main_reg AND u.status!='0' $q $warunek2 $warunek3 $warunek4 $warunek5 $warunek6 $warunek7 GROUP BY nn.name_cat ORDER BY ile_s DESC";
} else {
$zapytanie_s = "SELECT count(DISTINCT u.id) AS ile_s, w.name_cat AS name_cat_s, u.main_reg AS id_cat_s FROM reports as u, sector_index_reports as t, countries as w WHERE u.id = t.id_obiekt AND w.id = u.main_reg AND u.status!='0' $q $warunek2 $warunek3 $warunek4 $warunek5 $warunek6 $warunek7 GROUP BY w.name_cat ORDER BY ile_s DESC";
//echo $zapytanie_s;
}