我有一个MySQL数据库,我想进行更大的搜索
我在其中一张桌子上有大约10k的记录,预计它会增长,但速度很慢
最大的问题是,要执行搜索,我必须使用4个JOINS进行查询,我认为这会导致搜索速度变慢。
所以这里有一些示例结构:
[table records]
id INT unsigned PRIMARY KEY auto_increment
description text
label INT unsigned
type INT unsigned
price DECIMAL
[table records_labels]
id INT unsigned PRIMARY KEY auto_increment
label varchar
[table records_types]
id INT unsigned PRIMARY KEY auto_increment
type varchar
[table records_serial]
id INT unsigned PRIMARY KEY auto_increment
serial varchar
record INT unsigned
[table records_barcode]
id INT unsigned PRIMARY KEY auto_increment
barcode varchar
record INT unsigned
所以这就是事情的运行方式:
我运行一个选择records.id, records.description, records.price, records_labels.label, records_types.type, records_serial.serial, records_barcode.barcode;
的查询
所以完整的查询是这样的:
SELECT records.id, records.description, records.price, records_labels.label, records_types.type, records_serial.serial, records_barcode.barcode FROM records JOIN records_labels ON records_labels.id = records.label JOIN records_types ON records_types.id = records.type LEFT JOIN records_serial ON records_serial.record = record.id LEFT JOIN records_barcode ON records_barcode.record = record.id WHERE records_serial.serial LIKE %SEARCH_TERM% OR records_barcode.barcode LIKE %SEARCH_TERM%
我认为这里的解决方案是索引我猜,但我对它不是很熟悉 那么很快,如何加快和优化这种查询?
答案 0 :(得分:1)
CREATE INDEX ilabel ON records (`label`);
CREATE INDEX itype ON records (`type`);
ALTER TABLE records_label MODIFY label INT(10) UNSIGNED NULL;
CREATE INDEX ilabel ON records_label (`label`);
ALTER TABLE records_types MODIFY `type` INT(10) UNSIGNED NULL;
CREATE INDEX itype ON records_types (`type`);
SELECT r.id, r.description, r.price, rl.label,
rt.`type`, records_serial.`serial`, records_barcode.barcode
FROM records r
INNER JOIN records_labels rl ON rl.id = r.label
INNER JOIN records_types rt ON rt.id = r.`type`
WHERE
r.id IN (
SELECT rs.record
FROM records_serial rs
WHERE rs.`serial` LIKE '%SEARCH_TERM%'
)
OR
r.id IN (
SELECT rb.record
FROM records_barcode rb
WHERE rb.barcode LIKE '%SEARCH_TERM%'
);
CREATE INDEX iserial ON records_serial (`serial`(10));
CREATE INDEX ibarcode ON records_barcode (`barcode`(10));
它可以进一步改善,但随着这些变化我相信你实现了你想要的。 ; - )