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MySql pašizveidotās funkcijas iekš SELECT'a drausmīgi lēns query p


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tiku vaļā no `in`.

delimiter $$

CREATE DEFINER=`attelsr_web_adm`@`192.168.0.164` FUNCTION `getSawOperHc`(operationClass VARCHAR(10), thick DECIMAL(8,3)) RETURNS varchar(50) CHARSET utf8
BEGIN
RETURN(
SELECT
hansaCode
FROM
   	(SELECT
       	hansaCode
   	FROM
       	hwe2_products
   	Join hwe2_product_classification ON hwe2_products.hansaCode = hwe2_product_classification.productHansaCode
   	JOIN hwe2_classifications ON hwe2_product_classification.classificationClassID = hwe2_classifications.classID
   	WHERE
       	classificationClassId = operationClass) AS t
       	Join
   	hwe2_product_classification ON t.hansaCode = hwe2_product_classification.productHansaCode
       	JOIN
   	hwe2_classifications ON hwe2_product_classification.classificationClassID = hwe2_classifications.classID
WHERE
   	className = thick
);
END$$

 

paskatījos ja es izpildu funkciju kur ir iselektēti ~ 300 ieraksti tad tas laiks ir ~ 0.5, bet tur kur izselektēti ieraksti ir tikai kādi ~ 20 tur tas izpildes laiks sarūk līdz 0.03

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EXPLAIN's Selectam kurā ir izmantota funkcija

id    select_type    table    type    possible_keys    key    key_len    ref    rows    Extra
1    PRIMARY    <derived2>    ALL    NULL    NULL    NULL    NULL    227    "Using filesort"
1    PRIMARY    hwe2_product_classification    ref    PRIMARY,productHansaCode,classificationClassID    productHansaCode    62    lksp.hc    1    
1    PRIMARY    hwe2_classifications    eq_ref    PRIMARY,classID    PRIMARY    32    attelsr_web.hwe2_product_classification.classificationClassID    1    
2    DERIVED    hwe2_product_classification    ref    PRIMARY,productHansaCode,classificationClassID    classificationClassID    32   	 307    "Using where; Using temporary; Using filesort"
2    DERIVED    hwe2_products    eq_ref    PRIMARY,hansaCode    PRIMARY    62    attelsr_web.hwe2_product_classification.productHansaCode    1    "Using where"

 

 

Edited by Sasa
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tiku vaļā no `in`.

delimiter $$

CREATE DEFINER=`attelsr_web_adm`@`192.168.0.164` FUNCTION `getSawOperHc`(operationClass VARCHAR(10), thick DECIMAL(8,3)) RETURNS varchar(50) CHARSET utf8
BEGIN
RETURN(
SELECT
hansaCode
FROM
   	(SELECT
       	hansaCode
   	FROM
       	hwe2_products
   	Join hwe2_product_classification ON hwe2_products.hansaCode = hwe2_product_classification.productHansaCode
   	JOIN hwe2_classifications ON hwe2_product_classification.classificationClassID = hwe2_classifications.classID
   	WHERE
       	classificationClassId = operationClass) AS t
       	Join
   	hwe2_product_classification ON t.hansaCode = hwe2_product_classification.productHansaCode
       	JOIN
   	hwe2_classifications ON hwe2_product_classification.classificationClassID = hwe2_classifications.classID
WHERE
   	className = thick
);
END$$

 

paskatījos ja es izpildu funkciju kur ir iselektēti ~ 300 ieraksti tad tas laiks ir ~ 0.5, bet tur kur izselektēti ieraksti ir tikai kādi ~ 20 tur tas izpildes laiks sarūk līdz 0.03

 

Nav iespēja iekšējā selektā ielikt to - `className = thick`

Domāju, ka varētu arī palīdzēt.

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