CALL for a procedure keeps loading, takes high CPU, and fails - mysql

Question

I am trying to create a procedure that will take a view table , composed from thousands of records, and will filter it by removing several records according to various conditions.
When I try to use the CALL to run it, it keeps on loading, and according to WHM Panel, the process (phpMyAdmin/import.php) takes about 90% of CPU power.
Eventually it fails perhaps after 10 min due to a timeout:
Static analysis:
1 errors were found during analysis.
Missing expression. (near "ON" at position 25) SQL query: Edit Edit
SET FOREIGN_KEY_CHECKS = ON;
MySQL said: Documentation
2006 - MySQL server has gone away
I'm using the following code, and the new view table is using 3 DB tables:
vw_r2_items_tr, is using a tr DB core table, and a vw_items - a view table which uses items and visits core tables
DELIMITER $$
CREATE VIEW `vw_r2_items_tr` AS
SELECT
IF((`i`.`id` = `t`.`item_ord`),1,0) AS `has_tr`,
`i`.`calculated_score` AS `calculated_score`,
`i`.`visited_at` AS `visited_at`,
`i`.`ip_address` AS `ip_address`,
`i`.`user_id` AS `user_id`,
`i`.`visit_id` AS `visit_id`,
`i`.`product_id` AS `product_id`,
`i`.`name` AS `name`,
`i`.`id` AS `id`,
`i`.`item_no` AS `item_no`,
FROM (`vw_items` `i`
LEFT JOIN `trs` `t`
ON (((`t`.`visit_id` = `i`.`visit_id`)
AND (`t`.`item_ord` = `i`.`id`))))$$
DELIMITER ;
DELIMITER $$
CREATE PROCEDURE `vw_unique_trs2`()
BEGIN
SET #vat=0;
SET #ht=0;
SET #tdiff=0;
-- EXPLAIN
SELECT
COUNT(*) AS ct,
tb1.* FROM (SELECT it.*, #tdiff:=UNIX_TIMESTAMP(CONVERT_TZ(it.visited_at,'+00:00',##global.time_zone)) AS tdiffs,
IF(#vat > 0 AND ((#vat-#tdiff) < 28800 AND (#vat-#tdiff) > -28800),#vat DIV 28800, #tdiff DIV 28800) AS diff,
#ht:=(IF(#vat > 0 AND ((#vat-#tdiff) < 28800 AND (#vat-#tdiff) > -28800),#ht+has_tr,has_tr)) hts,
#vat:=(IF(#vat > 0 AND ((#vat-#tdiff) < 28800 AND (#vat-#tdiff) > -28800),#vat,#tdiff)) curr_vat
FROM (SELECT * FROM (SELECT * FROM `vw_r2_items_tr` ORDER BY has_tr DESC, item_no, visited_at) AS tb
GROUP BY `tb`.`visit_id`,`tb`.`product_id`) AS it
ORDER BY has_tr DESC, it.visited_at DESC
) AS tb1
GROUP BY user_id, calculated_score, diff, hts;
END$$
DELIMITER ;

Answer 1

i think you cant use only one "ON" with two join, try to do 2 join query like that
`SELECT *
FROM Table1
LEFT JOIN Table2 ON Table1.key = Table2.key` and
LEFT JOIN Table3 ON Table1.key = Table2.key`