查询会不断运行，并且内存不足-MySQL 8.0.16 AWS RDS

Question

有人可以在MySQL 8.0.16中为我提供此查询吗？该查询在AWS RDS上无限运行，并耗尽内存，我想问题可能出在UNION ALL和GROUP BY语句上。

SELECT 
       SUM(`CONV`.`ELEGIVEL`) AS `ELEGIVEL`,
       SUM(`CONV`.`ADESAO`) AS `ADESAO`,
       `CONV`.`ano` AS `ano`,
       `CONV`.`mes` AS `mes`,
       `CONV`.`TIPO` AS `TIPO`
   FROM
       (


SELECT 
           SUM(`v`.`QuantidadeItem`) AS `ELEGIVEL`,
               NULL AS `ADESAO`,
               `v`.`ano` AS `ano`,
               `v`.`mes` AS `mes`,
               'BENCH' AS `TIPO`
       FROM
           `V_VENDAS_ELEGIVEIS` `v`
       WHERE
           ((`v`.`nome_emp` LIKE '%ESB%')
               AND (`v`.`data_lancamento` BETWEEN DATE_FORMAT((NOW() - INTERVAL 12 MONTH), '%Y-%m-01') AND LAST_DAY((CURDATE() - INTERVAL 1 MONTH))))
       GROUP BY `v`.`ano` , `v`.`mes` UNION ALL SELECT 
           NULL AS `ELEGIVEL`,
               COUNT(0) AS `ADESAO`,
               `V_SEGUROS_ADESAO`.`Ano` AS `ano`,
               `V_SEGUROS_ADESAO`.`Mes` AS `mes`,
               'BENCH' AS `TIPO`
       FROM
           `V_SEGUROS_ADESAO`
       WHERE
           ((`V_SEGUROS_ADESAO`.`nome_emp` LIKE '%ESB%')
               AND (`V_SEGUROS_ADESAO`.`dataemissao` BETWEEN DATE_FORMAT((NOW() - INTERVAL 12 MONTH), '%Y-%m-01') AND LAST_DAY((CURDATE() - INTERVAL 1 MONTH))))
       GROUP BY `V_SEGUROS_ADESAO`.`Ano` , `V_SEGUROS_ADESAO`.`Mes` UNION ALL SELECT 
           SUM(`v`.`QuantidadeItem`) AS `ELEGIVEL`,
               NULL AS `ADESAO`,
               `v`.`ano` AS `ano`,
               `v`.`mes` AS `mes`,
               'BRAND' AS `TIPO`

       FROM
           `V_VENDAS_ELEGIVEIS` `v`
       WHERE
           (`v`.`data_lancamento` BETWEEN DATE_FORMAT((NOW() - INTERVAL 12 MONTH), '%Y-%m-01') AND LAST_DAY((CURDATE() - INTERVAL 1 MONTH)))
       GROUP BY `v`.`ano` , `v`.`mes` UNION ALL SELECT 
           NULL AS `ELEGIVEL`,
               COUNT(0) AS `ADESAO`,
               `V_SEGUROS_ADESAO`.`Ano` AS `ano`,
               `V_SEGUROS_ADESAO`.`Mes` AS `mes`,
               'BRAND' AS `TIPO`
       FROM
           `V_SEGUROS_ADESAO`
       WHERE
           (`V_SEGUROS_ADESAO`.`dataemissao` BETWEEN DATE_FORMAT((NOW() - INTERVAL 12 MONTH), '%Y-%m-01') AND LAST_DAY((CURDATE() - INTERVAL 1 MONTH)))
       GROUP BY `V_SEGUROS_ADESAO`.`Ano` , `V_SEGUROS_ADESAO`.`Mes`

) `CONV`

GROUP BY `CONV`.`ano` , `CONV`.`mes`, `CONV`.`TIPO`

如果像下面的代码那样每次将上面的查询拆分为一个查询，则结果很快。

SELECT 
       SUM(`BENCH`.`ELEGIVEL`) AS `ELEGIVEL`,
       SUM(`BENCH`.`ADESAO`) AS `ADESAO`,
       `BENCH`.`ano` AS `ano`,
       `BENCH`.`mes` AS `mes`,
       'BENCHMARK' AS `TIPO`
   FROM
       (SELECT 
           SUM(`v`.`QuantidadeItem`) AS `ELEGIVEL`,
               NULL AS `ADESAO`,
               `v`.`ano` AS `ano`,
               `v`.`mes` AS `mes`
       FROM
           `V_VENDAS_ELEGIVEIS` `v`
       WHERE
           ((`v`.`nome_emp` LIKE '%ESB%')
               AND (`v`.`data_lancamento` BETWEEN DATE_FORMAT((NOW() - INTERVAL 12 MONTH), '%Y-%m-01') AND LAST_DAY((CURDATE() - INTERVAL 1 MONTH))))
       GROUP BY `v`.`ano` , `v`.`mes` UNION ALL SELECT 
           NULL AS `ELEGIVEL`,
               COUNT(0) AS `ADESAO`,
               `V_SEGUROS_ADESAO`.`Ano` AS `ano`,
               `V_SEGUROS_ADESAO`.`Mes` AS `mes`
       FROM
           `V_SEGUROS_ADESAO`
       WHERE
           ((`V_SEGUROS_ADESAO`.`nome_emp` LIKE '%ESB%')
               AND (`V_SEGUROS_ADESAO`.`dataemissao` BETWEEN DATE_FORMAT((NOW() - INTERVAL 12 MONTH), '%Y-%m-01') AND LAST_DAY((CURDATE() - INTERVAL 1 MONTH))))
       GROUP BY `V_SEGUROS_ADESAO`.`Ano` , `V_SEGUROS_ADESAO`.`Mes`) `BENCH`
   GROUP BY `BENCH`.`ano` , `BENCH`.`mes`

该服务器基于AWS RDS。我没有更改任何参数组，它是default.mysql8.0参数。

这是一个db.t3.medium实例，它具有4Gb RAM

Answer 1

嵌套的SELECT语句在每个级别进行分组太复杂且效率低下。我强烈建议您将逻辑重新设计为存储过程，在其中可以使用临时表和更简单的命令的组合来一次收集数据。