Question

我有两个表结构如下:(系统中每个对象类型的多个ai_ $对象表）

       ai_$object         ,       ai_ext_ids
--------------------        -------------------------- 
ext_id | hash                    id | ext_id | object_name | sfID

从批量删除我得到了sf_ids，并且需要从这两个表中删除记录，这种删除最愚蠢的方式是这样的：

在伪代码中 - ＆gt;

$idToBeDeleted = SELECT ext_id FROM ai_tr_tbl_extids WHERE objectName='$object' AND sfID ='$s'" ;

DELETE FROM ai_tr_tbl_extids WHERE objectName='$object' AND sfID ='$s';

DELETE FROM ai_$object WHERE ext_id='$idToBeDeleted';

我的问题是如何提高这部分的性能？这个代码在循环中运行，如果我用数组批量删除这个删除：SELECT * FROM table WHERE ID IN（1,2,3,4）

Answer 1

应该对objectName列建立索引以获得更好的性能。并尝试以下查询。

$idToBeDeleted = SELECT ext_id FROM ai_tr_tbl_extids WHERE objectName='$object' AND sfID ='$s'" ;

DELETE FROM ai_tr_tbl_extids WHERE ext_id='$idToBeDeleted';

DELETE FROM ai_$object WHERE ext_id='$idToBeDeleted';

但是，如果您能够删除要删除的ext_id列表，则可以删除该循环，只需使用IN删除。

DELETE FROM ai_tr_tbl_extids WHERE ext_id IN ($idToBeDeletedCommaSeparatedValue');

DELETE FROM ai_$object WHERE ext_id IN ($idToBeDeletedCommaSeparatedValue');

批量删除两个相关表的性能

1 个答案: