1set global innodb_file_per_table=1;
2CREATE TABLE ref_table1 (id int(11) NOT NULL, PRIMARY KEY(id)) ENGINE=InnoDB;
3CREATE TABLE ref_table2 (id int(11) NOT NULL, PRIMARY KEY(id)) ENGINE=InnoDB;
4CREATE TABLE `main` (
5`id` int(11) NOT NULL AUTO_INCREMENT,
6`ref_id1` int(11) NOT NULL,
7`ref_id2` int(11) NOT NULL,
8PRIMARY KEY (`id`),
9UNIQUE KEY `idx_1` (`ref_id1`,`ref_id2`),
10KEY `FK_set_out_analysis_route_id` (`ref_id2`),
11CONSTRAINT `FK_1` FOREIGN KEY (`ref_id1`) REFERENCES `ref_table1` (`id`) ,
12CONSTRAINT `FK_2` FOREIGN KEY (`ref_id2`) REFERENCES `ref_table2` (`id`)
13) ENGINE=InnoDB;
14SET FOREIGN_KEY_CHECKS=0;
15DROP INDEX `idx_1` ON `main`;
16SHOW TABLES;
17Tables_in_test
18main
19ref_table1
20ref_table2
21# restart
22ALTER TABLE `main` ADD INDEX `idx_1` (`ref_id1`);
23SHOW CREATE TABLE `main`;
24Table	Create Table
25main	CREATE TABLE `main` (
26  `id` int(11) NOT NULL AUTO_INCREMENT,
27  `ref_id1` int(11) NOT NULL,
28  `ref_id2` int(11) NOT NULL,
29  PRIMARY KEY (`id`),
30  KEY `FK_set_out_analysis_route_id` (`ref_id2`),
31  KEY `idx_1` (`ref_id1`),
32  CONSTRAINT `FK_1` FOREIGN KEY (`ref_id1`) REFERENCES `ref_table1` (`id`),
33  CONSTRAINT `FK_2` FOREIGN KEY (`ref_id2`) REFERENCES `ref_table2` (`id`)
34) ENGINE=InnoDB DEFAULT CHARSET=latin1
35DROP TABLE  main, ref_table1, ref_table2;
36