MySQL 5.6.14 Source Code Document
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innodb-index.inc
1 --eval create table t1(a int not null, b int, c char(10), d varchar(20), primary key (a)) engine = innodb default charset=$charset
2 insert into t1 values (1,1,'ab','ab'),(2,2,'ac','ac'),(3,2,'ad','ad'),(4,4,'afe','afe');
3 commit;
4 --error ER_DUP_ENTRY
5 alter table t1 add unique index (b);
6 insert into t1 values(8,9,'fff','fff');
7 select * from t1;
8 show create table t1;
9 alter table t1 add index (b);
10 insert into t1 values(10,10,'kkk','iii');
11 -- disable_query_log
12 -- disable_result_log
13 analyze table t1;
14 -- enable_result_log
15 -- enable_query_log
16 select * from t1;
17 select * from t1 force index(b) order by b;
18 explain select * from t1 force index(b) order by b;
19 show create table t1;
20 alter table t1 add unique index (c), add index (d);
21 insert into t1 values(11,11,'aaa','mmm');
22 -- disable_query_log
23 -- disable_result_log
24 analyze table t1;
25 -- enable_result_log
26 -- enable_query_log
27 select * from t1;
28 select * from t1 force index(b) order by b;
29 select * from t1 force index(c) order by c;
30 select * from t1 force index(d) order by d;
31 explain select * from t1 force index(b) order by b;
32 explain select * from t1 force index(c) order by c;
33 explain select * from t1 force index(d) order by d;
34 show create table t1;
35 check table t1;
36 drop table t1;