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create table t1(a blob unique) engine= InnoDB;
insert into t1 values('RUC');
insert into t1 values ('RUC');
ERROR 23000: Duplicate entry 'RUC' for key 'a'
show keys from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 0 a 1 a A 1 NULL NULL YES HASH NO
drop table t1;
create table t1 (a blob unique , c int unique) engine=innodb;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` blob DEFAULT NULL,
`c` int(11) DEFAULT NULL,
UNIQUE KEY `c` (`c`),
UNIQUE KEY `a` (`a`) USING HASH
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci
drop table t1;
#test for concurrent insert of long unique in innodb
create table t1(a blob unique) engine= InnoDB;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` blob DEFAULT NULL,
UNIQUE KEY `a` (`a`) USING HASH
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci
connect 'con1', localhost, root,,;
connect 'con2', localhost, root,,;
connection con1;
set innodb_lock_wait_timeout= 2;
set transaction isolation level READ UNCOMMITTED;
start transaction;
insert into t1 values('RUC');
connection con2;
set innodb_lock_wait_timeout= 2;
set transaction isolation level READ UNCOMMITTED;
start transaction;
insert into t1 values ('RUC');
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
connection con1;
commit;
set transaction isolation level READ COMMITTED;
start transaction;
insert into t1 values('RC');
connection con2;
commit;
set transaction isolation level READ COMMITTED;
start transaction;
insert into t1 values ('RC');
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
commit;
connection con1;
commit;
set transaction isolation level REPEATABLE READ;
start transaction;
insert into t1 values('RR');
connection con2;
commit;
set transaction isolation level REPEATABLE READ;
start transaction;
insert into t1 values ('RR');
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
connection con1;
commit;
set transaction isolation level SERIALIZABLE;
start transaction;
insert into t1 values('S');
connection con2;
commit;
set transaction isolation level SERIALIZABLE;
start transaction;
insert into t1 values ('S');
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
commit;
connection con1;
commit;
select * from t1;
a
RUC
RC
RR
S
drop table t1;
create table t1(a blob unique) engine=Innodb;
connection con1;
set transaction isolation level READ UNCOMMITTED;
start transaction;
insert into t1 values('RUC');
connection con2;
set transaction isolation level READ UNCOMMITTED;
start transaction;
insert into t1 values ('RUC');;
connection con1;
rollback;
connection con2;
commit;
connection con1;
set transaction isolation level READ COMMITTED;
start transaction;
insert into t1 values('RC');
connection con2;
set transaction isolation level READ COMMITTED;
start transaction;
insert into t1 values ('RC');;
connection con1;
rollback;
connection con2;
commit;
connection con1;
set transaction isolation level REPEATABLE READ;
start transaction;
insert into t1 values('RR');
connection con2;
set transaction isolation level REPEATABLE READ;
start transaction;
insert into t1 values ('RR');;
connection con1;
rollback;
connection con2;
commit;
connection con1;
set transaction isolation level SERIALIZABLE;
start transaction;
insert into t1 values('S');
connection con2;
set transaction isolation level SERIALIZABLE;
start transaction;
insert into t1 values ('S');;
connection con1;
rollback;
connection con2;
commit;
connection default;
drop table t1;
disconnect con1;
disconnect con2;
# MDEV-20131 Assertion `!pk->has_virtual()' failed
create table t1 (a text, primary key(a(1871))) engine=innodb;
ERROR 42000: Specified key was too long; max key length is 1536 bytes
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