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
# End of 10 .4 tests
#
# MDEV-37268 ER_NOT_KEYFILE or assertion failure upon REPLACE into table with unique hash under READ-COMMITTED
#
create table t1 (id int not null primary key, f varchar(100 ), unique(f) using hash) engine=innodb;
insert t1 values (1 ,'x' );
set transaction isolation level read committed;
replace t1 values (2 ,'x' );
select * from t1;
id f
2 x
drop table t1;
create table t1 (id int, f longtext, primary key (id), unique(f)) engine=innodb partition by key (id) partitions 9 ;
insert t1 (id) values (1 ),(2 );
set transaction isolation level read committed;
update ignore t1 set f = 'x' ;
ERROR 42000 : UPDATE IGNORE in READ COMMITTED isolation mode of a table with a UNIQUE constraint USING HASH is not currently supported
select * from t1;
id f
1 NULL
2 NULL
drop table t1;
#
# MDEV-37310 Non-debug failing assertion node->pcur->rel_pos == BTR_PCUR_ON upon violating long unique under READ-COMMITTED
#
create table t1 (id int, f blob, unique(id,f)) engine=innodb partition by key(id) partitions 2 ;
insert t1 values (1 ,'foo' ),(2 ,'foo' );
set transaction isolation level read committed;
update ignore t1 set id = 2 ;
ERROR 42000 : UPDATE IGNORE in READ COMMITTED isolation mode of a table with a UNIQUE constraint USING HASH is not currently supported
select * from t1;
id f
1 foo
2 foo
drop table t1;
#
# MDEV-39846 UNIQUE BLOB contains duplicate records after ALTER IGNORE with READ COMMITTED
#
create table t1 (pk int primary key, b blob) engine=innodb;
insert into t1 values (1 ,'foo' ),(2 ,'foo' );
set transaction isolation level read committed;
alter ignore table t1 add unique (b);
select * from t1;
pk b
1 foo
drop table t1;
# End of 10 .6 tests
Messung V0.5 in Prozent C=25 H=100 G=72
¤ Dauer der Verarbeitung: 0.14 Sekunden
(vorverarbeitet am 2026-10-08)
¤
*© Formatika GbR, Deutschland