Hello Developers, Hi this is sachin.Actually i was currently experimenting with with blob uniques in innodb there is three main problems 1.Unique blob 2.Blob Forigen key 3.Blob primary key 1. For blob unique we can simply store hash in unclustered index 2. Blob Forigen key i am currently working on it 3. Blob primary key :- for this i thought we create a 4 byte column which stores the hash of blob primary key.Internally this column will work as primary key and key for clustered index. I already successufully tested this here is my output MariaDB [sachin]> create table t4 (abc blob primary key); Query OK, 0 rows affected (0.10 sec) MariaDB [sachin]> insert into t4 values('sachin'); Query OK, 1 row affected (0.01 sec) MariaDB [sachin]> insert into t4 values('sachin'); ERROR 1062 (23000): Duplicate entry 'sachin' for key 'PRIMARY' MariaDB [sachin]> insert into t4 values('sachin setiya'); Query OK, 1 row affected (0.00 sec) MariaDB [sachin]> insert into t4 values('sachin setiya'); ERROR 1062 (23000): Duplicate entry 'sachin setiya' for key 'PRIMARY' MariaDB [sachin]> desc t4; +-------+------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+------+------+-----+---------+-------+ | abc | blob | NO | PRI | NULL | | +-------+------+------+-----+---------+-------+ 1 row in set (0.01 sec) MariaDB [sachin]> select * from t4; +---------------+ | abc | +---------------+ | sachin | | sachin setiya | +---------------+ 2 rows in set (0.01 sec) @Sergei hi! Actually i invested arround 2 months in mariadb So for me now it does not matter either i got selected in gsoc i want to do work in innodb blob unique from today.Please sir allow me to do this I am including the patch file and t4.ibd and t4.frm file Regards sachin