Bitmap index block concurrence

test@ORCL>create table t(processed_flag varchar2(1));

Table created.

 

test@ORCL>create bitmap index t_idx on t(processed_flag);

Index created.

 

Create a bitmap index on table t;

 

test@ORCL>insert into t values('N');

1 row created.

 

Insert value 'N' into table t at one session,do not commit;

 

 

 

test@ORCL>insert into t values('N');

 

At the second session,insert value 'N' ,transaction will be blocked.