Re: What's the prefix?

use these sqls:

create table t(a text);

insert into t values('a');

select lp,lp_len,t_data from heap_page_items(get_raw_page('t',0));

lp | lp_len | t_data 

----+--------+--------

  1 |     26 | \x0561

as you can see, the 61 is 'a', so what's the 05??? strange.