ZT:字元長度與共享問題

http://tkyte.blogspot.com/2007/04/share-and-share-alike.html

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create table t ( x varchar2(2000) );

declare
a varchar2(1) := 'x';
b varchar2(100) := rpad('x',100,'x');
c varchar2(500) := rpad('x',500,'x');
d varchar2(1000) := rpad('x',1000,'x');
begin
insert into t big_to_small values(d);
insert into t big_to_small values(c);
insert into t big_to_small values(b);
insert into t big_to_small values(a);
insert into t small_to_big values(a);
insert into t small_to_big values(b);
insert into t small_to_big values(c);
insert into t small_to_big values(d);
end;

column sql_text format a45
column address new_val ADDR
select sql_text, address, child_address
from v$sql
where sql_text like 'INSERT%INTO%T%VALUES(%:B1%)'
/

SQL_TEXT ADDRESS CHILD_ADDRESS
--------------------------------------------- ---------------- ----------------
INSERT INTO T BIG_TO_SMALL VALUES(:B1 ) 00000000CABA0820 00000000CAC197D8
INSERT INTO T SMALL_TO_BIG VALUES(:B1 ) 00000000CA7F9300 00000000D16A97A0
INSERT INTO T SMALL_TO_BIG VALUES(:B1 ) 00000000CA7F9300 00000000D1A477A0
INSERT INTO T SMALL_TO_BIG VALUES(:B1 ) 00000000CA7F9300 00000000D155C0B8