CBO????????
- by Liu Maclean(???)
???Itpub????????CBO??????????, ????????:
SQL> create table maclean1 as select * from dba_objects;
Table created.
SQL> update maclean1 set status='INVALID' where owner='MACLEAN';
2 rows updated.
SQL> commit;
Commit complete.
SQL> create index ind_maclean1 on maclean1(status);
Index…
