About export database

Question

Hi Guys,
If I want to export just two table into file from database, do I need to kill all other connection? Like make database single?
Can I use oracle sqldeveloper to develop stored procedure? Thanks.

Answer 1

Actually it's opposite, when you use hint in query, that usually means optimizer is using CBOWhy opposite ? When you're in RULE mode, you can use HINT...
SQL> alter session set optimizer_mode='RULE'
SQL> /
Session altered.
SQL> set autot traceonly explain
SQL> select * from myobjects;
Execution Plan
   0      SELECT STATEMENT Optimizer=RULE
   1    0   TABLE ACCESS (FULL) OF 'MYOBJECTS'
SQL> select[b] /*+ ALL_ROWS */ * from myobjects
SQL> /
Execution Plan
   0      SELECT STATEMENT Optimizer=HINT: ALL_ROWS (Cost=58 Card=2000 Bytes=256000)
   1    0   TABLE ACCESS (FULL) OF 'MYOBJECTS' (Cost=58 Card=2000 Bytes=256000)
SQL> Nicolas.