oracle 經常使用語句

-- 空表不導出，創建表空間
select 'alter table '||table_name||' allocate extent;' from user_tables where num_rows=0

-- 查詢鎖表
select b.username,b.sid,b.serial#,logon_time from v$locked_object a,v$session b where a.session_id = b.sid order by b.logon_time;
-- 殺死鎖表進程
select 'alter system kill session '''||b.sid||','||b.serial#||''';' from v$locked_object a,v$session b where a.session_id = b.sid order by b.logon_time;