解決ORA-00054資源正忙的問題

有時候在drop表或者其他對象的時候，會遇到ORA-00054:資源正忙，要求指定NOWAIT（中文字符集）或者ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired錯誤（英文字符集），Oracle官方解決方案：

ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired

Cause: Interested resource is busy.

Action: Retry if necessary or increase timeout.

通常處理方法有好幾個步驟：

• 查看數據庫中那些用戶產生了鎖

SQL> select username,sid,serial#,logon_time from v$locked_object,v$session where v$locked_object.session_id=v$session.sid;
USERNAME                              SID    SERIAL# LOGON_TIME
------------------------------ ---------- ---------- -----------
NEWCCS                               228        574 2010-7-6 17

• 根據SID查看具體的SQL語句

SQL> select sql_text from v$session,v$sqltext_with_newlines where decode(v$session.sql_hash_value,0,prev_hash_value,sql_hash_value)=v$sqltext_with_newlines.hash_value and v$session.sid=&sid order by piece;

• 如果短時間內此SQL語句無法完成，且急需重建索引，那么kill此session

SQL> alter system kill session '228,574';

以上步驟太過繁瑣，這里有一段代碼的解決方案：

BEGIN
FOR C IN (SELECT S.SID SID, S.SERIAL# SERIAL FROM V$LOCKED_OBJECT L, V$SESSION S WHERE L.SESSION_ID = S.SID) LOOP
   EXECUTE IMMEDIATE ('ALTER SYSTEM KILL SESSION ''' || C.SID || ',' || C.SERIAL || '''');
END LOOP;
END;