ORA-04021 timeout occurred while waiting to lock object

用户要求删除一个数据库的用户 GREENPASS，在删除的过程中，报错如下：

drop user GREENPASS * ERROR at line 1: ORA-04021: timeout occurred while waiting to lock object NEWDR.HNDR_SMS_LOG

处理过程

1. 首先查询NEWDR.HNDR_SMS_LOG，这是一个'PROCEDURE'；

2. 现在报错，不能对此对象进行锁定。

3. 看看什么会话在访问此对象：

select B.SID, b.USERNAME, b.MACHINE   FROM V$ACCESS A, V$SESSION B WHERE A.SID = B.SID    and a.OBJECT = 'HNDR_SMS_LOG'    and a.TYPE = 'PROCEDURE';

SID USERNAME     MACHINE ---------- ------------ -------------------        520 NEWDR        WORKGROUP\BONC02

4. 根据sid获取操作系统的进程号

select spid os_sid   from v$process where addr = (select paddr from v$session where sid = &oracle_sid);

old 3: where addr = (select paddr from v$session where sid = &oracle_sid) new   3:  where addr = (select paddr from v$session where sid = 520)

OS_SID ------------ 29360

5. 询问业务人员，可以直接杀掉进程

ps -ef|grep 29360 kill -9 29360

6. 重新尝试 SQL> drop user GREENPASS; 用户已丢弃

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sid 为 520 对应的语句 部分如下：

INSERT /*+ APPEND */                                                   INTO FACT_INFO_USER_BEFORE                                               (ACCT_MONTH,                                                            USER_NO,                                                               DEVICE_NUMBER,                                                         SERVICE_CODE,                                                          AREA_ID,                                                               CITY_ID,                                                               USER_DINNER,                                                           INNET_MONTH,                                                           AVG_ARPU,                                                              ACCT_ARPU,                                                             IS_ACCT,                                                               USER_TYPE,                                                             EXPIRE_MONTH)                                                         SELECT /*+ USE_HASH(A,B,C,D,E,F,G)*/                                    :B1,                                                                   C.USER_NO,                                                             C.DEVICE_NUMBER,                                                       C.TELE_TYPE,                                                           C.AREA_NO,                                                             C.CITY_NO,                                                             C.USER_DINNER,                                                         C.INNET_MONTH,                                                         A.AVG_FEE,                                                             B.ALL_FEE,                                                             NVL2(B.USER_NO, '1', '0'),                                             (CASE                                                                    WHEN F.CLUBMEM_LEVEL_SUB_CODE_LAST IN ('1', '2') AND                        F.CLUBMEM_LEVEL_SUB_CODE = '1' AND G.USER_NO IS NULL THEN          '1'                                                                   WHEN F.CLUBMEM_LEVEL_SUB_CODE_LAST IN ('1', '2') AND                        F.CLUBMEM_LEVEL_SUB_CODE = '2' AND G.USER_NO IS NULL THEN          '2'                                                                   WHEN F.CLUBMEM_LEVEL_SUB_CODE = '3' AND C.INNET_MONTH >= 4 AND              A.AVG_FEE >= D.HIGH_STANDARD AND G.USER_NO IS NULL THEN            '3'                                                                   WHEN C.INNET_MONTH >= 4 AND A.AVG_FEE >= D.HIGH_STANDARD AND                G.USER_NO IS NULL THEN                                             '4'                                                                   WHEN C.INNET_MONTH >= 4 AND A.AVG_FEE < D.HIGH_STANDARD AND                 A.AVG_FEE >= D.HIGH_STANDARD * 0.8 AND E.USER_TYPE <= '5' AND           G.USER_NO IS NULL THEN                                             '5'                                                                   WHEN C.INNET_MONTH >= 4 AND A.AVG_FEE < D.HIGH_STANDARD AND                 A.AVG_FEE >= D.HIGH_STANDARD * 0.8 AND E.USER_TYPE > '5' THEN       '6'                                                                   WHEN C.INNET_MONTH >= 4 AND A.AVG_FEE < D.HIGH_STANDARD * 0.8 AND           A.AVG_FEE >= 30 THEN                                               '6'