ORA-04021，timeout occurred while waiting to lock object

SQL> create or replace procedure binzhang_t is
  2  begin                                    
  3  dbms_output.put_line('hello');           
  4  dbms_lock.sleep(12000);                  
  5  end;                                     
  6  /                                        

Procedure created.

 

SQL> create or replace procedure binzhang_t is
  2  begin                                    
  3  dbms_output.put_line('hello');           
  4  dbms_lock.sleep(12000);                  
  5  end;                                     
  6  /                                        
create or replace procedure binzhang_t is
*
ERROR at line 1:
ORA-04021: timeout occurred while waiting to lock object

Elapsed: 00:15:00.00

 

SQL> select event,SECONDS_IN_WAIT from v$session_wait where wait_class<>'Idle';

EVENT                          SECONDS_IN_WAIT
------------------------------ ---------------
SQL*Net message to client                    0
library cache pin                          100
SQL*Net more data from dblink          1196934
SQL*Net message to client                    0

网络上有人说是5分钟，我实验了下大约是15分钟。

而且这个错误的提示，timeout occurred while waiting to lock object，比较让人误解是在获取library cache lock的时候发生的，其实根据实验看出pin也一样会发生。

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转载于:http://blog.itpub.net/22034023/viewspace-687249/