正在执行的SQL和之前执行的SQL

SQL> select * from v$mystat where rownum<2;

       SID STATISTIC#	   VALUE
---------- ---------- ----------
      1996	    0	       0

SQL> select count(*), USERNAME from v$session group by username;

  COUNT(*) USERNAME
---------- ------------------------------
	25
	13 CZCB
	 1 SYS
----之前执行的SQL
SQL> select sql_text
  from v$sqlarea
 where (address, hash_value) in
       (select prev_sql_addr, prev_hash_value
          from v$session
         where sid = '1996')
  2    3    4    5    6    7  ;

SQL_TEXT
--------------------------------------------------------------------------------
select count(*), USERNAME from v$session group by username

----正在执行的SQL
  SQL>   select sql_text
          from v$sqlarea
         where (address, hash_value) in
               (select SQL_ADDRESS, SQL_HASH_VALUE
                  from v$session
                 where sid = '1996');  2    3    4    5    6  

no rows selected

 测试2:
SQL> select count(*) from T_PM_ACCT_DTL_AF;
SQL>  select sql_text
  from v$sqlarea
 where (address, hash_value) in
       (select prev_sql_addr, prev_hash_value
          from v$session
         where sid = '1996')
  2    3    4    5    6    7  ;

SQL_TEXT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  select sql_text	    from v$sqlarea	    where (address, hash_value) in		  (select SQL_ADDRESS, SQL_HASH_VALUE			from v$session			where sid = '199
6')

SQL> select sql_text
          from v$sqlarea
         where (address, hash_value) in
               (select SQL_ADDRESS, SQL_HASH_VALUE
                  from v$session
                 where sid = '1996');  2    3    4    5    6  

SQL_TEXT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
select count(*) from T_PM_ACCT_DTL_AF