一次pga 異常消耗分析

一次pga 異常消耗分析

os： aix 6

db：10205

------使用os 命令觀察oracle 進程記憶體消耗情況
#ps gv
......                                                    size
23396516      - A    14907:02 5203  14324376 2058800    xx 90815 38576  2.0  3.0 oracle
23396516      - A    14907:02 5203  14324376 2058800    xx 90815 38576  2.0  3.0 oracle
57540768      - A    3711:33 8331   15108164 15146740    xx 90815 38576  1.9 23.0 oracle
16318890      - A    10639:03  187  15110924 15009560    xx 90815 38576  2.0 23.0 oracle
33554712      - A    17263:24 13740 9598740 185552      xx 90815 38576  2.1  0.0 oracle
41877820      - A    10492:10  826  15110484 15018716    xx 90815 38576  2.0 23.0 oracle
..............

單個進程消耗近15g 明顯有問題啊

AIX/LINUX 如何查看單個進程在os層面的記憶體消耗        http://blog.csdn.net/lixora/article/details/24060299

這裡提供其他查看進程記憶體大方法

----查看對應oracle的應用進程記憶體消耗情況
select p.username,p.spid,p.program,pm.category,pm.used,pm.allocated,pm.max_allocated
    from v$process p ,v$process_memory pm；
    -----where p.pid=pm.pid and program like '%TNS%';

41877820 :
USERNAME        SPID         PROGRAM                                          CATEGORY              USED  ALLOCATED MAX_ALLOCATED
--------------- ------------ ------------------------------------------------ --------------- ---------- ---------- -------------
oracle          41877820     oracle@sssdb                                    SQL             1.3077E+10 1.3081E+10    1.3081E+10
oracle          41877820     oracle@sssdb                                    PL/SQL                 224       2008          2008
oracle          41877820     oracle@sssdb                                    Other                      2178876745    2178876745

33554712:
USERNAME        SPID         PROGRAM                                          CATEGORY              USED  ALLOCATED MAX_ALLOCATED
--------------- ------------ ------------------------------------------------ --------------- ---------- ---------- -------------
oracle          33554712     oracle@sssdb                                    SQL             5380315176 5382747784    5382747784
oracle          33554712     oracle@sssdb                                    PL/SQL               26240      31224         37560
oracle          33554712     oracle@sssdb                                    Other                      4398399145    4398399145

USERNAME        SPID         PROGRAM                                          CATEGORY              USED  ALLOCATED MAX_ALLOCATED
--------------- ------------ ------------------------------------------------ --------------- ---------- ---------- -------------
oracle          16318890     oracle@sssdb                                    SQL             1.3066E+10 1.3070E+10    1.3070E+10
oracle          16318890     oracle@sssdb                                    PL/SQL                 224       2008          2008
oracle          16318890     oracle@sssdb                                    Other                      2185355529    2185355529

USERNAME        SPID         PROGRAM                                          CATEGORY              USED  ALLOCATED MAX_ALLOCATED
--------------- ------------ ------------------------------------------------ --------------- ---------- ---------- -------------
oracle          57540768     oracle@sssdb                                    SQL             1.3291E+10 1.3294E+10    1.3294E+10
oracle          57540768     oracle@sssdb                                    PL/SQL                 224       2008          2008
oracle          57540768     oracle@sssdb                                    Other                      2093690553    2093690553

USERNAME        SPID         PROGRAM                                          CATEGORY              USED  ALLOCATED MAX_ALLOCATED
--------------- ------------ ------------------------------------------------ --------------- ---------- ---------- -------------
oracle          23396516     oracle@sssdb                                    SQL             1.1608E+10 1.1611E+10    1.1611E+10
oracle          23396516     oracle@sssdb                                    PL/SQL                 224       2008          2008
oracle          23396516     oracle@sssdb                                    Other                      2769131497    2769131497

大部分記憶體花銷在sql 上

select program, MODULE, TERMINAL  , MACHINE from v$session where paddr in (select addr from v$process  where spid in(23396516,57540768,33554712,16318890 ,41877820));

----確定相應的應用
SQL> select program, MODULE, TERMINAL  , MACHINE from v$session where paddr in (select addr from v$process where spid in(23396516,57540768,33554712,16318890 ,41877820));
 
PROGRAM        MODULE         TERMINAL             MACHINE
------------    -------------   ----------------- ----------------
xxx.exe        xxx.exe      sfd       DC9A29A
xxx.exe        xxx.exe     sdf72172       WOR722C72172
xxx.exe        xxx.exe      GR5FD       WORKG-4715FD
xxx.exe        xxx.exe      FSK051             WOBG051
xxx.exe        xxx.exe      CD3LVB0U      MSVWCVB0U

---------這裡繼續跟蹤相應應用的session 來確定這個應用中到底是那些操作造成了如此大的記憶體開銷
1、找出應用的sid和serial#

SQL> select sid,serial# from v$session where lower(program) like '%isap_client%';

       SID    SERIAL#
---------- ----------
        78       1703

2、開始跟蹤

SQL> exec sys.DBMS_SYSTEM.set_sql_trace_in_session(78,1703,true);

PL/SQL procedure successfully completed.

3、期間做點關於這個應用的操作（保證和資料庫能有互動）

4、停止跟蹤，在user_dump_dest目錄下會產生跟蹤的trace檔案

SQL> exec sys.DBMS_SYSTEM.set_sql_trace_in_session(78,1703,false);

PL/SQL procedure successfully completed.

5、找出並進入user_dump_dest目錄，最後產生那個檔案就是要用的trace檔案

SQL> set lines 1024
SQL> show parameter user_dump_dest

NAME                                 TYPE                             VALUE
------------------------------------ -------------------------------- ------------------------------
user_dump_dest                       string                           /opt/oracle/db01/app/oracle/ad
                                                                      min/ORCL/udump
SQL> exit

$ cd /opt/oracle/db01/app/oracle/admin/ORCL/udump
$ ls -otr | tail -1
-rw-r-----   1 oracle    576097 Jan 8 16:15 orcl_ora_24884.trc
$

6、使用tkprof格式化trace檔案，sys=no的意思是不查看sys使用者的操作，看了也沒啥用

$ tkprof orcl_ora_24884.trc report.txt sys=no

TKPROF: Release 9.2.0.4.0 - Production on Tue Jan 8 16:19:35 2008

Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.

$

7、查看格式化後的檔案report.txt，裡頭就有跟蹤期間發生的所有預存程序（預存程序中執行的sql操作也會逐條顯示）和sql操作，還有各sql執行的統計資料，可以瞭解哪些sql快，哪些慢了

$ more report.txt