關於oracle後臺啟用的schedule job（r2筆記65天)

阿新 • • 發佈：2022-05-04

在昨天晚上10點開始，資料庫的效能開始下降，出現了一些j00開頭的程序。而且持續了比較長的時間，簡單分析了一下，對應的程序執行的sql語句如下。

####### Process Information from OS level as below ########
oraccbs1 16184     1 23 22:00 ?        00:03:09 ora_j000_PETCUS1
oraccbs1 20829 12754  0 22:14 pts/12   00:00:00 ksh showpid.sh 16184
##############################################
       SID    SERIAL# USERNAME        OSUSER          MACHINE              PROCESS         TERMINAL        TYPE       LOGIN_TIME
---------- ---------- --------------- --------------- -------------------- --------------- --------------- ---------- -------------------
      1139       1071 SYS             oraccbs1        xxxxxx               16184           UNKNOWN         USER       2014-08-14 22:00:43
.
SQL_ID                         SQL_TEXT
------------------------------ ------------------------------------------------------------
6fwshkjydz9ph                  /* SQL Analyze(1) */ select /*+  full(t)    no_parallel(t) n
                               o_parallel_index(t) dbms_stats cursor_sharing_exact use_weak
                               _name_resl dynamic_sampling(0) no_monitoring no_substrb_pad
                                */to_char(count("PERIOD_KEY")),to_char(substrb(dump(min("PE
                               RIOD_KEY"),16,0,32),1,120)),to_char(substrb(dump(max("PERIOD
                               _KEY"),16,0,32),1,120)),to_char(count("PARTITION_ID")),to_ch
                               ar(substrb(dump(min("PARTITION_ID"),16,0,32),1,120)),to_char
                               (substrb(dump(max("PARTITION_ID"),16,0,32),1,120)),to_char(c
                               ount("DEBIT_ID")),to_char(substrb(dump(min("DEBIT_ID"),16,0,
                               32),1,120)),to_char(substrb(dump(max("DEBIT_ID"),16,0,32),1,
                               120)),to_char(count("SYS_CREATION_DATE")),to_char(substrb(du
                               mp(min("SYS_CREATION_DATE"),16,0,32),1,120)),to_char(substrb
                               (dump(max("SYS_CREATION_DATE"),16,0,32),1,120)),to_char(coun
                               t("SYS_UPDATE_DATE")),to_char(substrb(dump(min("SYS_UPDATE_D
                               ATE"),16,0,32),1,120)),to_char(substrb(dump(max("SYS_UPDATE_
                               DATE"),16,0,32),1,120)),to_char(count("OPERATOR_ID")),to_cha
                               r(substrb(dump(min("OPERATOR_ID"),16,0,3
PREV_SQL_ID                    SQL_TEXT
------------------------------ ------------------------------------------------------------
fhzj09a7fnrnb                  SELECT DBTIMEZONE, LENGTH(DBTIMEZONE) FROM SYS.DUAL

看起來是在做一些後臺的維護工作。在11g中引入了幾個schedule job，簡單查詢，結果如下。可以看到在每天都設定了對應的window。在10點開始做一些工作。以下是禁用以後的狀態。

SQL> execute DBMS_AUTO_TASK_ADMIN.DISABLE;
PL/SQL procedure successfully completed.
SQL> select * from DBA_AUTOTASK_WINDOW_CLIENTS;
WINDOW_NAME                    WINDOW_NEXT_TIME                                                            WINDO AUTOTASK OPTIMIZE SEGMENT_ SQL_TUNE HEALTH_M
------------------------------ --------------------------------------------------------------------------- ----- -------- -------- -------- -------- --------
MONDAY_WINDOW                  18-AUG-14 10.00.00.000000 PM ASIA/PHNOM_PENH                                FALSE DISABLED ENABLED  ENABLED  ENABLED  DISABLED
TUESDAY_WINDOW                 19-AUG-14 10.00.00.000000 PM ASIA/PHNOM_PENH                                FALSE DISABLED ENABLED  ENABLED  ENABLED  DISABLED
WEDNESDAY_WINDOW               20-AUG-14 10.00.00.000000 PM ASIA/PHNOM_PENH                                FALSE DISABLED ENABLED  ENABLED  ENABLED  DISABLED
THURSDAY_WINDOW                14-AUG-14 10.00.00.000000 PM ASIA/PHNOM_PENH                                TRUE  DISABLED ENABLED  ENABLED  ENABLED  DISABLED
FRIDAY_WINDOW                  15-AUG-14 10.00.00.000000 PM ASIA/PHNOM_PENH                                FALSE DISABLED ENABLED  ENABLED  ENABLED  DISABLED
SATURDAY_WINDOW                16-AUG-14 06.00.00.000000 AM ASIA/PHNOM_PENH                                FALSE DISABLED ENABLED  ENABLED  ENABLED  DISABLED
SUNDAY_WINDOW                  17-AUG-14 06.00.00.000000 AM ASIA/PHNOM_PENH                                FALSE DISABLED ENABLED  ENABLED  ENABLED  DISABLED
7 rows selected.

其實3個主要的後臺job可以選擇關掉。

SQL> select client_name,status from DBA_AUTOTASK_CLIENT;

CLIENT_NAME                                                      STATUS
---------------------------------------------------------------- --------
auto optimizer stats collection                                  ENABLED
auto space advisor                                               ENABLED
sql tuning advisor                                               ENABLED

使用如下的pl/sql來禁用。

begin 
DBMS_AUTO_TASK_ADMIN.DISABLE(client_name => 'auto optimizer stats collection', 
operation => NULL, 
window_name => NULL); 
end; 
/

begin 
DBMS_AUTO_TASK_ADMIN.DISABLE(client_name => 'auto space advisor', 
operation => NULL, 
window_name => NULL); 
end; 
/
begin 
DBMS_AUTO_TASK_ADMIN.DISABLE(client_name => 'sql tuning advisor', 
operation => NULL, 
window_name => NULL); 
end; 
/

禁用以後，狀態如下：

SQL> select client_name,status from DBA_AUTOTASK_CLIENT;
CLIENT_NAME                                                      STATUS
---------------------------------------------------------------- --------
auto optimizer stats collection                                  DISABLED
auto space advisor                                               DISABLED
sql tuning advisor                                               DISABLED

但是不會當時生效，需要過一段時間，所以需要提前禁用。