oracle internal events

oracle internal events:

introduction:(簡介)

有四種類型的events:

                immediate dumps

               conditional dumps

               trace dumps

               events that change database behaviour

每一個事件都有一個號跟oracle的錯誤信息是一樣的.如10046和ora-10046

每一個事件都有一個level,可以是以下:

              範圍1到10

              位標 0x01 0x02 0x04 0x08 0x10

              標識 0=off,1=on

              id號 對象id(object id),內存地址(memory address)

要注意的是,events在每一個版本之間都有所改變.有一些存在的事件可能存在爭議性或者已經不可用了,往往這些事件號會由新的事件所替代掉.也要注意在當前的版本中message file不一定可以反映出events.

很多events都會影響數據庫的行爲,一些測試events極有可能導致數據庫down掉.所以,在沒有oracle support的前提下,最好不要在pro系統上做events操作.dev系統上如果要做events最好先做個數據庫的全備份.

enabling events(enable事件)

events可以在instance一級enabled,主要是在init.ora文件中做操作:

        event=event trace name context forever, level level;

(紅色部分:event指事件號.level指定事件的級別)

  一次可以enable多個事件,可以用以下兩種方式:

1.  用一個冒號隔開

     event = "10248 trace name context forever, level 10:10249 trace name context forever, level 10"

2.  兩個events分開寫

    event="10248 trace name context forever, level 10"

    event="10249 trace name context forever, level 10"#一些版本的oracle，event要一樣的大小寫

events也可以在instance一級用alter system命令來enable:

      alter system set events event trace name context forever, level level;

　在instance一級用以下disable

      alter system set events event trace name context off;

  events也可以在session一級用alter session命令來enable:

      alter session set events event trace name context forever, level level;

  在session一級用以下命令disable:

alter session set events event trace name context off;

 events在其他的session用oradebug來enable:

 在一個process中實現enable:

      oradebug event event trace name context forever, level level

 在某個進程中enable:

      oradebug setorapid 8(pid進程號)

      oradebug event event trace name context forever, level level

 以下命令disable:

  oradebug event event trace name context off

在session中實現enable:

  oradebug session_event event trace name context forever, level level

在session中實現disable:

  oradebug session_event event trace name context off

events也可以用dbms_system.setev包來實現enable和disable

    (在做之前要先從v$session視圖中獲得sid和serial#)

用以下方式:execute dbms_system.set_ev(sid,serial#,event,level, )

如execute dbms_system.set_ev (9,29,10046,8,);

  要disable則將level改爲0,如: execute dbms_system.set_ev (9,29,10046,0,);

listing all events:(列出所有可用的events)

大部分的events number的範圍都在10000到10999.可以用以下命令dump出所有的信息

set serveroutput on

declare

   err_msg varchar2(120);

begin

   dbms_output.enable (1000000);

   for err_num in 10000..10999

   loop

    err_msg := sqlerrm (-err_num);

    if err_msg not like %message ||err_num|| not found% then

      dbms_output.put_line (err_msg);

    end if;

  end loop;

end;

/

在unix系統下message文件在底下目錄$oracle_home/rdbms/mesg/oraus.msg

在nt系統下message文件在底下目錄$oracle_home/rdbms/mesg/oraus.msg

listing enabled events(列出enabled events)

  用以下命令列出在當前session已經enabled events:

           set serveroutput on

           declare

               l_level number;

           begin

               for l_event in 10000..10999

               loop

                         dbms_system.read_ev (l_event,l_level);

                         if l_level > 0 then

                          dbms_output.put_line (event ||to_char (l_event)||

                               is set at level ||to_char (l_level));

                         end if;

                end loop;

              end;

             /

常用events的參考:(紅色的爲最常用的而且對dba比較有用的events)

event 10013 - monitor transaction recovery------在startup時跟蹤事務恢復

           alter session set events 10013 trace name context forever, level 1;

event 10015 - dump undo segment headers----在事務恢復後做dump回退段頭信息

           alter session set events 10015 trace name context forever, level 1;

event 10032 - dump sort statistics----dump排序的統計信息,level 10是最詳細的

            alter session set events 10032 trace name context forever, level 10;

event 10033 - dump sort intermediate run statistics—level 10(不明白)

              alter session set events 10033 trace name context forever, level 10;

event 10045 - trace free list management operations—跟蹤freelist

             alter session set events 10045 trace name context forever, level 1;

event 10046 - enable sql statement trace---跟蹤sql,有執行計劃,邦定變量和等待的統計信息,level 12最詳細

           alter session set events 10046 trace name context forever, level 12;

級別level參考如下圖:

 

level

action

1

print sql statements, execution plans and execution statistics

4

as level 1 plus bind variables

8

as level 1 plus wait statistics

12

as level 1 plus bind variables and wait statistics



event 10053 - dump optimizer decisions---在分析sql語句時,dump出優化器所做的選擇,級別level 1最詳細

            alter session set events 10053 trace name context forever, level 1;

參考level:

level

action

1

print statistics and computations

2

print computations only

event 10060 - dump predicates---(參考http://www.juliandyke.com/)

event 10065 - restrict library cache dump output for state object dumps-(參考http://www.juliandyke.com/)

event 10079 - dump sql*net statistics---dump sql*net的統計信息

            alter session set events 10079 trace name context forever, level 2;

event 10081 - trace high water mark changes—跟蹤hwm的改變

            alter session set events 10081 trace name context forever, level 1;

event 10104 - dump hash join statistics—dump hash join的統計信息,用level 10

             alter session set events 10104 trace name context forever, level 10;

event 10128 - dump partition pruning information—dump分區表信息

               alter session set events 10128 trace name context forever, level level;

  level參考

level

action

0x0001

dump pruning descriptor for each partitioned object

0x0002

dump partition iterators

0x0004

dump optimizer decisions about partition-wise joins

0x0008

dump rowid range scan pruning information

在9.0.1或者後面的版本,在level 2後還需要建立如下的表:

create table kkpap_pruning

(

partition_count number,

iterator varchar2(32),

partition_level varchar2(32),

order_pt varchar2(12),

call_time varchar2(12),

part# number,

subp# number,

abs# number

);

event 10200 - dump consistent reads---dump出一致讀的信息

          alter session set events 10200 trace name context forever, level 1;

event 10201 - dump consistent read undo application---(不明白)

           alter session set events 10201 trace name context forever, level 1;

event 10220 - dump changes to undo header—dump出undo頭信息的改變

           alter session set events 10220 trace name context forever, level 1;

event 10221 - dump undo changes—dump undo的改變

           alter session set events 10221 trace name context forever, level 7;

event 10224 - dump index block splits / deletes—dump索引塊的split和delete信息

          alter session set events 10224 trace name context forever, level 1;

event 10225 - dump changes to dictionary managed extents---dump出在row cache中,字典管理的extents的改變

           alter session set events 10225 trace name context forever, level 1;

event 10231--設置在做全表掃描時跳過損壞的數據塊（在做exp時，如果有壞塊，設置這個可以使exp導出時跳過壞塊，使得部分數據能可以使用）

         alter system set events 10231 trace name context forever,level 10;

event 10241 - dump remote sql execution—dump遠程sql語句的執行信息

          alter session set events 10241 trace name context forever, level 1;

event 10246 - trace pmon process---只能在init.ora中做,不能用alter system做

            event = "10246 trace name context forever, level 1"

event 10248 - trace dispatcher processes---在init.ora中做(9idump到udump目錄中)

            event = "10248 trace name context forever, level 10"

event 10249 - trace shared server (mts) processes---在init.ora中做(9idump到udump目錄中)

              event = "10249 trace name context forever, level 10"

event 10270 - debug shared cursors—(不明白)

event = "10270 trace name context forever, level 10"

event 10299 - debug prefetching---(參考http://www.juliandyke.com/)

            event = "10299 trace name context forever, level 1"

 

event 10357 - debug direct path---(參考http://www.juliandyke.com/)

           alter session set events 10357 trace name context forever, level 1;

event 10390 - dump parallel execution slave statistics--(參考http://www.juliandyke.com/)

            alter session set events 10390 trace name context forever, level level;

event 10391-dump parallel execution granule allocation---

                                 (參考http://www.juliandyke.com/)

             alter session set events 10391 trace name context forever, level level;

event 10393 - dump parallel execution statistics--(參考http://www.juliandyke.com/)

              alter session set events 10393 trace name context forever, level 1;

event 10500 - trace smon process--在init.ora中做

                event = "10500 trace name context forever, level 1"

event 10608 - trace bitmap index creation—跟蹤二位圖索引

             alter session set events 10608 trace name context forever, level 10;

event 10704 - trace enqueues—跟蹤隊列

            alter session set events 10704 trace name context forever, level 1;

event 10706 - trace global enqueue manipulation-(參考http://www.juliandyke.com/)

           alter session set events 10706 trace name context forever, level 1;

event 10708 - trace rac buffer cache—跟蹤rac的buffer cache

           alter session set events 10708 trace name context forever, level 10;

event 10710 - trace bitmap index access--(參考http://www.juliandyke.com/)

           alter session set events 10710 trace name context forever, level 1;

event 10711 - trace bitmap index merge operation—

            alter session set events 10711 trace name context forever, level 1;

event 10712 - trace bitmap index or operation—

           alter session set events 10712 trace name context forever, level 1;

event 10713 - trace bitmap index and operation—

          alter session set events 10713 trace name context forever, level 1;

event 10714 - trace bitmap index minus operation—

          alter session set events 10714 trace name context forever, level 1;

event 10715 - trace bitmap index conversion to rowids operation—

           alter session set events 10715 trace name context forever, level 1;

event 10716 - trace bitmap index compress/decompress—

           alter session set events 10716 trace name context forever, level 1;

event 10717 - trace bitmap index compaction—

             alter session set events 10717 trace name context forever, level 1;

event 10719 - trace bitmap index dml—

            alter session set events 10719 trace name context forever, level 1;

event 10730 - trace fine grained access predicates—

           alter session set events 10730 trace name context forever, level 1;

event 10731 - trace cursor statements—

             alter session set events 10731 trace name context forever, level level;

levels are:

level

action

1

print parent query and subquery

2

print subquery only

event 10928 - trace pl/sql execution—

          alter session set events 10928 trace name context forever, level 1;

event 10938 - dump pl/sql execution statistics—

          alter session set events 10938 trace name context forever, level 1;

 

一些其他的events：

alter session set events immediate trace name flush_cache;--flush the buffer cache