[20170410]快速找回触发器内容.txt

--上午登录发现一个是触发器被人为删除了,需要恢复.链接http://www.itpub.net/thread-2084789-1-1.html.
--我提供几个方法:1.取出备份的system数据文件,通过bbed之类的工具定位.2使用logminer 应该也可以定位,表sys.source$.

--实际上还有1个简单粗暴的方法,直接通过strings查询归档日志.例子如下:

1.环境:
SYS@book> @ &r/ver1
PORT_STRING                    VERSION        BANNER
------------------------------ -------------- --------------------------------------------------------------------------------
x86_64/Linux 2.4.xx            11.2.0.4.0     Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

--//我的测试环境很早建立的一个函数.
CREATE OR REPLACE function SCOTT.p2p_distance(
            p_latitude1 number,
            p_longitude1 number,
            p_latitude2 number,
            p_longitude2 number) return number deterministic is
  earth_radius  number := 6371;
  pi_approx     number := 3.1415197/180;
  lat_delta     number := (p_latitude2-p_latitude1)*pi_approx;
  lon_delta     number := (p_longitude2-p_longitude1)*pi_approx;
  arc           number := sin(lat_delta/2) * sin(lat_delta/2) +
                               sin(lon_delta/2) * sin(lon_delta/2) * cos(p_latitude1*pi_approx) * cos(p_latitude2*pi_approx);
begin
  return earth_radius * 2 * atan2(sqrt(arc), sqrt(1-arc));
end;
/

2.删除它,恢复看看.
SYS@book> @ &r/logfile
GROUP# STATUS TYPE       MEMBER                          IS_ GROUP# THREAD# SEQUENCE#       BYTES BLOCKSIZE MEMBERS ARC STATUS     FIRST_CHANGE# FIRST_TIME          NEXT_CHANGE# NEXT_TIME
------ ------ ---------- ------------------------------- --- ------ ------- --------- ----------- --------- ------- --- ---------- ------------- ------------------- ------------ -------------------
     1        ONLINE     /mnt/ramdisk/book/redo01.log    NO       1       1       815    52428800       512       1 YES INACTIVE     13277272313 2017-04-08 16:00:41  13277278586 2017-04-10 08:43:12
     2        ONLINE     /mnt/ramdisk/book/redo02.log    NO       2       1       816    52428800       512       1 YES INACTIVE     13277278586 2017-04-10 08:43:12  13277278900 2017-04-10 08:43:16
     3        ONLINE     /mnt/ramdisk/book/redo03.log    NO       3       1       817    52428800       512       1 NO  CURRENT      13277278900 2017-04-10 08:43:16 2.814750E+14
     4        STANDBY    /mnt/ramdisk/book/redostb01.log NO
     5        STANDBY    /mnt/ramdisk/book/redostb02.log NO
     6        STANDBY    /mnt/ramdisk/book/redostb03.log NO
     7        STANDBY    /mnt/ramdisk/book/redostb04.log NO
7 rows selected.

--//当前在线日志/mnt/ramdisk/book/redo03.log .

SYS@book> drop function SCOTT.p2p_distance;
Function dropped.

SYS@book> alter system checkpoint ;
System altered.

SYS@book> alter system checkpoint ;
System altered.

SYS@book> alter system checkpoint ;
System altered.
--//保证脏块写盘.

$ strings -3 /mnt/ramdisk/book/redo03.log > /tmp/aaa.txt

drop function SCOTT.p2p_distance
SCOTT
P2P_DISTANCE
ORA$BASE.,
YYYY-MM-DD HH24:MI:SS
YYYY-MM-DD HH24:MI:SS.FFHH.MI.SSXFF AM
HH.MI.SSXFF AM TZR
YYYY-MM-DD HH24:MI:SS.FF TZH:TZMAMERICANAMERICANGREGORIAN
BINARY
BINARY
AMERICA
AMERICA
BYTEFALSE
    _H--------------------------------------
function p2p_distance(
            p_latitude1 number,
            p_longitude1 number,
            p_latitude2 number,
            p_longitude2 number) return number deterministic is
  earth_radius  number := 6371;
  pi_approx     number := 3.1415197/180;
  la
t_delta     number := (p_latitude2-p_latitude1)*pi_approx;
  lon_delta     number := (p_longitude2-p_longitude1)*pi_approx;
  arc           number := sin(lat_delta/2) * sin(lat_delta/2) +
                               sin(lon_delta
6/2) * sin(lon_delta/2) * cos(p_latitude1*pi_approx) * cos(p_latitude2*pi_approx);
~~
begin
  return earth_radius * 2 * atan2(sqrt(arc), sqrt(1-arc));
end;
U7^M

--//ok,里面就有内容.改写一下就ok了:(注有一点点小错误,里面多了1个6,注意看下划线)
CREATE OR REPLACE function SCOTT.p2p_distance(
            p_latitude1 number,
            p_longitude1 number,
            p_latitude2 number,
            p_longitude2 number) return number deterministic is
  earth_radius  number := 6371;
  pi_approx     number := 3.1415197/180;
  lat_delta     number := (p_latitude2-p_latitude1)*pi_approx;
  lon_delta     number := (p_longitude2-p_longitude1)*pi_approx;
  arc           number := sin(lat_delta/2) * sin(lat_delta/2) +
                               sin(lon_delta/2) * sin(lon_delta/2) * cos(p_latitude1*pi_approx) * cos(p_latitude2*pi_approx);
begin
  return earth_radius * 2 * atan2(sqrt(arc), sqrt(1-arc));
end;
/

--//在引申一点,实际上你可以直接扫描system01.dbf文件找到对应的内容.正常业务数据库一般不会有大量的dml对于sys.source$表.

SYS@book> column PARTITION_NAME noprint
SYS@book> select * from (select * from dba_extents where segment_name='SOURCE$' order by block_id desc) where rownum=1;
OWNER  SEGMENT_NAME         SEGMENT_TYPE       TABLESPACE_NAME                 EXTENT_ID    FILE_ID   BLOCK_ID      BYTES     BLOCKS RELATIVE_FNO
------ -------------------- ------------------ ------------------------------ ---------- ---------- ---------- ---------- ---------- ------------
SYS    SOURCE$              TABLE              SYSTEM                                 79          1      91520    8388608       1024            1

--//最后1块在91520.占用1024块.
SYS@book> select (91520+1024-1)*8192 from dual ;
(91520+1024-1)*8192
-------------------
          758112256

--//91520+1024=92544

$ dd if=/mnt/ramdisk/book/system01.dbf bs=8192 count=92544 | strings -3 > /tmp/bbb.txt
92544+0 records in
92544+0 records out
758120448 bytes (758 MB) copied, 11.8657 seconds, 63.9 MB/s

--//查询可以找到如下:

function p2p_distance(
    _H
             p_latitude1 number,
    _H
!            p_longitude1 number,
    _H
             p_latitude2 number,
    _H
@            p_longitude2 number) return number deterministic is
    _H
   earth_radius  number := 6371;
    _H
)  pi_approx     number := 3.1415197/180;
    _H
    ?  lat_delta     number := (p_latitude2-p_latitude1)*pi_approx;
    _H
A  lon_delta     number := (p_longitude2-p_longitude1)*pi_approx;
    _H
@  arc           number := sin(lat_delta/2) * sin(lat_delta/2) +
    _H
~                               sin(lon_delta/2) * sin(lon_delta/2) * cos(p_latitude1*pi_approx) * cos(p_latitude2*pi_approx);
    _H
begin
    _H
;  return earth_radius * 2 * atan2(sqrt(arc), sqrt(1-arc));
    _H
end;,

--//编辑一下就ok了.感觉看归档日志更好一些.重新建立后

SCOTT@book> select p2p_distance(36.12, -86.67, 33.94, -118.4) from dual;

P2P_DISTANCE(36.12,-86.67,33.94,-118.4)
---------------------------------------
                             2886.40705
--//与原来计算结果一样.