[20180918]檔案格式與sql_id.txt
[20180918]檔案格式與sql_id.txt
--//記錄測試中遇到的一個問題.這是我在探究SQL*Net more data from client遇到的問題.
--//就是實際oracle會把windows的指令碼檔案轉化為linux的文字格式.
1.環境:
SCOTT@test01p> @ver1
PORT_STRING VERSION BANNER CON_ID
------------------------------ -------------- -------------------------------------------------------------------------------- ----------
IBMPC/WIN_NT64-9.1.0 12.1.0.1.0 Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production 0
--//unix與dos的文字格式存在區別,就是每行的結尾windows是0x0d 0x0a.而linux是0x0a.
D:\temp\test>cat dept_dos.txt
select
*
from
dept;
D:\temp\test>cat dept_unix.txt
select
*
from
dept;
--//這樣看上去2個檔案一樣的實際上.實際上1個dos格式,1個unix格式.
D:\temp\test>ls -l dept*
-rw-rw-rw- 1 user group 24 Sep 19 22:58 dept_dos.txt
-rw-rw-rw- 1 user group 20 Sep 19 23:01 dept_unix.txt
--//unix格式的對應檔案少4個位元組.正好4行.
2.測試:
SCOTT@test01p> @ dept_dos.txt
DEPTNO DNAME LOC
---------- -------------------- -------------
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS DALLAS
SCOTT@test01p> @ dpc '' ''
PLAN_TABLE_OUTPUT
-------------------------------------
SQL_ID 3knyh7z401k69, child number 0
-------------------------------------
select * from dept
Plan hash value: 3383998547
---------------------------------------------------------------------------
| Id | Operation | Name | E-Rows |E-Bytes| Cost (%CPU)| E-Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | 3 (100)| |
| 1 | TABLE ACCESS FULL| DEPT | 4 | 80 | 3 (0)| 00:00:01 |
---------------------------------------------------------------------------
Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------
1 - SEL$1 / DEPT@SEL$1
--//sql_id=3knyh7z401k69.
SCOTT@test01p> @ dept_unix.txt
DEPTNO DNAME LOC
---------- -------------------- -------------
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS DALLAS
SCOTT@test01p> @ dpc '' ''
PLAN_TABLE_OUTPUT
-------------------------------------
SQL_ID 3knyh7z401k69, child number 0
-------------------------------------
select * from dept
Plan hash value: 3383998547
---------------------------------------------------------------------------
| Id | Operation | Name | E-Rows |E-Bytes| Cost (%CPU)| E-Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | 3 (100)| |
| 1 | TABLE ACCESS FULL| DEPT | 4 | 80 | 3 (0)| 00:00:01 |
---------------------------------------------------------------------------
Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------
1 - SEL$1 / DEPT@SEL$1
--//sql_id=3knyh7z401k69.
--//可以發現sql_id一樣的.如果你使用一些網路抓包軟體tcpdump,也可以驗證這個問題.
SCOTT@test01p> select sql_id,hash_value,sql_text,executions from v$sql where sql_id='3knyh7z401k69';
SQL_ID HASH_VALUE SQL_TEXT EXECUTIONS
------------- ---------- ------------------ ----------
3knyh7z401k69 3355494601 select * from dept 2
--//這樣執行2次.
SCOTT@test01p> select distinct name,hash_value,full_hash_value from V$DB_OBJECT_CACHE where hash_value='3355494601';
NAME HASH_VALUE FULL_HASH_VALUE
-------------------- ---------- --------------------------------
select * from dept 3355494601 de2b693a53b60a083953d03fc800c8c9
SCOTT@test01p> select dump(sql_text,16) c70 from v$sql where sql_id='3knyh7z401k69';
C70
----------------------------------------------------------------------
Typ=1 Len=18: 73,65,6c,65,63,74,20,2a,20,66,72,6f,6d,20,64,65,70,74
--//注這裡看到也是不一致的.裡面有空格.可以在toad觀察sql_fulltext.
--//建立檔案aaa.txt ,xxd檢視如下:
00000000: 7365 6c65 6374 0a2a 0a66 726f 6d0a 6465 select.*.from.de
00000010: 7074 00 pt.
--//在vim下執行:set binary,儲存檔案aaa.txt
D:\temp\test>cat aaa.txt | md5sum |sed "s/ -//" | D:\tools\Vim\vim80\xxd -r -p | od -t x4 | sed -n -e "s/^0000000 //" -e "s/ //gp"
de2b693a53b60a083953d03fc800c8c9
--//在linux下執行:
# echo -n -e 'select\n*\nfrom\ndept\0' |md5sum |sed "s/ -//" | xxd -r -p | od -t x4 | sed -n -e "s/^0000000 //" -e "s/ //gp"
de2b693a53b60a083953d03fc800c8c9
--//full_hash_value=de2b693a53b60a083953d03fc800c8c9一致.
--//再次驗證oracle把執行文字轉化為linux格式.也就是0x0d0x0a變成了0x0a.
3.上班在linux測試環境重複測試看看:
SCOTT@book> @ 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
$ unix2dos dept_dos.txt
unix2dos: converting file dept_dos.txt to DOS format ...
$ xxd -c 16 dept_dos.txt
0000000: 7365 6c65 6374 0d0a 2a0d 0a66 726f 6d0d select..*..from.
0000010: 0a64 6570 743b 0d0a .dept;..
--//注意看現在是dos格式.
SCOTT@book> @ dept_dos.txt
DEPTNO DNAME LOC
---------- -------------- -------------
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS BOSTON
SCOTT@book> @ &r/dpc '' ''
PLAN_TABLE_OUTPUT
-------------------------------------
SQL_ID 3knyh7z401k69, child number 0
-------------------------------------
select * from dept
Plan hash value: 3383998547
---------------------------------------------------------------------------
| Id | Operation | Name | E-Rows |E-Bytes| Cost (%CPU)| E-Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | 3 (100)| |
| 1 | TABLE ACCESS FULL| DEPT | 4 | 80 | 3 (0)| 00:00:01 |
---------------------------------------------------------------------------
Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------
1 - SEL$1 / DEPT@SEL$1
--//sql_id=3knyh7z401k69,與前面一樣.
--//透過tcpdump抓包看看.
# tcpdump -l -i eth0 -s 0 -A port 1521 and host 192.168.98.6 -nn -w t.txt
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
^C5 packets captured
6 packets received by filter
0 packets dropped by kernel
# xxd -c 16 t.txt
0000000: d4c3 b2a1 0200 0400 0000 0000 0000 0000 悅..............
0000010: ffff 0000 0100 0000 34f7 a25b 63d9 0600 ......4..[c?.
0000020: 4901 0000 4901 0000 a0d3 c1f4 713c 0cda I...I....恿魆<.?
0000030: 41b6 4e07 0800 4500 013b 2aa2 4000 7f06 A.N...E..;*.@...
0000040: 8875 c0a8 6206 c0a8 644e c9b9 05f1 87fc .u?b.?dN?.??
0000050: 15d1 73b5 7d4c 5018 3f02 0666 0000 0113 .裺祡LP.?..f....
0000060: 0000 0600 0000 0000 1169 20fe ffff ffff .........i ?
0000070: ffff ff01 0000 0002 0000 0003 5e21 6180 .........^!a.
0000080: 0000 0000 0000 feff ffff ffff ffff 1200 ......?..
0000090: 0000 feff ffff ffff ffff 0d00 0000 feff ..?....?
00000a0: ffff ffff ffff feff ffff ffff ffff 0000 ?..
00000b0: 0000 0100 0000 0000 0000 0000 0000 0000 ................
00000c0: 0000 0000 0000 0000 0000 0000 0000 feff ..............?
00000d0: ffff ffff ffff 0000 0000 0000 0000 feff ........?
00000e0: ffff ffff ffff feff ffff ffff ffff feff ??
00000f0: ffff ffff ffff 0000 0000 0000 0000 feff ........?
0000100: ffff ffff ffff feff ffff ffff ffff 0000 ?..
0000110: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0000120: 0000 0000 0000 0000 0000 1273 656c 6563 ...........selec
~~~~~~~~~~~~~~
0000130: 740a 2a0a 6672 6f6d 0a64 6570 7401 0000 t.*.from.dept...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0000140: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0000150: 0000 0000 0000 0000 0001 0000 0000 0000 ................
0000160: 0000 8000 0000 0000 0000 0000 0000 0000 ................
--//注意前面的0x12=18表示sql語句長度.
$ xxd -c 32 dept_dos.txt
0000000: 7365 6c65 6374 0d0a 2a0d 0a66 726f 6d0d 0a64 6570 743b 0d0a select..*..from..dept;..
--//上下對比就明白在傳輸到服務端時已經丟棄了0x0d字元.
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/267265/viewspace-2214629/，如需轉載，請註明出處，否則將追究法律責任。
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