Oracle 验证IOT表数据存储在主键里

iot表测试:

 
在create table语句后面使用organization index，就指定数据表创建结构是IOT。但是在不指定主键Primary Key的情况下，是不允许建表的。
 create table t2 (id int primary key,a1 char(10),a2 char(10),a3 char(10))organization index; 


SQL> select object_name,object_type from user_objects;

OBJECT_NAME															 OBJECT_TYPE
-------------------------------------------------------------------------------------------------------------------------------- -------------------
T1																 TABLE
SYS_C0021515	



SQL> select object_name,object_type from user_objects;

OBJECT_NAME															 OBJECT_TYPE
-------------------------------------------------------------------------------------------------------------------------------- -------------------
SYS_IOT_TOP_101447														 INDEX
T2																 TABLE
SYS_C0021515															 INDEX
T1	


SQL> select segment_name,SEGMENT_TYPE,TABLESPACE_NAME,bytes,blocks,extents from user_segments;

SEGMENT_NAME		       SEGMENT_TYPE	  TABLESPACE_NAME		      BYTES	BLOCKS	  EXTENTS
------------------------------ ------------------ ------------------------------ ---------- ---------- ----------
SYS_C0021515		       INDEX		  USERS 			     131072	    16		2
SYS_IOT_TOP_101447	       INDEX		  USERS 			     196608	    24		3
T1			       TABLE		  USERS 			     196608	    24		3

可以IOT表数据都存放在索引里

SQL> select table_name,TABLESPACE_NAME,CLUSTER_NAME,IOT_NAME from user_tables;

TABLE_NAME	TABLESPACE_NAME 	       CLUSTER_NAME		      IOT_NAME
--------------- ------------------------------ ------------------------------ ------------------------------
T2
T1		USERS

SQL> select segment_name,SEGMENT_TYPE, TABLESPACE_NAME,EXTENT_ID,bytes,blocks from user_extents;

SEGMENT_NAME	     SEGMENT_TYPE	TABLESPACE_NAME 		EXTENT_ID      BYTES	 BLOCKS
-------------------- ------------------ ------------------------------ ---------- ---------- ----------
T1		     TABLE		USERS					0      65536	      8
T1		     TABLE		USERS					1      65536	      8
T1		     TABLE		USERS					2      65536	      8
SYS_C0021515	     INDEX		USERS					0      65536	      8
SYS_C0021515	     INDEX		USERS					1      65536	      8
SYS_IOT_TOP_101447   INDEX		USERS					0      65536	      8
SYS_IOT_TOP_101447   INDEX		USERS					1      65536	      8
SYS_IOT_TOP_101447   INDEX		USERS					2      65536	      8

已选择8行。


可以看到根本没有给t2(iot)表分配空间

SQL> set linesize 200
SQL> select object_name,object_id from user_objects;

OBJECT_NAME															  OBJECT_ID
-------------------------------------------------------------------------------------------------------------------------------- ----------
SYS_IOT_TOP_101449														     101450
T2																     101449


begin 
for i in 1 .. 2000 
loop 
insert into t2 values(i,i,i,'a'||i); 
end loop 
; 
commit; 
end;

将索引dump到trace文件中
SQL>  select value from v$diag_info where name='Default Trace File';

VALUE
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
/u01/app/oracle/diag/rdbms/oadb/oadb/trace/oadb_ora_29729.trc

SQL> alter session set events 'immediate trace name treedump level 101450';

会话已更改。

----- begin tree dump
branch: 0x10000ab 16777387 (0: nrow: 12, level: 1)
   leaf: 0x10000ac 16777388 (-1: nrow: 184 rrow: 184)
   leaf: 0x10000ad 16777389 (0: nrow: 181 rrow: 181)
   leaf: 0x10000ae 16777390 (1: nrow: 181 rrow: 181)
   leaf: 0x10000af 16777391 (2: nrow: 181 rrow: 181)
   leaf: 0x10000b4 16777396 (3: nrow: 181 rrow: 181)
   leaf: 0x10000b5 16777397 (4: nrow: 181 rrow: 181)
   leaf: 0x10000b6 16777398 (5: nrow: 181 rrow: 181)
   leaf: 0x10000b7 16777399 (6: nrow: 181 rrow: 181)
   leaf: 0x10000b0 16777392 (7: nrow: 181 rrow: 181)
   leaf: 0x10000b1 16777393 (8: nrow: 181 rrow: 181)
   leaf: 0x10000b2 16777394 (9: nrow: 181 rrow: 181)
   leaf: 0x10000b3 16777395 (10: nrow: 6 rrow: 6)
----- end tree dump
~                          

SQL> select dbms_utility.data_block_address_file(16777388)fno,
dbms_utility.data_block_address_block(16777388) bkno from dual  2  ;

       FNO	 BKNO
---------- ----------
	 4	  172


alter system dump datafile 4 block 172;


dump 信息如下；

tab 0, row 0, @0x1f69
tl: 47 fb: --H-FL-- lb: 0x0  cc: 4
col  0: [10]  36 31 20 20 20 20 20 20 20 20
col  1: [10]  36 31 20 20 20 20 20 20 20 20
col  2: [10]  36 31 20 20 20 20 20 20 20 20
col  3: [10]  61 36 31 20 20 20 20 20 20 20
tab 0, row 1, @0x1f3a
tl: 47 fb: --H-FL-- lb: 0x2  cc: 4
col  0: [10]  31 30 30 20 20 20 20 20 20 20
col  1: [10]  31 30 30 20 20 20 20 20 20 20
col  2: [10]  31 30 30 20 20 20 20 20 20 20
col  3: [10]  61 31 30 30 20 20 20 20 20 20
tab 0, row 2, @0x1f0b
tl: 47 fb: --H-FL-- lb: 0x2  cc: 4
col  0: [10]  31 30 31 20 20 20 20 20 20 20
col  1: [10]  31 30 31 20 20 20 20 20 20 20
col  2: [10]  31 30 31 20 20 20 20 20 20 20
col  3: [10]  61 31 30 31 20 20 20 20 20 20
tab 0, row 3, @0x1edc
tl: 47 fb: --H-FL-- lb: 0x2  cc: 4
col  0: [10]  31 30 32 20 20 20 20 20 20 20
col  1: [10]  31 30 32 20 20 20 20 20 20 20
col  2: [10]  31 30 32 20 20 20 20 20 20 20
col  3: [10]  61 31 30 32 20 20 20 20 20 20
tab 0, row 4, @0x1ead
tl: 47 fb: --H-FL-- lb: 0x2  cc: 4
col  0: [10]  31 30 33 20 20 20 20 20 20 20
col  1: [10]  31 30 33 20 20 20 20 20 20 20
col  2: [10]  31 30 33 20 20 20 20 20 20 20
col  3: [10]  61 31 30 33 20 20 20 20 20 20
tab 0, row 5, @0x1e7e
tl: 47 fb: --H-FL-- lb: 0x2  cc: 4
col  0: [10]  31 30 34 20 20 20 20 20 20 20
col  1: [10]  31 30 34 20 20 20 20 20 20 20
col  2: [10]  31 30 34 20 20 20 20 20 20 20
col  3: [10]  61 31 30 34 20 20 20 20 20 20


DECLARE
   n   VARCHAR2 (2000);
BEGIN
   DBMS_STATS.convert_raw_value ('36', n);
   DBMS_OUTPUT.put_line (n);
   DBMS_STATS.convert_raw_value ('31', n);
   DBMS_OUTPUT.put_line (n);
   DBMS_STATS.convert_raw_value ('20', n);
   DBMS_OUTPUT.put_line (n);
   DBMS_STATS.convert_raw_value ('20', n);
   DBMS_OUTPUT.put_line (n);
   DBMS_STATS.convert_raw_value ('20', n);
   DBMS_OUTPUT.put_line (n);
   DBMS_STATS.convert_raw_value ('20', n);
   DBMS_OUTPUT.put_line (n);
   DBMS_STATS.convert_raw_value ('20', n);
   DBMS_OUTPUT.put_line (n);
   DBMS_STATS.convert_raw_value ('20', n);
   DBMS_OUTPUT.put_line (n);
   DBMS_STATS.convert_raw_value ('20', n);
   DBMS_OUTPUT.put_line (n);
   DBMS_STATS.convert_raw_value ('20', n);
   DBMS_OUTPUT.put_line (n);
END;

tab 0, row 0, @0x1f69
tl: 47 fb: --H-FL-- lb: 0x0  cc: 4
col  0: [10]  36 31 20 20 20 20 20 20 20 20  表示61
col  1: [10]  36 31 20 20 20 20 20 20 20 20  表示61
col  2: [10]  36 31 20 20 20 20 20 20 20 20   表示61
col  3: [10]  61 36 31 20 20 20 20 20 20 20   表示a61



tab 0, row 1, @0x1f3a
tl: 47 fb: --H-FL-- lb: 0x2  cc: 4
col  0: [10]  31 30 30 20 20 20 20 20 20 20    表示100
col  1: [10]  31 30 30 20 20 20 20 20 20 20    表示100
col  2: [10]  31 30 30 20 20 20 20 20 20 20    表示100
col  3: [10]  61 31 30 30 20 20 20 20 20 20    表示a100


tab 0, row 2, @0x1f0b
tl: 47 fb: --H-FL-- lb: 0x2  cc: 4
col  0: [10]  31 30 31 20 20 20 20 20 20 20   表示101
col  1: [10]  31 30 31 20 20 20 20 20 20 20   表示101
col  2: [10]  31 30 31 20 20 20 20 20 20 20   表示101
col  3: [10]  61 31 30 31 20 20 20 20 20 20   表示a101

tab 0, row 3, @0x1edc
tl: 47 fb: --H-FL-- lb: 0x2  cc: 4
col  0: [10]  31 30 32 20 20 20 20 20 20 20  表示102
col  1: [10]  31 30 32 20 20 20 20 20 20 20  表示102
col  2: [10]  31 30 32 20 20 20 20 20 20 20  表示102
col  3: [10]  61 31 30 32 20 20 20 20 20 20  表示a102


tab 0, row 4, @0x1ead
tl: 47 fb: --H-FL-- lb: 0x2  cc: 4
col  0: [10]  31 30 33 20 20 20 20 20 20 20  表示103
col  1: [10]  31 30 33 20 20 20 20 20 20 20  表示103
col  2: [10]  31 30 33 20 20 20 20 20 20 20  表示103
col  3: [10]  61 31 30 33 20 20 20 20 20 20  表示a103

tab 0, row 5, @0x1e7e
tl: 47 fb: --H-FL-- lb: 0x2  cc: 4
col  0: [10]  31 30 34 20 20 20 20 20 20 20  表示104
col  1: [10]  31 30 34 20 20 20 20 20 20 20  表示104
col  2: [10]  31 30 34 20 20 20 20 20 20 20  表示104
col  3: [10]  61 31 30 34 20 20 20 20 20 20  表示a104