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