关于HWM的一些测试
2012-05-08 17:02
176 查看
#############################################创建测试表空间和用户###################################
create tablespace hwm
datafile '/db/oracle/oradata/orcl/hwm.dbf'
size 10M;
create user hwm identified by hwm default tablespace hwm temporary tablespace temp;
grant connect,resource,dba to hwm;
conn hwm/hwm;
#############################################创建测试表#############################################
SQL> CREATE TABLE TEST_HWM(
2 C1 NUMBER(10),
3 C2 VARCHAR(100)
4 );
Table created.
###########################################未插入数据前DUMP#########################################
SQL> COLUMN OBJECT_NAME FORMAT A20
SQL>
SQL> SELECT OBJECT_ID,OBJECT_NAME FROM DBA_OBJECTS WHERE OBJECT_NAME='TEST_HWM';
OBJECT_ID OBJECT_NAME
---------- --------------------
52513 TEST_HWM
SQL> SELECT EXTENT_ID,FILE_ID,RELATIVE_FNO,BLOCK_ID,BLOCKS FROM DBA_EXTENTS WHERE SEGMENT_NAME='TEST_HWM';
EXTENT_ID FILE_ID RELATIVE_FNO BLOCK_ID BLOCKS
---------- ---------- ------------ ---------- ----------
0 6 6 265 8
SQL> ALTER SYSTEM DUMP DATAFILE 6 BLOCK 265;
###########################################DUMP 结果########################################################
[oracle@ccitca udump]$ cat orcl_ora_3546.trc
/db/oracle/admin/orcl/udump/orcl_ora_3546.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
ORACLE_HOME = /db/oracle/product/10.2.0/db_1
System name: Linux
Node name: ccitca
Release: 2.6.18-164.el5
Version: #1 SMP Tue Aug 18 15:51:54 EDT 2009
Machine: i686
Instance name: orcl
Redo thread mounted by this instance: 1
Oracle process number: 15
Unix process pid: 3546, image: oracle@ccitca (TNS V1-V3)
*** 2012-05-09 15:25:57.526
*** ACTION NAME:() 2012-05-09 15:25:57.526
*** MODULE NAME:(SQL*Plus) 2012-05-09 15:25:57.526
*** SERVICE NAME:(SYS$USERS) 2012-05-09 15:25:57.526
*** SESSION ID:(159.5) 2012-05-09 15:25:57.526
Start dump data blocks tsn: 7 file#: 6 minblk 265 maxblk 265
buffer tsn: 7 rdba: 0x01800109 (6/265)
scn: 0x0000.00092080 seq: 0x01 flg: 0x00 tail: 0x20802001
frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK
Hex dump of block: st=0, typ_found=1
Dump of memory from 0x0DCCA400 to 0x0DCCC400
DCCA400 0000A220 01800109 00092080 00010000 [ ........ ......]
DCCA410 00000000 00000000 00000000 00000000 [................]
Repeat 2 times
DCCA440 00000000 00000000 00000000 00000004 [................]
DCCA450 FFFFFFFF 00000005 00000003 00000008 [................]
DCCA460 00010001 00000000 00000000 00000000 [................]
DCCA470 00000000 00000003 00000000 00000000 [................]
DCCA480 00000000 00000000 00000000 00000000 [................]
DCCA490 0180010A 00000000 00000000 00000003 [................]
DCCA4A0 00000008 0180010C 00000000 00000000 [................]
DCCA4B0 00000000 00000000 00000000 00000001 [................]
DCCA4C0 0000CD21 00000000 00000000 01800109 [!...............]
DCCA4D0 00000008 00000000 00000000 00000000 [................]
DCCA4E0 00000000 00000000 00000000 00000000 [................]
Repeat 9 times
DCCA580 00000000 00000000 00000000 00001011 [................]
DCCA590 00000000 00000000 00000000 00000000 [................]
Repeat 485 times
DCCC3F0 00000000 00000000 00000000 20802001 [............. . ]
Dump of First Level Bitmap Block
--------------------------------
nbits : 4 nranges: 1 parent dba: 0x0180010a poffset: 0
unformatted: 5 total: 8 first useful block: 3
owning instance : 1
instance ownership changed at
Last successful Search
Freeness Status: nf1 0 nf2 0 nf3 0 nf4 0
Extent Map Block Offset: 4294967295
First free datablock : 3
Bitmap block lock opcode 0
Locker xid: : 0x0000.000.00000000
Inc #: 0 Objd: 52513
HWM Flag: HWM Set
Highwater:: 0x0180010c ext#: 0 blk#: 3 ext size: 8
#blocks in seg. hdr's freelists: 0
#blocks below: 0
mapblk 0x00000000 offset: 0
--------------------------------------------------------
DBA Ranges :
--------------------------------------------------------
0x01800109 Length: 8 Offset: 0
0:Metadata 1:Metadata 2:Metadata 3:unformatted
4:unformatted 5:unformatted 6:unformatted 7:unformatted
--------------------------------------------------------
End dump data blocks tsn: 7 file#: 6 minblk 265 maxblk 265
[oracle@ccitca udump]$
########################################插入1000条数据再DUMP#####################################
SQL> DECLARE
2 I NUMBER(10);
3 BEGIN
4 FOR I IN 1..1000 LOOP
5 INSERT INTO TEST_HWM VALUES(I,'TEST_HWM');
6 END LOOP;
7 COMMIT;
8 END;
9 /
PL/SQL procedure successfully completed.
SQL> ALTER SYSTEM DUMP DATAFILE 6 BLOCK 265;
[oracle@ccitca udump]$ cat orcl_ora_3747.trc
/db/oracle/admin/orcl/udump/orcl_ora_3747.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
ORACLE_HOME = /db/oracle/product/10.2.0/db_1
System name: Linux
Node name: ccitca
Release: 2.6.18-164.el5
Version: #1 SMP Tue Aug 18 15:51:54 EDT 2009
Machine: i686
Instance name: orcl
Redo thread mounted by this instance: 1
Oracle process number: 15
Unix process pid: 3747, image: oracle@ccitca (TNS V1-V3)
*** 2012-05-09 15:54:32.959
*** ACTION NAME:() 2012-05-09 15:54:32.958
*** MODULE NAME:(SQL*Plus) 2012-05-09 15:54:32.958
*** SERVICE NAME:(SYS$USERS) 2012-05-09 15:54:32.958
*** SESSION ID:(159.7) 2012-05-09 15:54:32.958
Start dump data blocks tsn: 7 file#: 6 minblk 265 maxblk 265
buffer tsn: 7 rdba: 0x01800109 (6/265)
scn: 0x0000.000924b3 seq: 0x01 flg: 0x00 tail: 0x24b32001
frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK
Hex dump of block: st=0, typ_found=1
Dump of memory from 0x0D946600 to 0x0D948600
D946600 0000A220 01800109 000924B3 00010000 [ ........$......]
D946610 00000000 00000000 00000000 00000000 [................]
Repeat 2 times
D946640 00000000 00000000 00000000 00000004 [................]
D946650 FFFFFFFF 00000000 00000003 00000008 [................]
D946660 00010001 00000000 00000000 00000001 [................]
D946670 00000002 00000004 4FAA224A 4FAA224A [........J".OJ".O]
D946680 00000000 00000000 00000000 00000000 [................]
D946690 0180010A 00000000 00000000 00000008 [................]
D9466A0 00000008 01800111 00000000 00000000 [................]
D9466B0 00000000 00000005 00000000 00000001 [................]
D9466C0 0000CD21 00000000 00000000 01800109 [!...............]
D9466D0 00000008 00000000 00000000 00000000 [................]
D9466E0 00000000 00000000 00000000 00000000 [................]
Repeat 9 times
D946780 00000000 00000000 00000000 51451111 [..............EQ]
D946790 00000000 00000000 00000000 00000000 [................]
Repeat 485 times
D9485F0 00000000 00000000 00000000 24B32001 [............. .$]
Dump of First Level Bitmap Block
--------------------------------
nbits : 4 nranges: 1 parent dba: 0x0180010a poffset: 0
unformatted: 0 total: 8 first useful block: 3
owning instance : 1
instance ownership changed at 05/09/2012 15:52:42
Last successful Search 05/09/2012 15:52:42
Freeness Status: nf1 0 nf2 0 nf3 1 nf4 2
Extent Map Block Offset: 4294967295
First free datablock : 4
Bitmap block lock opcode 0
Locker xid: : 0x0000.000.00000000
Inc #: 0 Objd: 52513
HWM Flag: HWM Set
Highwater:: 0x01800111 ext#: 0 blk#: 8 ext size: 8
#blocks in seg. hdr's freelists: 0
#blocks below: 5
mapblk 0x00000000 offset: 0
--------------------------------------------------------
DBA Ranges :
--------------------------------------------------------
0x01800109 Length: 8 Offset: 0
0:Metadata 1:Metadata 2:Metadata 3:FULL
4:50-75% free 5:75-100% free 6:75-100% free 7:FULL
--------------------------------------------------------
End dump data blocks tsn: 7 file#: 6 minblk 265 maxblk 265
################################插入2000条数据再DUMP##################################
SQL> DECLARE
2 I NUMBER(10);
3 BEGIN
4 FOR I IN 1001..2000 LOOP
5 INSERT INTO TEST_HWM VALUES(I,'TEST_HWM_2000');
6 END LOOP;
7 COMMIT;
8 END;
9 /
PL/SQL procedure successfully completed.
SQL> ALTER SYSTEM DUMP DATAFILE 6 BLOCK 265;
[oracle@ccitca udump]$ cat orcl_ora_3747.trc
/db/oracle/admin/orcl/udump/orcl_ora_3747.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
ORACLE_HOME = /db/oracle/product/10.2.0/db_1
System name: Linux
Node name: ccitca
Release: 2.6.18-164.el5
Version: #1 SMP Tue Aug 18 15:51:54 EDT 2009
Machine: i686
Instance name: orcl
Redo thread mounted by this instance: 1
Oracle process number: 15
Unix process pid: 3747, image: oracle@ccitca (TNS V1-V3)
*** 2012-05-09 15:54:32.959
*** ACTION NAME:() 2012-05-09 15:54:32.958
*** MODULE NAME:(SQL*Plus) 2012-05-09 15:54:32.958
*** SERVICE NAME:(SYS$USERS) 2012-05-09 15:54:32.958
*** SESSION ID:(159.7) 2012-05-09 15:54:32.958
Start dump data blocks tsn: 7 file#: 6 minblk 265 maxblk 265
buffer tsn: 7 rdba: 0x01800109 (6/265)
scn: 0x0000.000924b3 seq: 0x01 flg: 0x00 tail: 0x24b32001
frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK
Hex dump of block: st=0, typ_found=1
Dump of memory from 0x0D946600 to 0x0D948600
D946600 0000A220 01800109 000924B3 00010000 [ ........$......]
D946610 00000000 00000000 00000000 00000000 [................]
Repeat 2 times
D946640 00000000 00000000 00000000 00000004 [................]
D946650 FFFFFFFF 00000000 00000003 00000008 [................]
D946660 00010001 00000000 00000000 00000001 [................]
D946670 00000002 00000004 4FAA224A 4FAA224A [........J".OJ".O]
D946680 00000000 00000000 00000000 00000000 [................]
D946690 0180010A 00000000 00000000 00000008 [................]
D9466A0 00000008 01800111 00000000 00000000 [................]
D9466B0 00000000 00000005 00000000 00000001 [................]
D9466C0 0000CD21 00000000 00000000 01800109 [!...............]
D9466D0 00000008 00000000 00000000 00000000 [................]
D9466E0 00000000 00000000 00000000 00000000 [................]
Repeat 9 times
D946780 00000000 00000000 00000000 51451111 [..............EQ]
D946790 00000000 00000000 00000000 00000000 [................]
Repeat 485 times
D9485F0 00000000 00000000 00000000 24B32001 [............. .$]
Dump of First Level Bitmap Block
--------------------------------
nbits : 4 nranges: 1 parent dba: 0x0180010a poffset: 0
unformatted: 0 total: 8 first useful block: 3
owning instance : 1
instance ownership changed at 05/09/2012 15:52:42
Last successful Search 05/09/2012 15:52:42
Freeness Status: nf1 0 nf2 0 nf3 1 nf4 2
Extent Map Block Offset: 4294967295
First free datablock : 4
Bitmap block lock opcode 0
Locker xid: : 0x0000.000.00000000
Inc #: 0 Objd: 52513
HWM Flag: HWM Set
Highwater:: 0x01800111 ext#: 0 blk#: 8 ext size: 8
#blocks in seg. hdr's freelists: 0
#blocks below: 5
mapblk 0x00000000 offset: 0
--------------------------------------------------------
DBA Ranges :
--------------------------------------------------------
0x01800109 Length: 8 Offset: 0
0:Metadata 1:Metadata 2:Metadata 3:FULL
4:50-75% free 5:75-100% free 6:75-100% free 7:FULL
--------------------------------------------------------
End dump data blocks tsn: 7 file#: 6 minblk 265 maxblk 265
*** 2012-05-09 15:59:51.677
Start dump data blocks tsn: 7 file#: 6 minblk 265 maxblk 265
buffer tsn: 7 rdba: 0x01800109 (6/265)
scn: 0x0000.00092566 seq: 0x02 flg: 0x00 tail: 0x25662002
frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK
Hex dump of block: st=0, typ_found=1
Dump of memory from 0x0D946600 to 0x0D948600
D946600 0000A220 01800109 00092566 00020000 [ .......f%......]
D946610 00000000 00000000 00000000 00000000 [................]
Repeat 2 times
D946640 00000000 00000000 00000000 00000004 [................]
D946650 FFFFFFFF 00000000 00000003 00000010 [................]
D946660 00010002 00000000 00000001 00000000 [................]
D946670 00000007 00000008 4FAA23AC 4FAA23AC [.........#.O.#.O]
D946680 00000000 00000000 00000000 00000000 [................]
D946690 0180010A 00000000 00000001 00000008 [................]
D9466A0 00000008 01800119 00000000 00000001 [................]
D9466B0 00000000 0000000D 00000000 00000001 [................]
D9466C0 0000CD21 00000000 00000000 01800109 [!...............]
D9466D0 00000008 00000000 01800111 00000008 [................]
D9466E0 00000008 00000000 00000000 00000000 [................]
D9466F0 00000000 00000000 00000000 00000000 [................]
Repeat 8 times
D946780 00000000 00000000 00000000 11111111 [................]
D946790 53555555 00000000 00000000 00000000 [UUUS............]
D9467A0 00000000 00000000 00000000 00000000 [................]
Repeat 484 times
D9485F0 00000000 00000000 00000000 25662002 [............. f%]
Dump of First Level Bitmap Block
--------------------------------
nbits : 4 nranges: 2 parent dba: 0x0180010a poffset: 0
unformatted: 0 total: 16 first useful block: 3
owning instance : 1
instance ownership changed at 05/09/2012 15:58:36
Last successful Search 05/09/2012 15:58:36
Freeness Status: nf1 0 nf2 1 nf3 0 nf4 7
Extent Map Block Offset: 4294967295
First free datablock : 8
Bitmap block lock opcode 0
Locker xid: : 0x0000.000.00000000
Inc #: 0 Objd: 52513
HWM Flag: HWM Set
Highwater:: 0x01800119 ext#: 1 blk#: 8 ext size: 8
#blocks in seg. hdr's freelists: 0
#blocks below: 13
mapblk 0x00000000 offset: 1
--------------------------------------------------------
DBA Ranges :
--------------------------------------------------------
0x01800109 Length: 8 Offset: 0
0x01800111 Length: 8 Offset: 8
0:Metadata 1:Metadata 2:Metadata 3:FULL
4:FULL 5:FULL 6:FULL 7:FULL
8:75-100% free 9:75-100% free 10:75-100% free 11:75-100% free
12:75-100% free 13:75-100% free 14:75-100% free 15:25-50% free
--------------------------------------------------------
End dump data blocks tsn: 7 file#: 6 minblk 265 maxblk 265
[oracle@ccitca udump]$
#####################################查看执行计划###################################
SQL> SET AUTOTRACE TRACEONLY
SQL> SET TIMING ON
SQL> SELECT COUNT(*) FROM TEST_HWM;
Elapsed: 00:00:00.05
Execution Plan
----------------------------------------------------------
Plan hash value: 2326001506
-----------------------------------------------------------------------
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
-----------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 5 (0)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | | |
| 2 | TABLE ACCESS FULL| TEST_HWM | 2000 | 5 (0)| 00:00:01 |
-----------------------------------------------------------------------
Note
-----
- dynamic sampling used for this statement
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
16 consistent gets
0 physical reads
0 redo size
411 bytes sent via SQL*Net to client
385 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
########################################分析表####################################################
SQL>
SQL> BEGIN
2 DBMS_STATS.GATHER_TABLE_STATS(OWNNAME=>'HWM',
3 TABNAME=>'TEST_HWM',
4 PARTNAME=>NULL);
5 END;
6 /
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.73
SQL> SET LINE 140
SQL> SELECT NUM_ROWS,BLOCKS,EMPTY_BLOCKS FROM DBA_TABLES WHERE TABLE_NAME='TEST_HWM';
Elapsed: 00:00:00.02
Execution Plan
----------------------------------------------------------
Plan hash value: 3561033063
-------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 2 | 324 | 28 (4)| 00:00:01 |
|* 1 | HASH JOIN | | 2 | 324 | 28 (4)| 00:00:01 |
| 2 | MERGE JOIN CARTESIAN | | 2 | 298 | 27 (0)| 00:00:01 |
| 3 | NESTED LOOPS OUTER | | 2 | 188 | 27 (0)| 00:00:01 |
| 4 | NESTED LOOPS OUTER | | 2 | 182 | 25 (0)| 00:00:01 |
| 5 | NESTED LOOPS OUTER | | 2 | 168 | 23 (0)| 00:00:01 |
| 6 | NESTED LOOPS OUTER | | 2 | 160 | 23 (0)| 00:00:01 |
| 7 | NESTED LOOPS | | 2 | 138 | 21 (0)| 00:00:01 |
| 8 | NESTED LOOPS | | 2 | 132 | 19 (0)| 00:00:01 |
| 9 | NESTED LOOPS | | 2 | 62 | 18 (0)| 00:00:01 |
|* 10 | TABLE ACCESS BY INDEX ROWID| OBJ$ | 2 | 56 | 16 (0)| 00:00:01 |
|* 11 | INDEX SKIP SCAN | I_OBJ2 | 2 | | 15 (0)| 00:00:01 |
| 12 | TABLE ACCESS CLUSTER | USER$ | 1 | 3 | 1 (0)| 00:00:01 |
|* 13 | INDEX UNIQUE SCAN | I_USER# | 1 | | 0 (0)| 00:00:01 |
|* 14 | TABLE ACCESS CLUSTER | TAB$ | 1 | 35 | 1 (0)| 00:00:01 |
|* 15 | INDEX UNIQUE SCAN | I_OBJ# | 1 | | 0 (0)| 00:00:01 |
| 16 | TABLE ACCESS CLUSTER | TS$ | 1 | 3 | 1 (0)| 00:00:01 |
|* 17 | INDEX UNIQUE SCAN | I_TS# | 1 | | 0 (0)| 00:00:01 |
| 18 | TABLE ACCESS CLUSTER | SEG$ | 1 | 11 | 1 (0)| 00:00:01 |
|* 19 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 1 | | 0 (0)| 00:00:01 |
|* 20 | INDEX UNIQUE SCAN | I_OBJ1 | 1 | 4 | 0 (0)| 00:00:01 |
| 21 | TABLE ACCESS BY INDEX ROWID | OBJ$ | 1 | 7 | 1 (0)| 00:00:01 |
|* 22 | INDEX UNIQUE SCAN | I_OBJ1 | 1 | | 0 (0)| 00:00:01 |
| 23 | TABLE ACCESS CLUSTER | USER$ | 1 | 3 | 1 (0)| 00:00:01 |
|* 24 | INDEX UNIQUE SCAN | I_USER# | 1 | | 0 (0)| 00:00:01 |
| 25 | BUFFER SORT | | 1 | 55 | 26 (0)| 00:00:01 |
|* 26 | FIXED TABLE FULL | X$KSPPI | 1 | 55 | 0 (0)| 00:00:01 |
| 27 | FIXED TABLE FULL | X$KSPPCV | 100 | 1300 | 0 (0)| 00:00:01 |
-------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - access("KSPPI"."INDX"="KSPPCV"."INDX")
10 - filter(BITAND("O"."FLAGS",128)=0)
11 - access("O"."NAME"='TEST_HWM')
filter("O"."NAME"='TEST_HWM')
13 - access("O"."OWNER#"="U"."USER#")
14 - filter(BITAND("T"."PROPERTY",1)=0)
15 - access("O"."OBJ#"="T"."OBJ#")
17 - access("T"."TS#"="TS"."TS#")
19 - access("T"."TS#"="S"."TS#"(+) AND "T"."FILE#"="S"."FILE#"(+) AND
"T"."BLOCK#"="S"."BLOCK#"(+))
20 - access("T"."BOBJ#"="CO"."OBJ#"(+))
22 - access("T"."DATAOBJ#"="CX"."OBJ#"(+))
24 - access("CX"."OWNER#"="CU"."USER#"(+))
26 - filter("KSPPI"."KSPPINM"='_dml_monitoring_enabled')
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
45 consistent gets
0 physical reads
0 redo size
534 bytes sent via SQL*Net to client
385 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
1 sorts (memory)
0 sorts (disk)
1 rows processed
SQL>
SQL> SELECT NUM_ROWS,BLOCKS,EMPTY_BLOCKS FROM DBA_TABLES WHERE TABLE_NAME='TEST_HWM';
NUM_ROWS BLOCKS EMPTY_BLOCKS
---------- ---------- ------------
2000 13 0
##########################################删除数据###########################################
SQL> DELETE FROM TEST_HWM;
2000 rows deleted.
SQL> COMMIT;
Commit complete.
SQL> SELECT NUM_ROWS,BLOCKS,EMPTY_BLOCKS FROM DBA_TABLES WHERE TABLE_NAME='TEST_HWM';
NUM_ROWS BLOCKS EMPTY_BLOCKS
---------- ---------- ------------
2000 13 0
SQL> SELECT COUNT(*) FROM TEST_HWM;
Elapsed: 00:00:00.01
Execution Plan
----------------------------------------------------------
Plan hash value: 2326001506
-----------------------------------------------------------------------
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
-----------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 5 (0)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | | |
| 2 | TABLE ACCESS FULL| TEST_HWM | 2000 | 5 (0)| 00:00:01 |
-----------------------------------------------------------------------
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
16 consistent gets
0 physical reads
0 redo size
410 bytes sent via SQL*Net to client
385 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
############################# 删除数据库后查看表空间段使用情况##################################################
VAR TOTAL_BLOCKS NUMBER
VAR TOTAL_BYTES NUMBER
VAR UNUSED_BLOCKS NUMBER
VAR UNUSED_BYTES NUMBER
VAR LAST_USED_EXTENT_FILE_ID NUMBER
VAR LAST_USED_EXTENT_BLOCK_ID NUMBER
VAR LAST_USED_BLOCK NUMBER
EXEC DBMS_SPACE.UNUSED_SPACE
('HWM','TEST_HWM','TABLE',:TOTAL_BLOCKS,:TOTAL_BYTES,:UNUSED_BLOCKS,:UNUSED_BYTES,:LAST_USED_EXTENT_FILE_ID,:LAST_USED_EXTENT_BLOCK_ID,:LAST_USED_BLOCK);
PRINT TOTAL_BLOCKS
PRINT TOTAL_BYTES
PRINT UNUSED_BLOCKS
PRINT UNUSED_BYTES
PRINT LAST_USED_EXTENT_FILE_ID
PRINT LAST_USED_EXTENT_BLOCK_ID
PRINT LAST_USED_BLOCK
SQL>
TOTAL_BLOCKS
------------
16
SQL>
TOTAL_BYTES
-----------
131072
SQL>
UNUSED_BLOCKS
-------------
0
SQL>
UNUSED_BYTES
------------
0
SQL>
LAST_USED_EXTENT_FILE_ID
------------------------
6
SQL>
LAST_USED_EXTENT_BLOCK_ID
-------------------------
273
create tablespace hwm
datafile '/db/oracle/oradata/orcl/hwm.dbf'
size 10M;
create user hwm identified by hwm default tablespace hwm temporary tablespace temp;
grant connect,resource,dba to hwm;
conn hwm/hwm;
#############################################创建测试表#############################################
SQL> CREATE TABLE TEST_HWM(
2 C1 NUMBER(10),
3 C2 VARCHAR(100)
4 );
Table created.
###########################################未插入数据前DUMP#########################################
SQL> COLUMN OBJECT_NAME FORMAT A20
SQL>
SQL> SELECT OBJECT_ID,OBJECT_NAME FROM DBA_OBJECTS WHERE OBJECT_NAME='TEST_HWM';
OBJECT_ID OBJECT_NAME
---------- --------------------
52513 TEST_HWM
SQL> SELECT EXTENT_ID,FILE_ID,RELATIVE_FNO,BLOCK_ID,BLOCKS FROM DBA_EXTENTS WHERE SEGMENT_NAME='TEST_HWM';
EXTENT_ID FILE_ID RELATIVE_FNO BLOCK_ID BLOCKS
---------- ---------- ------------ ---------- ----------
0 6 6 265 8
SQL> ALTER SYSTEM DUMP DATAFILE 6 BLOCK 265;
###########################################DUMP 结果########################################################
[oracle@ccitca udump]$ cat orcl_ora_3546.trc
/db/oracle/admin/orcl/udump/orcl_ora_3546.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
ORACLE_HOME = /db/oracle/product/10.2.0/db_1
System name: Linux
Node name: ccitca
Release: 2.6.18-164.el5
Version: #1 SMP Tue Aug 18 15:51:54 EDT 2009
Machine: i686
Instance name: orcl
Redo thread mounted by this instance: 1
Oracle process number: 15
Unix process pid: 3546, image: oracle@ccitca (TNS V1-V3)
*** 2012-05-09 15:25:57.526
*** ACTION NAME:() 2012-05-09 15:25:57.526
*** MODULE NAME:(SQL*Plus) 2012-05-09 15:25:57.526
*** SERVICE NAME:(SYS$USERS) 2012-05-09 15:25:57.526
*** SESSION ID:(159.5) 2012-05-09 15:25:57.526
Start dump data blocks tsn: 7 file#: 6 minblk 265 maxblk 265
buffer tsn: 7 rdba: 0x01800109 (6/265)
scn: 0x0000.00092080 seq: 0x01 flg: 0x00 tail: 0x20802001
frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK
Hex dump of block: st=0, typ_found=1
Dump of memory from 0x0DCCA400 to 0x0DCCC400
DCCA400 0000A220 01800109 00092080 00010000 [ ........ ......]
DCCA410 00000000 00000000 00000000 00000000 [................]
Repeat 2 times
DCCA440 00000000 00000000 00000000 00000004 [................]
DCCA450 FFFFFFFF 00000005 00000003 00000008 [................]
DCCA460 00010001 00000000 00000000 00000000 [................]
DCCA470 00000000 00000003 00000000 00000000 [................]
DCCA480 00000000 00000000 00000000 00000000 [................]
DCCA490 0180010A 00000000 00000000 00000003 [................]
DCCA4A0 00000008 0180010C 00000000 00000000 [................]
DCCA4B0 00000000 00000000 00000000 00000001 [................]
DCCA4C0 0000CD21 00000000 00000000 01800109 [!...............]
DCCA4D0 00000008 00000000 00000000 00000000 [................]
DCCA4E0 00000000 00000000 00000000 00000000 [................]
Repeat 9 times
DCCA580 00000000 00000000 00000000 00001011 [................]
DCCA590 00000000 00000000 00000000 00000000 [................]
Repeat 485 times
DCCC3F0 00000000 00000000 00000000 20802001 [............. . ]
Dump of First Level Bitmap Block
--------------------------------
nbits : 4 nranges: 1 parent dba: 0x0180010a poffset: 0
unformatted: 5 total: 8 first useful block: 3
owning instance : 1
instance ownership changed at
Last successful Search
Freeness Status: nf1 0 nf2 0 nf3 0 nf4 0
Extent Map Block Offset: 4294967295
First free datablock : 3
Bitmap block lock opcode 0
Locker xid: : 0x0000.000.00000000
Inc #: 0 Objd: 52513
HWM Flag: HWM Set
Highwater:: 0x0180010c ext#: 0 blk#: 3 ext size: 8
#blocks in seg. hdr's freelists: 0
#blocks below: 0
mapblk 0x00000000 offset: 0
--------------------------------------------------------
DBA Ranges :
--------------------------------------------------------
0x01800109 Length: 8 Offset: 0
0:Metadata 1:Metadata 2:Metadata 3:unformatted
4:unformatted 5:unformatted 6:unformatted 7:unformatted
--------------------------------------------------------
End dump data blocks tsn: 7 file#: 6 minblk 265 maxblk 265
[oracle@ccitca udump]$
########################################插入1000条数据再DUMP#####################################
SQL> DECLARE
2 I NUMBER(10);
3 BEGIN
4 FOR I IN 1..1000 LOOP
5 INSERT INTO TEST_HWM VALUES(I,'TEST_HWM');
6 END LOOP;
7 COMMIT;
8 END;
9 /
PL/SQL procedure successfully completed.
SQL> ALTER SYSTEM DUMP DATAFILE 6 BLOCK 265;
[oracle@ccitca udump]$ cat orcl_ora_3747.trc
/db/oracle/admin/orcl/udump/orcl_ora_3747.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
ORACLE_HOME = /db/oracle/product/10.2.0/db_1
System name: Linux
Node name: ccitca
Release: 2.6.18-164.el5
Version: #1 SMP Tue Aug 18 15:51:54 EDT 2009
Machine: i686
Instance name: orcl
Redo thread mounted by this instance: 1
Oracle process number: 15
Unix process pid: 3747, image: oracle@ccitca (TNS V1-V3)
*** 2012-05-09 15:54:32.959
*** ACTION NAME:() 2012-05-09 15:54:32.958
*** MODULE NAME:(SQL*Plus) 2012-05-09 15:54:32.958
*** SERVICE NAME:(SYS$USERS) 2012-05-09 15:54:32.958
*** SESSION ID:(159.7) 2012-05-09 15:54:32.958
Start dump data blocks tsn: 7 file#: 6 minblk 265 maxblk 265
buffer tsn: 7 rdba: 0x01800109 (6/265)
scn: 0x0000.000924b3 seq: 0x01 flg: 0x00 tail: 0x24b32001
frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK
Hex dump of block: st=0, typ_found=1
Dump of memory from 0x0D946600 to 0x0D948600
D946600 0000A220 01800109 000924B3 00010000 [ ........$......]
D946610 00000000 00000000 00000000 00000000 [................]
Repeat 2 times
D946640 00000000 00000000 00000000 00000004 [................]
D946650 FFFFFFFF 00000000 00000003 00000008 [................]
D946660 00010001 00000000 00000000 00000001 [................]
D946670 00000002 00000004 4FAA224A 4FAA224A [........J".OJ".O]
D946680 00000000 00000000 00000000 00000000 [................]
D946690 0180010A 00000000 00000000 00000008 [................]
D9466A0 00000008 01800111 00000000 00000000 [................]
D9466B0 00000000 00000005 00000000 00000001 [................]
D9466C0 0000CD21 00000000 00000000 01800109 [!...............]
D9466D0 00000008 00000000 00000000 00000000 [................]
D9466E0 00000000 00000000 00000000 00000000 [................]
Repeat 9 times
D946780 00000000 00000000 00000000 51451111 [..............EQ]
D946790 00000000 00000000 00000000 00000000 [................]
Repeat 485 times
D9485F0 00000000 00000000 00000000 24B32001 [............. .$]
Dump of First Level Bitmap Block
--------------------------------
nbits : 4 nranges: 1 parent dba: 0x0180010a poffset: 0
unformatted: 0 total: 8 first useful block: 3
owning instance : 1
instance ownership changed at 05/09/2012 15:52:42
Last successful Search 05/09/2012 15:52:42
Freeness Status: nf1 0 nf2 0 nf3 1 nf4 2
Extent Map Block Offset: 4294967295
First free datablock : 4
Bitmap block lock opcode 0
Locker xid: : 0x0000.000.00000000
Inc #: 0 Objd: 52513
HWM Flag: HWM Set
Highwater:: 0x01800111 ext#: 0 blk#: 8 ext size: 8
#blocks in seg. hdr's freelists: 0
#blocks below: 5
mapblk 0x00000000 offset: 0
--------------------------------------------------------
DBA Ranges :
--------------------------------------------------------
0x01800109 Length: 8 Offset: 0
0:Metadata 1:Metadata 2:Metadata 3:FULL
4:50-75% free 5:75-100% free 6:75-100% free 7:FULL
--------------------------------------------------------
End dump data blocks tsn: 7 file#: 6 minblk 265 maxblk 265
################################插入2000条数据再DUMP##################################
SQL> DECLARE
2 I NUMBER(10);
3 BEGIN
4 FOR I IN 1001..2000 LOOP
5 INSERT INTO TEST_HWM VALUES(I,'TEST_HWM_2000');
6 END LOOP;
7 COMMIT;
8 END;
9 /
PL/SQL procedure successfully completed.
SQL> ALTER SYSTEM DUMP DATAFILE 6 BLOCK 265;
[oracle@ccitca udump]$ cat orcl_ora_3747.trc
/db/oracle/admin/orcl/udump/orcl_ora_3747.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
ORACLE_HOME = /db/oracle/product/10.2.0/db_1
System name: Linux
Node name: ccitca
Release: 2.6.18-164.el5
Version: #1 SMP Tue Aug 18 15:51:54 EDT 2009
Machine: i686
Instance name: orcl
Redo thread mounted by this instance: 1
Oracle process number: 15
Unix process pid: 3747, image: oracle@ccitca (TNS V1-V3)
*** 2012-05-09 15:54:32.959
*** ACTION NAME:() 2012-05-09 15:54:32.958
*** MODULE NAME:(SQL*Plus) 2012-05-09 15:54:32.958
*** SERVICE NAME:(SYS$USERS) 2012-05-09 15:54:32.958
*** SESSION ID:(159.7) 2012-05-09 15:54:32.958
Start dump data blocks tsn: 7 file#: 6 minblk 265 maxblk 265
buffer tsn: 7 rdba: 0x01800109 (6/265)
scn: 0x0000.000924b3 seq: 0x01 flg: 0x00 tail: 0x24b32001
frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK
Hex dump of block: st=0, typ_found=1
Dump of memory from 0x0D946600 to 0x0D948600
D946600 0000A220 01800109 000924B3 00010000 [ ........$......]
D946610 00000000 00000000 00000000 00000000 [................]
Repeat 2 times
D946640 00000000 00000000 00000000 00000004 [................]
D946650 FFFFFFFF 00000000 00000003 00000008 [................]
D946660 00010001 00000000 00000000 00000001 [................]
D946670 00000002 00000004 4FAA224A 4FAA224A [........J".OJ".O]
D946680 00000000 00000000 00000000 00000000 [................]
D946690 0180010A 00000000 00000000 00000008 [................]
D9466A0 00000008 01800111 00000000 00000000 [................]
D9466B0 00000000 00000005 00000000 00000001 [................]
D9466C0 0000CD21 00000000 00000000 01800109 [!...............]
D9466D0 00000008 00000000 00000000 00000000 [................]
D9466E0 00000000 00000000 00000000 00000000 [................]
Repeat 9 times
D946780 00000000 00000000 00000000 51451111 [..............EQ]
D946790 00000000 00000000 00000000 00000000 [................]
Repeat 485 times
D9485F0 00000000 00000000 00000000 24B32001 [............. .$]
Dump of First Level Bitmap Block
--------------------------------
nbits : 4 nranges: 1 parent dba: 0x0180010a poffset: 0
unformatted: 0 total: 8 first useful block: 3
owning instance : 1
instance ownership changed at 05/09/2012 15:52:42
Last successful Search 05/09/2012 15:52:42
Freeness Status: nf1 0 nf2 0 nf3 1 nf4 2
Extent Map Block Offset: 4294967295
First free datablock : 4
Bitmap block lock opcode 0
Locker xid: : 0x0000.000.00000000
Inc #: 0 Objd: 52513
HWM Flag: HWM Set
Highwater:: 0x01800111 ext#: 0 blk#: 8 ext size: 8
#blocks in seg. hdr's freelists: 0
#blocks below: 5
mapblk 0x00000000 offset: 0
--------------------------------------------------------
DBA Ranges :
--------------------------------------------------------
0x01800109 Length: 8 Offset: 0
0:Metadata 1:Metadata 2:Metadata 3:FULL
4:50-75% free 5:75-100% free 6:75-100% free 7:FULL
--------------------------------------------------------
End dump data blocks tsn: 7 file#: 6 minblk 265 maxblk 265
*** 2012-05-09 15:59:51.677
Start dump data blocks tsn: 7 file#: 6 minblk 265 maxblk 265
buffer tsn: 7 rdba: 0x01800109 (6/265)
scn: 0x0000.00092566 seq: 0x02 flg: 0x00 tail: 0x25662002
frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK
Hex dump of block: st=0, typ_found=1
Dump of memory from 0x0D946600 to 0x0D948600
D946600 0000A220 01800109 00092566 00020000 [ .......f%......]
D946610 00000000 00000000 00000000 00000000 [................]
Repeat 2 times
D946640 00000000 00000000 00000000 00000004 [................]
D946650 FFFFFFFF 00000000 00000003 00000010 [................]
D946660 00010002 00000000 00000001 00000000 [................]
D946670 00000007 00000008 4FAA23AC 4FAA23AC [.........#.O.#.O]
D946680 00000000 00000000 00000000 00000000 [................]
D946690 0180010A 00000000 00000001 00000008 [................]
D9466A0 00000008 01800119 00000000 00000001 [................]
D9466B0 00000000 0000000D 00000000 00000001 [................]
D9466C0 0000CD21 00000000 00000000 01800109 [!...............]
D9466D0 00000008 00000000 01800111 00000008 [................]
D9466E0 00000008 00000000 00000000 00000000 [................]
D9466F0 00000000 00000000 00000000 00000000 [................]
Repeat 8 times
D946780 00000000 00000000 00000000 11111111 [................]
D946790 53555555 00000000 00000000 00000000 [UUUS............]
D9467A0 00000000 00000000 00000000 00000000 [................]
Repeat 484 times
D9485F0 00000000 00000000 00000000 25662002 [............. f%]
Dump of First Level Bitmap Block
--------------------------------
nbits : 4 nranges: 2 parent dba: 0x0180010a poffset: 0
unformatted: 0 total: 16 first useful block: 3
owning instance : 1
instance ownership changed at 05/09/2012 15:58:36
Last successful Search 05/09/2012 15:58:36
Freeness Status: nf1 0 nf2 1 nf3 0 nf4 7
Extent Map Block Offset: 4294967295
First free datablock : 8
Bitmap block lock opcode 0
Locker xid: : 0x0000.000.00000000
Inc #: 0 Objd: 52513
HWM Flag: HWM Set
Highwater:: 0x01800119 ext#: 1 blk#: 8 ext size: 8
#blocks in seg. hdr's freelists: 0
#blocks below: 13
mapblk 0x00000000 offset: 1
--------------------------------------------------------
DBA Ranges :
--------------------------------------------------------
0x01800109 Length: 8 Offset: 0
0x01800111 Length: 8 Offset: 8
0:Metadata 1:Metadata 2:Metadata 3:FULL
4:FULL 5:FULL 6:FULL 7:FULL
8:75-100% free 9:75-100% free 10:75-100% free 11:75-100% free
12:75-100% free 13:75-100% free 14:75-100% free 15:25-50% free
--------------------------------------------------------
End dump data blocks tsn: 7 file#: 6 minblk 265 maxblk 265
[oracle@ccitca udump]$
#####################################查看执行计划###################################
SQL> SET AUTOTRACE TRACEONLY
SQL> SET TIMING ON
SQL> SELECT COUNT(*) FROM TEST_HWM;
Elapsed: 00:00:00.05
Execution Plan
----------------------------------------------------------
Plan hash value: 2326001506
-----------------------------------------------------------------------
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
-----------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 5 (0)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | | |
| 2 | TABLE ACCESS FULL| TEST_HWM | 2000 | 5 (0)| 00:00:01 |
-----------------------------------------------------------------------
Note
-----
- dynamic sampling used for this statement
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
16 consistent gets
0 physical reads
0 redo size
411 bytes sent via SQL*Net to client
385 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
########################################分析表####################################################
SQL>
SQL> BEGIN
2 DBMS_STATS.GATHER_TABLE_STATS(OWNNAME=>'HWM',
3 TABNAME=>'TEST_HWM',
4 PARTNAME=>NULL);
5 END;
6 /
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.73
SQL> SET LINE 140
SQL> SELECT NUM_ROWS,BLOCKS,EMPTY_BLOCKS FROM DBA_TABLES WHERE TABLE_NAME='TEST_HWM';
Elapsed: 00:00:00.02
Execution Plan
----------------------------------------------------------
Plan hash value: 3561033063
-------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 2 | 324 | 28 (4)| 00:00:01 |
|* 1 | HASH JOIN | | 2 | 324 | 28 (4)| 00:00:01 |
| 2 | MERGE JOIN CARTESIAN | | 2 | 298 | 27 (0)| 00:00:01 |
| 3 | NESTED LOOPS OUTER | | 2 | 188 | 27 (0)| 00:00:01 |
| 4 | NESTED LOOPS OUTER | | 2 | 182 | 25 (0)| 00:00:01 |
| 5 | NESTED LOOPS OUTER | | 2 | 168 | 23 (0)| 00:00:01 |
| 6 | NESTED LOOPS OUTER | | 2 | 160 | 23 (0)| 00:00:01 |
| 7 | NESTED LOOPS | | 2 | 138 | 21 (0)| 00:00:01 |
| 8 | NESTED LOOPS | | 2 | 132 | 19 (0)| 00:00:01 |
| 9 | NESTED LOOPS | | 2 | 62 | 18 (0)| 00:00:01 |
|* 10 | TABLE ACCESS BY INDEX ROWID| OBJ$ | 2 | 56 | 16 (0)| 00:00:01 |
|* 11 | INDEX SKIP SCAN | I_OBJ2 | 2 | | 15 (0)| 00:00:01 |
| 12 | TABLE ACCESS CLUSTER | USER$ | 1 | 3 | 1 (0)| 00:00:01 |
|* 13 | INDEX UNIQUE SCAN | I_USER# | 1 | | 0 (0)| 00:00:01 |
|* 14 | TABLE ACCESS CLUSTER | TAB$ | 1 | 35 | 1 (0)| 00:00:01 |
|* 15 | INDEX UNIQUE SCAN | I_OBJ# | 1 | | 0 (0)| 00:00:01 |
| 16 | TABLE ACCESS CLUSTER | TS$ | 1 | 3 | 1 (0)| 00:00:01 |
|* 17 | INDEX UNIQUE SCAN | I_TS# | 1 | | 0 (0)| 00:00:01 |
| 18 | TABLE ACCESS CLUSTER | SEG$ | 1 | 11 | 1 (0)| 00:00:01 |
|* 19 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 1 | | 0 (0)| 00:00:01 |
|* 20 | INDEX UNIQUE SCAN | I_OBJ1 | 1 | 4 | 0 (0)| 00:00:01 |
| 21 | TABLE ACCESS BY INDEX ROWID | OBJ$ | 1 | 7 | 1 (0)| 00:00:01 |
|* 22 | INDEX UNIQUE SCAN | I_OBJ1 | 1 | | 0 (0)| 00:00:01 |
| 23 | TABLE ACCESS CLUSTER | USER$ | 1 | 3 | 1 (0)| 00:00:01 |
|* 24 | INDEX UNIQUE SCAN | I_USER# | 1 | | 0 (0)| 00:00:01 |
| 25 | BUFFER SORT | | 1 | 55 | 26 (0)| 00:00:01 |
|* 26 | FIXED TABLE FULL | X$KSPPI | 1 | 55 | 0 (0)| 00:00:01 |
| 27 | FIXED TABLE FULL | X$KSPPCV | 100 | 1300 | 0 (0)| 00:00:01 |
-------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - access("KSPPI"."INDX"="KSPPCV"."INDX")
10 - filter(BITAND("O"."FLAGS",128)=0)
11 - access("O"."NAME"='TEST_HWM')
filter("O"."NAME"='TEST_HWM')
13 - access("O"."OWNER#"="U"."USER#")
14 - filter(BITAND("T"."PROPERTY",1)=0)
15 - access("O"."OBJ#"="T"."OBJ#")
17 - access("T"."TS#"="TS"."TS#")
19 - access("T"."TS#"="S"."TS#"(+) AND "T"."FILE#"="S"."FILE#"(+) AND
"T"."BLOCK#"="S"."BLOCK#"(+))
20 - access("T"."BOBJ#"="CO"."OBJ#"(+))
22 - access("T"."DATAOBJ#"="CX"."OBJ#"(+))
24 - access("CX"."OWNER#"="CU"."USER#"(+))
26 - filter("KSPPI"."KSPPINM"='_dml_monitoring_enabled')
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
45 consistent gets
0 physical reads
0 redo size
534 bytes sent via SQL*Net to client
385 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
1 sorts (memory)
0 sorts (disk)
1 rows processed
SQL>
SQL> SELECT NUM_ROWS,BLOCKS,EMPTY_BLOCKS FROM DBA_TABLES WHERE TABLE_NAME='TEST_HWM';
NUM_ROWS BLOCKS EMPTY_BLOCKS
---------- ---------- ------------
2000 13 0
##########################################删除数据###########################################
SQL> DELETE FROM TEST_HWM;
2000 rows deleted.
SQL> COMMIT;
Commit complete.
SQL> SELECT NUM_ROWS,BLOCKS,EMPTY_BLOCKS FROM DBA_TABLES WHERE TABLE_NAME='TEST_HWM';
NUM_ROWS BLOCKS EMPTY_BLOCKS
---------- ---------- ------------
2000 13 0
SQL> SELECT COUNT(*) FROM TEST_HWM;
Elapsed: 00:00:00.01
Execution Plan
----------------------------------------------------------
Plan hash value: 2326001506
-----------------------------------------------------------------------
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
-----------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 5 (0)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | | |
| 2 | TABLE ACCESS FULL| TEST_HWM | 2000 | 5 (0)| 00:00:01 |
-----------------------------------------------------------------------
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
16 consistent gets
0 physical reads
0 redo size
410 bytes sent via SQL*Net to client
385 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
############################# 删除数据库后查看表空间段使用情况##################################################
VAR TOTAL_BLOCKS NUMBER
VAR TOTAL_BYTES NUMBER
VAR UNUSED_BLOCKS NUMBER
VAR UNUSED_BYTES NUMBER
VAR LAST_USED_EXTENT_FILE_ID NUMBER
VAR LAST_USED_EXTENT_BLOCK_ID NUMBER
VAR LAST_USED_BLOCK NUMBER
EXEC DBMS_SPACE.UNUSED_SPACE
('HWM','TEST_HWM','TABLE',:TOTAL_BLOCKS,:TOTAL_BYTES,:UNUSED_BLOCKS,:UNUSED_BYTES,:LAST_USED_EXTENT_FILE_ID,:LAST_USED_EXTENT_BLOCK_ID,:LAST_USED_BLOCK);
PRINT TOTAL_BLOCKS
PRINT TOTAL_BYTES
PRINT UNUSED_BLOCKS
PRINT UNUSED_BYTES
PRINT LAST_USED_EXTENT_FILE_ID
PRINT LAST_USED_EXTENT_BLOCK_ID
PRINT LAST_USED_BLOCK
SQL>
TOTAL_BLOCKS
------------
16
SQL>
TOTAL_BYTES
-----------
131072
SQL>
UNUSED_BLOCKS
-------------
0
SQL>
UNUSED_BYTES
------------
0
SQL>
LAST_USED_EXTENT_FILE_ID
------------------------
6
SQL>
LAST_USED_EXTENT_BLOCK_ID
-------------------------
273
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