dbcc page(northwind,1,100,1)
go
=========================
数据文件的页面结构（管理页面
比较重要）
0
文件头页面 1 PFS
页
面 2 GAM
页面 3 SGAM
页面 6 DCM
页面 7 BCM
页面
一个GAM
和一个SGAM
可以管理4GB
的数据空间
执行完毕。如果 DBCC
输出了错误信息，请与系统管理员联系。
(1:100)
-------------
-------
内存中页面的管理信息
@0x19217B80--
内存中页号
---------------
bpage = 0x19A3C000
（对应物理
页面
） bhash = 0x00000000
（hash
） bpageno = (1:100)
（对应物理文件的页面号
）
bdbid = 6 (
对应的数据库ID
） breferences = 0 bstat = 0x9
bspin
= 0 bnext = 0x00000000
HEADER:
------------
页头：96
字节
Page
@0x19A3C000
----------------
m_pageId = (1:100)
（页号
） m_headerVersion = 1 m_type = 1
m_typeFlagBits
= 0x0 m_level = 0
（索引级别
） m_flagBits = 0x8000
m_objId =
2041058307
（对应表ID
） m_indexId = 0 m_prevPage = (0:0)
m_nextPage
= (0:0) pminlen = 8 m_slotCnt =
8
（页面中数据的行数，八行
）
m_freeCnt = 7504
（空余空间
） m_freeData = 672
（空余空间偏
移量，已用空间数
） m_reservedCnt = 0
m_lsn =
(4:270:16) m_xactReserved = 0 m_xdesId =
(0:0)
m_ghostRecCnt = 0 m_tornBits = 1
Status
-----------------
GAM (1:2) = ALLOCATED
（管理盘区位于第三个页面编号2
） SGAM (1:3) = ALLOCATED
（管理混合盘区位于第四个页面编号是三
）
PFS (1:1) = 0x60 MIXED_EXT ALLOCATED 0_PCT_FULL
DIFF (1:6) = CHANGED
ML (1:7) = NOT MIN_LOGGED
-----
0, Offset 0x60
-------------------
Record Type =
PRIMARY_RECORD
Record Attributes =
NULL_BITMAP VARIABLE_COLUMNS
19a3c060: 00080030 00000001
03000004 35002500 0............%.5
19a3c070: 42804580 76006500
72006500 67006100 .E.B.e.v.e.r.a.g
19a3c080: 73006500 87000000
00000000 00005f00 .e.s........._..
19a3c090: 01000100 88000000
00000000 00005f00 ............._..
19a3c0a0: 03000100
00 .....
1, Offset 0xa5
-------------------
Record Type =
PRIMARY_RECORD
Record Attributes =
NULL_BITMAP VARIABLE_COLUMNS
19a3c0a5: 00080030 00000002
03000004 37002700 0............'.7
19a3c0b5: 43804780 6e006f00
69006400 65006d00 .G.C.o.n.d.i.m.e
19a3c0c5: 74006e00 00007300
00008900 5f000000 .n.t.s........._
19a3c0d5: 01000000 00000500
00008a00 5f000000 ..............._
19a3c0e5: 01000000
000700 .......
2, Offset 0xec
-------------------
Record Type =
PRIMARY_RECORD
Record Attributes =
NULL_BITMAP VARIABLE_COLUMNS
19a3c0ec: 00080030 00000003
03000004 39002900 0............).9
19a3c0fc: 43804980 6e006f00
65006600 74006300 .I.C.o.n.f.e.c.t
19a3c10c: 6f006900 73006e00
8b000000 00000000 .i.o.n.s........
19a3c11c: 00005f00 09000100
8c000000 00000000 ._..............
19a3c12c: 00006900
01000100 00 .i.......
3, Offset 0x135
--------------------
Record Type =
PRIMARY_RECORD
Record Attributes =
NULL_BITMAP VARIABLE_COLUMNS
19a3c135: 00080030 00000004
03000004 3f002f00 0............/.?
19a3c145: 44804f80 69006100
79007200 50002000 .O.D.a.i.r.y. .P
19a3c155: 6f007200 75006400
74006300 00007300 .r.o.d.u.c.t.s..
19a3c165: 00008d00 5f000000
01000000 00000a00 ......._........
19a3c175: 00008e00 5f000000
01000000 000b00 ......._.......
4, Offset 0x184
--------------------
Record Type =
PRIMARY_RECORD
Record Attributes =
NULL_BITMAP VARIABLE_COLUMNS
19a3c184: 00080030 00000005
03000004 3f002f00 0............/.?
19a3c194: 47804f80 61007200
6e006900 2f007300 .O.G.r.a.i.n.s./
19a3c1a4: 65004300 65007200
6c006100 00007300 .C.e.r.e.a.l.s..
19a3c1b4: 00008f00 5f000000
01000000 00000c00 ......._........
19a3c1c4: 00009000 6c000000
01000000 000100 .......l.......
5, Offset 0x1d3
--------------------
Record Type =
PRIMARY_RECORD
Record Attributes =
NULL_BITMAP VARIABLE_COLUMNS
19a3c1d3: 00080030 00000006
03000004 3b002b00 0............+.;
19a3c1e3: 4d804b80 61006500
2f007400 6f005000 .K.M.e.a.t./.P.o
19a3c1f3: 6c007500 72007400
00007900 00009100 .u.l.t.r.y......
19a3c203: 69000000 01000000
00000400 00009200 ...i............
19a3c213: 69000000 01000000
000500 ...i.......
6, Offset 0x21e
--------------------
Record Type =
PRIMARY_RECORD
Record Attributes =
NULL_BITMAP VARIABLE_COLUMNS
19a3c21e: 00080030 00000007
03000004 31002100 0............!.1
19a3c22e: 50804180 6f007200
75006400 65006300 .A.P.r.o.d.u.c.e
19a3c23e: 93000000 00000000
00006900 06000100 .........i......
19a3c24e: 94000000 00000000
00007200 01000100 .........r......
19a3c25e:
00 .
7, Offset 0x25f
--------------------
Record Type =
PRIMARY_RECORD
Record Attributes =
NULL_BITMAP VARIABLE_COLUMNS
19a3c25f: 00080030 00000008
03000004 31002100 0............!.1
19a3c26f: 53804180 61006500
6f006600 64006f00 .A.S.e.a.f.o.o.d
19a3c27f: 95000000 00000000
00006900 07000100 .........i......
19a3c28f: 96000000 00000000
00006900 08000100 .........i......
19a3c29f:
00 .
TABLE:
-------------
Row - Offset 96
（页头）+
（672-96
）（数据空间）+7504
（空余空间）+16
（行偏移指针数组）=8192
（页面大小）
8190-8191
slot0
...
...
行偏移数组
8176-8177 slot7
672-8175
空余空间
7 (0x7) - 607 (0x25f) 607-671
6 (0x6) -
542 (0x21e) 542-606
5 (0x5) - 467 (0x1d3) 467-541
4 (0x4)
- 388 (0x184) 388-466
3 (0x3) - 309 (0x135) 309-387
2
(0x2) - 236 (0xec) 236-308
1 (0x1) - 165 (0xa5) 165-235
0
(0x0) - 96 (0x60) 96-164
0-95 pageheader
DBCC
执行完毕。如果 DBCC
输出了错误信息，请与系统管理员联系。
============================================
id int not null,
name
char(5) not null,
address char(10) null)
where
id=object_id('demodb1..table10')
============================================
id
status first indid root minlen keycnt groupid
dpages reserved used rowcnt rowmodctr
reserved3 reserved4 xmaxlen maxirow OrigFillFactor StatVersion
reserved2 FirstIAM impid lockflags pgmodctr
keys
name
statblob
maxlen rows
----------- ----------- --------------
------ -------------- ------
1977058079 0 0x000000000000
0 0x000000000000 23 0 1 0 0
0 0 0 0 0 40
0 0 0 0 0x000000000000 -1
0 0
NULL
table10
NULL
8000 0
无数据 first
为指向第一列或者根页的指针。
demodb1..table10(id,name,address)values(1,'abcde','suzhou')
=================================
id
status first indid root minlen keycnt groupid
dpages reserved used rowcnt rowmodctr
reserved3 reserved4 xmaxlen maxirow OrigFillFactor StatVersion
reserved2 FirstIAM impid lockflags pgmodctr
keys
name
statblob
maxlen rows
----------- ----------- --------------
------ -------------- ------ ------
1977058079 0 0x0F0000000100
0 0x0F0000000100
23 0 1 1 2 2
1 1 0 0 40 0
0 0 0 0x190000000100 -1 0
0
NULL
table10
NULL
8000 1
编号十五页
create table
table11(id int,name text)
where
id=object_id('demodb1..table11')
id
status first indid root minlen keycnt groupid
dpages reserved used rowcnt rowmodctr
reserved3 reserved4 xmaxlen maxirow OrigFillFactor StatVersion
reserved2 FirstIAM impid lockflags pgmodctr
keys
name
statblob
maxlen rows
----------- ----------- --------------
------ -------------- ------
1993058136 0 0x1E0000000100
0 0x1E0000000100
8 0 1 1 2 2
1 1 0 0 43 0
0 0 0 0x1F0000000100 -1 0
0
NULL
table11
NULL
8000 1
1993058136 2
0x1C0000000100
255 0x1C0000000100 0 0 1
0 2 2 0 0
0 0 0 0 0 0
0 0x1D0000000100 -1 0 0
NULL
ttable11
NULL
8000 0
first 0x1E
编号三十页
first 0x1C
编号二十八页
=====================
DBCC
执行完毕。如果 DBCC
输出了错误信息，请与系统管理员联系。
(1:30)
------------
-------
@0x192192C0
---------------
bpage = 0x19AF6000 bhash =
0x00000000 bpageno = (1:30)
bdbid = 7
breferences = 1 bstat = 0xb
bspin = 0 bnext
= 0x00000000
HEADER:
------------
@0x19AF6000
----------------
m_pageId = (1:30)
m_headerVersion = 1 m_type = 1
m_typeFlagBits = 0x0
m_level = 0 m_flagBits = 0x8000
m_objId =
1993058136 m_indexId = 0 m_prevPage = (0:0)
m_nextPage
= (0:0) pminlen = 8 m_slotCnt = 1
m_freeCnt =
8063 m_freeData = 127 m_reservedCnt = 0
m_lsn =
(5:49:1) m_xactReserved = 0 m_xdesId = (0:0)
m_ghostRecCnt
= 0 m_tornBits = 0
Status
-----------------
GAM (1:2) = ALLOCATED SGAM (1:3) =
ALLOCATED
PFS (1:1) = 0x61 MIXED_EXT ALLOCATED 50_PCT_FULL
DIFF (1:6) = CHANGED
ML (1:7) = NOT MIN_LOGGED
0 Offset 0x60
------------------
Record Type =
PRIMARY_RECORD
Record Attributes =
NULL_BITMAP VARIABLE_COLUMNS
19af6060: 00080030 00000001
01000002 00801f00 0...............
19af6070: 0000c900 1c000000
01000000 000000 ...............
id =
1
------------------------------------------------
TextTimeStamp
= 13172736 RowId = (1:28:0)
指针指向页号28.
执行完毕。如果 DBCC
输出了错误信息，请与系统管理员联系。
==============================
sp_tableoption table11,'text in row',1000
执行完毕。如果 DBCC
输出了错误信息，请与系统管理员联系。
(1:30)
------------
-------
@0x192192C0
---------------
bpage = 0x19AF6000 bhash =
0x00000000 bpageno = (1:30)
bdbid = 7
breferences = 4 bstat = 0xb
bspin = 0 bnext
= 0x00000000
HEADER:
------------
@0x19AF6000
----------------
m_pageId = (1:30)
m_headerVersion = 1 m_type = 1
m_typeFlagBits = 0x0
m_level = 0 m_flagBits = 0x8000
m_objId =
1993058136 m_indexId = 0 m_prevPage = (0:0)
m_nextPage
= (0:0) pminlen = 8 m_slotCnt = 1
m_freeCnt =
8070 m_freeData = 127 m_reservedCnt = 7
m_lsn =
(5:52:5) m_xactReserved = 7 m_xdesId = (0:188)
m_ghostRecCnt
= 0 m_tornBits = 0
Status
-----------------
GAM (1:2) = ALLOCATED SGAM (1:3) =
ALLOCATED
PFS (1:1) = 0x61 MIXED_EXT ALLOCATED 50_PCT_FULL
DIFF (1:6) = CHANGED
ML (1:7) = NOT MIN_LOGGED
0 Offset 0x60
------------------
Record Type =
PRIMARY_RECORD
Record Attributes =
NULL_BITMAP VARIABLE_COLUMNS
19af6060: 00080030 00000001
01000002 62001800 0..............b
19af6070: 3569796f
35353535 oyi55555
id
= 1
********************************************************
name = [BLOB Inline
Data]
-----------------------------------------------------
19af606f:
69796f62 35353535 35 boyi55555
DBCC
执行完毕。如果
DBCC
输出了错误信息，请与系统管理员联系。
DBCC EXTENTINFO
得到属于一个对象的所有盘区的列表
dbcc traceon(3604)
dbcc
extentinfo(northwind,categories)
DBCC
执行完毕。如果 DBCC
输出了错误信息，请与系统管理员联系。
file_id
page_id pg_alloc ext_size obj_id index_id
pfs_bytes
----------- ----------- ----------- -----------
----------- ----------- ------------------
1 98
1 1 2041058307 1 0x6000000000000000
1
100 1 1 2041058307 1
0x6000000000000000
1 389 1 1
2041058307 2 0x6000000000000000
1 95
1 1 2041058307 255 0x6200000000000000
1
97 1 1 2041058307 255
0x6400000000000000
1 103 1 1
2041058307 255 0x6400000000000000
1 104
1 1 2041058307 255 0x6400000000000000
1
105 1 1 2041058307 255
0x6200000000000000
1 106 1 1
2041058307 255 0x6400000000000000
1 107
1 1 2041058307 255 0x6400000000000000
1
108 1 1 2041058307 255
0x6200000000000000
1 112 4 8
2041058307 255 0x4444424400000000
行）
执行完毕。如果 DBCC
输出了错误信息，请与系统管理员联系。
对应于obj_id
dbcc traceon(3604)
dbcc extentinfo(northwind)
用法：DBCC EXTENTINFO(dbname,tablename,indexid)