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----------------------------

--dbcc page內容解釋

--author:boyi55

----------------------------

dbcc page ( {'dbname' | dbid}, filenum, pagenum [, printopt={0|1|2|3} ])

The printopt parameter has the following meanings:

0 - print just the page header
1 - page header plus per-row hex dumps and a dump of the page slot array (unless its a page that doesn't have one, like allocation bitmaps)
2 - page header plus whole page hex dump
3 - page header plus detailed per-row interpretation

=========================

dbcc traceon(3604)
dbcc page(northwind,1,100,1)
go
=========================?
數據文件的頁面結構（管理頁面比較重要）
0?文件頭頁面?1 PFS?頁面?2 GAM?頁面?3 SGAM?頁面?6 DCM?頁面?7 BCM?頁面
一個GAM?和一個SGAM?可以管理4GB?的數據空間

==========================

DBCC?執行完畢。如果?DBCC?輸出了錯誤信息，請與系統管理員聯系。

PAGE: (1:100)
-------------

BUFFER:
-------
內存中頁面的管理信息

BUF @0x19217B80--?內存中頁號?
---------------
bpage = 0x19A3C000?（對應物理頁面?）? bhash = 0x00000000?（hash?）?bpageno = (1:100)?（對應物理文件的頁面號?）
bdbid = 6 (?對應的數據庫ID?）?????????????? breferences = 0?????????? bstat = 0x9
bspin = 0????????????????????????? bnext = 0x00000000???????

PAGE HEADER:
------------
頁頭：96?字節?
Page @0x19A3C000
----------------
m_pageId = (1:100)?（頁號?）?? m_headerVersion = 1?????????????????????? m_type = 1 （數據頁類型，1：堆表和聚集索引的葉子節點數據）
m_typeFlagBits = 0x0???????? m_level = 0?（索引級別?）????????????????? m_flagBits = 0x8000
m_objId = 2041058307?（對應表ID?）? m_indexId = 0??????????????????????? m_prevPage = (0:0)
m_nextPage = (0:0)?????????? pminlen = 8?????????????????????????????? m_slotCnt = 8?（頁面中數據的行數，八行?）
m_freeCnt = 7504?（空余空間?）? m_freeData = 672?（空余空間偏移量，已用空間數?）?????? m_reservedCnt = 0
m_lsn = (4:270:16)?????????? m_xactReserved = 0??????????????????????? m_xdesId = (0:0)
m_ghostRecCnt = 0??????????? m_tornBits = 1???????????

Allocation Status
-----------------
GAM (1:2) = ALLOCATED?（管理盤區位于第三個頁面編號2?）??? SGAM (1:3) = ALLOCATED?（管理混合盤區位于第四個頁面編號是三??）
PFS (1:1) = 0x60 MIXED_EXT ALLOCATED?? 0_PCT_FULL?? DIFF (1:6) = CHANGED
ML (1:7) = NOT MIN_LOGGED

DATA:
-----

Slot 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???????????????????? .....

Slot 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???????????????????? .......

Slot 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.......

Slot 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 ......._.......

Slot 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.......

Slot 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.......

Slot 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?????????????????????????????? .

Slot 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?????????????????????????????? .

OFFSET TABLE:
-------------
Row - Offset???96?（頁頭）+?（672-96?）（數據空間）+7504?（空余空間）+16?（行偏移指針數組）=8192?（頁面大小）
8190-8191 slot0
...
...???行偏移數組
8176-8177 slot7
672-8175?空余空間??????????
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?執行完畢。如果?DBCC?輸出了錯誤信息，請與系統管理員聯系。
============================================

create table demodb1..table10(
id int not null,
name char(5) not null,
address char(10) null)

select * from demodb1..sysindexes
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
無數據?first?為指向第一列或者根頁的指針。

=============================================

insert into 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

first 0x0F?編號十五頁

=================================
create table table11(id int,name text)

select * from demodb1..sysindexes
where id=object_id('demodb1..table11')

insert into demodb1..table11 values(1,'boyi55')

=================================
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?編號三十頁
first 0x1C?編號二十八頁

=====================
DBCC?執行完畢。如果?DBCC?輸出了錯誤信息，請與系統管理員聯系。

PAGE: (1:30)
------------

BUFFER:
-------

BUF @0x192192C0
---------------
bpage = 0x19AF6000??????? bhash = 0x00000000??????? bpageno = (1:30)
bdbid = 7???????????????? breferences = 1?????????? bstat = 0xb
bspin = 0???????????????? bnext = 0x00000000???????

PAGE HEADER:
------------

Page @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???????????

Allocation 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

name???????????????????????????? = [TextPointer]
------------------------------------------------
TextTimeStamp = 13172736? RowId = (1:28:0)?
指針指向頁號28.?

DBCC?執行完畢。如果?DBCC?輸出了錯誤信息，請與系統管理員聯系。
==============================
sp_tableoption table11,'text in row',1000

update table11 set name='boyi55555' where id =1

DBCC?執行完畢。如果?DBCC?輸出了錯誤信息，請與系統管理員聯系。

PAGE: (1:30)
------------

BUFFER:
-------

BUF @0x192192C0
---------------
bpage = 0x19AF6000??????? bhash = 0x00000000??????? bpageno = (1:30)
bdbid = 7???????????????? breferences = 4?????????? bstat = 0xb
bspin = 0???????????????? bnext = 0x00000000???????

PAGE HEADER:
------------

Page @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???????????

Allocation 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

Slot 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?執行完畢。如果?DBCC?輸出了錯誤信息，請與系統管理員聯系。

=============================================
DBCC EXTENTINFO?得到屬于一個對象的所有盤區的列表
dbcc traceon(3604)
dbcc extentinfo(northwind,categories)

DBCC?執行完畢。如果?DBCC?輸出了錯誤信息，請與系統管理員聯系。
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

（所影響的行數為?12?行）

DBCC?執行完畢。如果?DBCC?輸出了錯誤信息，請與系統管理員聯系。

page_id?對應于obj_id

dbcc traceon(3604)
dbcc extentinfo(northwind)
用法：DBCC EXTENTINFO(dbname,tablename,indexid)

from csdn? http://blog.csdn.net/laohan8848/archive/2010/05/25/5622166.aspx

MSSQL 數據頁查詢使他 DBCC PAGE 詳細說明

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