1. Create sample db
2. Create table
3. Insert test data
use test
go
4. select data and check page number
SELECT %%physloc%% rowid, sys.fn_PhysLocFormatter (%%physloc%%) AS [Physical RID],DATALENGTH(a) a_length, DATALENGTH(b) b_length,DATALENGTH(d) d_length, *
FROM test.dbo.mytest where a<9
5. delete row and print page
6. check page 153.
0011=Bit 4 means the record has a NULL bitmap and bit 5 means the record has variable length columns
c) there is no change in the offset table, still 8 records in it.
7. wait for while and check the page again
if we insert the same data back, is it inserted into the same place? or reorganize the page?
8) insert data back again.
so confirmed the original row(a=3) is inserted into page 153, and rowid is still 1:153:2.
the page is reorganized, rows (4,5,6,7) have been moved up, and the deleted slot is overwrote. then the new row is added at the tail of the original content. here is the page, I marked the row header with red
PAGE: (1:153)
DATA:
Memory Dump @0x00000000140DA000
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00000000140DBCB0: 20202020 20202020 20202020 20202020 ?
00000000140DBCC0: 20202020 20202020 20202020 20202020 ?
00000000140DBCD0: 20202020 20202020 20202020 20202020 ?
00000000140DBCE0: 20202020 20202020 20202020 20202020 ?
00000000140DBCF0: 20202020 20202020 20202020 20202020 ?
00000000140DBD00: 20202020 20202020 00004100 73007900 ? ..A.s.y.
00000000140DBD10: 73007300 65007100 30002d00 49000000 ?s.s.e.q.0.-.I...
00000000140DBD20: 00000d00 00007f7f 00000008 00130000 ?................
00000000140DBD30: 00000001 00000008 00000000 00000000 ?................
00000000140DBD40: 00000000 00100000 80010047 0065006e ?...........G.e.n
00000000140DBD50: 00640064 006c0067 00730065 00710030 ?.d.d.l.g.s.e.q.0
00000000140DBD60: 002d0049 00000000 000e0000 007f7f00 ?.-.I............
00000000140DBD70: 00000800 13000000 00000100 00000800 ?................
00000000140DBD80: 00000000 00000000 00000000 10000080 ?................
00000000140DBD90: 01004b00 66006900 72007300 74006f00 ?..K.f.i.r.s.t.o.
00000000140DBDA0: 6f007200 64006500 72003000 2d004900 ?o.r.d.e.r.0.-.I.
00000000140DBDB0: 00000000 0f000000 7f7f0000 00080013 ?................
00000000140DBDC0: 00000000 00010000 00080000 00000000 ?................
00000000140DBDD0: 00000000 00000010 00008001 0049006c ?.............I.l
00000000140DBDE0: 00610073 0074006f 006f0072 00640065 ?.a.s.t.o.o.r.d.e
00000000140DBDF0: 00720030 002d0049 00000000 00100000 ?.r.0.-.I........
00000000140DBE00: 00383800 00000400 0a000000 00000100 ?.88.............
00000000140DBE10: 00000400 00000000 00000000 00000000 ?................
00000000140DBE20: 10000080 01004d00 6c006100 73007400 ?......M.l.a.s.t.
00000000140DBE30: 6f006f00 72006400 65007200 66007200 ?o.o.r.d.e.r.f.r.
00000000140DBE40: 30002d00 49000000 00001100 00003d3d ?0.-.I.........==
00000000140DBE50: 00000008 00170300 00000001 00000008 ?................
00000000140DBE60: 00000000 00000000 00000000 00100000 ?................
00000000140DBE70: 80010045 0064006c 00670074 0069006d ?...E.d.l.g.t.i.m
00000000140DBE80: 00650072 0030002d 00490000 00000012 ?.e.r.0.-.I......
00000000140DBE90: 0000003d 3d000000 08001703 00000000 ?...==...........
00000000140DBEA0: 01000000 08000000 00000000 00000000 ?................
00000000140DBEB0: 00001000 00800100 47006400 6c006700 ?........G.d.l.g.
00000000140DBEC0: 6f007000 65006e00 65006400 30002d00 ?o.p.e.n.e.d.0.-.
00000000140DBED0: 49000000 00001300 00003838 00000004 ?I.........88....
00000000140DBEE0: 000a0000 00000001 00000004 00000000 ?................
00000000140DBEF0: 00000000 00000000 00100000 80010043 ?...............C
00000000140DBF00: 00700072 0069006e 00630069 00640030 ?.p.r.i.n.c.i.d.0
00000000140DBF10: 002d0049 00000000 00140000 00a5a500 ?.-.I.........??.
00000000140DBF20: 00003800 00000000 00000300 00003800 ?..8...........8.
00000000140DBF30: 00000000 00000000 00000000 10000080 ?................
00000000140DBF40: 01004700 6f007500 74007300 65007300 ?..G.o.u.t.s.e.s.
00000000140DBF50: 6b006500 79003000 2d004900 00000000 ?k.e.y.0.-.I.....
00000000140DBF60: 15000000 24240000 00100000 00000000 ?....$$..........
00000000140DBF70: 00010000 00100000 00000000 00000000 ?................
00000000140DBF80: 00000010 00008001 004b006f 00750074 ?.........K.o.u.t
00000000140DBF90: 00730065 0073006b 00650079 00690064 ?.s.e.s.k.e.y.i.d
00000000140DBFA0: 00000006 bf057c05 3705840b 390bf80a ?....?.|.7.?.9.?.
00000000140DBFB0: af0a6a0a 210ad609 8f094c09 0509c008 ?¯.j.!.? . L . à.
00000000140DBFC0: 73082a08 df079807 57071007 d1068c06 ?s.*.?...W...?.?.
00000000140DBFD0: 47060806 c7058405 43050205 bb047a04 ?G...?.?.C...?.z.
00000000140DBFE0: 3504f203 ab036a03 2903e402 a3025a02 ?5.ò.?.j.).?.?.Z.
00000000140DBFF0: de154912 b40e1f0b 8a077319 f5036000 ?T.I.'...?.s.?.`.
OFFSET TABLE:
Row - Offset
7 (0x7) - 5598 (0x15de)
6 (0x6) - 4681 (0x1249)
5 (0x5) - 3764 (0xeb4)
4 (0x4) - 2847 (0xb1f)
3 (0x3) - 1930 (0x78a)
2 (0x2) - 6515 (0x1973)
1 (0x1) - 1013 (0x3f5)
0 (0x0) - 96 (0x60)
DBCC execution completed. If DBCC printed error messages, contact your system administrator.
so SQL Server did a huge work for the insert operation, it re-organize the page, then insert the data.
10) last time we inserted a same length row, what happen if I insert a small row? does the page re-organize happen again? let's test it
you can find the deleted row is not overwrote, there is no page re-organize, the new row is just inserted at the tail of the existing Data. that's because there is still enough free space at the page tail, while last time the free space at the page tail is not enough to save the new row, so the page need to be re-organized.
1. When delete row, the row is just marked a ghost row or delete row with flag. then ghost clean up thread will remove the ghost row by updating the offset table.
2. when insert row.
i) if there is enough free space from the end of last row to beginning of the offset table, insert it direct after the last row.
ii) or else, re-organize the page, then insert the new row after the last row.
b) if there is no enough free space in the page, then create a new page, move half data to the new page, then insert the new row in the old page.
http://www.sqlskills.com/blogs/paul/post/inside-the-storage-engine-ghost-cleanup-in-depth.aspx