Internal Architecture of MDF file

--I just created a new datbase. Added one row to the table and an index.
--Looking at the mdf file using a hex editor surprised me.
create database mydb1
go
use mydb1
go
create table table1 (a char(10), b char(10))
go
insert into table1 values ('firstTest','23571113') --primes 2-13 if you care.
--Stop here..Shut down sql and view the mdf file with a hex editor (hackman)
--Search for string 23571113. You will find one (1). Only one.
--Start sql
use mydb1
go
create index idx1 on table1(b)
--Stop here..Shut down sql and view the mdf file with a hex editor (hackman)
--Search for string 23571113. You will find THREE (3). Why?
--Serious replies only please.
/Bob
Bob,
You don't need a hex editor; you use use DBCC PAGE to view the page
structures without going to all of this trouble. Syntax here:
http://www.sql-server-performance.co...ented_dbcc.asp
If you're really interested in this stuff, you should get a copy of Kalen
Delaney's _Inside SQL Server 2000_, which describes the structures in great
detail.
"Bob" <utefan001@.gmail.com> wrote in message
news:40692455.0409281803.4ce67381@.posting.google.c om...
> --I just created a new datbase. Added one row to the table and an index.
> --Looking at the mdf file using a hex editor surprised me.
> create database mydb1
> go
> use mydb1
> go
> create table table1 (a char(10), b char(10))
> go
> insert into table1 values ('firstTest','23571113') --primes 2-13 if you
care.
> --Stop here..Shut down sql and view the mdf file with a hex editor
(hackman)
> --Search for string 23571113. You will find one (1). Only one.
> --Start sql
> use mydb1
> go
> create index idx1 on table1(b)
> --Stop here..Shut down sql and view the mdf file with a hex editor
(hackman)
> --Search for string 23571113. You will find THREE (3). Why?
> --Serious replies only please.
> /Bob
|||See
http://www.nigelrivett.net/PageStructure.html
"Bob" wrote:

> --I just created a new datbase. Added one row to the table and an index.
> --Looking at the mdf file using a hex editor surprised me.
> create database mydb1
> go
> use mydb1
> go
> create table table1 (a char(10), b char(10))
> go
> insert into table1 values ('firstTest','23571113') --primes 2-13 if you care.
> --Stop here..Shut down sql and view the mdf file with a hex editor (hackman)
> --Search for string 23571113. You will find one (1). Only one.
> --Start sql
> use mydb1
> go
> create index idx1 on table1(b)
> --Stop here..Shut down sql and view the mdf file with a hex editor (hackman)
> --Search for string 23571113. You will find THREE (3). Why?
> --Serious replies only please.
> /Bob
>
|||Maybe its got to do with additional pointers in the index ?
Dylan
"Adam Machanic" <amachanic@.hotmail._removetoemail_.com> wrote in message
news:#kbGikcpEHA.1668@.TK2MSFTNGP14.phx.gbl...
> Bob,
> You don't need a hex editor; you use use DBCC PAGE to view the page
> structures without going to all of this trouble. Syntax here:
>
http://www.sql-server-performance.co...ented_dbcc.asp
> If you're really interested in this stuff, you should get a copy of Kalen
> Delaney's _Inside SQL Server 2000_, which describes the structures in
great
> detail.
>
> "Bob" <utefan001@.gmail.com> wrote in message
> news:40692455.0409281803.4ce67381@.posting.google.c om...
> care.
> (hackman)
> (hackman)
>