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Re: Are rowids always in increasing order?

Posted By: Rajib Sarkar
Date: Thursday, 22 April 2004, at 8:34 p.m.

In Response To: Are rowids always in increasing order? (Jean Sagi)

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Rowid is of the format 0xLLLLLLSS where L =3D logical page offset withi=
n
tablespace and S =3D slot# within page.

When the engine starts allocating pages for the table, usually its
contiguous and with increasing offset into the table ..but there maybe =
a
situation in a table where say there are 5000 pages already allocated f=
or
the table and there are some holes in the pages i.e. all of the pages a=
re
not full with rows and potentially more rows can be fitted into the pag=
es
..then it maybe that a new row is put in page offset 2000 ..then the RO=
WID
will be less than the row residing on page 5000.

U hv to visualize ROWID as a physical representation of a row ..when a =
user
asks the engine to get a particular row ..it can get the ROWID (from th=
e
index) and immediately go into the page without doing any further
calculation ...so yes, its right that the ROWID is unique for the lifet=
ime
of the row IN THE PAGE. In an IN PLACE ALTER situation, when u update t=
he
row it may be relocated to another page and a new rowid is representing=
the
row now. ROWID is no internal integer which the engine increments every=

time a row is inserted ..ROWID is the means for the engine to reach the=
row
in the quickest possible way ...

HTH

Thanx much,

Rajib Sarkar
Advisory Software Engineer (RAS)
IBM Data Management Group

If we all did the things we are capable of doing, we would literally
astound ourselves. -- T. Edison

=

"Jean Sagi" =

<jeansagi@myrealb =

ox.com> =
To
Sent by: ids@iiug.org =

forum.subscriber@ =
cc
iiug.org =

Subj=
ect
Are rowids always in increasing =

04/22/2004 04:13 order? [2867] =

PM =

=

=

=

=

=

Hi,

I wonder if anyone one knows if IDS (9.3) asigns rowids in increasing
order?

I mean Always.

In the documentation it i stated that:

"The database server assigns to each row in the rowid column a unique
number that remains stable for the life of the row."

But I haven't found any indication that the numbers asigned to the rowd=
is
are always choosed in increasing order.

If anyone know, let me know . I'll appreciate it a lot.

Chucho!

Jean Sagi
jeansagi@myrealbox.com
jeansagi@netscape.net

=

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<html><body>
Rowid is of the format 0xLLLLLLSS where L =3D logical page offset wi=
thin tablespace and S =3D slot# within page. 
 
When the engine starts allocating pages for the table, usually its cont=
iguous and with increasing offset into the table ..but there maybe a si=
tuation in a table where say there are 5000 pages already allocated for=
the table and there are some holes in the pages i.e. all of the pages =
are not full with rows and potentially more rows can be fitted into the=
pages ..then it maybe that a new row is put in page offset 2000 ..then=
the ROWID will be less than the row residing on page 5000. 
 
U hv to visualize ROWID as a physical representation of a row ..when a =
user asks the engine to get a particular row ..it can get the ROWID (fr=
om the index) and immediately go into the page without doing any furthe=
r calculation ...so yes, its right that the ROWID is unique for the lif=
etime of the row IN THE PAGE. In an IN PLACE ALTER situation, wh=
en u update the row it may be relocated to another page and a new rowid=
is representing the row now. ROWID is no internal integer which the en=
gine increments every time a row is inserted ..ROWID is the means for t=
he engine to reach the row in the quickest possible way ... 
 
HTH 
 
Thanx much, 
 
Rajib Sarkar 
Advisory Software Engineer (RAS) 
IBM Data Management Group 
 
 
If we all did the things we are capable of doing, we would literally as=
tound ourselves. -- T. Edison 
 
<img src=3D"cid:10__=3D88BBE4ECDF91A3BE8f9e8a93df938@us.ibm.com" width=3D=
"16" height=3D"16" alt=3D"Inactive hide details for "Jean Sagi&quo=
t; <jeansagi@myrealbox.com>">"Jean Sagi" <jeansagi@m=
yrealbox.com> 
 
 

<table width=3D"100%" border=3D"0" cellspacing=3D"0" cellpadding=3D"0">=

<tr valign=3D"top"><td style=3D"background-image:url(cid:20__=3D88BBE4E=
CDF91A3BE8f9e8a93df938@us.ibm.com); background-repeat: no-repeat; " wid=
th=3D"40%">
<ul>
<ul>
<ul>
<ul>"Jean Sagi" <jeansagi@myrealbox.co=
m> 
Sent by: forum.subscriber@iiug.org
04/22/2004 04:13 PM</ul>
</ul>
</ul>
</ul>
</td><td width=3D"60%">
<table width=3D"100%" border=3D"0" cellspacing=3D"0" cellpadding=3D"0">=

<tr valign=3D"top"><td width=3D"1%" valign=3D"middle"><img src=3D"cid:3=
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1" width=3D"58" alt=3D""> 
<div align=3D"right">To</div></td><td width=3D"=
100%"><img src=3D"cid:30__=3D88BBE4ECDF91A3BE8f9e8a93df938@us.ibm.com" =
border=3D"0" height=3D"1" width=3D"1" alt=3D""> 
ids@iiug.org</td></tr>

<tr valign=3D"top"><td width=3D"1%" valign=3D"middle"><img src=3D"cid:3=
0__=3D88BBE4ECDF91A3BE8f9e8a93df938@us.ibm.com" border=3D"0" height=3D"=
1" width=3D"58" alt=3D""> 
<div align=3D"right">cc</div></td><td width=3D"=
100%"><img src=3D"cid:30__=3D88BBE4ECDF91A3BE8f9e8a93df938@us.ibm.com" =
border=3D"0" height=3D"1" width=3D"1" alt=3D""> 
</td></tr>

<tr valign=3D"top"><td width=3D"1%" valign=3D"middle"><img src=3D"cid:3=
0__=3D88BBE4ECDF91A3BE8f9e8a93df938@us.ibm.com" border=3D"0" height=3D"=
1" width=3D"58" alt=3D""> 
<div align=3D"right">Subject</div></td><td widt=
h=3D"100%"><img src=3D"cid:30__=3D88BBE4ECDF91A3BE8f9e8a93df938@us.ibm.=
com" border=3D"0" height=3D"1" width=3D"1" alt=3D""> 
Are rowids always in increasing order? [2867]</=
td></tr>
</table>

<table border=3D"0" cellspacing=3D"0" cellpadding=3D"0">
<tr valign=3D"top"><td width=3D"58"><img src=3D"cid:30__=3D88BBE4ECDF91=
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/td></tr>
</table>
</td></tr>
</table>
 
<tt>Hi, 
 
I wonder if anyone one knows if IDS (9.3) asigns rowids in increasing o=
rder? 
 
I mean Always. 
 
In the documentation it i stated that: 
 
"The database server assigns to each row in the rowid column a uni=
que number that remains stable for the life of the row." 
 
But I haven't found any indication that the numbers asigned to the rowd=
is are always choosed in increasing order. 
 
If anyone know, let me know . I'll appreciate it a lot. 
 
 
Chucho! 
 
 
 
Jean Sagi 
jeansagi@myrealbox.com 
jeansagi@netscape.net 
 
 
 
</tt> 
</body></html>=

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Messages In This Thread

Are rowids always in increasing order?
Jean Sagi -- Thursday, 22 April 2004, at 7:13 p.m.
- Re: Are rowids always in increasing order?
  Rajib Sarkar -- Thursday, 22 April 2004, at 8:34 p.m.
  - RE: Are rowids always in increasing order?
    NormaJean.Sebastian@tellabs.com -- Thursday, 22 April 2004, at 10:44 p.m.
  - RE: Are rowids always in increasing order?
    Rajib Sarkar -- Friday, 23 April 2004, at 11:13 a.m.
- Re: Are rowids always in increasing order?
  Madison Pruet -- Thursday, 22 April 2004, at 9:45 p.m.
- Re: Are rowids always in increasing order?
  vze2qjg5@verizon.net -- Friday, 23 April 2004, at 11:53 a.m.

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