Defrag Script

Hi all,
I'm writing my own defrag script. I've set it up so under certain conditions
it will run an IndexDefrag and under others a Reindex. I wanted to post the
conditions I've set and see if anyone has any feedback that can improve them.
I have two temporary tables 1 contains the tables and indexes, and one the
ShowContig information.
The IndexDefrag test is:
UPDATE #TableIndexList
SET ReqAction = 'I'
FROM #TableIndexList AS a
INNER JOIN #FragStats AS b
ON a.ObjectID = b.ObjectID
WHERE b.Pages BETWEEN 16 AND 4096
AND ((b.LogicalFragmentation BETWEEN 20 AND 40)
OR b.AveragePageDensity < 75)
The reindex criteria is:
UPDATE #TableIndexList
SET ReqAction = 'R'
FROM #TableIndexList AS a
INNER JOIN #FragStats AS b
ON a.ObjectID = b.ObjectID
WHERE (b.Pages > 16
AND (b.LogicalFragmentation > 40
OR b.AveragePageDensity > 95))
OR (b.Pages > 4096
AND (b.LogicalFragmentation > 20
OR b.AveragePageDensity < 75))
As advised any feedback would be greatly appreciated...Have you compared the before and after results. Sometimes due to the way you
have constructed your table you will find residual fragmentation after
running such scripts will be almost the same.
--
Hilary Cotter
Director of Text Mining and Database Strategy
RelevantNOISE.Com - Dedicated to mining blogs for business intelligence.
This posting is my own and doesn't necessarily represent RelevantNoise's
positions, strategies or opinions.
Looking for a SQL Server replication book?
http://www.nwsu.com/0974973602.html
Looking for a FAQ on Indexing Services/SQL FTS
http://www.indexserverfaq.com
"BenUK" <BenUK@.discussions.microsoft.com> wrote in message
news:AD82F542-DD91-4973-B0C1-8DAB523A7EF8@.microsoft.com...
> Hi all,
> I'm writing my own defrag script. I've set it up so under certain
> conditions
> it will run an IndexDefrag and under others a Reindex. I wanted to post
> the
> conditions I've set and see if anyone has any feedback that can improve
> them.
> I have two temporary tables 1 contains the tables and indexes, and one the
> ShowContig information.
> The IndexDefrag test is:
> UPDATE #TableIndexList
> SET ReqAction = 'I'
> FROM #TableIndexList AS a
> INNER JOIN #FragStats AS b
> ON a.ObjectID = b.ObjectID
> WHERE b.Pages BETWEEN 16 AND 4096
> AND ((b.LogicalFragmentation BETWEEN 20 AND 40)
> OR b.AveragePageDensity < 75)
> The reindex criteria is:
> UPDATE #TableIndexList
> SET ReqAction = 'R'
> FROM #TableIndexList AS a
> INNER JOIN #FragStats AS b
> ON a.ObjectID = b.ObjectID
> WHERE (b.Pages > 16
> AND (b.LogicalFragmentation > 40
> OR b.AveragePageDensity > 95))
> OR (b.Pages > 4096
> AND (b.LogicalFragmentation > 20
> OR b.AveragePageDensity < 75))
> As advised any feedback would be greatly appreciated...|||Thats interesting.. ..I'm identifying heaps for manual defrags, I'm excluding
blobs, is it a scenario where the table is busy and the IndexDefrag is
skipping the pages?
"Hilary Cotter" wrote:
> Have you compared the before and after results. Sometimes due to the way you
> have constructed your table you will find residual fragmentation after
> running such scripts will be almost the same.
> --
> Hilary Cotter
> Director of Text Mining and Database Strategy
> RelevantNOISE.Com - Dedicated to mining blogs for business intelligence.
> This posting is my own and doesn't necessarily represent RelevantNoise's
> positions, strategies or opinions.
> Looking for a SQL Server replication book?
> http://www.nwsu.com/0974973602.html
> Looking for a FAQ on Indexing Services/SQL FTS
> http://www.indexserverfaq.com
>
> "BenUK" <BenUK@.discussions.microsoft.com> wrote in message
> news:AD82F542-DD91-4973-B0C1-8DAB523A7EF8@.microsoft.com...
> > Hi all,
> >
> > I'm writing my own defrag script. I've set it up so under certain
> > conditions
> > it will run an IndexDefrag and under others a Reindex. I wanted to post
> > the
> > conditions I've set and see if anyone has any feedback that can improve
> > them.
> > I have two temporary tables 1 contains the tables and indexes, and one the
> > ShowContig information.
> >
> > The IndexDefrag test is:
> > UPDATE #TableIndexList
> > SET ReqAction = 'I'
> > FROM #TableIndexList AS a
> > INNER JOIN #FragStats AS b
> > ON a.ObjectID = b.ObjectID
> > WHERE b.Pages BETWEEN 16 AND 4096
> > AND ((b.LogicalFragmentation BETWEEN 20 AND 40)
> > OR b.AveragePageDensity < 75)
> >
> > The reindex criteria is:
> > UPDATE #TableIndexList
> > SET ReqAction = 'R'
> > FROM #TableIndexList AS a
> > INNER JOIN #FragStats AS b
> > ON a.ObjectID = b.ObjectID
> > WHERE (b.Pages > 16
> > AND (b.LogicalFragmentation > 40
> > OR b.AveragePageDensity > 95))
> > OR (b.Pages > 4096
> > AND (b.LogicalFragmentation > 20
> > OR b.AveragePageDensity < 75))
> >
> > As advised any feedback would be greatly appreciated...
>
>|||or maybe when there's not enough disk space to run DBCC Reindex on a large
table
"Hilary Cotter" wrote:
> Have you compared the before and after results. Sometimes due to the way you
> have constructed your table you will find residual fragmentation after
> running such scripts will be almost the same.
> --
> Hilary Cotter
> Director of Text Mining and Database Strategy
> RelevantNOISE.Com - Dedicated to mining blogs for business intelligence.
> This posting is my own and doesn't necessarily represent RelevantNoise's
> positions, strategies or opinions.
> Looking for a SQL Server replication book?
> http://www.nwsu.com/0974973602.html
> Looking for a FAQ on Indexing Services/SQL FTS
> http://www.indexserverfaq.com
>
> "BenUK" <BenUK@.discussions.microsoft.com> wrote in message
> news:AD82F542-DD91-4973-B0C1-8DAB523A7EF8@.microsoft.com...
> > Hi all,
> >
> > I'm writing my own defrag script. I've set it up so under certain
> > conditions
> > it will run an IndexDefrag and under others a Reindex. I wanted to post
> > the
> > conditions I've set and see if anyone has any feedback that can improve
> > them.
> > I have two temporary tables 1 contains the tables and indexes, and one the
> > ShowContig information.
> >
> > The IndexDefrag test is:
> > UPDATE #TableIndexList
> > SET ReqAction = 'I'
> > FROM #TableIndexList AS a
> > INNER JOIN #FragStats AS b
> > ON a.ObjectID = b.ObjectID
> > WHERE b.Pages BETWEEN 16 AND 4096
> > AND ((b.LogicalFragmentation BETWEEN 20 AND 40)
> > OR b.AveragePageDensity < 75)
> >
> > The reindex criteria is:
> > UPDATE #TableIndexList
> > SET ReqAction = 'R'
> > FROM #TableIndexList AS a
> > INNER JOIN #FragStats AS b
> > ON a.ObjectID = b.ObjectID
> > WHERE (b.Pages > 16
> > AND (b.LogicalFragmentation > 40
> > OR b.AveragePageDensity > 95))
> > OR (b.Pages > 4096
> > AND (b.LogicalFragmentation > 20
> > OR b.AveragePageDensity < 75))
> >
> > As advised any feedback would be greatly appreciated...
>
>