IX fragmentation and Updating Stats

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IX fragmentation and Updating Stats

sqlguy80

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November 7, 2023 at 6:32 pm

#4323241

Though its Azure MI Business critical , I see fragmentation, Any script to identify which IX's need to be rebuilt ,as Frag is over 50%.
I will add REBUILD WITH (ONLINE=ON) as we cannot have downtime , Its a 24 x 7 DB. I see failed inserts on dynatrace every now and then, possibly as the table is large in size 72 m rows ( 2019 -2023 data )

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Jeff Moden SSC Guru Points: 1003869 More actions · Answer 1

sqlguy80 wrote:

Though its Azure MI Business critical , I see fragmentation, Any script to identify which IX's need to be rebuilt ,as Frag is over 50%.
I will add REBUILD WITH (ONLINE=ON) as we cannot have downtime , Its a 24 x 7 DB. I see failed inserts on dynatrace every now and then, possibly as the table is large in size 72 m rows ( 2019 -2023 data )

Let me ask... how much of a performance improvement was there when you rebuilt that index?

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
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________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

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Johan Bijnens SSC Guru Points: 135259 More actions · Answer 2

What is actually the question ?

Why are inserts failing ? ( trace it if it's not available in the application logs )

Johan

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Michael L John One Orange Chip Points: 27038 More actions · Answer 3

sqlguy80 wrote:

Though its Azure MI Business critical , I see fragmentation, Any script to identify which IX's need to be rebuilt ,as Frag is over 50%.
I will add REBUILD WITH (ONLINE=ON) as we cannot have downtime , Its a 24 x 7 DB. I see failed inserts on dynatrace every now and then, possibly as the table is large in size 72 m rows ( 2019 -2023 data )

There is little that adds up here. The "Azure MI Business Critical" tier has nothing that limits fragmentation. Why would you expect the tier to have in it that would have an effect on index fragmentation?

What indicates to you that fragmentation over 50% is an issue and requires a rebuild?

A failing insert should not be affected by a fragmented index, unless of course a rebuild was occurring when the insert was being executed. Are there errors that go with these failures?

Michael L John
If you assassinate a DBA, would you pull a trigger?
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