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Simple Index question


Simple Index question

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waxb18
waxb18
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Good Morning All,

Just a quick question...

I have a table which updates on a daily basis after 11pm when no-one is here.

Is it good practise to have the indexes build each day or each week?

Each update adds approximately 10000 rows of data

Thanks in advance
Abu Dina
Abu Dina
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waxb18 (8/30/2013)
Good Morning All,

Just a quick question...

I have a table which updates on a daily basis after 11pm when no-one is here.

Is it good practise to have the indexes build each day or each week?

Each update adds approximately 10000 rows of data

Thanks in advance


I don't think this has much to do with best practice. It depends on your maintenance window and the size of the table. If it's going to take a few minutes to rebuild the index then just do that every night.

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Erland Sommarskog
Erland Sommarskog
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It's impossible to say. In the system I work there is a table to which a bunch of rows are added every night. This job usually completes in a few minutes. But after index rebuilds it runs for an hour.

Erland Sommarskog, SQL Server MVP, www.sommarskog.se
george sibbald
george sibbald
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hard to say on index rebuilds, check the fragmentation daily to see how quickly the indexes fragment.

You may want to update your stats after the upload though. Presuming you have auto update stats turned on for a table larger than 500 rows stats will only update automatically when (from BOL):

'The table had more than 500 rows when the statistics were gathered, and the colmodctr of the leading column of the statistics object has changed by more than 500 + 20% of the number of rows in the table when the statistics were gathered.'

If 10000 rows is not enough to trigger that your stats could be less than optimum.

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Enrico van de Laar
Enrico van de Laar
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You should keep an eye on the fragmentation of the index every day.
If you notice the fragmentation growing to high ( > 30% ) you should consider rebuilding the index every n days depending on how many days it took for the fragmentation to reach 30%.

There is no need to update statistics after you have rebuild your index, this happens with the rebuild action.
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