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Page Compression


Page Compression

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Steve Jones
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Comments posted to this topic are about the item Page Compression

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Koen Verbeeck
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Great question, with subtle differences between the answers :-)


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Koen Verbeeck (6/12/2011)
Great question, with subtle differences between the answers :-)


I agree with you, it is a little tough to get this answer right Smile

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Good question, with some really plausible wrong answers.

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I thought I had the correct answer, but the subtlety of the question caught me out.
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Excellent question.



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Good question.

But one major niggle and one minor niggle:

Major niggle: if page compression is enabled on a table already containing data, each page is rebuilt and evaluated for page compression; page compression can occur here (unless I've got it wrong) and may make the data fit into fewer pages than if only row compression occurred. So the answer always applies to pages which are empty/unallocated when compression is enabled, but not always to pages which already contain data when compression is enabled.

Minor niggle: page compression won't occur even when a new row doesn't fit if the engine determines that page compression would not free up a significant amount of space.

edit: SCTEs

Tom

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This question is little tricky i.e When compression is enabled on server then only
page compression can occur .if page compression is not enabled and if page is full and a new row is added then compression may not worked .
Steve Jones
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Tom.Thomson (6/13/2011)
Good question.

But one major niggle and one minor niggle:

Major niggle: if page compression is enabled on a table already containing data, each page is rebuilt and evaluated for page compression; page compression can occur here (unless I've got it wrong) and may make the data fit into fewer pages than if only row compression occurred. So the answer always applies to pages which are empty/unallocated when compression is enabled, but not always to pages which already contain data when compression is enabled.

Minor niggle: page compression won't occur even when a new row doesn't fit if the engine determines that page compression would not free up a significant amount of space.

edit: SCTEs


Fair points. I've added a note that this is after the initial page compression setting.

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Missed it! But learned some important detail.
Great question!

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