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I have a table with a clustered index, which shows ~70% fragmentation on a SQL Server 2008 database. I'm trying to rebuild this index:

ALTER INDEX PK_Table1Index ON Table1 REBUILD

The statement returns immediately with success, however the fragmentation is not changing. If I review the fragmentation in the SSMS, it remains the same.

I'm suspicious that it returns immediately, so it seems as if it's not doing anything. Since a clustered index determines the table layout on disk, I'd assume that this would have to be an offline task?

I guess I'm missing something and was hoping somebody could shed some light.

  • How big is the table? – gbn Sep 16 '11 at 15:14
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How big is the table?

A small table that is only a few pages/extents rows will always show high fragmentation

  • This particular table is 199 rows. Data space: 0.023Mb, Index space: 0.016Mb. So yes, it's pretty small. So you are saying there is no way to improve that, and it doesn't matter? – Lucky Luke Sep 16 '11 at 15:52
  • It doesn't matter. This 5 8k database pages and fragmentation is measured over extents (simply) which is 8 x8 8k pages. Normally these tables should be filtered out. See dba.stackexchange.com/q/5365/630 – gbn Sep 16 '11 at 16:22
  • Thanks, this makes sense now. For some reason I thought that the tables were larger, but so far they are all small. – Lucky Luke Sep 17 '11 at 4:04

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