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Too Much Unused Space A Performance Issue?


Too Much Unused Space A Performance Issue?

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Jon.Morisi
Jon.Morisi
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Hi let me first say I know shrinking a Database is bad for fragmentation.

What I want to know is with a very large database, does it cause a performance issue to have a lot of unused space. I'm talking about a 1.8 TB database with 475 GB of unused space.

I ask this not because I want to shrink it, but because I want to avoid the manual file growth requirement (not set by me) to grow the data file when there is less than 20% free space.

I'd prefer to configure auto growth at 8GB and let it roll which got me thinking about, "how does the amount of free space within a data file relate to performance"?

Thanks!
TheSQLGuru
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The only thing I can think of that might be a performance effect of this is having data be physically "far apart" on disks, leading to a few extra milliseconds of access/seek time. But as long as you aren't serving this up on 4 disks or something I think that would be a minimal effect.

Best,
Kevin G. Boles
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SQL MVP 2007-2012
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GilaMonster
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Jon.Morisi (9/6/2013)
Does it cause a performance issue to have a lot of unused space.


No.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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