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Too Much Unused Space A Performance Issue? Expand / Collapse
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Posted Friday, September 6, 2013 6:33 PM


Old Hand

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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!
Post #1492462
Posted Friday, September 6, 2013 9:40 PM


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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
SQL Server Consultant
SQL MVP 2007-2012
TheSQLGuru at GMail
Post #1492470
Posted Saturday, September 7, 2013 12:03 AM


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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
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Post #1492475
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