SQL Clone
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


SSD Performance & index fragmentation


SSD Performance & index fragmentation

Author
Message
Balance
Balance
Mr or Mrs. 500
Mr or Mrs. 500 (582 reputation)Mr or Mrs. 500 (582 reputation)Mr or Mrs. 500 (582 reputation)Mr or Mrs. 500 (582 reputation)Mr or Mrs. 500 (582 reputation)Mr or Mrs. 500 (582 reputation)Mr or Mrs. 500 (582 reputation)Mr or Mrs. 500 (582 reputation)

Group: General Forum Members
Points: 582 Visits: 1048
I'm not quite sure where is the best place to post this question but here goes.

My understanding is that if I were to install Windows onto an SSD drive then I would no longer want to defrag the hard disk - I was wondering if I were to start using flash storage arrays of one sort or another (I don't have a variety in mind, just a question out of interest) would index fragmentation still be an issue and need dealing with - presumably it would become an issue eventually but the rewriting activity would need to be minimised?

Does anyone know of any studies into this sort of thing with SQL Server & SSDs?

Thanks
Orlando Colamatteo
Orlando Colamatteo
SSCoach
SSCoach (15K reputation)SSCoach (15K reputation)SSCoach (15K reputation)SSCoach (15K reputation)SSCoach (15K reputation)SSCoach (15K reputation)SSCoach (15K reputation)SSCoach (15K reputation)

Group: General Forum Members
Points: 15017 Visits: 14396
Brent Ozar and Paul Randal both have posted research and findings on the topic. Google or Bing are your friend there. I just pulled back a bunch of relevant results.

__________________________________________________________________________________________________
There are no special teachers of virtue, because virtue is taught by the whole community. --Plato
GilaMonster
GilaMonster
SSC Guru
SSC Guru (87K reputation)SSC Guru (87K reputation)SSC Guru (87K reputation)SSC Guru (87K reputation)SSC Guru (87K reputation)SSC Guru (87K reputation)SSC Guru (87K reputation)SSC Guru (87K reputation)

Group: General Forum Members
Points: 87949 Visits: 45274
Fragmentation, probably not. Low page density (a side effect of fragmentation), hell yes. Having half of your expensive SSD going to waste because of low page density isn't the greatest of ideas.

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

We walk in the dark places no others will enter
We stand on the bridge and no one may pass


Balance
Balance
Mr or Mrs. 500
Mr or Mrs. 500 (582 reputation)Mr or Mrs. 500 (582 reputation)Mr or Mrs. 500 (582 reputation)Mr or Mrs. 500 (582 reputation)Mr or Mrs. 500 (582 reputation)Mr or Mrs. 500 (582 reputation)Mr or Mrs. 500 (582 reputation)Mr or Mrs. 500 (582 reputation)

Group: General Forum Members
Points: 582 Visits: 1048
Thanks
TheSQLGuru
TheSQLGuru
SSChampion
SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)

Group: General Forum Members
Points: 12561 Visits: 8558
GilaMonster (2/15/2013)
Fragmentation, probably not. Low page density (a side effect of fragmentation), hell yes. Having half of your expensive SSD going to waste because of low page density isn't the greatest of ideas.


I agree. I think Jonathan Kehayias did a blog post about that (and also about sequential IO actually being faster on SSDs too, just like on rotating media).

Best,
Kevin G. Boles
SQL Server Consultant
SQL MVP 2007-2012
TheSQLGuru on googles mail service
Nadrek
Nadrek
SSCommitted
SSCommitted (1.9K reputation)SSCommitted (1.9K reputation)SSCommitted (1.9K reputation)SSCommitted (1.9K reputation)SSCommitted (1.9K reputation)SSCommitted (1.9K reputation)SSCommitted (1.9K reputation)SSCommitted (1.9K reputation)

Group: General Forum Members
Points: 1907 Visits: 2729
Yes, SSD's (and SSD's in RAID configurations) are indeed still faster for sequential access than they are for random access (significantly, in the case of writes, slightly in the case of reads). Spinning disks are significantly faster in sequential access for both writes and reads.

Note that I've provided some SSD performance results in the
RAID and Its impact on your SQL performance
thread.

Testing techniques and how to load the output into SQL Server comes from the FusionIO thread.
Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum

































































































































































SQLServerCentral


Search