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


Identifying what caused Corruption


Identifying what caused Corruption

Author
Message
GilaMonster
GilaMonster
SSC Guru
SSC Guru (86K reputation)SSC Guru (86K reputation)SSC Guru (86K reputation)SSC Guru (86K reputation)SSC Guru (86K reputation)SSC Guru (86K reputation)SSC Guru (86K reputation)SSC Guru (86K reputation)

Group: General Forum Members
Points: 86657 Visits: 45254
TheSQLGuru (5/7/2014)
Also note that you stated that 9,999 times out of 10,000 that the IO subsystem was responsible for corruptions. Same type of probabilistic statement - just with a higher level of certainty. Cool


Well that's from Paul, who has a hell of a lot more experience and knowledge in this area, and was based on his time with the dev team and corruptions he's worked on since. I'll take his probabilistic statement as fact. I certainly have no grounds to disagree with his statement.

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


winston Smith
winston Smith
SSCommitted
SSCommitted (1.8K reputation)SSCommitted (1.8K reputation)SSCommitted (1.8K reputation)SSCommitted (1.8K reputation)SSCommitted (1.8K reputation)SSCommitted (1.8K reputation)SSCommitted (1.8K reputation)SSCommitted (1.8K reputation)

Group: General Forum Members
Points: 1767 Visits: 2064
Update:

There was windows patching of the VM occurring at the time of the issue. The Virtual Disk Service was flickering between stopped and started. I "guess" this could cause an issue if it was flicking between started and stopped when sql was trying to write to the tran log on a LUN controlled by the Virtual Disk Service.

Scans of the disks within the VM VHD's and physical storage have shown no issues. No corruption since the issue also.

Im inclined to think patching caused this issue, but am still looking for hard evidence.
Perry Whittle
Perry Whittle
SSCoach
SSCoach (19K reputation)SSCoach (19K reputation)SSCoach (19K reputation)SSCoach (19K reputation)SSCoach (19K reputation)SSCoach (19K reputation)SSCoach (19K reputation)SSCoach (19K reputation)

Group: General Forum Members
Points: 19794 Visits: 17242
Ah so its a virtual machine, this wasnt made known before. Are these virtual hard disks or raw device mappings?

-----------------------------------------------------------------------------------------------------------

"Ya can't make an omelette without breaking just a few eggs" ;-)
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