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


Performance troubleshooting


Performance troubleshooting

Author
Message
sqlfriends
sqlfriends
SSChampion
SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)

Group: General Forum Members
Points: 10211 Visits: 4195
We have a department who has a couple of SQL servers,they said there sometimes maybe disk I/O issues. That is all information I got from them. They would like me to help troubleshooting.
How can I help them to identify the problem using SQL server native tools.
I login to the server and found it has 24 GB memory and max memory set to 20 GB.
What information I need from them to start troubleshooting?
Currently it runs fine.


PS: I know I can use PM, DMV, or any other recommendations to start with?
I think I have to set up real time monitor, otherwise it will collect too many data to save somewhere, or shall I first ask them when the slowness usually happen to monitor a certain time period?

Thanks,
SQL Show
SQL Show
UDP Broadcaster
UDP Broadcaster (1.5K reputation)UDP Broadcaster (1.5K reputation)UDP Broadcaster (1.5K reputation)UDP Broadcaster (1.5K reputation)UDP Broadcaster (1.5K reputation)UDP Broadcaster (1.5K reputation)UDP Broadcaster (1.5K reputation)UDP Broadcaster (1.5K reputation)

Group: General Forum Members
Points: 1487 Visits: 1078
Disk IO? How they confirm this. Do they have any IO related error in event log ? .

select * from sys.dm_io_virtual_file_stats (Null,null)
Run the query to see any IO stalls (IO_stalls_read_ms and IO_stalls_write_ms) are
there (considerable IO stall for considerable duration)

You may run Performance Monitor.exe to find disk IO metrics.See for "Disk Queue Length".
Grant Fritchey
Grant Fritchey
SSC Guru
SSC Guru (97K reputation)SSC Guru (97K reputation)SSC Guru (97K reputation)SSC Guru (97K reputation)SSC Guru (97K reputation)SSC Guru (97K reputation)SSC Guru (97K reputation)SSC Guru (97K reputation)

Group: General Forum Members
Points: 97245 Visits: 33013
Also look at sys.dm_os_wait_stats. That's going to tell you specifically what is causing things to slow down on the server. It won't narrow it down to particular processes or anything, but you'll know if it's I/O, memory, CPU or whatever.

----------------------------------------------------
The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood...
Theodore Roosevelt

The Scary DBA
Author of: SQL Server Query Performance Tuning and SQL Server Execution Plans
Product Evangelist for Red Gate Software
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