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


Load balanced SQL Servers overload


Load balanced SQL Servers overload

Author
Message
Tom Williamson-285801
Tom Williamson-285801
Forum Newbie
Forum Newbie (9 reputation)Forum Newbie (9 reputation)Forum Newbie (9 reputation)Forum Newbie (9 reputation)Forum Newbie (9 reputation)Forum Newbie (9 reputation)Forum Newbie (9 reputation)Forum Newbie (9 reputation)

Group: General Forum Members
Points: 9 Visits: 8
We have three load-balanced SQL Servers with a large (>100 million rows) table on each of them. The table is used only for lookups (although the database is not read-only). The code base is all legacy code, some of it quite old (SQL 7.0 or earlier, maybe).

When one of the three servers is taken offline, the other two servers immediately go to 100% CPU utilization and the number of active transactions rises from about 7-10 per server to in excess of 100-200 per server. All queries after that start timing out and our web site is effectively "down" until the situation is remedied (usually by placing the third server back into the load balancing system).

I'm at a loss with this problem. The servers are not normally CPU bound - in fact CPU usage normally is low (processing is usually I/O bound). Is it a locking issue? Lack of memory? Gremlins?

Does anyone have any ideas on what to monitor to try and isolate this issue?

Thanks in advance....
PaulB-TheOneAndOnly
PaulB-TheOneAndOnly
SSCertifiable
SSCertifiable (5.4K reputation)SSCertifiable (5.4K reputation)SSCertifiable (5.4K reputation)SSCertifiable (5.4K reputation)SSCertifiable (5.4K reputation)SSCertifiable (5.4K reputation)SSCertifiable (5.4K reputation)SSCertifiable (5.4K reputation)

Group: General Forum Members
Points: 5399 Visits: 4639
Post does not provides enough information.

What are the configurations of each one of the three servers? are these server dedicated to this "one table" database?

How are you load balancing?

Something is also off with number of transactions.

100 Million rows apiece is not that big, actually a 300 million rows table is nothing unusual in a DSS environment.

_____________________________________
Pablo (Paul) Berzukov

Author of Understanding Database Administration available at Amazon and other bookstores.

Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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