Using the ResUsageSAWT table to Monitor AMP Worker Tasks - comment by carrie
Vasudev, The flowcontrolled field is a snapshot of the state of the AMP (either it is in flow control, or not) at the end of the logging period. It does not tell you if the AMP was in flow control...
View ArticleUsing the ResUsageSAWT table to Monitor AMP Worker Tasks - comment by vasudev
Thank you very MUch Carrie. Got Clarified now.....
View ArticleIntrepreting DBQL DelayTime in Teradata 13.10 - comment by barryhull
Thanks Carrie. I've never had a problem with the "small window" that occurs without the delay queue. I think that the best thing to do is to either drop or rename the old table rather than delete all...
View ArticleIntrepreting DBQL DelayTime in Teradata 13.10 - comment by carrie
I agree! Good hearing from you Barry. Keep in touch. Thanks, -Carrie
View ArticleConverting CPU Seconds, Old Node Type to New Node Type - comment by...
Hi all, recently we had a hardware upgrade on our system. Our CPU have increased from 16 to 24 and our AMPS are not 920 from 768. But I have noticed that the AVG AMPCPUTIME has now increased. I have...
View ArticleControlling the Flow of Work in Teradata - comment by shekhar.sumeet
Hi Carrie Just curious to know, if the message queue lenght differ from site to site. if yes, then what is the recommended limit for the message queue and how does the queue length affects the...
View ArticleConverting CPU Seconds, Old Node Type to New Node Type - comment by carrie
If your average CPU time has increased after an upgrade there are several factors that could be responsible for this: - While you may have more CPUs per node after the upgrade, it is possible that...
View ArticleUtility Session Management - It's Inside the Database in Teradata 13.10!...
Hi, I am using TD 12. An application is firing 60 concurrent queries. Our SLA is 10 seconds for a query but its taking 20 secs to execute a query. If we increase the number of sessions for a query can...
View ArticleControlling the Flow of Work in Teradata - comment by carrie
Sumeet, Work message queue length is not considered a tunable. The queue length may be different from one configuration to another and one site to another. That difference is based on the number of...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by Rbar
For multi-column statistics, the order is still determined by the order in which they appear in the table, correct? This is a very helpful blog.
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by...
Hi Carrie, I want to clarify my doubts. If I have tables with a) UPI b) NUPI c) USI d) NUSI. What types of stats are recommended best for each based on these USING options ? Thanks and regards, Raja
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by carrie
Raja, There is a blog posting that lists the recommendations for collecting statistics. It makes these recommendations for indexed columns: Collect Full Statistics - Non-indexed columns used in...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by...
Hi Carrie, Thanks a lot for the information. I always tell people " Keep statistics fresh always" even if I have equality predicates of UPIs or USIs. I hope I make a 100% correct statement. Please let...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by carrie
Raja, Fresh statistics are always the best. But extrapolation capabilities, particularly in releases 14.0 and above, can provide some relief for sites that simply do not have the time or the...
View ArticleAutomatic Throttles in Teradata 14.0 and 14.10 - comment by vasudev
Hi Carrie, I am having a basic doubt. While considering the difference between filters and Throttles, Filters can be used only to restrict the queries at object level and resource level. But in the...
View ArticleAutomatic Throttles in Teradata 14.0 and 14.10 - comment by carrie
Vasudev, Your understanding is correct. Please re-read the response I made to you last week, as I think that suggests a reasonable direction for you to take going forward. Best regards, -Carrie...
View ArticleStatistics collection recommendations – Teradata 14.0 - comment by carrie
Chetan, I am so sorry, but I must have missed answering this question at the time it was posted. The asterisk under column names is indeed new in 14.0 and represents the number of rows in the table....
View ArticleAutomatic Throttles in Teradata 14.0 and 14.10 - comment by vasudev
Thank you very much for your Response. Thanks, Vasudev
View ArticleAre AMP Worker Tasks used by FastExport in Response Mode? - comment by Samyyy
Thank You Carrie for the important piece of information. I have always been concerned about sessions stuck in long responding state . Based on the statement :"In addition, the CPU for returning rows to...
View ArticleEasing Into Using the New AutoStats Feature - blog entry by carrie
Everyone with a Teradata Database collects statistics. No way around it. Good query plans rely on it, and we’ve all gotten used to it.But starting in Teradata Database 14.10 there’s some big changes....
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