Workload Management with User Defined Functions and Table Operators - comment...
Geeta, There are many different delay queues in the database. When you say "delayed sessions in the delay queue" that you say you can see in Viewpoint, I believe you are speaking about the throttle...
View ArticleStatistics collection recommendations – Teradata 14.0 - comment by carrie
Chetan, The first line that you see in the HELP STATS output in 14.0 represents the table row count in the UniqueValues column. That is why it has an asterisk for the Column Names column. It is not...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by carrie
Srini, My apologies, but I did not get notified of your comment. The asterisk in the first line of the HELP STATS output represents the row count of the table. It comes from the SUMMARY statistics...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by...
Ciao Carrie, I have a very simple and quick question regarding STATS and CURRENT STATS. I create a table T and define some stats without insert any rows. If I run HELP STATS ON T I get the right...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by carrie
Hi Pietro, Even when a table has no rows at the time you collect stats, the optimizer will always adjust that up to one row before it attempts to build the query plan. The cost calculations used by...
View ArticleExpediting Express Requests - comment by danR
Hi Carrie: Our company is starting the migration from 13.10 to 14.10. With the new 14.0 features, including 'columnar' partitioning, ..., what should we look out for as possible 'hickup's - in the...
View ArticleExpediting Express Requests - comment by carrie
Dan, That's a question that is better addressed to your Teradata account team. Or you might want to ask that question on one of the Teradata Q&A forums and get feedback from others who have been...
View ArticleWorkload Management with User Defined Functions and Table Operators - comment...
As always my question is perfectly answered, thank you very much for detailed explanation. And sorry, i would have clearly mentioned about thorrle delay queue. It good to know that the throttle delay...
View ArticleWorkload Management with User Defined Functions and Table Operators - comment...
Geeta, FlowControlled: This metric tells you if the AMP is in flow control at this point in time. It is a snapshot taken at the end of the logging interval. If it is zero, it indicates the AMP was...
View ArticleWorkload Management with User Defined Functions and Table Operators - comment...
Thank you for the clarification before and after Veriosn 14 for FlowControl analysis. And in terms of setting up an alert on flowcontrol in Viewpoint, as far as I knnow, there is no alert type...
View ArticleWorkload Management with User Defined Functions and Table Operators - comment...
Geeta, The flow control event in 13.10 is not a very reliable way to assess the frequency or even the presence of flow control on the AMPs. That is because it does not use the flow control time...
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Statistics Collection Recommendations – Teradata Database 14.10 - blog entry...
Cover Image: Statistical information is vital for the optimizer when it builds query plans. But collecting statistics can involve time and resources. By understanding and combining several different...
View ArticleWorkload Management with User Defined Functions and Table Operators - comment...
Good to know the event is not so realiable. Just cuirous to know, was there any bug OR limitation with 13.10 for that specific event in DBMS/Viewpoint?
View ArticleStatistics Collection Recommendations – Teradata Database 14.10 - comment by...
Dear Carrie We are in the phase to enable THRESHOLDS for our Stats Collection process. The big question is now with which SYSTEM Thresholds we should start. Are there any good practise values available...
View ArticleStatistics Collection Recommendations – Teradata Database 14.10 - comment by...
Armin, If you haven't seen it, take a look at my blog posting Statistics Threshold Functionality 101. That may provide a little more understanding about how to use threshold. In general, the...
View ArticleRecommended Dictionary Statistics to Collect in Teradata 14.0 - comment by...
Hello Carrie, I wonder collecting stats on ObjectId column on StatsTbl would make sense...It seem other collect stats statement you listed above covers the PI on each table, but the StatsTbl.ObjectId...
View ArticleRecommended Dictionary Statistics to Collect in Teradata 14.0 - comment by...
Hi Jessie, You do not need to collect statistics on any of the StatsTbl columns unless you have users who are accessing StatsTbl as one of the participating tables in a mult-itable query, and where...
View ArticleUsing the ResUsageSAWT table to Monitor AMP Worker Tasks - comment by vasudev
Hi Carrie, We are using TD12. During morning time response time for the queires are missing the SLA's. We had noted that AMP's are flow controlled. We had reserved 2 AWT's per amp. If we free that 2...
View ArticleStatistics Collection Recommendations – Teradata Database 14.10 - comment by...
I am not sure who I should send this to so you are it. I work at AAA in Calif and I work on the mainframe and also with Teradata tables. I have to create interactive screens on the mainframe using a...
View ArticleUsing the ResUsageSAWT table to Monitor AMP Worker Tasks - comment by carrie
Vasudev, Whether or not you want to remove the reserve count of 2 depends on how those reserves are being used. If they are not being used ever by any work, then it makes sense to remove them and put...
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