New opportunities for statistics collection in Teradata 14.0 - comment by Samyyy
@Barani_Sachin : I have come across this error ...this happens when you conurrently try to define stats on same table ... Not related to stored proc ... To confirm , Just try keeping one collect stats...
View ArticleElevating Parsing Priority - comment by rtefft
Carrie, Would this approach be useful for speeding up execution of complex stored procedures? We have a handful that have many small queries in loops (ugh I know, but unavoidable). The amount of data...
View ArticleUsing the ResUsageSAWT table to Monitor AMP Worker Tasks - comment by Duri83
Hi Carrie, I'd like to add my thoughts on the magical value 62. Please correct me if I am wrong, but I suppose WorkNew+Work01+Available would sum up to 62 only if you do not reserve any AWT for the...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by...
@samyyy : I have 10 volatle tables, so i have to define and collect stats only in runtime. And also i am not trying to concurrently define stats on the same table. having only one statement per VT.
View ArticleUsing the ResUsageSAWT table to Monitor AMP Worker Tasks - comment by carrie
Yuri, Your comments make sense to me. Thanks, -Carrie
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by carrie
Response to Samyyy's three questions from 3 days ago: #1: I am not sure I am understanding what you are saying when you say: "I have tried defining stats using new syntax and every time it has used...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by carrie
I am not familiar with the error mentioned above. If you are still not sure what is happening, consider opening an incident with the support center. Thanks, -Carrie
View ArticleStatistics collection recommendations – Teradata 14.0 - comment by carrie
Hi Rich, Once you have defined all the stats on a table separately, you can recollect at the table level with one SQL command. This will re-collect everything already defined against the table. In...
View ArticleUtility Throttles – You Won’t Regret It! - comment by trustngs
Hi Carrie, I am using TD12 and queries are taking longer to run than normal. Which teradata tool can be used to identify the no of active throttles? From some blog i came to know using TDWM we can...
View ArticleElevating Parsing Priority - comment by carrie
Rich, Good question! Yes, the stored procedure code itself will run under session classification, the same as parsing. If you look at the DBQL row for the SP call, you will not see the workload...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by Samyyy
Thank You Carrie .... That was really helpful . #3 was a beautiful explanation :) For #2 , The volatile table is getting joined to itself .. so there are no other tables involved .What amazes me is the...
View ArticleUtility Throttles – You Won’t Regret It! - comment by carrie
For utility throttles you can go to the Viewpoint Query Monitor portlet. Under Select Report, choose By Utility and you get a list of active utility throttles and their limits. For workload...
View ArticleEntering and Exiting a TASM State - blog entry by carrie
In earlier postings I’ve described how TASM system events can detect such things as AMP worker task shortages, and automatically react to change workload managements settings. These system events...
View ArticleUtility Throttles – You Won’t Regret It! - comment by trustngs
Hi Carrie, Thank you very Much.
View ArticleElevating Parsing Priority - comment by Roopalini
Hi Carrie, Thanks for the wonderful article. Could you let me know, if there are any reasons for EXPLAIN to run for long time? One of the users on the box is trying to optimize his query and when he...
View ArticleStatistics collection recommendations – Teradata 14.0 - comment by astocks
I tried issuing the following to find uniqueness, but I don't see anything in the explain plan that provides this info. Am I missing something? To determine what the uniqueness of a NUPI is before...
View ArticleElevating Parsing Priority - comment by carrie
There are many things that can impact parsing elapsed time. Some of them include: - a very complex plan has to be constructed - the optimization processing is running at a low priority - the system...
View ArticleStatistics collection recommendations – Teradata 14.0 - comment by carrie
I'm not sure why your explain text doesn't give you estimated rows, but when I tried your SQL it worked for me. Make sure you have collected stats on that column. EXPLAIN SELECT DISTINCT l_orderkey...
View ArticleEliminating Unplanned Delays Within Load Utility Jobs - comment by trustngs
Hi Carrie,I am using teradata 12. Specifications are like this: Utility throttle for number of combined FastLoad and MultiLoad utilities to a maximum of 2 and delays utilities that exceed the throttle...
View ArticleStatistics collection recommendations – Teradata 14.0 - comment by trustngs
Hi Carrie, In Teradata 12, is there any option to find no of rows and and avg row size for SI sub table. While going through the SQL data defns statements document, collect demographics is mentioned...
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