CPU Limits at Multiple Levels - comment by trustngs
Fine Carrie, thank you very much.-Ganapathy
View ArticleAutomated Demotions on the Appliance: What are Query Milestones? - comment by...
Hi Ruth,I am assuming you are talking about an Appliance platform. On the Appliance you can issue a SET SESSION ACCOUNT to change the priority of a running query. It is one of the monitor commands,...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by...
Carrie:A little guidance on how Version14 may (or may not) be able to help with out environment. We have tables that are multbillion row tables and the data in those tables becomes cold quickly. After...
View ArticleHow to Calculate Your Max Number of Usable AMP Worker Tasks - comment by carrie
Response 1: 62 is the number of AWTs that will be available to support user work if you have the default number of 80 AWTs per AMP. I think that is what you were trying to say, but I wanted to clarify...
View ArticleHow to Calculate Your Max Number of Usable AMP Worker Tasks - comment by gsoh
HI, Carrie This article is really helpful. I've got a question.Formula mentioned above, please explain once again. Why Reserve at 5, But Why -12...If we specified 100 AWTs/AMP and set a reserve at 5,...
View ArticleHow to Calculate Your Max Number of Usable AMP Worker Tasks - comment by carrie
You second paragraph is correct. If you have 100 AWTs per AMP, 24 will be used for the standard reserve pools, leaving 76 (100 - 24 = 76). Add 6 to that 76 (because you can use three each for the...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by carrie
What you can do in 14.0 is to recollect SUMMARY stats on the table after each load winder. SUMMARY stats on the table are very quick and carry information that will help the optimizer produce...
View ArticleDatabase Tasks that Run on the Parsing Engine - comment by danR
Hi Carrie: The AWT , i'm assuming, has a control record ? - If so, is there documentation regarding the AWT 'control' record (for lack of a better word) - with explanations for each field.
View ArticleDatabase Tasks that Run on the Parsing Engine - comment by carrie
Hi Dan,AMP worker task work type definitions are not held anywhere in the database and there is no control record that describes them as far as I know. I'm assuming that that type of detail is...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by...
Hi Carrie,I am using Teradata 12. I created a table with single column NUSI and collected stats on the index. Then i dropped the index. Still i able to see the stats using help stats and in...
View ArticleUtility Session Management - It's Inside the Database in Teradata 13.10!...
Hi Carrie,Great Article!! I have couple of questions here.1) We are on 13.10 and viewpoint V 14.02. We have max sessions set to 10. So if there are say 7 fastload jobs running , we would have 70 active...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by carrie
When you drop a single-column index, the single-column statistics will remain and can be used by the optimizer in generating a plan. The stats are still valid. However, if you have an index on...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by...
Thank you very much Carrie. Got clarified now.
View ArticleUtility Session Management - It's Inside the Database in Teradata 13.10!...
Roopalini,In terms of total number of sessions, you are correct that each PE is limited to 120, so you can multiply the number of PEs by 120 and that is the max number of sessions your system can...
View ArticleUtility Session Management - It's Inside the Database in Teradata 13.10!...
Thanks for the response Carrie!!
View ArticleTeradata 13.10 Statistics Collection Recommendations - comment by suhailmemon84
I've always had this question and unable to find a clear cut answer. For a partitioned table, is collect stats on "PARTITION" the same as collecting stats on the column on which PPI is defined?I'm...
View ArticleTeradata 13.10 Statistics Collection Recommendations - comment by MarkVYoung
Hi Carrie, We are running TD 13.10 and I remember from earlier versiosn that there was a recommendation to not have too many empty partitions, ie not to over-partition the table. Does the collecting of...
View ArticleTeradata 13.10 Statistics Collection Recommendations - comment by carrie
Suhail,PARTITION stats counts the rows in each partition of the table, so the optimizer knows how many are empty, and if not empty, how full. This is used for estimating I/O costs for the...
View ArticleTeradata 13.10 Statistics Collection Recommendations - comment by carrie
Hi Mark,Empty partitions are not an issue if PARTITION stats are collected. PARTITION stats are important because they tell the optimizer how many and which partitions are empty. So you should be fine....
View ArticleHow to Calculate Your Max Number of Usable AMP Worker Tasks - comment by macktd
Hi, Carrie I Have Dubious on Work Eight, Supports 20 unreserve pools Work nine, Supports 20 unreserve Pools Work ten supports 2 unreserve poolsMy Question is 24 are reserved out of 80...
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