Statistics Collection Recommendations – Teradata Database 14.10 - comment by...
Hi Carrie. I detected a strange behavior on on Teradata 14.10. As soon as I am executing the statement "HELP STATS ON TheTable;" on a table without any statistics collected, I receive the error...
View ArticleExpediting Express Requests - comment by oshun
Hi Carrie, just to be sure that I get it right: This new feature of "express requests" basically means that there is a work type with higher priority used for tactical workload(08/09). Is this correct?...
View ArticleGlobal Weights in SLES 11 Priority Scheduler - comment by oshun
Hi Carrie, you mention that Tactical workload always runs in Work08/09. Does this mean that the "EnableExpediteExp" parameter is not used anymore?
View ArticleA Closer Look at How to Set up a Parsing-Only Workload - comment by Superflash
Hi Carrie Would this parsing only workload work in a similar fashion for SLES10 V14.00/14.10 ? i.e. could we force query parsing into a high prioirty TASM group .. Thanks Nick
View ArticleStatistics Collection Recommendations – Teradata Database 14.10 - comment by...
In general, HELP STATS doesn’t do anything to the confidence levels. However, one possibility could be random AMP sampling. The HELP STATS operation logic triggers all-AMP random AMP sampling,...
View ArticleNew, Simplified Approach to Parsing Workload Selection - comment by sghanw
I agree with Sandeep, i too see similar behaviour. Question: Why there is no workload information present for Fastlaod sessions in ViewPoint. Workload Info section is Blank for all the session in the...
View ArticleExpediting Express Requests - comment by carrie
Roland, "Express requests" are not a new feature. Did you mean "the ability to expedite express requests"? That is a new capability. If that is what you meant, then what are saying is correct....
View ArticleGlobal Weights in SLES 11 Priority Scheduler - comment by carrie
Roland, Enable expedited express requests allows express requests to use the same higher work types as tactical requests. But express requests will only be expedited if there are reserves set up for...
View ArticleA Closer Look at How to Set up a Parsing-Only Workload - comment by carrie
Nick, Parsing prioritization is based upon the concept of session classification. Session classification happens with TASM if you are on either SLES 10 or SLES 11. It also happens on SLES 11 with...
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Teradata Basics: Parallelism - blog entry by carrie
Cover Image: This “Teradata Basics” posting describes the current dimensions of parallelism in the Teradata Database, and how they work together. What is Query Parallelism?Executing a single SQL...
View ArticleNew, Simplified Approach to Parsing Workload Selection - comment by carrie
Sachin, I am not familar with that situation. You may want to open an incident with the support center, or ask your question of someone with expertise in Viewpoint. Thanks, -Carrie
View ArticleEasing Into Using the New AutoStats Feature - comment by JustMe
Hi Carrie, I was perusing the AnalyzerHistoryTbl and while I can figure out what happens with most of the Event Types, I am wondering what is the purpose of the rows with an EventType = 'u'. Does that...
View ArticleEasing Into Using the New AutoStats Feature - comment by JustMe
Actually, is there a document that gives the expected values and their usage interpretations for the StatsTbl and the AnalyzerHistoryTbl?
View ArticleRecommended Dictionary Statistics to Collect in Teradata 14.0 - comment by...
Hi Carrie, We recently upgraded to 15.00. Would you please provide the list of stats to be collected on DBC after the upgrade? Appreciate your time! Thanks Roopalini
View ArticleEasing Into Using the New AutoStats Feature - comment by carrie
An EventType of ‘U’ indicates an existing collected statistic was observed as being Used during query optimization as recorded by the DBQL STATSUSAGE logging option. When related column...
View ArticleRecommended Dictionary Statistics to Collect in Teradata 14.0 - comment by...
Roopalini, I don't have a list of DBC stats recommendations focused especially onr the 15.0 release. What you can do is use the recommendations in the blog posting for collecting stats on the...
View ArticleRequest Cache Hits & Misses - comment by LUCAS
Hi Carrie, i come back in the discussion to ask for possible updates (V15 and UDA too ...): About those modifications of dictionary objects - table, column, table header, stats - that have the effect...
View ArticleRecommended Dictionary Statistics to Collect in Teradata 14.0 - comment by...
Thanks Carrie! Will do that.
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