Statistics Collection Recommendations – Teradata 14.10, 15.0 and 15.10 -...
Katie, The above posting constitutes overall recommendations on what statistics to collect. You will have to evaluate which columns in your tables these recommendations apply to. There is a similar...
View ArticleStatistics Collection Recommendations – Teradata 14.10, 15.0 and 15.10 -...
Hi Carrie, Good Morning, i have few questions. One of our Customer went to TD 14.10 last year but the NoDot0Backdown is still False. I recently join the team and am planning to propose to set it TRUE....
View ArticleStatistics Collection Recommendations – Teradata 14.10, 15.0 and 15.10 -...
One more question. Is there any way to check if the Extrapolations happened was due to Random/Dynamic Amp Sampling or Optimizer used UDI information. In other words, can we check which of the above two...
View ArticleStatistics Collection Recommendations – Teradata 14.10, 15.0 and 15.10 -...
RESPONSE TO FIRST QUESTION: Even if you have usecount logging on, the information is not able to be stored in the statistics histogram, and therefore cannot be used for extrapolation or to properly...
View ArticleStatistics Collection Recommendations – Teradata 14.10, 15.0 and 15.10 -...
RESPONSE TO SECOND QUESTION: If UDI counts are available, they will always be used instead of random AMP sampling. So if you see that your histogram for that statistic carries UDI counts then you...
View ArticleHow Resources are Shared in the SLES 11 Priority Scheduler - comment by desai51
Hi Carrie, I am trying to understand the pros and cons of Virtual Partitioning (VP), specifically Dynamic Virtual Partitioning. We have a shared system where two sister companies sharing the cost with...
View ArticleHow Resources are Shared in the SLES 11 Priority Scheduler - comment by carrie
Amit, You are correct in your basic understanding of how dynamic virtual partitions work. I also agree with you that using the dynamic sharing of resources between virtual partitions is preferable...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by...
Hi carrie, Is there a benefit in collecting stats on the ROWID column in a join index? For the first time today, we saw a recommendation from Stats Manager to collect stats on ROWID column of a join...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by carrie
Hi Nazy, I can't think of any reason there would be a value in collecting stats on rowID. RowIDs are often used in single-table join indexes as a means for the database code to get from the join...
View ArticleStatistics Collection Recommendations – Teradata 14.10, 15.0 and 15.10 -...
Hi Carrie, We are in 14.10 .We have set NoDot0Backdown = False in the control file. Currently I created few Analyze jobs in stats manager for databases I enabled use count logging. The analyze job...
View ArticleUsing the ResUsageSAWT table to Monitor AMP Worker Tasks - comment by hv186006
Hi Carrie, A question from the Netherlands. We are with a customer with a 2700 box and we are experiencing issues with respect to the performance at the moment. We are not seeing any strange statistics...
View ArticleUsing the ResUsageSAWT table to Monitor AMP Worker Tasks - comment by carrie
Hi Helena, If you are running out of AMP worker tasks (AWT) that can slow a query down. Query steps require AWTs to execute, and if all the AMPs a query step is running in do not have an available...
View ArticleStatistics Collection Recommendations – Teradata 14.10, 15.0 and 15.10 -...
Chandrasekhar, The NoDot0Backdown setting needs to be changed to TRUE. The logic used by Analyze Jobs to detect staleness relies on UDI counts from USECOUNT logging in conjunction with the defined...
View ArticleDetermining Precedence Among TASM Planned Environments - comment by...
Hi Carrie, I need to create a new workload and a new planned environment. No problem here... The new workload needs to be in SLG Tier2 during the new planned environment,, but then in Timeshare...
View ArticleDetermining Precedence Among TASM Planned Environments - comment by carrie
Hi Nazy, It is not a recommended practice to move a workload to a different tier across planned environments. I don't believe Viewpoint Workload Designer will even allow you to do that. Extra...
View ArticleDetermining Precedence Among TASM Planned Environments - comment by...
Hi Carrie, Thanks for the information. Yes, Workload Designer is not letting me. Once I move the workload to SLG in on environment, it moves the workload from all environment to SLG... Just wanted to...
View ArticleDetermining Precedence Among TASM Planned Environments - comment by carrie
Nazy, Unfortunately, I can't tell you what settings would be best for you without being there on site and seeing all the workload management detail as a whole. But I can suggest that you need to...
View ArticleDetermining Precedence Among TASM Planned Environments - comment by...
Thank you Carrie, great information....
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