New opportunities for statistics collection in Teradata 14.0 - comment by...
Asking see I see this: show statistics column (orig_sys_id) on NA_EDW.WHSE_INV_LOC COLLECT STATISTICS -- default SYSTEM SAMPLE PERCENT -- default SYSTEM THRESHOLD...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by carrie
Hi Nazy, The SysSampleOption is to enable or disable system-determined sample percent globally. When it is enabled, the system decides whether or not to using sampling, and at what percent. When an...
View ArticleControlling the Flow of Work in Teradata - comment by er.vipin
Hi Carrie, Thanks for the nice article. I have a question about Message Queue length. You stated that Message queue length will be 20 for nodes <16 but I have seen more than 20 messages waiting on...
View ArticleControlling the Flow of Work in Teradata - comment by carrie
Vipin, One of the points I tried to make in the posting above had to do with the limit of 20 messages being associated to the work type: "The message queue on each AMP has a limit of how many...
View ArticleControlling the Flow of Work in Teradata - comment by er.vipin
Thank you Carrie for clarifying my doubt. I think I overlooked "each worktype" phrase in explaination.
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A Closer Look at How to Set up a Parsing-Only Workload - blog entry by carrie
When you think about priorities, you probably focus your attention on AMP work. Whether you are using Teradata Active System Management (TASM) or Teradata Integrated Workload Management (TIWM), AMP...
View ArticleA Closer Look at How to Set up a Parsing-Only Workload - comment by rrundo
Hi Carrie, I used the Parsing Workload you describe at one of my customers who is running TD14.10/SLES11 with VP15. This workload is working perfectly. But, if I do not use this WD all the parsing work...
View ArticleA Closer Look at How to Set up a Parsing-Only Workload - comment by carrie
Roberto, There is no "default" workload for just parsing. Parsing will happen at the same workload that the session's logon uses. Depending on the number of workloads defined and their...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by...
Hi Carrie, Thanks for introducing me to the world of collect stats in TD 14.10. With the TD 14.1 recommendations on collect stats, I could see savings upto 33% in TotalIOCount, 47% in AMPCPUTime, 2% in...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by carrie
Sudhakar, Different statistics collections on different tables will behave differently when you move to either 14.0 or 14.10 from an earlier release. I am glad to hear that you are seeing resource...
View ArticleUtility Session Management - It's Inside the Database in Teradata 13.10!...
Hi Carrie, I want to start with "Happy New Year" first :) Coming to my question, sometime back i read your posting on Evaluation Order from TD Magazine. In that you mentioned the order of the workloads...
View ArticleUtility Session Management - It's Inside the Database in Teradata 13.10!...
And just forgot to ask related question on eval.order, i heard that in 14.0, the eval order was removed and there will be only one evaluation order for all. Is it true?
View ArticleRejection CAN be Rewarding - comment by geethareddy
hi Carrie, I wanted to ask the same question asked by AbeK but for different reason. We have a stats process owned by application dba and other teams ownership. Being a system dba, now a days i am...
View ArticleExpediting Express Requests - comment by danR
Hi Carrie: Reading up on Columnar, what is the difference between column partitioning and row-based multi-value compression. Am assuming that both use a compression and de-compression algorythm....
View ArticleUtility Session Management - It's Inside the Database in Teradata 13.10!...
Response to Geeta's first posting above: If you only have 40 workloads, then it really doesn't matter from the performance perspective if you re-order the evaluation order list based on workoads with...
View ArticleUtility Session Management - It's Inside the Database in Teradata 13.10!...
Response to Geeta's second posting above: In 14.0, you will still have a workload evaluation order, but you no longer have the ability to change the workload evaluation order across different states....
View ArticleUtility Session Management - It's Inside the Database in Teradata 13.10!...
Thank you very much.
View ArticleExpediting Express Requests - comment by carrie
Hi Dan, Those two are not really very comparable, other than within the columnar functionality you may experience something called autocompression if you define a partition with a type of column. But...
View ArticleUtility Session Management - It's Inside the Database in Teradata 13.10!...
Carrie, just one last question. From your presentation, i heard one important point that you have emphasized a lot is to have a seperate the utility work in to seperate workloads having classification...
View ArticleRejection CAN be Rewarding - comment by carrie
I believe you can use a period event type to do this. I have not done this myself, but you should be able to set up a TASM event that triggers a program to run at specific times, by doing the...
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