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A Closer Look at Tactical Workload Exceptions - blog entry by carrie
Cover Image: Tactical workload exceptions are in place to prevent tactical queries from consuming unreasonable amounts of resources. It is important to have this protection because the super-priority...
View ArticleEasing Into Using the New AutoStats Feature - comment by csbandi5426
Thank you very much Carrie for the suggestions. I have verified and ANALYZE job , queryband name populating correctly in the DBQLogtbl output. Raised the incident with GSC on the issue and waiting...
View ArticleTeradata Basics: Parallelism - comment by preyesdiaz
I am not sure if this is the right place to post this questin , but as is tittled "Basics", here I go. I need a very simple definition of what a semantic view is. The target population is...
View ArticleTeradata Basics: Parallelism - comment by carrie
Teradata Forum has a category called "Data Modeling" which describes itself as: Discussion topics on Logical Data Models, Physical Data Models, and Semantic Modeling Building Blocks. You can find...
View ArticleStatistics Threshold Functionality 101 - comment by sk6752
In 14.10, I understand System Threshold option is enabled when SysChangeThresholdOption = 0 (Enabled with DBQL usage). I understand that optimizer does not skip re-collections when use count logging is...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by...
Carrie, When collecting stats in the following format, it was my understanding that the table is read once; similar to what I have been told about just collecting at the table level. COLLECT STATS...
View ArticleA Closer Look at Tactical Workload Exceptions - comment by HarshaKudumula
Hi Carrie, Is there a way to control RESPONDING STATE of large extracts using TASM Exceptions? i know we can use IO Physical Bytes but it is umbrella for all kind of activites like spool across joins,...
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Reserved AMP Worker Tasks Exclusively for Utility Jobs, Maybe - blog entry by...
Cover Image: Teradata is a message passing system. Messages are sent from parsing engines to AMPs, and from AMPs to AMPs, and from AMPs to parsing engines. That’s the key way that components in a...
View ArticleStatistics Threshold Functionality 101 - comment by carrie
You are correct that usecount logging must be enabled for the database involved before skipping will be considered. You don't have to specify USING SYSTEM THRESHOLD on the collect stats statement for...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by carrie
Hi Mark, The optimizer will ATTEMPT to collect multiple stats in one pass of the table when you use the coding below, but often it decides there is no cost savings in doing so and will revert to...
View ArticleA Closer Look at Tactical Workload Exceptions - comment by carrie
Harsha, Unfortunately, there is no option in TASM to manage a query once it moves into the responding state. TASM relinquishes all control at that point. I'm not sure I have any other suggestions...
View ArticleA Closer Look at Tactical Workload Exceptions - comment by HarshaKudumula
Yes, i did but thanks for your prompt response.
View ArticleExpediting Express Requests - comment by kqn1
Hi Carrie, Can you expand on the ParserExpReq values in the DBQLogTbl? When should I be concerned as I see many occurences of ParserExpReq with values of 5 or higher (sometimes 30+) and happenning...
View ArticleUsing the ResUsageSAWT table to Monitor AMP Worker Tasks - comment by kqn1
Very useful information Carrie - thank you very much for these blogs. Can you also include another table (If Inusemax...That means...Then do this...) for an example of default of 80 AWTs and 5 reserve...
View ArticleEasing Into Using the New AutoStats Feature - comment by ms628255
Hi Carrie, one short question that came up from a customer. What happens if a table is being renamed and a new table is being created with the old name? Is the Stats Manager based on tableID and keeps...
View ArticleStatistics Threshold Functionality 101 - comment by geo590
Hi Carrie, Great article. Is there an easy way to refresh ALL existing statistics on a table USING NO THRESHOLD? It looks like you need to specify an explicit column / index when the USING command is...
View ArticleExpediting Express Requests - comment by carrie
What is a "high" value for ParserExpReq depends on the the complexity of the queries being executed and whether the system is congested or not. You could try to establish a "normal" ParserExpReq time...
View ArticleUsing the ResUsageSAWT table to Monitor AMP Worker Tasks - comment by carrie
This is explained in a different blog posting titled "How to Calculate Your Max Number of Usable AMP Worker Tasks" at this location:...
View ArticleStatistics Threshold Functionality 101 - comment by carrie
Hi George, Offhand, I don't know of a way to apply USING NO THRESHOLD to all the stats for a table. You could turn off SysChangeThresholdOption if you don't want threshold to be applied to any stat...
View ArticleHow Resources are Shared in the SLES 11 Priority Scheduler - comment by nagad
Hi Carrie, Can you please breif the purpose of SLG in timeshare workloads on 2800 appliances. Thanks
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