Tips on using Sampled Stats - comment by carrie
Y.C.The default for USING SAMPLE is 2%, it can be modified globally using a dbscontrol field, but it's one of the internal parameters, as you have noticed. Internal settings are designed to be changed...
View ArticleUtility Session Management - It's Inside the Database in Teradata 13.10!...
Hi Mark,The best way to determine the number of load utilities active at any point in time using the workload management APIs. Workload Management API consists of interfaces to PM/APIs and open APIs....
View ArticleUtility Session Management - It's Inside the Database in Teradata 13.10!...
Carrie, Thanks for that, looks like what I am after. Is this function also likely to pickup idle sessions, as I have no load jobs actually running but get the following result:- UtilityType...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by carrie
Table level recollections of stats in Teradata 14.0 will remember the USING options at each statistics level and apply them at recollection time. To continue to use the same USING options, do not...
View ArticleUtility Session Management - It's Inside the Database in Teradata 13.10!...
Mark,If you are using MLoad 14.00.00.06, that erroneous utility count for MultiLoad could be due to a known TTU problem which has been fixed in MLoad14.00.00.07. Even without the fix, the count should...
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Database Tasks that Run on the Parsing Engine - blog entry by carrie
Cover Image: Most of us are aware of AMP worker tasks, and some of us are even obsessive about not running out of this finite resource. But that’s on the AMP. What about the tasks supporting user...
View ArticleDatabase Tasks that Run on the Parsing Engine - comment by abhijitvyas
Thanks Carrie for the details and as always its useful. is this recorded any where in Resusage like SAWT & SPS for AWTs ?
View ArticleDatabase Tasks that Run on the Parsing Engine - comment by sumank
Hi Carrie,I want the list of tables not being used since 3 months in porduction. In over environmnet the Last Access time stamp and Access count is not enabled so please help me how to get the unused...
View ArticleDatabase Tasks that Run on the Parsing Engine - comment by carrie
Abhijit,The ResUsageSAWT table does not contain anything about parsing engine tasks, as its focus is AMP worker tasks exclusively. The SPS table does produce information about priority scheduler...
View ArticleDatabase Tasks that Run on the Parsing Engine - comment by carrie
Suman,The Access Count functionality was designed to provide exactly the information you are asking for. If you choose not to use it, the only alternative I can think of is to start collecting object...
View ArticleFlow Control and Spawned Work - comment by pietro.nardella
Hi Carrie, two very simple question: 1 - how can I know what is the maximum number of AWT(s) per AMP(s) ? (I run Teradata 13.10) 2 - In the resAWT macro, the max columns include all the AWT(s) in use ?...
View ArticleControlling the Flow of Work in Teradata - comment by mikesteeves
Thanks again Carrie for a great explanation of a confusing topic! I read a post somewhere along the way by someone who said he was using Viewpoint to generate reports on AWT usage and then reviewing...
View ArticleFlow Control and Spawned Work - comment by carrie
Pietro,Max number of AWTs per AMP as of 13.0 is 500, although we never advise anyone to go much above 110 or 120 today. It's there for the future. Prior to 13.0 is was 120.The Max fields in the ResAWT...
View ArticleControlling the Flow of Work in Teradata - comment by carrie
Hi Mike,In Viewpoint, I've only ever used the Metrics Analysis portlet and the Capacity Heatmap for viewing AWT levels. I am not familiar with any reports being generated from Viewpoint.Try posting the...
View ArticleControlling the Flow of Work in Teradata - comment by gryback
The trend portlets (Capacity Heatmap and Metrics Graph) under the System metrics choice will plot out "AWT" (Average number of AMP worker tasks in use on each AMP) as well as "CPU AWT Processing". The...
View ArticleFlow Control and Spawned Work - comment by mikecyl
Hi Carrie,I wonder whether there is a way to find out that a query is delayed by the flow control of AWT.There are some information telling us that in DBQL?Thanks C. Y.
View ArticleFlow Control and Spawned Work - comment by carrie
Hello C.Y.There is no way that I know of to identify if an individual query was delayed waiting to get an AWT. You can, however, see whether requests within a workload were delayed waiting for an AWT,...
View ArticleSimplifying AMP Worker Task Monitoring and Getting it Right - comment by...
Hi Carrie, I want to know the general usage of DBC.ResUsageSAWT table. When i saw the column details, it contains lot many columns. Is there any way we can indentify whether the the user is out of awt...
View ArticleFlow Control and Spawned Work - comment by pietro.nardella
Hi Carrie, thanks for your reply. I'd like to redo my question:" 1 - how can I know what is the maximum number of AWT(s) per AMP(s) ? (I run Teradata 13.10) "and ask if there is a system table where I...
View ArticleSimplifying AMP Worker Task Monitoring and Getting it Right - comment by carrie
Ganapathy,The ResUsageSAWT table is primarily useful for assessing AMP worker task metrics by AMP. It provides AWT in-use counts and maximum in-use counts across the logging interval by work type for...
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