When Your Dirty Read is Kept Waiting - comment () by carrie
Karam, You can delete all the rows in a partition by specifying a DELETE FROM ppi-table WHERE... command where the partitioning key value or range of partitioning key values describes rows contained...
View ArticleControlling the Flow of Work in Teradata - comment () by Karam
Nice article indeed... to add further , alerts for AMP Worker Tasks generates from TDManager , eg - Threshold Value: 5 Actual Value: 2 Meaning that the lowest threshold value for an AMP is 5 available...
View ArticleControlling the Flow of Work in Teradata - comment () by carrie
If I am understanding you correctly, you are saying is that by the time you get an alert from Teradata Manager that your AMP worker task availability counts have reached some low threshold on at least...
View ArticleControlling the Flow of Work in Teradata - comment () by Terasuda
Hi Carrie, Thanks for the useful and Interesting article on AWT. Couple of days ago I was running a query that returned 70 Million rows in the result set. I got the error message saying "Exception...
View ArticleControlling the Flow of Work in Teradata - comment () by carrie
Terasuda, Both CPU time and CPU Disk Ratio are exceptions that can be defined on a workload in TASM. It would appear that your query exceeded one of those exceptions, which is why you got the error...
View ArticleControlling the Flow of Work in Teradata - comment () by Terasuda
Carrie, Thanks for the clarification
View ArticleSimplifying AMP Worker Task Monitoring and Getting it Right - comment () by...
In your example, the value of workdone represents the work done in 60 seconds. Right?
View ArticleMemory Used by Each Request Held in the Throttle Delay Queue - comment () by...
Carrie, I have a question on throttled queries. There are two options in TDWM for setting up throttle limits: 1. throttle limits in the Workload (WD). 2. limits in the Throttle Object (Rule). Are both...
View ArticleSimplifying AMP Worker Task Monitoring and Getting it Right - comment () by...
There are a couple of different examples of ResUsageSAWT output in the original text. Lets consider them separately. The first example, under the heading The CollectIntervals Column, represents the AMP...
View ArticleSimplifying AMP Worker Task Monitoring and Getting it Right - comment () by...
Carrie, thanks for explaining both the examples. Just to be clear, in the Real-World example, the value of WorkDone=140 corresponds to 600 seconds. And in the SQL Adjustment example, WorkDone=14.00...
View ArticleMemory Used by Each Request Held in the Throttle Delay Queue - comment () by...
You are correct that both workload throttles and object throttles can cause a query to be delayed. Based on the problem you have described, you could be experiencing a situation that existed when...
View ArticleSimplifying AMP Worker Task Monitoring and Getting it Right - comment () by...
Almost, but not quite, so let me try to clear this up for you. (I think you meant "WorkOne", right?) "WorkOne=140" represents the sum of all AMP worker tasks in-use counts for each collect interval...
View ArticleMemory Used by Each Request Held in the Throttle Delay Queue - comment () by...
Thanks for looking into this Carrie. I also tried defining the throttle only on the 'Throttle Object' level and leaving the WD's throttle empty. In that case also, the delaytime was 0 for the queries...
View ArticleSimplifying AMP Worker Task Monitoring and Getting it Right - comment () by...
Got it! This was really helpful, cleared up the confusion. (And yes, I meant "WorkOne") Thanks again.
View ArticleMemory Used by Each Request Held in the Throttle Delay Queue - comment () by...
Monis, Maybe there is some confusion around terminology, or how the delay functionality works: Queries are not actually classified to throttle rules, queries only classify to workloads, which may or...
View ArticleWhat is the Estimated Processing Time? - comment () by GeorgeXiong
then what is the realy user response time? And how to get the auctual run time? the gateing time = user response time - auctual run time?
View ArticleExpedite Your Tactical Queries, Whether You Think They Need It or Not -...
Thanks for the insightful article Carrie and also for sharing the trends at the Teradata sites. I would like to confirm one thing: We can accurately calculate the work done by these reserved AWTs from...
View ArticleExpedite Your Tactical Queries, Whether You Think They Need It or Not -...
The ResUsageSAWT table shows you in-use counts for AMP worker tasks by work type. This table can be useful for understanding how many tasks are active for the expedited work types (usually work8 and...
View ArticleExpedite Your Tactical Queries, Whether You Think They Need It or Not -...
Thanks for the confirmation Carrie.
View ArticleShould You Drop all Multicolumn Statistics that are Over 16 Bytes? - comment...
Hello Carrie You mentioned - "and if the first 16 bytes of all the combined values are identical" Can you eloborate more about it. More importantly how to figure the indentification? You have talked...
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