Easing Into Using the New AutoStats Feature - comment by Sandeepyadav
Hi Carrie, I have doubt regarding BLC and MVC tables.What will be the stats manager behavior (CPU,IO etc) for MVC and BLC tables? will the stats proccess will be slow?
View ArticleUsing the ResUsageSAWT table to Monitor AMP Worker Tasks - comment by dins2k2
Carrie, It seems WorkTypeInuse00, WorkTypeInuse01 vaules fromDBC.ResUsageSawt/PDCRINFO.ResUsageSAWT are returning wrong values. And the total awt count (WorkTypeInuse00+WorkTypeInuse01)is showing...
View ArticleUsing the ResUsageSAWT table to Monitor AMP Worker Tasks - comment by carrie
Dinesh, I am not clear from your comments if you seeing invalid values in the DBC.ResUsageSAWT table itself, or in some other table where you have offloaded the DBC table's data. It would be a little...
View ArticleEasing Into Using the New AutoStats Feature - comment by carrie
You mentioned both multivalue compression. There is no overhead when reading a table that contains multivalue compression. Please refer to the Database Administration Manual if you need help in...
View ArticleUsing the ResUsageSAWT table to Monitor AMP Worker Tasks - comment by dins2k2
Carrie, Right now we have TD 14.10(6750) and we had TD 12(5550). Below is the output of DBC.ResUsageSAWT for TD 14.10 TheDate|VprId|Node...
View ArticleTeradata 13.10 Statistics Collection Recommendations - comment by sg0890603
Carrie Is it possible to avoid a Slinding window Join for a Particular Query?
View ArticleTeradata 13.10 Statistics Collection Recommendations - comment by carrie
Teradata does not support hints to the optimizer. So there is no mechanism to say don’t use a sliding window join. In general, a sliding window join is beneficial as it joins the two tables without...
View ArticleUsing the ResUsageSAWT table to Monitor AMP Worker Tasks - comment by carrie
Hi Dinesh, The AWTLimit field in ResUsageSAWT was first introduced in 14.0. AWTLimit did not exist in the SAWT base table in earlier releases, such as 12.0. These are the only AMP worker task...
View ArticleUsing the ResUsageSAWT table to Monitor AMP Worker Tasks - comment by dins2k2
Carrie, Thanks for the detailed explaination. What you said was right, output from 12.0 IS NOT in summary mode and the 14.10 output IS in summary mode and each node has 36 AMPs, after checking the...
View ArticleUsing the ResUsageSAWT table to Monitor AMP Worker Tasks - comment by carrie
Dinesh, I found information about setting or unsetting the summary flag on page 73-74 of Graphical User Interfaces: Database Window and Teradata MultiTool manual. B035-1095-067A. According to this...
View ArticleUsing the ResUsageSAWT table to Monitor AMP Worker Tasks - comment by dins2k2
Carrie, Thanks for your valuable information and help. Thanks, Dinesh
View ArticleIntrepreting DBQL DelayTime in Teradata 13.10 - comment by harithakatta
Hi Carrie, Thank you for expaling the DelayTime. Have a question. If I see Null in delaytime filed (no WD or System delay) and I see a difference in StartTime vs FirstStepTime in DBQL, can I assume the...
View ArticleIntrepreting DBQL DelayTime in Teradata 13.10 - comment by carrie
Haritha, Basically, you can take the difference between StartTime and FirstStepTime and assume that it represents parsing time. But if there delay time due to a throttle, then that difference will...
View ArticleEntering and Exiting a TASM State - comment by Huzain
Thanks Carrie, This was something which i need. we have on other system on which we have applience TASM (TD SYSTEM 2700, RDBM 14 .10.10.04.06). there is same requirment as metnioned above (Same User...
View ArticleEntering and Exiting a TASM State - comment by carrie
In 15.0 you have an option to create multiple planned environments on the appliance platform. When you get to that release you will be able to automate a change the priority of workloads from one...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by...
Hi Carrie, I have some doubt. please help: 1. If a table is being accessed only by PI then do we still need to collect stats on table. 2. if table is well distributted(zero skewness) and this table is...
View ArticleStatistics Threshold Functionality 101 - comment by HarshaKudumula
Hi Carrie, A very nice article about thresholds. Actually, We are in 14.10 DBMS Version and thought to implement AutoStats, but since we don't have a bug (DR's) free version in 14.10, we thought to go...
View ArticleExpediting Express Requests - comment by Rahul
Carrie, Thank you for the extremely informative blog. What in your opinion should be considered a threshold value for ParserExpReq which will warrant the need for expediting express requests ? Or,...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by carrie
Hi Sandeep, Here are responses to your questions: 1. Whether or not you will need to collect stats depends on whether it is a UPI or a NUPI. For example, a UPI does not generally require...
View ArticleTwo Levels of Concurrency Control for Load Utilities in Teradata 13.10 -...
Hi Carrie, We are using 14.10 here. In TASM we have created one tactical workload with criteria "Include queries that do not use all AMPs". When we checked DBQL data we saw some TPTEXP queries (like...
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