Statistics collection recommendations – Teradata 14.0 - comment by vasudev
Hi, Sorry for asking very basic question. But i wanted to know the difference. I am having a table A like this Col1 int, Col2 int, col3 int, col4 int, col5 int PI(Col1) NUSI1(Col2) NUSI2(Col3,Col4) Is...
View ArticleStatistics collection recommendations – Teradata 14.0 - comment by vasudev
I got the answer for my question from Carrie's blog posted on 19-Sep-2012. Carrie, Please correct me if i am wrong. Column level stats is helpful even if the indexes are dropped still stats will exist....
View ArticleStatistics collection recommendations – Teradata 14.0 - comment by vasudev
Adding on to the above one i am intrested to understand about the order of columns used in multi column stats. In TD 12 whether it makes any difference. Say taking the same above mentioned scenario. On...
View ArticleUtility Session Management - It's Inside the Database in Teradata 13.10!...
As a continuation to my question above.... I just went through your another forum posting (at http://developer.teradata.com/blog/carrie/2012/06/eliminating-unplanned-delays-within-load-utility-jobs)...
View ArticleUtility Session Management - It's Inside the Database in Teradata 13.10!...
Geeta, The reason for separating non-utility work at the WD level by means of Utility classification is three-fold: 1.) As you already mentioned, for reporting and analysis purposes, and 2.) so the...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by...
I read the below from Developers exhange earlier (for 13.10), wondering whether these guidelines are still good with 14.10 version too, or anything changed? Guidelines for Stats Collection...
View ArticleNew opportunities for statistics collection in Teradata 14.0 - comment by carrie
There is posting here on Dev that addresses 14.10 statistics recommendations. Information contained there should answer your question:...
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New, Simplified Approach to Parsing Workload Selection - blog entry by carrie
Cover Image: As of Teradata Database 14.10.05 and 15.00.03, a simplified approach to determining which workload will support session management and parsing has been adopted This posting describes this...
View ArticleWhy collect PARTITION statistics on Non-Partitioned tables? - comment by...
Do collecting [partition] only stats on a daily basis for all tables will cause extrapolation process to never work ? we have an after data loadnig daily morning job which collects [partition] columns...
View ArticleEasing Into Using the New AutoStats Feature - comment by haritha_a
Carrie, We recently enabled USECOUNT on our system and set the DBS Control field NoDot0Backdown to true to make use of version 6 stats. We could see some date sensitive queries that look at current day...
View ArticleEasing Into Using the New AutoStats Feature - comment by carrie
Haritha, One thing to check. When you access DBC.ObjectUsage its best to use one of the DBC views for that purpose. When you access UDI counts for a table, those table-level ObjectUsage rows will...
View ArticleWhy collect PARTITION statistics on Non-Partitioned tables? - comment by carrie
Collecting statistics on PARTITION only applies in Teradata releases BEFORE 14.0. After 14.0 you do not want to collect on PARTITION for all tables, only for partitioned tables. In releases 14.0 and...
View ArticleNew, Simplified Approach to Parsing Workload Selection - comment by mb255021
Hi Carrie, Excellent article quick and useful. Two questions how does Teradata normally do the same operation absent this technique? And how can I measure the benifit I get after implementing this,...
View ArticleNew, Simplified Approach to Parsing Workload Selection - comment by carrie
There's an earlier posting that explains the earlier approach to how the parsing workload is selected:...
View ArticleWhy collect PARTITION statistics on Non-Partitioned tables? - comment by...
Thank you Carrie for your feedback. But Based on the explaination in the blog i can't understand how extrapolation will still work with a current statistics for partition/summary. Let me exlpain my...
View ArticleWhy collect PARTITION statistics on Non-Partitioned tables? - comment by carrie
Growth detection relies on both RAS comparisons and row count comparisons. Extraploation only happens if growth in a table that the statistic belongs to (let's call that statistic p_name) is detected....
View ArticleExpediting Express Requests - comment by SmarakDas
Hello Carrie, Wonderful Article. I have a few questions concerning Expediting Express Requests: (a) You have mentioned the DBQLogTbl Column "ParserExpTime" denoting the time in seconds for Express...
View ArticleDetermining Precedence Among TASM Planned Environments - comment by SmarakDas
Hello Carrie, Well-written Article. I have 01 question: (a) For PE, the rightmost PE will take the highest precedence irrespective of whether the DBA wishes or not. For Health Condition, is it the...
View ArticleStatistics Collection Recommendations – Teradata Database 14.10 - comment by...
Very valuable article. Thanks Carrie. In Teradata 14 onwards, we have this feature wherein the individual stats information of Col(A) & Col(B) can be used for Col(A,B) if the stats on Col(A,B) is...
View ArticleEntering and Exiting a TASM State - comment by SmarakDas
Hello Carrie, Thanks for the article. I would like to understand the relationship between the intervals by an analogy (I have used comparatively larger number for clarity): Event Interval is 120...
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