Question

Collect Statistics

Asked by: arun_11_1980

Hi,

Could any please explain me the use of Collect Statistics in Teradata and how it generates the statistics? Any relevant links for the same will be highly appreciated.

Thanks in advance.

Arun

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Asked On
2009-03-25 at 06:19:05ID24263020
Tags

Teradata

,

Database

Topic

Teradata

Participating Experts
2
Points
125
Comments
3

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Answers

 

by: vinurajrPosted on 2009-03-25 at 06:52:56ID: 23979389

 

by: sparabPosted on 2009-05-27 at 03:17:59ID: 24481399

COLLECT STATISTICS is remarkable.

 Here is how it works. Lets say you have an employee table with 1,000,000 employees. You decide to collect statistics on the column Last_name.
The AMPs will now either do a full table scan or a percentage COLLECT STATISTICS based on which option you choose.
The system will sort the last_name values in the employee table and place the names in 100 intervals. Because the last_name values are sorted and statistics are gathered about all 100 intervals the Parsing Engine can estimate the rows it will need to have the AMPs retrieve.

COLLECT STATISTICS sorts the values and places them in 100 different intervals. The PE can interrogate the intervals to Estimate ranges of values as well as frequent values.

20120131-EE-VQP-002

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