↧
Channel:
Teradata Developer Exchange - Blog activity for carrie's blog
X
Are you the publisher?
Claim or
contact us
about this channel.
X
0
Channel Details:
- Title: Teradata Developer Exchange - Blog activity for carrie's blog
- Channel Number: 4274858
- Language: English
- Registered On: September 10, 2012, 9:21 pm
- Number of Articles: 1058
- Latest Snapshot: June 6, 2019, 4:01 am
- RSS URL: http://developer.teradata.com/blog/carrie/rss.xml
- Publisher: http://downloads.teradata.com/blog/carrie
- Description:
- Catalog: //teradata138.rssing.com/catalog.php?indx=4274858
© 2025 //www.rssing.com
Hi Ian,
That auto adjustment to the sampling percent is not done in 14.0. This is implemented in 14.10. Somehow, this statement made it into the document prematurely, and I have put in a request for it to be corrected.
The purpose of the SYSTEM option in 14.0 is the following: If you have, for example, explicitly asked for sampling at 10% and now want to return to whatever is stated in DBS Control (by default this is 2%), then by stating SYSTEM SAMPLE, you will be returned to the higher, system-level specification. If the system percent as represented in DBS Control should change, this statistic will be sensitive to that change. In later releases SYSTEM SAMPLE will take on additional meaning related to automating the system percent based on what the optimizer sees as appropriate, but we are not at that point yet. So SYSTEM in the using clauses is somewhat of a place-holder for future functionality.
Thanks, -Carrie