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Message Posted: Sat, 22 Jun 2003 @ 01:06:46 GMT


     
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Subj:   Explaing EXPLAIN
 
From:   Anomy Anom

<-- Anonymously Posted: Tuesday, June 17, 2003 15:22 -->

Hello,

I'm fairly new to Teradata and I'm trying to make sense of the EXPLAIN output.

What does the following step do exactly? I have been trying to find where the EXPLAIN statements themselves are explained but I have had no such luck.

Explanation
--------------------------------------------------
 
  1)First, we lock a distinct TEST."pseudo table" for write on a RowHash to prevent global deadlock for TEST.test1.  


I have seen this say "read" as well. Also, some SQL explanations don't have this global deadlock prevention step -- when and where is it needed?

Is there a place in the manuals that explains all of the various EXPLAIN statements? I'm very tired of the word "explain" now. :-)


Thanks.



     
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