EXPLAIN Request Modifier with a DELETE Statement - Advanced SQL Engine - Teradata Database

SQL Data Manipulation Language

Product
Advanced SQL Engine
Teradata Database
Release Number
17.00
Published
September 2020
Language
English (United States)
Last Update
2021-01-23
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qtb1554762060450.ditamap
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dita:id
B035-1146
lifecycle
previous
Product Category
Teradata Vantage™

This EXPLAIN request modifier shows the steps performed to execute the DELETE statement and the outcome of the application of the DELETE and SELECT constraints.

       EXPLAIN DELETE FROM rls_tbl WHERE col1=2;

The system returns this EXPLAIN text.

 *** Help information returned. 10 rows.
 *** Total elapsed time was 1 second.
Explanation
----------------------------------------------------------------------
  1) First, we do a single-AMP DELETE from RS.rls_tbl by way of the
     primary index "RS.rls_tbl.col1 = 2" with a residual condition of (
     "((SYSLIB.DELETELEVEL (RS.rls_tbl.levels ))= 'T') AND
     (((SYSLIB.SELECTLEVEL (2, RS.rls_tbl.levels ))= 'T') AND
     (((SYSLIB.DELETECATEGORIES (RS.rls_tbl.categories ))= 'T') AND
     ((SYSLIB.SELECTCATEGORIES ('90000000'XB, RS.rls_tbl.categories ))=
     'T')))").  The size is estimated with no confidence to be 2 rows.
     The estimated time for this step is 0.01 seconds.
  -> No rows are returned to the user as the result of statement 1.
     The total estimated time is 0.01 seconds.