Transform a temporary table. The temporary table is generated by a recursive statement
Note that this operation does NOT appear in V$SQL_PLAN
This operation was introduced in Oracle 9.0.1
This operation is implemented in the following versions
This example was developed using Oracle 188.8.131.52 on Windows 2000
This example requires the following table definition
CREATE TABLE t1 (c1 NUMBER,c2 NUMBER);
The table does not need to be analysed
Consider the statement
SELECT c1,c2,COUNT(*) FROM t1 GROUP BY GROUPING SETS (c1,c2);
In Oracle 9.2 this statement generates the following execution plan
0 SELECT STATEMENT Optimizer=CHOOSE 1 4 RECURSIVE EXECUTION OF 'SYS_LE_4_0' 2 4 RECURSIVE EXECUTION OF 'SYS_LE_4_1' 3 4 RECURSIVE EXECUTION OF 'SYS_LE_4_2' 4 0 TEMP TABLE TRANSFORMATION 5 4 VIEW 6 5 TABLE ACCESS (FULL) OF 'SYS_TEMP_1_0_FD9D6603'
In Oracle 10.2 this statement generates the following execution plan
0 SELECT STATEMENT Optimizer=CHOOSE 1 0 TEMP TABLE TRANSFORMATION 2 1 LOAD AS SELECT 3 2 TABLE ACCESS (FULL) OF 'T1' 4 1 LOAD AS SELECT 5 4 HASH GROUP BY 6 5 TABLE ACCESS (FULL) OF 'SYS_TEMP_OFD9D6602_6718F7' 7 1 LOAD AS SELECT 8 7 HASH GROUP BY 9 8 TABLE ACCESS (FULL) OF 'SYS_TEMP_0FD9D6602_6718F7' 10 1 VIEW 11 10 TABLE ACCESS (FULL) OF 'SYS_TEMP_0FD9D6602_6718F7'