2026-03-12 21:01:38

reverse_index/c_reverse_ind3_02.sql

@@ -0,0 +1,56 @@
+rem     https://jonathanlewis.wordpress.com/2015/06/17/reverse-key-2/
+
+rem     Script:         c_reverse_ind3.sql
+rem     Author:         Jonathan Lewis
+rem     Dated:          Jun 2010
+rem     Purpose:
+rem
+ 
+drop table t1 purge;
+
+create table t1(
+        id      not null
+)
+nologging
+as
+with generator as (
+        select  --+ materialize
+                rownum id 
+        from dual 
+        connect by 
+                rownum <= 1e4 -- > comment to avoid wordpress format issue
+)
+select
+        1e7 + rownum    id
+from
+        generator       v1,
+        generator       v2
+where
+        rownum <= 1e7 -- > comment to avoid WordPress format issue
+;
+ 
+begin
+        dbms_stats.gather_table_stats(
+                ownname          => user,
+                tabname          => 'T1'
+        );
+end;
+/
+ 
+alter table t1 add constraint t1_pk primary key(id) 
+using index 
+        -- reverse 
+        nologging 
+;
+
+alter system flush shared_pool; 
+alter system flush buffer_cache;
+
+alter session set events '10046 trace name context forever, level 8';
+ 
+begin
+        for i in 20000001..20010000 loop
+                insert into t1 values(i);
+        end loop;
+end;
+/