2026-03-12 20:23:15

tpt/demos/create_wide_table.sql

@@ -0,0 +1,27 @@
+-- Copyright 2020 Tanel Poder. All rights reserved. More info at https://tanelpoder.com
+-- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
+
+DECLARE
+    cmd CLOB := 'CREATE TABLE widetable ( id NUMBER PRIMARY KEY ';
+    ins CLOB := 'INSERT INTO widetable SELECT rownum';
+BEGIN
+    FOR x IN 1..999 LOOP
+        cmd := cmd || ', col'||TRIM(TO_CHAR(x))||' VARCHAR2(10)';
+        ins := ins || ', TRIM(TO_CHAR(rownum))';
+    END LOOP;
+    cmd := cmd || ')';
+    ins := ins || ' FROM dual CONNECT BY level <= 100';
+    EXECUTE IMMEDIATE cmd;
+    EXECUTE IMMEDIATE ins;
+END;
+/
+
+COMMIT;
+
+-- stats with histograms
+EXEC DBMS_STATS.GATHER_TABLE_STATS(user,'WIDETABLE',method_opt=>'FOR TABLE, FOR ALL COLUMNS SIZE 254');
+
+-- no histograms
+-- EXEC DBMS_STATS.GATHER_TABLE_STATS(user,'WIDETABLE',method_opt=>'FOR TABLE, FOR ALL COLUMNS SIZE 1');
+
+-- EXEC sys.dbms_shared_pool.purge('SYSTEM', 'WIDETABLE', 1, 1);