2026-03-12 20:23:15

tpt/aot/demo2a.sql

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+-- Copyright 2018 Tanel Poder. All rights reserved. More info at http://tanelpoder.com
+-- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
+
+--------------------------------------------------------------------------------
+--
+-- File name:   demo2a.sql
+--
+-- Purpose:     Advanced Oracle Troubleshooting Seminar demo script
+--              Will cause some recursive dynamic sampling activity
+--              that does not show up in V$SESSION and ASH
+--
+--              Uses SwingBench Order Entry schema table (but you can use
+--              any other large table for testing this effect).
+--
+--              Requires Oracle 11.2 or lower (12c works slightly differently)
+--
+-- Author:      Tanel Poder ( http://tanelpoder.com )
+-- Copyright:   (c) Tanel Poder
+--
+--------------------------------------------------------------------------------
+
+prompt Starting Demo2a...
+
+set echo on
+
+ALTER SYSTEM FLUSH SHARED_POOL;
+
+SELECT /*+ DYNAMIC_SAMPLING(o 10) */ * FROM soe.order_items o WHERE order_id = 1;
+SELECT /*+ DYNAMIC_SAMPLING(o 10) */ * FROM soe.order_items o WHERE order_id = 1;
+SELECT /*+ DYNAMIC_SAMPLING(o 10) */ * FROM soe.order_items o WHERE order_id = 1;
+
+ALTER SYSTEM FLUSH SHARED_POOL;
+
+SELECT /*+ DYNAMIC_SAMPLING(o 10) */ * FROM soe.order_items o WHERE order_id = 1;
+SELECT /*+ DYNAMIC_SAMPLING(o 10) */ * FROM soe.order_items o WHERE order_id = 1;
+SELECT /*+ DYNAMIC_SAMPLING(o 10) */ * FROM soe.order_items o WHERE order_id = 1;
+
+set echo off
+