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