2026-03-12 20:23:15

tpt/i2h.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:   i2h.sql  (sql Id to Hash value)
+--
+-- Purpose:     Advanced Oracle Troubleshooting Seminar demo script
+--              to show that SQL_ID is just a fancy representation of a hash value
+--              of a library cache object name.
+--
+--              Converts SQL_ID to HASH_VALUE
+--
+-- Usage:       @i2h <sqlid>
+--             
+--
+-- Author:      Tanel Poder ( http://www.tanelpoder.com )
+--
+-- Copyright:   (c) 2007-2009 Tanel Poder
+--
+--------------------------------------------------------------------------------
+select
+    trunc(mod(sum((
+        instr('0123456789abcdfghjkmnpqrstuvwxyz',substr(lower(trim('&1')),level,1))-1)*power(32,length(trim('&1'))-level)),power(2,32))) hash_value
+    , lower(trim('&1')) sql_id
+from
+    dual
+connect by
+    level <= length(trim('&1'))
+/