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