2026-03-12 20:23:15

tpt/hash.sql

@@ -0,0 +1,42 @@
+-- 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:   hash.sql
+-- Purpose:     Show the hash value, SQL_ID and child number of previously
+--              executed SQL in session
+--
+-- Author:      Tanel Poder
+-- Copyright:   (c) http://www.tanelpoder.com
+--              
+-- Usage:       @hash
+-- 	        
+--	        
+-- Other:       Doesn't work on 9i for 2 reasons. There appears to be a bug
+--              with v$session.prev_hash_value in 9.2.x and also there's no
+--              SQL_ID nor CHILD_NUMBER column in V$SESSION in 9i.
+--
+--------------------------------------------------------------------------------
+
+col hash_hex for a10
+
+select 
+    ses.prev_hash_value                                hash_value
+  , ses.prev_sql_id                                    sql_id
+  , ses.prev_child_number                              child_number
+  , MOD(ses.prev_hash_value, 131072)                   kgl_bucket
+  , (select sql.plan_hash_value 
+     from v$sql sql 
+     where 
+         sql.sql_id = ses.prev_sql_id 
+     and sql.child_number = ses.prev_child_number
+     and sql.address = ses.prev_sql_addr)        plan_hash_value
+  --, lower(to_char(ses.prev_hash_value, 'XXXXXXXX'))    hash_hex
+  , ses.prev_exec_start                                sql_exec_start
+  , ses.prev_exec_id                                   sql_exec_id
+from 
+    v$session ses
+where 
+    ses.sid = userenv('sid')
+/