2026-03-12 20:23:15

tpt/xm.sql

@@ -0,0 +1,90 @@
+-- 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:   xm.sql (eXplain from Memory)
+--
+-- Purpose:     Explain a SQL statements execution plan directly from library cache
+--
+-- Author:      Tanel Poder
+-- Copyright:   (c) http://www.tanelpoder.com
+--              
+-- Usage:       Identify the hash value and and child cursor number for the query 
+--              you want to explain (either from v$session.sql_hash_value or by
+--              searching through v$sql.sql_text
+--
+--              Then run:
+--                @xm <hash_value> <child_number>
+--
+--              For example:
+--                @xm 593239587 0      -- this would show plan for child 0 of cursor
+--                                     -- with hash value 593239587
+--
+--                @xm 593239587 %      -- this would show all child cursors for the SQL
+--          
+--------------------------------------------------------------------------------
+
+column xms_child_number heading Ch|ld format 9 print
+column xms_id       heading Op|ID format 999
+column xms_id2      heading Op|ID format a6
+column xms_pred     heading Pr|ed format a2
+column xms_optimizer    heading Optimizer|Mode format a10
+column xms_plan_step    heading Operation for a55
+column xms_object_name  heading Objcect|Name for a30
+column xms_opt_cost heading Optimizer|Cost for 9999999
+column xms_opt_card heading "Optim rows|from step" for 999999999
+column xms_opt_bytes    heading "Optim bytes|from step" for 999999999
+column xms_predicate_info heading "Predicate Information (identified by operation id):" format a100 word_wrap
+
+break on xms_child_number skip 1
+
+select 
+        child_number    xms_child_number,
+    case when access_predicates is not null then 'A' else ' ' end ||
+    case when filter_predicates is not null then 'F' else ' ' end xms_pred,
+    id      xms_id,
+    lpad(' ',depth*1,' ')||operation || ' ' || options xms_plan_step, 
+    object_name     xms_object_name,
+--  search_columns,
+    cost        xms_opt_cost,
+    cardinality xms_opt_card,
+    bytes       xms_opt_bytes,
+    optimizer   xms_optimizer
+--  other_tag,
+--  other,
+--  distribution,
+--  access_predicates,
+--  filter_predicates
+from 
+    v$sql_plan 
+where 
+    hash_value in (&1)
+and to_char(child_number) like '&2'  -- to_char is just used for convenient filtering using % for all children
+/
+
+select * from (
+select
+        child_number    xms_child_number,
+    lpad(id, 5, ' ') xms_id2,
+    ' - access('|| substr(access_predicates,1,3989) || ')' xms_predicate_info
+from
+    v$sql_plan
+where
+    hash_value in (&1)
+and to_char(child_number) like '&2'
+and access_predicates is not null
+union all
+select
+        child_number,
+    lpad(id, 5, ' ') xms_id2,
+    ' - filter('|| substr(filter_predicates,1,3989) || ')' xms_predicate_info
+from
+    v$sql_plan
+where
+    hash_value in (&1)
+and to_char(child_number) like '&2'
+and filter_predicates is not null
+)
+order by xms_child_number, xms_id2
+/