2026-03-12 20:23:15

tpt/sqlmemh.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.
+
+prompt Show shared pool memory usage of SQL statement with hash value &1
+
+-- uncomment the chunk_ptr and/or subheap_desc if you want more detailed breakdown of individual chunk allocations
+
+COL sqlmem_structure HEAD STRUCTURE FOR A20
+COL sqlmem_function  HEAD FUNCTION  FOR A20
+COL sqlmem_chunk_com HEAD CHUNK_COM FOR A20
+COL sqlmem_heap_desc HEAD HEAP_ADDR FOR A16
+
+
+SELECT
+    child_number
+  , sharable_mem
+  , persistent_mem
+  , runtime_mem
+--  , typecheck_mem
+FROM
+    v$sql
+WHERE
+    hash_value = &1
+/
+
+-- the hints below are needed on oracle 12 as the CBO ended up
+-- changing ignoring the join order specified in the GV$ view hints
+
+SELECT /*+ NO_MERGE(@sel$2) NO_MERGE(@sel$3) LEADING(@sel$3 c) */
+--    sql_text
+--  , sql_fulltext
+--    hash_value
+--  , sql_id
+    sum(chunk_size) total_size
+  , trunc(avg(chunk_size)) avg_size
+  , count(*) chunks
+  , alloc_class
+  , chunk_type
+  , structure     sqlmem_structure
+  , function      sqlmem_function
+  , chunk_com     sqlmem_chunk_com
+  , heap_desc     sqlmem_heap_desc
+--  , chunk_ptr
+--  , subheap_desc
+FROM
+    v$sql_shared_memory s
+WHERE    
+    hash_value = &1
+GROUP BY
+--    hash_value
+--  , sql_id
+   heap_desc
+  , structure
+  , function
+  , chunk_com
+--  , chunk_ptr
+  , alloc_class
+  , chunk_type
+--  , subheap_desc
+ORDER BY
+    total_size DESC
+/
+