2026-03-12 20:23:15

tpt/bhla.sql

@@ -0,0 +1,49 @@
+-- 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:   bhla.sql (Buffer Headers by Latch Address)
+-- Purpose:     Report which blocks are in buffer cache, protected by a cache
+--              buffers chains child latch
+--
+-- Author:      Tanel Poder
+-- Copyright:   (c) http://www.tanelpoder.com
+--              
+-- Usage:       @bhla <child latch address>
+--              @bhla 27E5A780
+-- 	        
+--	        
+-- Other:       This script reports all buffers "under" the given cache buffers
+--              chains child latch, their corresponding segment names and
+--              touch counts (TCH).
+--
+--------------------------------------------------------------------------------
+
+col bhla_object head object for a40 truncate
+col bhla_DBA head DBA for a20
+col bhla_obj head OBJ for 99999999999
+
+WITH bclass AS (SELECT class, ROWNUM id from v$waitstat)
+select  /*+ LEADING(bh) */
+	bh.obj bhla_obj,
+	o.object_type,
+	o.owner||'.'||o.object_name		bhla_object,
+  bclass.class,
+	bh.tch,
+	file# ||' '||dbablk			bhla_DBA,
+	bh.state,
+	bh.mode_held,
+	bh.dirty_queue				DQ,
+	trim(to_char(bh.flag, 'XXXXXXXX'))	||':'||trim(to_char(bh.lru_flag, 'XXXXXXXX')) flg_lruflg
+from
+	x$bh		bh,
+	dba_objects	o,
+  bclass
+where
+	  bh.obj = o.data_object_id
+and bh.class = bclass.id (+)
+and	hladdr = hextoraw(lpad('&1', vsize(hladdr)*2 , '0'))
+order by
+	tch desc
+/