2026-03-12 20:23:15

tpt/kcbbes.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.
+
+PROMPT List background I/O write priorities and reasons from X$KCBBES...
+PROMPT (X$KCBBES = Kerncel Cache Buffers dB writer Event Statistics)
+
+SELECT
+    indx
+  , CASE indx
+      WHEN 0  THEN 'Invalid Reason'
+      WHEN 1  THEN 'Ping Write'
+      WHEN 2  THEN 'High Prio Thread Ckpt'
+      WHEN 3  THEN 'Instance Recovery Ckpt'
+      WHEN 4  THEN 'Med Prio (incr) Ckpt'
+      WHEN 5  THEN 'Aging Writes'
+      WHEN 6  THEN 'Media Recovery Ckpt'
+      WHEN 7  THEN 'Low Prio Thread Ckpt'
+      WHEN 8  THEN 'Tablespace Ckpt'
+      WHEN 9  THEN 'Reuse Object Ckpt'
+      WHEN 10 THEN 'Reuse Block Range Ckpt'
+      WHEN 11 THEN 'Limit Dirty Buff Ckpt'
+      WHEN 12 THEN 'Smart Scan Ckpt'
+      WHEN 14 THEN 'Direct Path Read Ckpt'
+    END reason_name
+  , reason reason_buffers
+  , ROUND(NULLIF(RATIO_TO_REPORT(reason) OVER () * 100,0), 1) "REASON%"
+  , CASE indx
+      WHEN 0  THEN 'Invalid Priority'
+      WHEN 1  THEN 'High Priority'
+      WHEN 2  THEN 'Medium Priority'
+      WHEN 3  THEN 'Low Priority'
+    END priority_name
+  , priority priority_buffers
+  , ROUND(NULLIF(RATIO_TO_REPORT(priority) OVER () * 100,0), 1) "PRIO%"
+  , CASE indx
+      WHEN 0  THEN 'Queued For Writing'
+      WHEN 1  THEN 'Deferred (log file sync)'
+      WHEN 2  THEN 'Already being written'
+      WHEN 3  THEN 'Buffer not dirty'
+      WHEN 4  THEN 'Buffer is pinned'
+      WHEN 5  THEN 'I/O limit reached'
+      WHEN 6  THEN 'Buffer logically flushed'
+      WHEN 7  THEN 'No free IO slots'
+    END io_proc_status
+  , savecode io_count
+  , ROUND(NULLIF(RATIO_TO_REPORT(savecode) OVER () * 100,0), 1) "STATUS%"
+FROM
+    x$kcbbes
+/