2026-03-12 20:23:15

vdh/db_cache_advice.sql

@@ -0,0 +1,63 @@
+set linesize 250
+set pages 50000
+
+column block_size format a10 heading "Block Size"
+column instance format a15 heading "Instance"
+column size_for_estimate format 9G999G990D99 heading "Cache Size (MB)"
+column estd_physical_read_factor format 990D999 heading "Factor"
+column estd_physical_reads format 99G999G999G999G990 heading "Est Phys Reads"
+column estd_phys_reads_delta format 999G999G999G990 heading "Est Phys Reads Del"
+column estd_cluster_reads format 99G999G999G999G990 heading "Est Clust Reads"
+column estd_cls_reads_delta format 999G999G999G990 heading "Est Clust Reads Del"
+column estd_physical_read_time format 9G999G999G990 heading "Est Phys Read Time"
+column estd_phys_read_time_delta format 9G999G999G990 heading "Est Phys Read Time Del"
+column estd_pct_of_db_time_for_reads format 9990D99 heading "Est % read"
+column estd_cluster_read_time format 9G999G999G990 heading "Est Clust Read Time"
+column estd_cls_read_time_delta format 9G999G999G990 heading "Est Clust Read Time Del"
+
+break on name skip 2 on block_size on instance skip 1
+
+with current_size as
+( select
+    inst_id,
+    block_size,
+    estd_physical_reads,
+    estd_physical_read_time,
+    estd_cluster_reads,
+    estd_cluster_read_time
+  from
+    gv$db_cache_advice
+  where
+    advice_status = 'ON'
+    and estd_physical_read_factor = 1
+)
+select
+  ca.block_size || decode(name, 'DEFAULT', ' (*)') block_size,
+  ca.inst_id || ' (' || to_char(inst.startup_time, 'DD/MM/YYYY') || ')'   instance, 
+  ca.size_for_estimate, 
+  ca.estd_physical_read_factor, 
+  ca.estd_pct_of_db_time_for_reads,
+  ca.estd_physical_reads,
+  (ca.estd_physical_reads - cs.estd_physical_reads) estd_phys_reads_delta,
+  ca.estd_physical_read_time,
+  ( ca.estd_physical_read_time - cs.estd_physical_read_time) estd_phys_read_time_delta,
+  ca.estd_cluster_reads,
+  (ca.estd_cluster_reads - cs.estd_cluster_reads) estd_cls_reads_delta,
+  ca.estd_cluster_read_time,
+  ( ca.estd_cluster_read_time - cs.estd_cluster_read_time) estd_cls_read_time_delta
+from
+  gv$db_cache_advice  ca,
+  current_size        cs,
+  gv$instance         inst
+where
+  ca.block_size = cs.block_size
+  and ca.inst_id = cs.inst_id
+  and inst.inst_id = ca.inst_id
+  and ca.advice_status = 'ON'
+order by
+  ca.block_size,
+  ca.inst_id,
+  ca.size_for_estimate
+;
+
+clear breaks