2026-03-12 20:23:15

vdh/offload_percent.sql

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+----------------------------------------------------------------------------------------
+--
+-- File name:   offload_percent.sql
+--
+-- Purpose:     Caclulate % of long running statements that were offloaded. 
+--
+-- Author:      Kerry Osborne
+--
+-- Usage:       This scripts prompts for three values.
+--
+--              sql_text: a piece of a SQL statement like %select col1, col2 from skew%
+--                        The default is to return all statements.
+--
+--              min_etime: the minimum avg. elapsed time in seconds
+--                         This parameter allows limiting the output to long running statements.
+--                         The default is 0 which returns all statements.
+--
+--              min_avg_lio: the minimum avg. elapsed time in seconds
+--                           This parameter allows limiting the output to long running statements.
+--                           The default is 500,000.
+--
+-- Description:
+--
+--              This script can be used to provide a quick check on whether statements 
+--              are being offloaded or not on Exadata platforms.
+--
+--              It is based on the observation that the IO_CELL_OFFLOAD_ELIGIBLE_BYTES
+--              column in V$SQL is only greater than 0 when a statement is executed
+--              using a Smart Scan. 
+--
+--              The default values will aggregate data for all statements that have an
+--              avg_lio value of greater than 500,000. You can change this minimum value
+--              or further limit the set of statements that will be evaluated by providing
+--              a piece of SQL text, 'select%' for example, or setting a minimum avg. 
+--              elapsed time value. 
+--
+--              See kerryosborne.oracle-guy.com for additional information.
+---------------------------------------------------------------------------------------
+set pagesize 999
+set lines 190
+col sql_text format a70 trunc
+col child format 99999
+col execs format 9,999
+col avg_etime format 99,999.99
+col "OFFLOADED_%" format a11
+col avg_px format 999
+col offload for a7
+
+select 
+offloaded+not_offloaded total, offloaded, 
+lpad(to_char(round(100*offloaded/ (offloaded+not_offloaded),2))||'%',11,' ') "OFFLOADED_%" 
+from (
+select sum(decode(offload,'Yes',1,0)) offloaded, 
+       sum(decode(offload,'No',1,0)) not_offloaded
+from (
+select * from (
+select sql_id, child_number child, plan_hash_value plan_hash, executions execs, 
+(elapsed_time/1000000)/decode(nvl(executions,0),0,1,executions)/
+decode(px_servers_executions,0,1,px_servers_executions/decode(nvl(executions,0),0,1,executions)) avg_etime, 
+px_servers_executions/decode(nvl(executions,0),0,1,executions) avg_px,
+decode(IO_CELL_OFFLOAD_ELIGIBLE_BYTES,0,'No','Yes') Offload,
+decode(IO_CELL_OFFLOAD_ELIGIBLE_BYTES,0,0,100*(IO_CELL_OFFLOAD_ELIGIBLE_BYTES-IO_INTERCONNECT_BYTES)
+/decode(IO_CELL_OFFLOAD_ELIGIBLE_BYTES,0,1,IO_CELL_OFFLOAD_ELIGIBLE_BYTES)) "IO_SAVED_%",
+-- buffer_gets lio,
+buffer_gets/decode(nvl(executions,0),0,1,executions) avg_lio,
+sql_text
+from v$sql s
+where upper(sql_text) like upper(nvl('&sql_text',sql_text))
+and sql_text not like 'BEGIN :sql_text := %'
+and sql_text not like '%IO_CELL_OFFLOAD_ELIGIBLE_BYTES%')
+where avg_etime > nvl('&min_etime','0')
+)
+where avg_lio > nvl('&min_avg_lio','500000')
+)
+/