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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.
--------------------------------------------------------------------------------
--
-- File name: xmsh (eXplain from Memory with Statistics lookup by Hash value)
--
-- Purpose: Explain a SQL statements execution plan with execution
-- profile directly from library cache
--
-- Author: Tanel Poder
-- Copyright: (c) http://www.tanelpoder.com
--
-- Usage: 1) alter session set statistics_level = all;
-- 2) Run the statement you want to explain
-- 3) @xmsh <hash_value> <child#>
--
-- Other: You can add a GATHER_PLAN_STATISTICS hint to the statement instead
-- if you dont want to use "alter session set statistics_level"
-- for some reason (this hint works on Oracle 10.2 and higher)
--
--------------------------------------------------------------------------------
set verify off heading off feedback off linesize 299 pagesize 5000 tab off
column xms_child_number heading "Ch|ld" format 99
break on xms_child_number skip 1
column xms_id heading Op|ID format 999
column xms_id2 heading Op|ID format a6
column xms_pred heading Pr|ed format a2
column xms_optimizer heading Optimizer|Mode format a10
column xms_plan_step heading Operation for a55
column xms_object_name heading Object|Name for a30
column xms_opt_cost heading Optimizer|Cost for 99999999999
column xms_opt_card heading "Estimated|output rows" for 999999999999
column xms_opt_bytes heading "Estimated|output bytes" for 999999999999
column xms_predicate_info heading "Predicate Information (identified by operation id):" format a100 word_wrap
column xms_cpu_cost heading CPU|Cost for 9999999
column xms_io_cost heading IO|Cost for 9999999
column xms_last_output_rows heading "Real #rows|returned" for 999999999
column xms_last_starts heading "Rowsource|starts" for 999999999
column xms_last_cr_buffer_gets heading "Consistent|gets" for 999999999
column xms_last_cu_buffer_gets heading "Current|gets" for 999999999
column xms_last_disk_reads heading "Physical|reads" for 999999999
column xms_last_disk_writes heading "Physical|writes" for 999999999
column xms_last_elapsed_time_ms heading "ms spent in|operation" for 9,999,999.99
--select
-- 'Warning: statistics_level is not set to ALL!'||chr(10)||
-- 'Run: alter session set statistics_level=all before executing your query...' warning
--from
-- v$parameter
--where
-- name = 'statistics_level'
--and lower(value) != 'all'
--/
select --+ ordered use_nl(mys ses) use_nl(mys sql)
'SQL hash value: ' xms_sql_hash_value_text,
sql.hash_value xms_hash_value,
' Cursor address: ' xms_cursor_address_text,
sql.address xms_sql_address,
' | Statement first parsed at: '|| sql.first_load_time ||' | '||
round( (sysdate - to_date(sql.first_load_time,'YYYY-MM-DD/HH24:MI:SS'))*86400 ) || ' seconds ago' xms_seconds_ago
from
v$sql sql,
all_users usr
where
sql.parsing_user_id = usr.user_id
and sql.hash_value in (&1)
--and sql.hash_value = &1
and to_char(sql.child_number) like '&2'
order by
sql.hash_value asc,
sql.child_number asc
/
set heading on
select --+ ordered use_nl(p ps)
p.child_number xms_child_number,
case when p.access_predicates is not null then 'A' else ' ' end ||
case when p.filter_predicates is not null then 'F' else ' ' end xms_pred,
p.id xms_id,
lpad(' ',p.depth*1,' ')|| p.operation || ' ' || p.options xms_plan_step,
p.object_name xms_object_name,
-- p.search_columns,
-- p.optimizer xms_optimizer,
round(ps.last_elapsed_time/1000,2)
xms_last_elapsed_time_ms,
p.cardinality xms_opt_card,
ps.last_output_rows xms_last_output_rows,
ps.last_starts xms_last_starts,
ps.last_cr_buffer_gets xms_last_cr_buffer_gets,
ps.last_cu_buffer_gets xms_last_cu_buffer_gets,
ps.last_disk_reads xms_last_disk_reads,
ps.last_disk_writes xms_last_disk_writes,
p.cost xms_opt_cost
-- p.bytes xms_opt_bytes,
-- p.cpu_cost xms_cpu_cost,
-- p.io_cost xms_io_cost,
-- p.other_tag,
-- p.other,
-- p.distribution,
-- p.access_predicates,
-- p.filter_predicates,
from
v$sql_plan p,
v$sql_plan_statistics ps
where
p.address = ps.address(+)
and p.hash_value = ps.hash_value(+)
and p.child_number = ps.child_number(+)
and p.id = ps.operation_id(+)
and p.hash_value in (&1)
--and p.hash_value = &1
and to_char(p.child_number) like '&2' -- to_char is just used for convenient filtering using % for all children
order by
p.hash_value asc,
p.address asc,
p.child_number asc,
p.id asc
/
prompt
select
xms_child_number,
xms_id2,
xms_predicate_info
from (
select
hash_value xms_hash_value,
child_number xms_child_number,
lpad(id, 5, ' ') xms_id2,
' - access('|| substr(access_predicates,1,3980) || ')' xms_predicate_info
from
v$sql_plan
where
hash_value in (&1)
and to_char(child_number) like '&2'
and access_predicates is not null
union all
select
hash_value xms_hash_value,
child_number xms_child_number,
lpad(id, 5, ' ') xms_id2,
' - filter('|| substr(filter_predicates,1,3980) || ')' xms_predicate_info
from
v$sql_plan
where
hash_value in (&1)
-- hash_value = &1
and to_char(child_number) like '&2'
and filter_predicates is not null
)
order by
xms_hash_value asc,
xms_child_number asc,
xms_id2 asc,
xms_predicate_info asc
/
prompt
set feedback on