2026-03-12 20:23:15
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idev/perf_performance_snapshot.sql
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idev/perf_performance_snapshot.sql
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-- +----------------------------------------------------------------------------+
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-- | Jeffrey M. Hunter |
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-- | jhunter@idevelopment.info |
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-- | www.idevelopment.info |
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-- |----------------------------------------------------------------------------|
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-- | Copyright (c) 1998-2011 Jeffrey M. Hunter. All rights reserved. |
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-- |----------------------------------------------------------------------------|
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-- | DATABASE : Oracle |
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-- | FILE : perf_performance_snapshot.sql |
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-- | CLASS : Tuning |
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-- | PURPOSE : This script will generate a small performance overview report |
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-- | checking all key database performance indicators. |
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-- | NOTE : As with any code, ensure to test this script in a development |
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-- | environment before attempting to run it in production. |
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-- +----------------------------------------------------------------------------+
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SET LINESIZE 145
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SET PAGESIZE 9999
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SET VERIFY off
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PROMPT
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PROMPT +-----------------------------------+
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PROMPT | Database Startup Date/Time |
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PROMPT +-----------------------------------+
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PROMPT
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SELECT
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instance "Instance Name"
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, open_time "Open Date/Time"
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FROM
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v$thread
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/
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PROMPT
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PROMPT +-----------------------------------+
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PROMPT | Buffer Cache Hit Ratio |
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PROMPT +-----------------------------------+
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PROMPT
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SELECT
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TRUNC( ( 1 - ( SUM(decode(name,'physical reads',value,0)) /
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( SUM(DECODE(name,'db block gets',value,0))
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+
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(SUM(DECODE(name,'consistent gets',value,0)))
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)
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)
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) * 100
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) "Buffer Hit Ratio"
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FROM v$sysstat
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/
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SELECT
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a.value + b.value "Logical reads"
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, c.value "Physical Reads"
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, d.value "Physical Writes"
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, ROUND (100 * ( (a.value+b.value)-c.value) / (a.value+b.value)
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) "Buffer Hit Ratio"
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, ROUND(c.value * 100 / (a.value + b.value)) "% Missed"
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FROM
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v$sysstat a
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, v$sysstat b
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, v$sysstat c
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, v$sysstat d
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WHERE
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a.statistic#=37
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AND b.statistic#=38
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AND c.statistic#=39
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AND d.statistic#=40
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/
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PROMPT
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PROMPT +-----------------------------------+
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PROMPT | Data Dictionary Hit Ratio |
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PROMPT +-----------------------------------+
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PROMPT
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SELECT
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SUM(gets) "Data Dict. Gets"
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, SUM(getmisses) "Data Dict. Cache Misses"
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, ROUND((1-(sum(getmisses)/SUM(gets)))*100) "Data Dict Cache Hit Ratio"
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, ROUND(SUM(getmisses)*100/SUM(gets)) "% Missed"
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FROM
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v$rowcache
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/
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PROMPT
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PROMPT +-----------------------------------+
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PROMPT | Library Cache Miss Ratio |
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PROMPT +-----------------------------------+
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PROMPT
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SELECT
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SUM(pins) "Executions"
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, SUM(reloads) "Cache Misses"
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, ROUND((1-(SUM(reloads)/SUM(pins)))*100) "Library Cache Hit Ratio"
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, ROUND(SUM(reloads)*100/SUM(pins)) "% Missed"
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FROM
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v$librarycache
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/
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SELECT
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namespace "Namespace"
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, TRUNC(gethitratio*100) "Hit Ratio"
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, TRUNC(pinhitratio*100) "Pin Hit Ratio"
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, reloads "Reloads"
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, invalidations "Invalidations"
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FROM
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v$librarycache
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/
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PROMPT
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PROMPT +-----------------------------------+
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PROMPT | Redo Log Buffer |
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PROMPT +-----------------------------------+
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PROMPT
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SELECT
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SUBSTR(name,1,30) "Name"
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, TO_CHAR(value, '999,999') "Bytes"
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FROM
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v$sysstat
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WHERE
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name ='redo log space requests'
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/
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SELECT
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name "Name"
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, TO_CHAR(bytes, '999,999,999,999') "Bytes"
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FROM
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v$sgastat
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WHERE
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name ='free memory'
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/
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SELECT
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TO_CHAR(SUM(executions), '999,999,999,999,999,999') "Tot SQL since startup"
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, TO_CHAR(SUM(users_executing), '999,999,999,999,999') "SQL executing now"
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FROM
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v$sqlarea
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/
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PROMPT
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PROMPT +--------------------------------------------------------+
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PROMPT | If miss_ratio or immediate_miss_ratio > 1 then latch |
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PROMPT | contention exists, decrease LOG_SMALL_ENTRY_MAX_SIZE |
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PROMPT +--------------------------------------------------------+
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PROMPT
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SELECT
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SUBSTR(ln.name,1,30) "Name"
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, (misses/(gets+.001)) * 100 "Miss Ratio"
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, (immediate_misses/(immediate_gets+.001)) * 100 "Immd. Miss Ratio"
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FROM
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v$latch l
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, v$latchname ln
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WHERE
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l.latch# = ln.latch#
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AND ( (( misses / (gets+.001)) * 100 > .1 )
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OR
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(( immediate_misses / (immediate_gets+.001)) * 100 > .1)
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)
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ORDER BY
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ln.name
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/
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PROMPT
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PROMPT +--------------------------------------------------------+
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PROMPT | If these are < 1% of Total Number of requests for data |
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PROMPT | then extra rollback segments are needed. |
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PROMPT +--------------------------------------------------------+
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PROMPT
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SELECT
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class "Class"
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, count "Count"
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FROM
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v$waitstat
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WHERE
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class IN ( 'free list'
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, 'system undo header'
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, 'system undo block'
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, 'undo header'
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, 'undo block')
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GROUP BY
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class
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, count
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/
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PROMPT
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PROMPT +-----------------------------------+
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PROMPT | Total Number of Requests for Data |
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PROMPT +-----------------------------------+
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PROMPT
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SELECT TO_CHAR(SUM(value), '999,999,999,999,999') "Total Requests"
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FROM v$sysstat
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WHERE name IN ('db block gets','consistent gets')
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/
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