{"id":148,"date":"2008-11-13T09:53:00","date_gmt":"2008-11-13T11:53:00","guid":{"rendered":"http:\/\/www.soudba.com.br\/?p=148"},"modified":"2008-11-13T09:53:00","modified_gmt":"2008-11-13T11:53:00","slug":"hit-da-instancia","status":"publish","type":"post","link":"https:\/\/www.soudba.com.br\/?p=148","title":{"rendered":"hit da instancia"},"content":{"rendered":"

Atrav\u00e9s de um select simples podemos calcular todos os \u201cHit Ratios\u201d mais importantes de uma instance Oracle. Para simplificar o \u201cHit Ratio\u201d \u00e9 o percentual de acerto em uma certa \u00e1rea da SGA. Por exemplo, 95,3% \u00e9 o \u201cHit Ratios\u201d do Database buffer cache, isso significa que 95,3% dos blocos de dados Oracle procurados est\u00e3o sendo encontrado em mem\u00f3ria.<\/span><\/p>\n

O select :<\/span><\/p>\n

SELECT ‘Library Cache’ Buffer , ROUND(100-SUM(reloads)\/SUM(pins) * 100,2) hit<\/span>
FROM v$librarycache<\/span>
UNION ALL<\/span>
SELECT ‘Dictionary Cache’, 100 – ROUND((SUM(getmisses)\/SUM(gets))*100,2) hit<\/span>
FROM v$rowcache<\/span>
UNION ALL<\/span>
SELECT ‘Buffer Cache’, ROUND((1 – (phy.value \/ (cur.value + con.value)))*100,2) hit<\/span>
FROM v$sysstat cur, v$sysstat con, v$sysstat phy<\/span>
WHERE cur.NAME = ‘db block gets’<\/span>
AND con.NAME = ‘consistent gets’<\/span>
AND phy.NAME = ‘physical reads’<\/span>
UNION ALL<\/span>
SELECT ‘Redo Log Buffer’, ROUND((100-(r.value*100)\/e.value),2) hit<\/span>
FROM v$sysstat r, v$sysstat e<\/span>
WHERE r.NAME = ‘redo buffer allocation retries’<\/span>
AND e.NAME = ‘redo entries’<\/span>
UNION ALL<\/span>
SELECT ‘Sort Area’, ROUND(((100*m.value)\/(d.value + m.value)),2) hit<\/span>
FROM v$statname a, v$sysstat d, v$sysstat m<\/span>
WHERE a.statistic# = d.statistic#<\/span>
AND d.NAME = ‘sorts (disk)’<\/span>
AND m.NAME = ‘sorts (memory)’<\/span><\/span><\/span><\/p>\n

<\/span><\/span>O Resultado gerado no SQL*Plus:<\/span><\/p>\n

\"\"<\/a><\/p>\n

<\/p>\n

fonte: http:\/\/oraclemais.blogspot.com\/<\/p>\n","protected":false},"excerpt":{"rendered":"

Atrav\u00e9s de um select simples podemos calcular todos os \u201cHit Ratios\u201d mais importantes de uma instance Oracle. Para simplificar o \u201cHit Ratio\u201d \u00e9 o percentual de acerto em uma certa \u00e1rea da SGA. Por exemplo, 95,3% \u00e9 o \u201cHit Ratios\u201d … Continue lendo →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,133],"tags":[],"class_list":["post-148","post","type-post","status-publish","format-standard","hentry","category-acertos-na-instancia","category-instancia-hit"],"_links":{"self":[{"href":"https:\/\/www.soudba.com.br\/index.php?rest_route=\/wp\/v2\/posts\/148","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.soudba.com.br\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.soudba.com.br\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.soudba.com.br\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.soudba.com.br\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=148"}],"version-history":[{"count":0,"href":"https:\/\/www.soudba.com.br\/index.php?rest_route=\/wp\/v2\/posts\/148\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.soudba.com.br\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=148"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.soudba.com.br\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=148"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.soudba.com.br\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=148"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}