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Chapter 18 Setting Up and Monitoring Performance Statistics and Resource Maps

Using Collection Levels Effectively

 Toretrievemoredetailedmetricsforashortperiodoftime,viewareal‐timedata

chartratherthanincreasethecollectionlevel.Viewingreal‐timedatahasless

impactonperformancebecausemetricsareretrieveddirectlyfromthesource

withoutbeingwrittentotheVirtualCenterdatabase.Formoreinformationon

data

charts,see“PerformanceCharts”onpage 289.

 Whenyouusecollectionlevel3or4todiagnoseproblems,resetthecollectionlevel

toitspreviousstateassoonaspossible.

 Whenyouusecollectionlevel4,trytolimitthecollectionperiodtotheDay

intervalsothedatabaseisn’timpacted.Ifyouneedtosavethedataforlongerthan

1day,increasetheDayintervaldurationto2or3ratherthanusetheWeek

interval.Forexample,

ifyouneedtorecorddataovertheweekend,settheinterval

to3days.Asarule,increasethecollectionintervaltotheWeekintervalonlywhen

youneedtheintervaldurationtobemorethan3days.

How statistical data is stored in the database

Thestatisticaldataforeachcollectionintervalisstoredinitsowndatabasetable.Atthe

endofaninterval,oneoftwothingscanoccur:

 Ifthenextintervalisdisabled,thedatainthetablethatisolderthantheinterval

durationispurged.

 Ifthenextintervalisenabled,thedataisaggregatedintogroupsandisrolledupto

thedatabasetableofthesubsequentcollectioninterval.Forexample,saytheDay

intervalhasa5minutecollectionfrequencyandtheWeekintervalhasa30minute

collectionfrequency.WhentheDay

intervalcompletes,itaggregatesthe5minute

queriesintogroupsof6(equalling30minutes)androllsthe30minutedatablock

totheWeekintervaldatabasetable.Theday‐olddataisthenpurgedfromthe

databasetomakeroomfornewqueries.Figure 18‐1,“Example:DailyStatistics

Collection,”on

page 282showsthedefaultrollupprocess.

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ESX QE450.2 Especificaciones Pagina 285