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BerkeleyDBorarespecificallytoldtodosobyRedHatsupport.
Parameter
Description
EntryDN
cn=config,cn=ldbmdatabase,cn=plugins,
cn=config
ValidRange
0to2^31-1
DefaultValue
0
Syntax
Integer
Example
nsslapd-db-spin-count:0
4.1.17.nsslapd-db-transaction-batch-val
Thisattributespecifieshowmanytransactionswillbebatchedbeforebeingcommitted.This
attributecanimproveupdateperformancewhenfulltransactiondurabilityisnotrequired.This
attributecanbedynamicallymodifiedusing
ldapmodify
.Forfurtherinformationonmodifying
thisattribute,refertothe"TuningDirectoryServerPerformance"chapterintheDirectoryServer
AdministrationGuide.
WARNING
Settingthisvaluewillreducedataconsistencyandmayleadtolossofdata.This
isbecauseifthereisapoweroutagebeforetheservercanflushthebatched
transactions,thosetransactionsinthebatchwillbelost.
DonotsetthisvalueunlessspecificallyrequestedtodosobyRedHatsupport.
Ifthisattributeisnotdefinedorissettoavalueof
0
,transactionbatchingwillbeturnedoff,and
itwillbeimpossibletomakeremotemodificationstothisattributeviaLDAP.However,setting
thisattributetoavaluegreaterthan
0
causestheservertodelaycommittingtransactionsuntil
thenumberofqueuedtransactionsisequaltotheattributevalue.Avaluegreaterthan
0
also
allowsmodifificationstothisattributeremotelyviaLDAP.Avalueof
1
forthisattributeallows
modificationstotheattributesettingremotelyviaLDAP,butresultsinnobatchingbehavior.A
valueof
1
atserverstartupisthereforeusefulformaintainingnormaldurabilitywhilealso
allowingtransactionbatchingtobeturnedonandoffremotelywhendesired.Rememberthat
thevalueforthisattributemayrequiremodifyingthe
nsslapd-db-logbuf-size
attributeto
ensuresufficientlogbuffersizeforaccommodatingthebatchedtransactions.
DatabaseAttributesundercn=config,
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NOTE
The
nsslapd-db-transaction-batch-val
attributeisonlyvalidifthe
nsslapd-db-durable-transaction
attributeissetto
on
.
Formoreinformationondatabasetransactionlogging,refertothe"MonitoringServerand
DatabaseActivity"chapterintheDirectoryServerAdministrationGuide.
Parameter
Description
EntryDN
cn=config,cn=ldbmdatabase,cn=plugins,
cn=config
ValidRange
0to30
DefaultValue
0(orturnedoff)
Syntax
Integer
Example
nsslapd-db-transaction-batch-val:5
4.1.18.nsslapd-db-trickle-percentage
Thisattributesetsthatatleastthespecifiedpercentageofpagesintheshared-memorypool
arecleanbywritingdirtypagestotheirbackingfiles.Thisistoensurethatapageisalways
availableforreadinginnewinformationwithouthavingtowaitforawrite.
Parameter
Description
EntryDN
cn=config,cn=ldbmdatabase,cn=plugins,
cn=config
ValidRange
0to100
DefaultValue
40
Syntax
Integer
Example
nsslapd-db-trickle-percentage:40
4.1.19.nsslapd-db-verbose
Thisattributespecifieswhethertorecordadditionalinformationalanddebuggingmessages
whensearchingthelogforcheckpoints,doingdeadlockdetection,andperformingrecovery.
Thisparameterismeantfortroubleshooting,andenablingtheparametermayslowdownthe
DirectoryServer.
Parameter
Description
EntryDN
cn=config,cn=ldbmdatabase,cn=plugins,
cn=config
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Parameter
Description
ValidValues
on|off
DefaultValue
off
Syntax
DirectoryString
Example
nsslapd-db-verbose:off
4.1.20.nsslapd-dbncache
ThisattributecansplittheLDBMcacheintoequallysizedseparatepiecesofmemory.Itis
possibletospecifycachesthatarelargeenoughsothattheycannotbeallocatedcontiguously
onsomearchitectures;forexample,somereleasesofSolarislimittheamountofmemorythat
maybeallocatedcontiguouslybyaprocess.If
nsslapd-dbncache
is
0
or
1
,thecachewillbe
allocatedcontiguouslyinmemory.Ifitisgreaterthan
1
,thecachewillbebrokenupinto
ncache
,equallysizedseparatepiecesofmemory.
Toconfigureadbcachesizelargerthan4gigabytes,addthe
nsslapd-dbncache
attributeto
cn=config, cn=ldbm m database, cn=plugins, , cn=config
betweenthe
nsslapd-dbcachesize
and
nsslapd-db-logdirectory
attributelines.
Setthisvaluetoanintegerthatisone-quarter(1/4)theamountofmemoryingigabytes.For
example,fora12gigabytesystem,setthe
nsslapd-dbncache
valueto
3
;foran8gigabyte
system,setitto
2
.
Thisattributeisprovidedonlyforsystemmodification/diagnosticsandshouldbechangedonly
withtheguidanceofRedHattechnicalsupportorRedHatprofessionalservices.Inconsistent
settingsofthisattributeandotherconfigurationattributesmaycausetheDirectoryServertobe
unstable.
Theserverhastoberestartedforchangestothisattributetogointoeffect.
Parameter
Description
EntryDN
cn=config,cn=ldbmdatabase,cn=plugins,
cn=config
ValidValues
1to4
DefaultValue
1
Syntax
Integer
Example
nsslapd-dbncache:1
4.1.21.nsslapd-directory
Thisattributespecifiesabsolutepathtodatabaseinstance.Ifthedatabaseinstanceismanually
createdthenthisattributemustbeincluded,somethingwhichissetbydefault(andmodifiable)
intheDirectoryServerConsole.Oncethedatabaseinstanceiscreated,donotmodifythispath
cn=ldbmdatabase,cn=plugins,cn=config
143
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asanychangesriskpreventingtheserverfromaccessingdata.
Parameter
Description
EntryDN
cn=config,cn=ldbmdatabase,cn=plugins,
cn=config
ValidValues
Anyvalidabsolutepathtothedatabase
instance
DefaultValue
Syntax
DirectoryString
Example
nsslapd-directory:
/var/lib/dirsrv/slapd-
instance_name
/db
4.1.22.nsslapd-import-cachesize
Thisperformancetuning-relatedattributedeterminesthesizeofthedatabasecacheusedinthe
bulkimportprocess.Settingthisattributevaluesothatthemaximumavailablesystemphysical
memoryisusedforthedatabasecacheduringbulkimportingoptimizesbulkimportspeed.
Attemptingtosetavaluethatisnotanumberoristoobigfora32-bitsignedintegerreturnsan
LDAP_UNWILLING_TO_PERFORM
errormessage,withadditionalerrorinformationexplainingthe
problem.
NOTE
Acacheiscreatedforeachloadthatoccurs.Forexample,iftheusersetsthe
nsslapd-import-cachesize
attributeto1gigabyte,then1gigabyteisused
whenloadingonedatabase,2gigabytesisusedwhenloadingtwodatabases,
andsoon.Ensurethereissufficientphysicalmemorytopreventswappingfrom
occurring,asthiswouldresultinperformancedegradation.
Parameter
Description
EntryDN
cn=config,cn=ldbmdatabase,cn=plugins,
cn=config
ValidRange
500kilobytesto4gigabytesfor32-bit
platformsand500kilobytesto2^64-1for
64-bitplatforms
DefaultValue
20000000
Syntax
Integer
Example
nsslapd-import-cachesize:20000000
4.1.23.nsslapd-import-cache-autosize
Chapter3.Plug-inImplementedServerFunctionalityReference
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Thisperformancetuning-relatedattributeautomaticallysetsthesizeoftheimportcache
(
importCache
)tobeusedduringthecommand-line-basedimportprocessofLDIFfilestothe
database(the
ldif2db
operation).
InDirectoryServer,theimportoperationcanberunasaservertaskorexclusivelyonthe
command-line.Inthetaskmode,theimportoperationrunsasageneralDirectoryServer
operation.The
nsslapd-import-cache-autosize
attributeenablesthe
importCache
tobeset
automaticallytoapredeterminedsizewhentheimportoperationisrunonthecommand-line.
TheattributecanalsobeusedbyDirectoryServerduringthetaskmodeimportforallocatinga
specifiedpercentageoffreememoryfor
importCache
.
Bydefault,the
nsslapd-import-cache-autosize
attributeisenabledandissettoavalueof
-1
.Thisvalueautosizes
importCache
forthe
ldif2db
operationonly,automaticallyallocating
fiftypercent(50%)ofthefreephysicalmemoryfor
importCache
.Thepercentagevalue(50%)is
hardcodedandcannotbechanged.
Settingtheattributevalueto
50
(
nsslapd-import-cache-autosize: 50
)hasthesameeffect
onperformanceduringan
ldif2db
operation.However,suchasettingwillhavethesameeffect
onperformancewhentheimportoperationisrunasaDirectoryServertask.The
-1
value
autosizes
importCache
justforthe
ldif2db
operationandnotforany,includingimport,general
DirectoryServertasks.
NOTE
Thepurposeofa
-1
settingistoenablethe
ldif2db
operationtobenefitfrom
freephysicalmemorybut,atthesametime,notcompeteforvaluablememory
with
entryCache
,whichisusedforgeneraloperationsoftheDirectoryServer.
Settingthe
nsslapd-import-cache-autosize
attributevalueto
0
turnsoffthe
importCache
autosizingfeature-thatis,noautosizingoccursduringeithermodeoftheimportoperation.
Instead,DirectoryServerusestheSection4.1.22,“nsslapd-import-cachesize” attributefor
importcachesize,withadefaultof
20,000,000
.
TherearethreecachesinthecontextofDirectoryServer:
dbCache
,
entryCache
,and
importCache
.
importCache
isonlyusedduringtheimportoperation.The
nsslapd-cache-autosize
attribute,whichisusedforautosizing
entryCache
and
dbCache
,is
usedduringtheDirectoryServeroperationsonlyandnotduringthe
ldif2db
command-line
operation;theattributevalueisthepercentageoffreephysicalmemorytobeallocatedfor
entryCache
and
dbCache
.
Ifboththeautosizingattributes,
nsslapd-cache-autosize
and
nsslapd-import-cache-autosize
,areenabled,ensurethattheirsumislessthan100.
Parameter
Description
EntryDN
cn=config,cn=ldbmdatabase,cn=plugins,
cn=config
DatabaseAttributesundercn=config,
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Parameter
Description
ValidRange
-1,0(turnsimportcacheautosizingoff)to100
DefaultValue
-1(turnsimportcacheautosizingonfor
ldif2dbonlyandallocates50%ofthefree
physicalmemoryto
importCache
)
Syntax
Integer
Example
nsslapd-import-cache-autosize:-1
4.1.24.nsslapd-mode
Thisattributespecifiesthepermissionsusedfornewlycreatedindexfiles.
Parameter
Description
EntryDN
cn=config,cn=ldbmdatabase,cn=plugins,
cn=config
ValidValues
Anyfour-digitoctalnumber.However,mode
0600
isrecommended.Thisallowsreadand
writeaccessfortheowneroftheindexfiles
(whichistheuseraswhomthe
ns-slapd
runs)andnoaccessforotherusers.
DefaultValue
600
Syntax
Integer
Example
nsslapd-mode:0600
4.2.DatabaseAttributesundercn=monitor,cn=ldbmdatabase,
cn=plugins,cn=config
Globalread-onlyattributescontainingdatabasestatisticsformonitoringactivityonthe
databasesarestoredinthe
cn=monitor, cn=ldbm m database, cn=plugins, , cn=config
tree
node.Formoreinformationontheseentries,refertothe"MonitoringServerandDatabase
Activity"chapterintheDirectoryServerAdministrationGuide.
dbcachehits.
Thisattributeshowstherequestedpagesfoundinthedatabase.
dbcachetries.
Thisattributeshowsthetotalcachelookups.
dbcachehitratio.
Thisattributeshowsthepercentageofrequestedpagesfoundinthedatabasecache(hits/tries).
Chapter3.Plug-inImplementedServerFunctionalityReference
146
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dbcachepagein.
Thisattributeshowsthepagesreadintothedatabasecache.
dbcachepageout.
Thisattributeshowsthepageswrittenfromthedatabasecachetothebackingfile.
dbcacheroevict.
Thisattributeshowsthecleanpagesforcedfromthecache.
dbcacherwevict.
Thisattributeshowsthedirtypagesforcedfromthecache.
4.3.DatabaseAttributesundercn=NetscapeRoot,cn=ldbm
database,cn=plugins,cn=configandcn=UserRoot,cn=ldbm
database,cn=plugins,cn=config
The
cn=NetscapeRoot
and
cn=UserRoot
subtreescontainconfigurationdatafor,orthe
definitionof,thedatabasescontainingthe
o=NetscapeRoot
and
o=UserRoot
suffixes,
respectively.The
cn=NetscapeRoot
subtreecontainstheconfigurationdatausedbythe
AdministrationServerforauthenticationandallactionsthatcannotbeperformedthroughLDAP
(suchasstart/stop),andthe
cn=UserRoot
subtreecontainsalltheconfigurationdataforthe
user-defineddatabase.
The
cn=UserRoot
subtreeiscalleduserRootbydefault.However,thisisnothard-codedand,
giventhefactthattherearegoingtobemultipledatabaseinstances,thisnameischangedand
definedbytheuserasandwhennewdatabasesareadded.Thefollowingattributesare
commontoboththe
cn=NetscapeRoot, cn=ldbm database, cn=plugins, cn=config
and
cn=userRoot, cn=ldbm m database, cn=plugins, , cn=config
subtrees.
4.3.1.nsslapd-cachesize
Thisperformancetuning-relatedattributespecifiesthecachesizeintermsoftheentriesitcan
hold.However,itissimplertolimitbymemorysizeonly(asinSection4.3.2,
“nsslapd-cachememsize” ).Attemptingtosetavaluethatisnotanumberoristoobigfora
32-bitsignedintegerreturnsan
LDAP_UNWILLING_TO_PERFORM
errormessagewithadditional
errorinformationexplainingtheproblem.
Theserverhastoberestartedforchangestothisattributetogointoeffect.
Parameter
Description
EntryDN
cn=NetscapeRoot,cn=ldbmdatabase,
cn=plugins,cn=configorcn=UserRoot,
cn=ldbmdatabase,cn=plugins,cn=config
cn=ldbmdatabase,cn=plugins,cn=config
147
Parameter
Description
ValidRange
1to2,147,483,647(or-1,whichmeans
limitless)entries
DefaultValue
-1
Syntax
Integer
Example
nsslapd-cachesize:-1
4.3.2.nsslapd-cachememsize
Thisperformancetuning-relatedattributespecifiesthecachesizeintermsofavailablememory
space.Thesimplestmethodislimitingcachesizeintermsofmemoryoccupied.Activating
automaticcacheresizingoverridesthisattribute,replacingthesevalueswithitsownguessed
valuesatalaterstageoftheserverstartup.Attemptingtosetavaluethatisnotanumberoris
toobigfora32-bitsignedintegerreturnsan
LDAP_UNWILLING_TO_PERFORM
errormessagewith
additionalerrorinformationexplainingtheproblem.
Parameter
Description
EntryDN
cn=NetscapeRoot,cn=ldbmdatabase,
cn=plugins,cn=configorcn=UserRoot,
cn=ldbmdatabase,cn=plugins,cn=config
ValidRange
500kilobytesto4gigabytesfor32-bit
platformsand500kilobytesto2^64-1for
64-bitplatforms
DefaultValue
10,485,760(10megabytes)
Syntax
Integer
Example
nsslapd-cachememsize:10485760
4.3.3.nsslapd-directory
Thisattributespecifiesthepathtothedatabaseinstance.Ifitisarelativepath,itstartsfromthe
pathspecifiedby
nsslapd-directory
intheglobaldatabaseentry
cn=config, cn=ldbm
database, cn=plugins, , cn=config
.Thedatabaseinstancedirectoryisnamedafterthe
instancenameandlocatedintheglobaldatabasedirectory,bydefault.Afterthedatabase
instancehasbeencreated,donotmodifythispath,becauseanychangesriskpreventingthe
serverfromaccessingdata.
Parameter
Description
EntryDN
cn=instancename,cn=ldbmdatabase,
cn=plugins,cn=config
ValidValues
Anyvalidpathtothedatabaseinstance
DefaultValue
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148
Parameter
Description
Syntax
DirectoryString
Example
nsslapd-directory:
/var/lib/dirsrv/slapd-
instance_name
/db/userRoot
4.3.4.nsslapd-readonly
Thisattributespecifiesread-onlymodeforasingleback-endinstance.Ifthisattributehasa
valueof
off
,thenusershaveallread,write,andexecutepermissionsallowedbytheiraccess
permissions.
Parameter
Description
EntryDN
cn=NetscapeRoot,cn=ldbmdatabase,
cn=plugins,cn=configorcn=UserRoot,
cn=ldbmdatabase,cn=plugins,cn=config
ValidValues
on|off
DefaultValue
off
Syntax
DirectoryString
Example
nsslapd-readonly:off
4.3.5.nsslapd-require-index
Whenswitchedto
on
,thisattributeallowsonetorefuseunindexedsearches.This
performance-relatedattributeavoidssaturatingtheserverwitherroneoussearches.
Parameter
Description
EntryDN
cn=NetscapeRoot,cn=ldbmdatabase,
cn=plugins,cn=configorcn=UserRoot,
cn=ldbmdatabase,cn=plugins,cn=config
ValidValues
on|off
DefaultValue
off
Syntax
DirectoryString
Example
nsslapd-require-index:off
4.3.6.nsslapd-suffix
Thisattributespecifiesthesuffixofthedatabaselink.Thisisasingle-valuedattributebecause
eachdatabaseinstancecanhaveonlyonesuffix.Previously,itwaspossibletohavemorethan
onesuffixonasingledatabaseinstance,butthisisnolongerthecase.Asaresult,thisattribute
issingle-valuedtoenforcethefactthateachdatabaseinstancecanonlyhaveonesuffixentry.
Anychangesmadetothisattributeaftertheentryhasbeencreatedtakeeffectonlyafterthe
DatabaseAttributesunder
149
servercontainingthedatabaselinkisrestarted.
Parameter
Description
EntryDN
cn=NetscapeRoot,cn=ldbmdatabase,
cn=plugins,cn=configorcn=UserRoot,
cn=ldbmdatabase,cn=plugins,cn=config
ValidValues
AnyvalidDN
DefaultValue
Syntax
DirectoryString
Example
nsslapd-suffix:o=NetscapeRoot
4.4.DatabaseAttributesundercn=database,cn=monitor,
cn=ldbmdatabase,cn=plugins,cn=config
Theattributesinthistreenodeentryareallread-only,databaseperformancecounters.Allof
thevaluesfortheseattributesare32-bitintegers.
nsslapd-db-abort-rate.
Thisattributeshowsthenumberoftransactionsthathavebeenaborted.
nsslapd-db-active-txns.
Thisattributeshowsthenumberoftransactionsthatarecurrentlyactive.
nsslapd-db-cache-hit.
Thisattributeshowstherequestedpagesfoundinthecache.
nsslapd-db-cache-try.
Thisattributeshowsthetotalcachelookups.
nsslapd-db-cache-region-wait-rate.
Thisattributeshowsthenumberoftimesthatathreadofcontrolwasforcedtowaitbefore
obtainingtheregionlock.
nsslapd-db-cache-size-bytes.
Thisattributeshowsthetotalcachesizeinbytes.
nsslapd-db-clean-pages.
Thisattributeshowsthecleanpagescurrentlyinthecache.
nsslapd-db-commit-rate.
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150
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