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10g & 11g Configuration of TAF(Transparent Application Failover) and Load Balancing [ID 453293.1]

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10g&11g:ConfigurationofTAF(TransparentApplicationFailover)andLoadBalancing[ID453293.1]

	Modified28-SEP-2010TypeHOWTOStatusPUBLISHED

InthisDocument

Goal

Solution

CONCEPTS

CONFIGURATION

Client
SideLoadBalancing

Connect
TimeFailover

Client
SideLoadBalance&Connect-timeFailoverConnectString

TAF
-ClientSideConfiguration

TAF
-ServerSideConfiguration

Troubleshooting
TAF

References

Appliesto:

OracleNetServices-Version:10.1.0.2.0to11.1.0.7.0-Release:10.1to11.1

OracleNetServices-Version:10.1.0.2.0to11.1.0.7.0[Release:10.1to11.1]

Informationinthisdocumentappliestoanyplatform.

Goal

Thisnoteexplainstheconfigurationin10g&11gfor:

1)ClientSideConnectTimeLoadBalance

2)ClientSideConnectTimeFailover

3)ServerSideListenerConnectionLoadBalance

4)TransparentApplicationFailover(TAF)

Solution

CONCEPTS

(1)ClientSideConnect-TimeLoadBalance

Theclientloadbalancingfeatureenablesclientstorandomizeconnectionrequestsamongthelisteners.

TnsnamesParameter:LOAD_BALANCE

The(load_balance=yes)instructsSQLNettoprogressthroughthelistoflisteneraddressesinarandomsequence,balancingtheloadonthevariouslisteners.WhensettoOFF,instructsSQLNettotrytheaddressessequentiallyuntilonesucceeds.

LoadbalancingcanbespecifiedforanADDRESS_LISTorassociatedwithasetofADDRESSesorsetDESCRIPTIONs.

Thisparametermustbecorrectlycodedinyournetservicename(connectdescriptor).

Bydefault,thisparameterissettoONforDESCRIPTION_LISTs.

IfyouuseADDRESS_LIST,(load_balance=yes)shouldbewithinthe(ADDRESS_LIST=)portion.IfyoudonotuseADDRESS_LIST,(load_balance=yes)shouldbewithinthe(description=)portion.

(2)ClientSideConnect-Timefailover

Theconnect-timefailoverenablesclientstoconnecttoanotherlisteneriftheinitialconnectiontothefirstlistenerfails.Thenumberoflistenerprotocoladdressesdetermineshowmanylistenersaretried.Without

connect-timefailover,OracleNetattemptsaconnectionwithonlyonelistener.Thedefaultison.

TnsnamesParameter:FAILOVER

(failover=on)isdefaultforADDRESS_LISTs,DESCRIPTION_LISTs,andasetof

DESCRIPTIONs.,therefore,youdonothavetospecifyitexplicitly.

(3)ServerSideListenerConnectionLoadBalance

Thelistenerconnectionloadbalancingfeatureimprovesconnectionperformancebybalancingthenumberofactiveconnectionsamongmultipledispatchersandinstances.Inasingle-instanceenvironment,thelistenerselectstheleastloadeddispatchertohandle
theincomingclientrequests.InanOracleRealApplicationClusters(RAC)environment,connectionloadbalancingalsohasthecapabilitytobalancethenumberofactiveconnectionsamongmultipleinstances.

1.Least-loadednode

2.Least-loadedinstance

3.Least-loadeddispatcherforthatinstance(incaseofSharedserverconfiguration)

Therearetwotypesofserver-sideloadbalancing:

LoadBased—Serversideloadbalancingredirectsconnectionsbydefaultdependingonnodeload.From10.2onwardsyoucanworkthiswithLoadbalancingadvisory(LBA).Thiswillnotbeeffectiveforloginstormsastheconnections
arealreadyinthelistenerafterwhichPMONupdateontheloadcomestothelistener.

SessionBased—Sessionbasedloadbalancingtakesintoaccountthenumberofsessionsconnectedtoeachnodeandthendistributestheconnectionstobalancethenumberofsessionsacrossthedifferentnodes.

Sessioncountbalancingisusedwhenyousetalistenerparameter,PREFER_LEAST_LOADED_NODE_<listener_name>=OFF(<listener_name>istheactualnameofthelistenerwhichisdifferentoneachnodeinyourclusterandbydefaultisconstructedas"listener_<nodename>").
Pleasebeawarethatconnectionsbursts(largenumberofconnectionsinitiatedveryquicklyoneafteranother)maynotbeproperlybalancedduetostatisticsupdatelatency.

(4)TransparentApplicationFailover(TAF)

TransparentApplicationFailover(TAF)isafeatureoftheOracleCallInterface(OCI)driveratclientside.Itenablestheapplicationtoautomaticallyreconnecttoadatabase,ifthedatabaseinstancetowhichtheconnectionismadefails.Inthiscase,
theactivetransactionsrollback.

TnsnamesParameter:FAILOVER_MODE

Whenaninstancetowhichaconnectionisestablishedfailsorisshutdown,theconnectionontheclientsidebecomesstaleandwouldthrowexceptionstothecallertryingtouseit.TAFenablestheapplicationtotransparentlyreconnecttoapreconfigured
secondaryinstancecreatingafreshconnection,butidenticaltotheconnectionthatwasestablishedonthefirstoriginalinstance.

CONFIGURATION

Wewilltakea2nodesetupforthisentireconfigurationexample

Node1:

Hostname:node1.idc.oracle.com

VIPHostname:node1-vip.idc.oracle.com

DatabaseService_names:service.idc.oracle.com

SID:sid1

Node2:

Hostname:node2.idc.oracle.com

VIPHostname:node2-vip.idc.oracle.com

DatabaseService_names:service.idc.oracle.com

SID:sid2

Note:Ensurethatthenode1-vip.idc.oracle.comandnode2-vip.idc.oracle.comisresolvable&reachablefromclients.IfneededYoumayreplacethehostnameswithIPaddressintheentireconfigurationfiles.

Node1

Listener.ora

LISTENER_NODE1=

(DESCRIPTION=

(ADDRESS_LIST=

(ADDRESS=(PROTOCOL=TCP)(HOST=node1-vip.idc.oracle.com)(PORT=1521)(IP=FIRST))

(ADDRESS=(PROTOCOL=TCP)(HOST=node1.idc.oracle.com)(PORT=1521)(IP=FIRST))

Startthelistener

$lsnrctlstartLISTENER_NODE1

Tnsnames.ora

NODE1_LOCAL=

(ADDRESS=(PROTOCOL=TCP)(HOST=node1-vip.idc.oracle.com)(PORT=1521))

Note:MakesurethistnsaliasNODE1_LOCALisresolvableontheserver,thisensuresPMONpicksuptheentrywithoutproblem.

Thefollowingcommandshouldsucceedonnode1

$tnspingnode1_local

Setthelocal_listenerfornode1

sql>altersystemsetLOCAL_LISTENER='node1_local'scope=bothsid='sid1';

Node2

Listener.ora

LISTENER_NODE2=

(DESCRIPTION=

(ADDRESS_LIST=

(ADDRESS=(PROTOCOL=TCP)(HOST=node2.idc.oracle.com)(PORT=1521)(IP=FIRST))

(ADDRESS=(PROTOCOL=TCP)(HOST=node2-vip.idc.oracle.com)(PORT=1521)(IP=FIRST))

Startthelistener

$lsnrctlstartLISTENER_NODE2

Tnsnames.ora

NODE2_LOCAL=

(ADDRESS=(PROTOCOL=TCP)(HOST=node2-vip.idc.oracle.com)(PORT=1521))

Note:MakesurethistnsaliasNODE2_LOCALisresolvableontheserver,thisensuresPMONpicksuptheentrywithoutproblem.

Thefollowingcommandshouldsucceedonnode2

$tnspingnode2_local

Setthelocal_listenerfornode2

sql>altersystemsetLOCAL_LISTENER='node2_local'scope=bothsid='sid2';

EnabletheserversideLoadbalancing(ifrequired)

Youshouldmakethethelistenersawareofadjacentnodesloadtodotheserversideloadbalance.

TomakePMONtonotifytheloadinformationtoadjacentnodes,youshouldsettheREMOTE_LISTENERparameter.

Addthefollowingtnsaliasinboththenodestnsnames.ora

Node1&Node2Tnsnames.ora

NODE_REMOTE=

(DESCRIPTION=

(ADDRESS_LIST=

(ADDRESS=(PROTOCOL=TCP)(HOST=node1-vip.idc.oracle.com)(PORT=1521))

(ADDRESS=(PROTOCOL=TCP)(HOST=node2-vip.idc.oracle.com)(PORT=1521))

Note:MakesurethistnsaliasNODE_REMOTEisresolvableonalltheservers,thisensuresPMONpicksuptheentrywithoutproblem.

Thefollowingcommandshouldsucceedonallthenodes

$tnspingnode_remote

Settheremotelistenerstoboththenodes

sql>altersystemsetREMOTE_LISTENER='node_remote'scope=both;

ClientSideLoadBalancing

FollowingisanexampleofTNSnetservicealiasforclientsideloadbalancing

CLIENT_LOADBALANCE=

(DESCRIPTION=

(LOAD_BALANCE=yes)

(ADDRESS=(PROTOCOL=TCP)(HOST=node1-vip.idc.oracle.com)(PORT=1521))

(ADDRESS=(PROTOCOL=TCP)(HOST=node2-vip.idc.oracle.com)(PORT=1521))

(CONNECT_DATA=

(SERVICE_NAME=service.idc.oracle.com)

ConnectTimeFailover

SampleconnecttimefailoverTNSnetservicealias

address_listdefaultsthefailover=on

CLIENT_FAILOVER=

(DESCRIPTION=

(ADDRESS_LIST=

(ADDRESS=(PROTOCOL=TCP)(HOST=node1-vip.idc.oracle.com)(PORT=1521))

(ADDRESS=(PROTOCOL=TCP)(HOST=node2-vip.idc.oracle.com)(PORT=1521))

(CONNECT_DATA=

(SERVICE_NAME=service.idc.oracle.com)

ClientSideLoadBalance&Connect-timeFailoverConnectString

CLIENT_LOAD_FAILOVER=

(DESCRIPTION=

(ADDRESS_LIST=

(LOAD_BALANCE=yes)

(ADDRESS=(PROTOCOL=TCP)(HOST=node1-vip.idc.oracle.com)(PORT=1521))

(ADDRESS=(PROTOCOL=TCP)(HOST=node2-vip.idc.oracle.com)(PORT=1521))

(CONNECT_DATA=

(SERVICE_NAME=service.idc.oracle.com)

TAF-ClientSideConfiguration

FailoverModeTypecanbeEitherSESSIONorSELECT.

Sessionfailoverwillhavejustthesessiontofailedovertothenextavailablenode.Theselectquerywillnotberesumed.

YoucanreferthebelowdocumentforvariousoptionsonTAF

Oracle®DatabaseNetServicesAdministrator'sGuide

ChapteronEnablingAdvancedFeaturesofOracleNetServices

SimpleTAFcanbeconfiguredontheclientsidetnsnames.orawithfollowingentry

TAF=

(DESCRIPTION=

(ADDRESS_LIST=

(LOAD_BALANCE=yes)

(ADDRESS=(PROTOCOL=TCP)(HOST=node1-vip.idc.oracle.com)(PORT=1521))

(ADDRESS=(PROTOCOL=TCP)(HOST=node2-vip.idc.oracle.com)(PORT=1521))

(CONNECT_DATA=

(SERVICE_NAME=service.idc.oracle.com)

(failover_mode=(type=select)(method=basic))

TAF-ServerSideConfiguration

TAFcanbeconfiguredwithserversideatthetimeofservicecreationalso.

ReferNote460982.1HowToConfigureServerSideTransparentApplication

Failover

TroubleshootingLoadBalance

Incaseofserversideloadbalancingnothappeningproperly,tostartdiagonisngtheissueyoumaycollectthebelowsetofinformation:

a.Issessionloadbalanceturnedon?

b.Whatistheconnectiondistributiononnodes?

c.Isallthenodesareequalpowerw.r.tCPU/Memory/Hardware?

d.Isthereanyapplicationconnectinglocally(BEQueathconnection)anddoingbigoperationsonanyoneofthenode?

e.Areallthenodesareconfiguredwithpropersettingsoflocal/remotelisteners?

ReferNOTE263599.1UnderstandingandTroubleshootingInstanceLoadBalancing

TroubleshootingTAF

IncaseofclientconnectivityfailuretheidealstartpointtodiagonisetheissueiswithClientSqlnettracingatsupportLevel

ToenabletheclienttracingRefer

NOTE395525.1HowtoEnableOracleSQLNetClient,Server,Listener,KerberosandExternalprocedureTracingfromNetManager

WhilecreatinganServiceRequestwithOracleSupportforTAF,providethefollowinginformationtodiagonisetheproblem:

a.Failedconnectionclientsqlnettracing

b.Executeandprovidetheoutputoffollowingcommandsfromboththenodes:

$sql>showparameterListener

$sql>showparameterservice

$lsnrctlservices<listener_name>

c.Uploadthetnsnames.ora&Listenerlogs(bydefaultcreatedwith<listener_name>.log)frombothnodes.

References

NOTE:226880.1-ConfigurationofLoadBalancingandTransparentApplicationFailover

NOTE:342419.1-ORA-12520:ListenersRunningonVIPAddressin10gorNewerRAC

NOTE:395525.1-HowtoEnableOracleSQLNetClient,Server,Listener,KerberosandExternalprocedureTracingfromNetManager

Related

Products

OracleDatabaseProducts>OracleDatabase>NetServices>OracleNetServices
OracleDatabaseProducts>OracleDatabase>NetServices>OracleNetServices
OracleDatabaseProducts>OracleDatabase>NetServices>OracleNetServices

Keywords

TRANSPARENTAPPLICATIONFAILOVER;TAF;LOADBALANCED;CONNECTTIMEFAILOVER;FAILOVER;REMOTE_LISTENER;FAILOVER_MODE;LOAD_BALANCE

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10g &amp; 11g Configuration of TAF(Transparent Application Failover) and Load Balancing [ID 453293.1]