ORACLE Dataguard vs Real Application Cluster (RAC)
RAC thiab Cov Ntaub Ntawv Tiv Thaiv yog cov ncauj lus tseem ceeb hauv Oracle Siab Muaj. Ob qho ntawm cov qauv no muaj ntau yam kev txhim kho hauv Oracle 11gR2 dua li 10g thiab 9i. ORACLE pom zoo kom muaj kev sib xyaw ntawm RAC thiab cov ntaub ntawv tiv thaiv kom tau txais txiaj ntsig siab tshaj plaws ntawm cov ntaub ntawv qib thiab qib kev tiv thaiv.
RAC yog dab tsi?
RAC stands rau Real Application Cluster. Qhov no yog ib pawg ntawm cov database. Qhov ntawd txhais tau tias ib qho database siv cov peev txheej ntawm ob lossis ntau lub servers. Hauv lwm lo lus, ob lossis ntau qhov piv txwv tau khiav ntawm ob lossis ntau lub servers (nodes) txuas rau tib lub database. Tag nrho cov piv txwv no muaj kev nyeem ntawv nkag mus rau hauv database. Yog tias ib qho ntawm cov nodes ntawm cov tshuab poob qis, cov ntaub ntawv tsis poob qis. Cov neeg siv tseem muaj kev nkag mus rau cov ntaub ntawv los ntawm lwm cov nodes (automatically directs cov kev sib txuas los mus rau lub server ua tsis tau tejyam, mus rau ib tug khiav node). Cluster ware software thiab sib koom disks yog siv los khaws kev sib txuas thiab kev sib txuas lus ntawm ntau lub servers. RAC yog ib qho kev daws teeb meem zoo rau kho vajtse tsis ua haujlwm, kev ua haujlwm tsis zoo, thiab software tsis ua haujlwm.
Data Guard yog dab tsi?
Cov ntaub ntawv tus neeg saib xyuas yog ib qho kev teeb tsa, uas muaj tsawg kawg yog ib qho chaw khaws cia ntawm cov ntaub ntawv tseem ceeb. Lub hauv paus database tuaj yeem muaj ib lossis ntau qhov chaw khaws cia. Qhov kev teeb tsa tag nrho no yog hu ua tus neeg saib xyuas cov ntaub ntawv. Lub standby databases tuaj yeem khiav ntawm cov qauv hauv qab no, yog tias cov ntaub ntawv tseem ceeb muaj tsawg kawg yog ib qho ntawm cov qauv database.
- hom kev tiv thaiv ntau tshaj
- hom muaj ntau tshaj plaws
- hom kev ua haujlwm siab tshaj
Ob qho tib si thawj thiab cov chaw khaws ntaub ntawv standby ua ke yog hu ua tus neeg saib xyuas cov ntaub ntawv. Muaj ob hom standby databases ib yam nkaus. Lawv yog,
- Lub cev Standby Databases
- Logical Standby Databases
Ob qho tib si ntawm cov chaw khaws ntaub ntawv tam sim no yeej ib txwm synchronizing nrog lawv cov ntaub ntawv tseem ceeb. Standby databases tuaj yeem nyob ntawm tib qhov chaw lossis ib qhov chaw sib cais (pom zoo) ntawm cov ntaub ntawv tseem ceeb. Yog li, cov ntaub ntawv tiv thaiv yog cov kev daws teeb meem zoo rau SITE tsis ua haujlwm ntau dua li qhov ua tsis tiav, software tsis ua haujlwm thiab kho vajtse tsis ua haujlwm.
Dab tsi yog qhov txawv ntawm Oracle RAC thiab Data Guard?
• RAC muaj ib lub database thiab ntau qhov piv txwv nrog nws, tab sis tus neeg saib xyuas cov ntaub ntawv muaj ntau lub databases (ib qho tseem ceeb thiab lwm cov ntaub ntawv standby).
• RAC yog qhov kev pom zoo daws teeb meem piv txwv li, software thiab kho vajtse qib tsis ua haujlwm. Cov ntaub ntawv tiv thaiv yog qhov kev pom zoo daws teeb meem rau SITE tsis ua haujlwm.
• Cluster ware software yog siv los khaws kev sib txuas thiab kev sib txuas lus ntawm txhua qhov ntawm RAC, tab sis hauv cov ntaub ntawv khaws cia, pawg ware software tsis siv. (yog tias tus neeg saib xyuas cov ntaub ntawv tsis yog rau RAC)
• RAC yuav tsum muaj kev sib koom ua ke, uas tuaj yeem nkag tau los ntawm tag nrho cov nodes ntawm lub kaw lus, tab sis hauv cov ntaub ntawv tiv thaiv tsis muaj kev sib koom ua ke, uas yog ib txwm muaj rau txhua qhov chaw.
• RAC tuaj yeem muaj ntau tshaj 100 ntawm. Tus neeg saib xyuas cov ntaub ntawv tuaj yeem muaj qhov siab tshaj cuaj qhov chaw tos txais.
