Yog tias ib tug neeg nug koj cov lus nug "Puas rov tsim kho cov ntaub ntawv hloov tshiab tshiab?", tej zaum koj yuav hais tias "tau kawg". Tej zaum koj yuav xav tsis thoob thaum paub tias index rebuild tsis hloov tag nrho cov txheeb caisNco ntsoov tias tsis yog qhov ntsuas ntsuas txhais tau tias cov txheeb cais cuam tshuam nrog kab / kab uas tau tsim los yog tsim manually.
Kuv puas yuav tsum hloov kho cov txheeb cais tom qab tsim qhov ntsuas?
Koj yuav tsum tsis txhob hloov kho cov txheeb cais tom qab koj rov tsim qhov Performance index raws li kev tsim kho nws muab cov ntaub ntawv tshiab rau koj.
Puas rov tshem tawm qhov ntsuas qhov sib cais lossis hloov kho cov txheeb cais thiab lwm yam?
Index fragmentation yuav tsis raug cuam tshuam nyob rau hauv txhua txoj kev, cov txheej txheem rov qab kho cov nplooj ntawv cov ntaub ntawv raws nraim 1: 1 raws li ua ntej; tab sis cov ntaub ntawv fragmentation ua los ntawm cov ntaub ntawv loj hlob yuav raug txo, vim hais tias lub restore tsim cov ntaub ntawv nyob rau hauv ib daim.
Yuav ua li cas hloov cov ntaub ntawv txheeb cais ua li cas?
Hloov kho cov txheeb cais kom ntseeg tau tias cov lus nug suav nrog cov txheeb cais tshiab Txawm li cas los xij, kev hloov kho cov txheeb cais ua rau cov lus nug rov ua dua. Peb pom zoo kom tsis txhob hloov kho cov txheeb cais ntau zaus vim tias muaj kev sib pauv ua haujlwm ntawm kev txhim kho cov lus nug thiab lub sijhawm nws yuav siv los ua cov lus nug.
Puas indexes hloov tshiab?
Indexes yog hloov kho tsis siv neeg txog yam uas tau khaws cia rau hauv lawv (cov nqi ntawm cov kab uas tau ntsuas). Txawm li cas los xij qee qhov DBMS xav tau kev saib xyuas tsis tu ncua (aka "rov tsim") ntawm lawv txhawm rau txhawm rau txhim kho qhov khaws cia ntawm qhov ntsuas qhov tseem ceeb.
