Video: Qhov chaw Oracle yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Tablespaces yog tus choj ntawm qee yam ntawm lub cev thiab cov laj thawj ntawm cov Oracle database. Tablespaces yog qhov chaw koj khaws Oracle database khoom xws li rooj , indexes thiab rollback ntu. Koj tuaj yeem xav txog ib rooj zoo li ib qho kev sib koom disk drive hauv Windows.
Hais txog qhov no, dab tsi yog tablespace hauv Oracle nrog piv txwv?
Ib Oracle database yog suav nrog ib lossis ntau qhov chaw cia khoom hu ua cov rooj zaum . Ib tug database cov ntaub ntawv yog collectively khaws cia rau hauv datafiles uas tsim txhua rooj ntawm lub database. Rau piv txwv , qhov yooj yim tshaj plaws Oracle database yuav muaj ib tug rooj thiab ib datafile.
Qhov thib ob, qhov chaw nyob hauv SQL yog dab tsi? A qhov chaw rooj yog ib tug cia qauv, nws muaj rooj , indexes, cov khoom loj, thiab cov ntaub ntawv ntev. Nws tuaj yeem siv los teeb tsa cov ntaub ntawv hauv cov ntaub ntawv mus rau hauv cov ntaub ntawv khaws cia uas cuam tshuam nrog qhov twg cov ntaub ntawv khaws cia rau hauv qhov system.
Ntxiv mus, koj yuav nrhiav tau qhov chaw hauv lub rooj li cas?
Txhawm rau kom tau txais cov rooj zaum rau tag nrho Oracle rooj hauv ib lub tsev qiv ntawv tshwj xeeb: SQL> xaiv table_name, tablespace_name los ntawm all_tables qhov twg tus tswv = 'USR00'; Kom tau txais cov rooj rau ib qho Oracle Performance index: SQL> xaiv tablespace_name los ntawm all_indexes qhov twg tus tswv = 'USR00' thiab index_name = 'Z303_ID';
Oracle cov rooj khaws cia nyob qhov twg?
Yog li Oracle rooj (lawv txhais thiab lawv cov ntaub ntawv) yog khaws cia hauv cov rooj zaum. Tablespaces, nyob rau hauv lem, yog khaws cia hauv cov ntaub ntawv. Feem ntau cov ntaub ntawv muaj "DBF" txuas ntxiv thiab nyob rau hauv cov chaw xaiv (feem ntau yog "ORADATA" folder). Kuv qhia koj kom mus saib lub Oracle database references kom paub meej ntxiv.
Pom zoo:
Qhov txawv ntawm qhov chaw nyob thiab qhov chaw nyob yog dab tsi?
Qee zaum, 'txoj kev chaw nyob' hais txog koj lub cev qhov chaw nyob ntawm qib zoo dua hauv nroog. Piv txwv li, '1313Mockingbird Lane', tsis muaj lub nroog lub npe txuas nrog. Tab sis yog, feem ntau nws tsuas yog ib daim ntawv rov qab kom paub qhov txawv ntawm qhov chaw xa ntawv (thaum chiv keeb) thiab tam sim no e-mail chaw nyob, chaw nyob hauv web, IPaddress, thiab lwm yam
Qhov chaw nyob ntawm lub cev thiab qhov chaw nyob qhov chaw nyob yog dab tsi?
Qhov sib txawv yooj yim ntawm Logical thiab lub cev chaw nyob yog qhov chaw nyob Logical yog tsim los ntawm CPU hauv kev xav ntawm ib qho kev pab cuam. Ntawm qhov tod tes, qhov chaw nyob ntawm lub cev yog qhov chaw nyob uas muaj nyob hauv lub cim xeeb. Cov txheej txheem ntawm txhua qhov chaw nyob uas tsim los ntawm CPU fora program hu ua Logical Address Space
Qhov txawv ntawm qhov chaw kub thiab qhov chaw txias yog dab tsi?
Thaum lub chaw kub kub yog ib daim qauv ntawm cov chaw khaws ntaub ntawv nrog tag nrho koj cov khoom siv kho vajtse thiab software ua haujlwm nrog koj lub xaib thawj zaug, qhov chaw txias tau muab tshem tawm - tsis muaj server hardware, tsis muaj software, tsis muaj dab tsi. Kuj tseem muaj qhov chaw sov uas nyob nruab nrab ntawm qhov chaw kub thiab qhov chaw txias los ntawm cov khoom siv
Dab tsi yog qhov qub txeeg qub teg Dab tsi yog qhov sib txawv ntawm qhov qub txeeg qub teg piav nrog piv txwv?
Inheritance yog ib txoj hauv kev kom tau txais cov yam ntxwv thiab kev coj cwj pwm ntawm ib chav kawm los ntawm lwm chav kawm. Cov chav kawm uas cov tswv cuab tau txais qub txeeg qub teg yog hu ua chav kawm hauv paus, thiab chav kawm uas tau txais cov tswv cuab tam sim no hu ua chav derived. Inheritance siv IS-A kev sib raug zoo
Qhov txawv ntawm qhov chaw nyob sib txuas lus thiab qhov chaw nyob ruaj khov yog dab tsi?
Qhov chaw nyob xa ntawv yog chaw nyob sib txuas lus piv txwv li qhov koj nyob tam sim no. & chaw nyob Apermanent yog ntawm koj cov ntaub ntawv yog sau rau ntawm koj daim ntawv pov thawj hnub yug & daim npav pov npav. Qhov chaw nyob ruaj khov & kev sau ntawv yuav zoo ib yam lossis txawv ntawm cov ntaub ntawv siv tau