Video: Newsequentialid yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Tsim ib qho GUID uas ntau dua ib qho GUID yav dhau los tsim los ntawm cov haujlwm no ntawm lub khoos phis tawj uas tau teev tseg txij li Windows tau pib. NEWSEQUENTIALID yog wrapper tshaj Windows UuidCreateSequential muaj nuj nqi, nrog rau qee qhov byte shuffling thov. Ceeb toom. UuidCreateSequential muaj nuj nqi muaj kho vajtse dependencies.
Tom qab ntawd, ib tus tuaj yeem nug, puas yog GUIDs ua ntu zus?
Sequential GUIDs tsis yog tiag ua ntu zus.
Kuj Paub, dab tsi yog tus cim tshwj xeeb hauv SQL? Feem ntau Uniqueidentifier yog 36 ntsis alphanumeric tshwj xeeb Tus nqi uas yuav tsis muab luam tawm. Nws syntax yog XXXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX. Nws yog hom ntaub ntawv hauv SQLServer & nws yuav siv feem ntau ua tus yuam sij tseem ceeb. Uniqueidentifier yog 16-byte binary qhov tseem ceeb uas ua haujlwm thoob ntiaj teb cov cim tshwj xeeb (GUIDs).
Cov lus nug tseem yog, kuv puas yuav tsum siv GUID ua tus yuam sij tseem ceeb?
Koj database qhov tseem ceeb yuav tsum TSIS TXHOB muaj lub ntsiab lus ua lag luam. Yog li ntxiv cov GUID raws li koj txoj kev lag luam tus yuam sij , thiab normal thawj tus yuam sij (feem ntau yog ntev int) raws li lub database thawj tus yuam sij . Koj tuaj yeem tso ib qho kev ntsuas tshwj xeeb rau ntawm qhov GUID los xyuas kom meej uniqueness. Qhov ntawd yog tham database theory ntawm chav kawm, tab sis nws yog kev xyaum zoo thiab.
Rowguidcol SQL Server yog dab tsi?
ROWGUIDCOL feem ntau yog siv rau MERGE replication, thiab tseem yuav tsum tau rau FILESTREAM, tab sis yuav siv tau nyob rau hauv tej scenario qhov twg koj xav kom ib tug immutable kem cais los ntawm lub hauv paus ntsiab lus (piv txwv li nyob rau hauv cov ntaub ntawv uas tus nqi tseem ceeb yuav hloov, tab sis koj tseem xav tau. yuav qhia tau tias kab twg ua ntej thiab tom qab
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