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Aug 07, 2025 pm 06:14 PM
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PrimaryKeydoesnotallownUllValues, whileiqueKeyAllowsonEnull; 2. AtableCanHaveOnlyOnePrimaryKeybutmultipleUniquekes; 3. PrimaryKeyAutomically StreatesAclusterEdIndex, whereuniquekeyCreatesAnon-ClusteredIndex;

Aug 07, 2025 pm 06:01 PM
SQL?? ??? ?? ???? ??? ??????

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Aug 07, 2025 pm 05:46 PM
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Aug 07, 2025 pm 05:41 PM
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Pmon, Smon, DBWN, LGWR ? CKPT? ?? Oracle ?? ????? ??? ?? ? ? ?????

Pmon, Smon, DBWN, LGWR ? CKPT? ?? Oracle ?? ????? ??? ?? ? ? ?????

Oracle ??????? ?? ?? ?????? Pmon, Smon, DBWN, LGWR ? CKPT? ?????. PMON? ??? ??? ????? ????, ???? ?? ????? ????, ???? ???? ???? ??? ?????. SMON? ?? ?? ??? ?? ??? ??? ?? ??? ???? ?? ??? ?????. DBWN? ??? ??? ??? ??? ???? ???? I/O? ??? ?? ?? ??; LGWR? ???? ?? ??? ????? Redo Log ??? ???? ???. CKPT? ?? ???? ???? DBWN? ??? ???? ???? ?? ??? ??? ???????. ??? ????? ???? ??????? ???? ??? ???? ???? ?????.

Aug 07, 2025 pm 04:59 PM
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Aug 07, 2025 pm 04:54 PM
Oracle? ????? ??? ???? ??

Oracle? ????? ??? ???? ??

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Aug 07, 2025 pm 04:39 PM
SQL? Blob ? Clob ??? ??? ??????

SQL? Blob ? Clob ??? ??? ??????

blobstoresbinarydatalikeimages, ???, orpdfsasrawbyteswithcharacterencoding, whileclobstoreslargetextsuchasarticlesorjsonusingcharacterencoding likeutf-8andsupportsspringoperations;

Aug 07, 2025 pm 04:22 PM
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Aug 07, 2025 pm 04:00 PM
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Aug 07, 2025 pm 03:23 PM
MySQL?? max_connections ?? ??? ??

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