{"id":343,"date":"2011-11-23T21:42:24","date_gmt":"2011-11-23T13:42:24","guid":{"rendered":"https:\/\/blog.rexdf.org\/?p=343"},"modified":"2011-11-23T21:42:24","modified_gmt":"2011-11-23T13:42:24","slug":"%e5%af%b9%e4%ba%8eoracle%e9%94%81%e7%9a%84%e4%b8%80%e4%ba%9b%e7%90%86%e8%ae%ba%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"https:\/\/blog.rexdf.org\/ja\/2011\/11\/%e5%af%b9%e4%ba%8eoracle%e9%94%81%e7%9a%84%e4%b8%80%e4%ba%9b%e7%90%86%e8%ae%ba%e6%80%bb%e7%bb%93\/","title":{"rendered":"\u5bf9\u4e8eOracle\u9501\u7684\u4e00\u4e9b\u7406\u8bba\u603b\u7ed3"},"content":{"rendered":"

 <\/p>\n

\u9996\u5148\u4ec0\u4e48\u662f\u9501\u5462\uff1f\u53ef\u4ee5\u7406\u89e3\u4e3a\u4ed6\u662f\u5bf9\u4e00\u79cd\u5171\u4eab\u8d44\u6e90\u5e76\u53d1\u8bbf\u95ee\u7684\u4e00\u79cd\u63a7\u5236\uff1a\uff09
\n\u5728\u6570\u636e\u5e93\u4e2d\uff0c\u57fa\u672c\u7684\u9501\u7c7b\u578b\u6709\u4e24\u7c7b\uff0c\u5206\u522b\u662f
\nX-\u6392\u4ed6\u9501\uff1a\u5982\u679c\u5bf9\u8c61\u88ab\u4e00\u4e2a\u6392\u4ed6\u9501\u7ed9\u7410\u4f4f\uff0c\u90a3\u4e48\u6309\u7167\u9501\u7684\u76f8\u5bb9\u6027\u6765\u8bb2\u5176\u4ed6\u4f1a\u8bdd\u5c31\u4e0d\u80fd\u591f\u5728\u5bf9\u8fd9\u4e2a\u4f1a\u8bdd\u6240\u52a0\u9501\u7684\u5bf9\u8c61\u52a0\u4efb\u4f55\u7684\u9501\u3002
\nS-\u5171\u4eab\u9501\uff1a\u5982\u679c\u5bf9\u8c61\u88ab\u4e00\u4e2a\u5171\u4eab\u9501\u7ed9\u9501\u4f4f\uff0c\u90a3\u4e48\u6309\u7167\u9501\u7684\u76f8\u5bb9\u6027\u6765\u8bb2\u5176\u4ed6\u4f1a\u8bdd\u9664\u4e86S\u9501\u672c\u8eab\uff0c\u90fd\u4e0d\u80fd\u5bf9\u8fd9\u4e2a\u4f1a\u8bdd\u6240\u52a0\u9501\u7684\u5bf9\u8c61\u52a0\u4efb\u4f55\u7684\u9501\u3002<\/p>\n

\u90a3\u4e48\u5728Oracle\u6570\u636e\u5e93\u4e2d\u5462\uff0c\u9501\u662f\u591a\u7c92\u5ea6\u7684\uff0c\u800c\u4e14\u4ed6\u7684\u9501\u7c7b\u578b\u53ef\u4ee5\u5206\u4e09\u5927\u7c7b
\n1.DML lock:\u76ee\u7684\u662f\u4e3a\u4e86\u4fdd\u62a4\u6570\u636e\u5b8c\u6574\u6027
\n2.DDL lock:\u76ee\u7684\u662f\u4e3a\u4e86\u4fdd\u62a4\u6570\u636e\u5e93\u5bf9\u8c61\u7684\u7ed3\u6784
\n3.\u4e00\u4e9b\u5185\u90e8\u9501\u548clatch:\u76ee\u7684\u662f\u4e3a\u4e86\u4fdd\u62a4\u6570\u636e\u5e93\u7684\u5185\u90e8\u7ed3\u6784<\/p>\n

\u8fd9\u91cc\u5462\uff0c\u4e3b\u8981\u60f3\u4ecb\u7ecd\u4e00\u4e0bDML\u9501\uff0c\u56e0\u4e3a\u5176\u4ed6\u7c7b\u578b\u7684\u9501\u57fa\u672c\u4e0a\u53ea\u4f1a\u4fdd\u6301\u5f88\u77ed\u7684\u4e00\u6bb5\u65f6\u95f4<\/p>\n

DML\u9501\u5462\u5171\u6709\u4e24\u79cd 1.row level lock\u00a0 2.table level lock<\/p>\n

1.TX(row level lock\uff09
\n\u5148 \u4ecb\u7ecd\u4e00\u4e0b\u884c\u7ea7\u9501\u5427\uff0c\u5176\u5b9e\u5f88\u591a\u4eba\u90fd\u8ba4\u4e3a\u5728\u6570\u636e\u5e93\u4e2d\uff0c\u884c\u7ea7\u9501\u5c31\u662f\u9501\u5b9a\u4e00\u884c\uff08\u6ce8\u610f\u6211\u60f3\u8bf4Oracle\u5728\u6570\u636e\u884c\u4e0a\u9762\u53ea\u6709\u6392\u4ed6\u9501X\uff0c\u800c\u6ca1\u6709\u5171\u4eab\u9501\u4e4b\u7c7b\u7684\u5176\u4ed6\u9501\uff09\u3002\u5f88 \u591a\u670b\u53cb\u8ba4\u4e3a\u4e00\u4e2a\u6570\u636e\u8868\u91cc\u6709\u591a\u5c11\u884c\uff0c\u5c31\u4f1a\u6709\u591a\u5c11\u4e2a\u884c\u7ea7\u522b\u9501\uff0c\u5728Oracle\u5374\u4e0d\u662f\u8fd9\u6837\uff0c\u5176\u5b9e\u9700\u8981\u6f84\u6e05\u7684\u662f\uff0cOracle\u5bf9\u4e8e\u884c\u7ea7\u9501\u662f\u4e8b\u52a1\u7ea7\u7684\u3002\u4e5f\u5c31\u662f\u8bf4\u5f53\u4e00 \u4e2a\u4e8b\u52a1\u53d1\u8d77\u4e00\u4e2a\u66f4\u65b0(update)\u547d\u4ee4\u65f6\uff0c\u65e0\u8bba\u4e8b\u52a1\u6240\u6d89\u53ca\u7684\u884c\u6709\u591a\u5c11\uff0c\u90a3\u4e48Oracle\u53ea\u4f1a\u5206\u914d\u4e00\u4e2aTX\u9501\uff0c\u6240\u4ee5\u5728\u8fd9\u91ccOracle\u662f\u4e0d\u4f1a\u50cf\u5176\u4ed6\u6570\u636e\u5e93 \u4e00\u6837\u6709\u9501\u7684\u5347\u7ea7(lock escalation)\uff0c\u800c\u4e14\u8fd9\u4e2d\u9501\u5347\u7ea7\u4e5f\u5e76\u4e0d\u662f\u6570\u636e\u5e93\u7684\u7279\u6027\uff0c\u4f46\u662f\u4ed6\u4f1a\u6267\u884c\u9501\u7684\u8f6c\u6362\uff0cOracle\u4f1a\u5c3d\u53ef\u80fd\u7684\u5728\u6700\u4f4e\u7ea7\u522b\u52a0\u9501\u3002\u56e0\u6b64\u5bf9\u4e8e\u5f00\u9500\u6765\u8bb21\u4e2a\u9501\u7684 \u5f00\u9500\u548c1000000\u4e2a\u9501\u7684\u5f00\u9500\u5176\u5b9e\u662f\u4e00\u6837\u7684\uff0c\u90fd\u6ca1\u6709\u4ec0\u4e48\u5f00\u9500\u3002\u800c\u4e14Oracle\u4e5f\u4e0d\u4f1a\u50cf\u5176\u4ed6\u6570\u636e\u5e93\u4e00\u6837\u6765\u901a\u8fc7\u7ef4\u62a4\u4e00\u4e2a\u9501\u7684\u5217\u8868\u6765\u7ba1\u7406\u9501\u7684\u8d44\u6e90\uff08\u6bd4\u5982 DB2\uff0c\u901a\u8fc7LOCKLIST\uff0cMAXLOCKS\u4e24\u4e2a\u53c2\u6570\u6765\u5ea6\u91cf\u9501\u7684\u5f00\u9500\uff09\uff0c\u56e0\u4e3a\u5bf9\u4e8eDB2\u6765\u8bf4,\u9501\u662f\u4e00\u79cd\u7a00\u6709\u7684\u8d44\u6e90,\u9700\u8981\u5bf9\u9501\u7684\u4f7f\u7528\u5462,\u8fdb\u884c\u76d1\u63a7,\u7cfb\u7edf \u5f00\u9500\u5c31\u5fc5\u7136\u5f88\u5927,\u800cOracle\u5728\u9501\u7684\u7ef4\u62a4\u4e0a\u5c31\u5927\u5927\u7684\u51cf\u5c11\u4e86\u5f00\u9500\uff0c\u800c\u4e14\u4e5f\u4e0d\u4f1a\u51fa\u73b0\u56e0\u4e3a\u9501\u6570\u91cf\u4e0d\u591f\u65f6\u5f15\u8d77\u7684\u95ee\u9898\uff08\u9501\u5347\u7ea7->\u6b7b\u9501\uff09.
\n\u8ba9\u6211\u4eec\u6765\u5bf9\u6bd4\u4e00\u4e0bDB2\u548cOracle\u5728\u884c\u7ea7\u7684\u52a0\u9501\u8fc7\u7a0b
\nDB2
\n——
\n\u52a0\u9501\u7684\u65f6\u5019
\n1,\u627e\u5230\u60f3\u9501\u5b9a\u90a3\u4e00\u884c\u7684\u5730\u5740
\n2.\u5728locklist\u4e2d\u6392\u961f(\u5176\u5b9e\u8fd9\u79cd\u9501\u7ba1\u7406\u5668\u5c31\u662f\u4e00\u79cd\u4e32\u884c\u5316\u7684\u8bbe\u5907,\u8fd9\u6837\u505a\u7684\u597d\u5904\u662f\u53ef\u4ee5\u6709\u6548\u7684\u907f\u514d\u6d3b\u9501)
\n3.\u9501\u5b9a\u5217\u8868
\n4.\u641c\u7d22\u5217\u8868,\u770b\u770b\u522b\u4eba\u662f\u5426\u5df2\u7ecf\u5bf9\u6211\u8981\u52a0\u9501\u7684\u90a3\u4e00\u6837\u4e0a\u4e86\u9501
\n5,\u5982\u679c\u6ca1\u6709,\u5219\u5728\u5217\u8868\u4e2d\u521b\u5efa\u4e00\u4e2aentry,\u8868\u660e\u6211\u5df2\u7ecf\u9501\u4f4f\u4e86\u8fd9\u4e00\u884c
\n6.\u5bf9\u5217\u8868\u89e3\u9501
\n\u89e3\u9501\u7684\u65f6\u5019
\n1.\u518d\u6b21\u8fdb\u884c\u6392\u961f
\n2.\u9501\u4f4f\u6211\u4eec\u7684\u5217\u8868
\n3.\u5728\u8fd9\u4e2a\u5217\u8868\u4e2d\u641c\u7d22,\u91ca\u653e\u6211\u4eec\u7684\u9501
\n4,\u5bf9\u5217\u89e3\u9501<\/p>\n

\u6211\u4eec\u770bDB2\u5bf9\u4e8e\u9501\u7ba1\u7406\u7684\u5f00\u9500\u8fd8\u662f\u6bd4\u8f83\u7684\u5927,\u9501\u8d8a\u591a\u8868\u660e,\u8fd9\u4e2a\u64cd\u4f5c\u82b1\u7684\u65f6\u95f4\u5c31\u8d8a\u957f,\u5f00\u9500\u5c31\u6bd4\u8f83\u5927.<\/p>\n

\u90a3\u4e48Oracle\u662f\u600e\u4e48\u6765\u505a\u7684\u5462?\u54b1\u4eec\u6765\u770b\u4e00\u4e0b:
\n\u5f53\u6211\u60f3\u8981\u52a0\u9501\u7684\u65f6\u5019
\n1.\u627e\u5230\u8981\u9501\u5b9a\u7684\u4e00\u884c.
\n2.\u5b9a\u4f4d\u90a3\u4e00\u6837,\u7136\u540e\u52a0\u9501
\n\u5bf9,\u6ca1\u9519\u5c31\u662f\u8fd9\u4e48\u7684\u7b80\u5355.\u8ba9\u4f60\u770b\u5230Oracle\u7684\u5b9e\u73b0\u5c31\u662f\u8fd9\u4e48\u7684piece of cake!!Oracle\u4e0d\u9700\u8981\u4f20\u7edf\u7684\u9501\u7ba1\u7406\u5668,\u4e8b\u52a1\u53ea\u662f\u627e\u6570\u636e\u5982\u679c\u6570\u636e\u6ca1\u6709\u88ab\u52a0\u9501,\u5219\u52a0\u9501.<\/p>\n

\u90a3\u4e48Oracle\u6ca1\u6709\u4e86\u9501\u7ba1\u7406\u5668,\u770b\u4f3c\u7b80\u5355\u7684\u95ee\u9898,\u4ed6\u662f\u600e\u4e48\u5b9e\u73b0\u7684\u5462?
\n\u8fd9 \u5c31\u8981\u4ece\u6570\u636e\u5757\u8bf4\u8d77,\u5728Oracle\u4e2d,\u5176\u6700\u5c0f\u7684\u903b\u8f91\u5355\u5143\u5c31\u662fblock,\u5728\u6bcf\u4e00\u4e2ablock\u5934\u90e8,\u90fd\u4fdd\u7559\u6709\u4e00\u4e2aITL\u7684\u4e8b\u52a1\u5217\u8868.\u6bcf\u5f53\u4e00\u4e2a\u4e8b\u52a1\u8981\u4fee\u6539 block\u4e2d\u6240\u4fdd\u7559\u7684\u884c\u7684\u65f6\u5019,\u5c31\u4f1a\u5728\u5728ITL\u7684SLOT\u4e2d\u8bb0\u5f55\u4e00\u9879.\u800c\u6bcf\u4e00\u884c\u7684\u884c\u9996\u8fd8\u6709\u4e00\u4e2aLock byte\u7528\u6765\u8868\u793a\u884c\u7684\u9501\u5b9a,\u56e0\u6b64\u672acommit\u7684\u4e8b\u52a1\u7528ITL\u7684slot\u548clock byte\u6765\u8868\u793a\u90a3\u4e9b\u88ab\u5c01\u9501\u7684\u884c.
\n\u521a\u624d\u8bf4\u8fc7,Oracle\u7684\u884c \u7ea7\u9501\u662fTX,\u662f\u4e8b\u52a1\u7ea7\u7684.\u5982\u679c\u4e00\u4e2a\u4e8b\u52a1\u8981\u4fee\u6539\u88ab\u53e6\u4e00\u4e2a\u4e8b\u52a1\u66f4\u65b0\u8fd8\u6ca1\u6709\u63d0\u4ea4\u7684\u6570\u636e\u65f6,\u4ed6\u5c31\u4f1a\u963b\u585e.\u7b49\u5f85\u9501\u7684\u91ca\u653e,\u4f46\u662f\u7b49\u5f85\u7684\u7edd\u5bf9\u4e0d\u662f\u884c\u7684\u9501,\u800c\u662f\u4e8b\u52a1\u9501 (TX)\u7684\u91ca\u653e.\u6240\u4ee5\u771f\u6b63\u7684TX\u9501\u91ca\u653e\u4e86(\u800c\u4e0d\u662f\u9690\u5f0f\u7684\u90a3\u4e9b\u884c).\u88ab\u963b\u585e\u7684\u4e8b\u52a1\u624d\u53ef\u4ee5\u7ee7\u7eed\u8fdb\u884c.\u6240\u4ee5\u5373\u4f7f\u4f60\u52a0\u4e86savepoint\u4e5f\u65e0\u7528,\u56de\u6eda\u5230\u67d0\u4e00\u4e2a savepoint\u53ea\u80fd\u91ca\u653e\u67d0\u4e9b\u9690\u5f0f\u884c\u4e0a\u7684\u9501,\u4f46\u662f\u4e0d\u80fd\u91ca\u653e\u771f\u6b63\u7684\u4e8b\u52a1\u9501. \u90a3\u4e48ITL\u4e2d\u7684SLOT\u7684\u6570\u91cf\u662f\u7531\u8c01\u51b3\u5b9a\u7684\u5462?\u5176\u5b9e\u4e00\u4e2aslot\u9879\u4e00\u822c\u4f1a\u5360\u7528block\u768424\u4e2a\u5b57\u8282,\u5728\u5efa\u5bf9\u8c61\u7684\u65f6\u5019\u4f1a\u901a\u8fc7\u6307\u5b9ainitrans\u548c maxtrans\u6765\u8bbe\u7f6eslot\u7684\u6570\u76ee.\u9700\u8981\u6ce8\u610f\u7684\u662fOracle 10g\u4e2d\u8fd9\u4e2amaxtrans\u7684\u8bbe\u7f6e\u5df2\u7ecf\u88ab\u5e9f\u5f03,\u610f\u601d\u662f\u8bf4,\u5373\u4f7f\u6211\u4eec\u6307\u5b9a\u4e86maxtrans,Oracle\u4e5f\u4f1a\u5ffd\u7565\u8fd9\u4e2a\u9650\u5236,\u53ea\u8981block\u6709\u7a7a \u95f4,Oracle\u5c31\u4f1a\u4e0d\u53d7\u7ea6\u675f\u7684\u6269\u5927ITL\u4e2d\u7684slot.<\/p>\n

2.TM(table level lock)
\n\u8868\u7ea7\u9501,\u5176\u5b9e\u5c31\u662f\u5411\u8868\u52a0 \u9501\u4e86(\u5e9f\u8bdd\u561b).\u90a3\u4e48\u5728\u5bf9\u4e00\u4e2a\u8868\u52a0\u9501\u4e4b\u524d,\u6570\u636e\u5e93\u9700\u8981\u505a\u4e00\u4e9b\u5224\u65ad,\u9996\u5148\u662f\u4ed6\u8981\u5bf9\u8868\u52a0\u7684\u8fd9\u4e2a\u9501\u662f\u5426\u4e0e\u8868\u4e2d\u6240\u52a0\u7684\u8fd9\u4e2a\u9501\u76f8\u5bb9.\u5176\u6b21,\u8fd8\u8981\u68c0\u67e5\u8be5\u9501\u662f\u5426\u4e0e\u8868\u4e2d\u7684 \u6bcf\u4e00\u884c\u4e0a\u7684\u9501\u76f8\u5bb9,\u5bf9\u4e8e\u8fd9\u4e00\u70b9\u5982\u679c\u6211\u4e00\u4e2a\u8868\u91cc\u9762\u6709\u5f88\u591a\u7684\u884c,\u90a3\u4e48\u5982\u679c\u6211\u8981\u5bf9\u4e00\u4e2a\u8868\u52a0\u9501\u7684\u8bdd,\u5c31\u9700\u8981\u904d\u5386\u8868\u4e2d\u7684\u6240\u6709\u884c,\u6765\u67e5\u770b\u9501\u7684\u76f8\u5bb9\u6027,\u8fd9\u5bf9\u6570\u636e\u5e93\u6765\u8bb2\u65e0 \u7591\u662f\u9ad8\u6027\u80fd\u7684\u4e00\u4e2a\u969c\u788d.\u6240\u4ee5\u5462,Oracle\u5f15\u51fa\u4e86\u4e00\u4e2a\u610f\u5411\u9501\u7684\u6982\u5ff5.
\n\u90a3\u4e48\u4ec0\u4e48\u662f\u610f\u5411\u9501\u5462?\u5982\u679c\u6211\u7ed9\u4e86\u4e00\u4e2a\u8282\u70b9\u52a0\u4e86\u4e00\u4e2a\u610f\u5411\u9501,\u5c31\u8868\u793a\u6211\u8981\u5bf9\u5176\u4e0b \u5c42\u8282\u70b9\u52a0\u4e00\u4e2a\u540c\u7b49\u7c7b\u578b\u7684\u9501,\u610f\u601d\u4e5f\u5c31\u662f\u8bf4\u8981\u5bf9\u4e00\u4e2a\u8282\u70b9\u52a0\u9501,\u5c31\u8981\u5148\u5728\u5176\u4e0a\u5c42\u8282\u70b9\u4e0a\u52a0\u4e2a\u610f\u5411\u9501,\u8fd9\u6837\u4e00\u6765,\u5982\u679c\u6211\u8981\u5bf9\u4e00\u4e2a\u8868\u52a0\u9501\u7684\u8bdd,\u90a3\u4e48\u53ea\u8981\u5224\u65ad\u548c\u610f\u5411\u9501 \u7684\u76f8\u5bb9\u6027\u5c31\u597d\u4e86,\u4e0d\u9700\u8981\u518d\u904d\u5386\u8868\u4e2d\u7684\u884c\u6765\u68c0\u67e5\u6bcf\u4e00\u884c\u7684\u9501\u4e86,\u8fd9\u6837\u7cfb\u7edf\u7684\u6548\u7387\u5c31\u5927\u5927\u63d0\u9ad8\u4e86.
\n\u610f\u5411\u9501\u6709\u90a3\u4e9b\u7c7b\u578b\u5462?
\n1.Intent share lock(\u610f\u5411\u5171\u4eab\u9501 IS):\u5982\u679c\u8981\u5bf9\u4e00\u4e2a\u5bf9\u8c61\u52a0S\u9501,\u90a3\u4e48\u9996\u5148\u5c31\u8981\u5728\u5176\u4e0a\u5c42\u8282\u70b9\u52a0IS\u9501
\n2.Intent exclusive lock(\u610f\u5411\u6392\u4ed6\u9501 IX):\u5982\u679c\u8981\u5bf9\u4e00\u4e2a\u5bf9\u8c61\u52a0X\u9501,\u9996\u5148\u4e5f\u8981\u5bf9\u5176\u4e0a\u7ea7\u8282\u70b9\u52a0IX\u9501.
\n3.Shared intent exclusive lock(\u5171\u4eab\u610f\u5411\u6392\u4ed6\u9501):\u5982\u679c\u4e00\u4e2a\u4e8b\u52a1\u5bf9\u67d0\u4e2a\u8868\u52a0\u4e86SIX\u9501\u7684\u8bdd,\u5219\u8868\u793a\u6574\u4e2a\u4e8b\u52a1\u8981\u8bfb\u53d6\u6574\u4e2a\u7684\u8868,\u540c\u65f6\u53c8\u4f1a\u66f4\u65b0\u4e2a\u522b\u884c.
\n\u8fd9\u6837\u6211\u4eec\u53ef\u4ee5\u603b\u7ed3\u4e00\u4e0b,\u5728\u5bf9\u6570\u636e\u5e93\u5bf9\u8c61\u52a0\u9501\u7684\u65f6\u5019\u5c31\u67095\u79cd
\nX , S , IX , IS , \u00a0SIX<\/p>\n

\u56e0\u6b64Oracle\u7684DML\u9501,\u5728\u884c\u7ea7\u53ea\u6709X\u9501,\u5728TM\u7ea7\u67095\u79cd\u5c31\u662f\u6211\u4eec\u521a\u521a\u63d0\u5230\u7684:X , S , IX , IS , SIX
\n\u8868\u793a\u8d77\u6765\u5c31\u662f,S , X , RS , RX , SRX<\/p>\n

\u6211 \u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u901a\u5e38\u7684DML\u64cd\u4f5c\uff08SELECT\u2026FOR UPDATE\u3001INSERT\u3001UPDATE\u3001DELETE\uff09\uff0c\u5728\u8868\u7ea7\u83b7\u5f97\u7684\u53ea\u662f\u610f\u5411\u9501\uff08RS\u6216RX\uff09\uff0c\u5176\u771f\u6b63\u7684\u5c01\u9501\u7c92\u5ea6\u8fd8\u662f\u5728\u884c\u7ea7\uff1b\u53e6\u5916\uff0cOracle\u6570 \u636e\u5e93\u7684\u4e00\u4e2a\u663e\u8457\u7279\u70b9\u662f\uff0c\u5728\u7f3a\u7701\u60c5\u51b5\u4e0b\uff0c\u5355\u7eaf\u5730\u8bfb\u6570\u636e\uff08SELECT\uff09\u5e76\u4e0d\u52a0\u9501\uff0cOracle\u901a\u8fc7\u56de\u6eda\u6bb5\uff08Rollback segment\uff09\u6765\u4fdd\u8bc1\u7528\u6237\u4e0d\u8bfb\u201c\u810f\u201d\u6570\u636e\u3002\u8fd9\u4e9b\u90fd\u6781\u5927\u5730\u63d0\u9ad8\u4e86\u7cfb\u7edf\u7684\u5e76\u53d1\u7a0b\u5ea6\u3002(\u64a4\u6d88\u5bf9\u8bfb\u53d6\u7684\u5757\u6240\u505a\u7684\u5757\u4fee\u6539)\u7531\u4e8e\u610f\u5411\u9501\u53ca\u6570\u636e\u884c\u4e0a\u9501\u6807\u5fd7\u4f4d\u7684\u5f15\u5165\uff0c\u6781 \u5927\u5730\u51cf\u5c0f\u4e86Oracle\u7ef4\u62a4\u884c\u7ea7\u9501\u7684\u5f00\u9500\uff0c\u8fd9\u4e9b\u6280\u672f\u7684\u5e94\u7528\u4f7fOracle\u80fd\u591f\u9ad8\u6548\u5730\u5904\u7406\u9ad8\u5ea6\u5e76\u53d1\u7684\u4e8b\u52a1\u8bf7\u6c42\u3002<\/p>\n

\u6700\u540e,\u7ed9\u51fa\u4e24\u4e2a\u8868\u683c\u662fIT PUBer\u7684\u670b\u53cb\u63d0\u4f9b\u7684:<\/p>\n

\n\n\n\n\n\n\n\n\n\n
\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>T2<\/span><\/span><\/p>\n

T1<\/span><\/span><\/p>\n<\/td>\n

\n

S<\/span><\/span><\/p>\n<\/td>\n

\n

X<\/span><\/span><\/p>\n<\/td>\n

\n

RS<\/span><\/span><\/p>\n<\/td>\n

\n

RX<\/span><\/span><\/p>\n<\/td>\n

\n

SRX<\/span><\/span><\/p>\n<\/td>\n

\n

–<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

S<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n

\n

N<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n

\n

N<\/span><\/span><\/p>\n<\/td>\n

\n

N<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

X<\/span><\/span><\/p>\n<\/td>\n

\n

N<\/span><\/span><\/p>\n<\/td>\n

\n

N<\/span><\/span><\/p>\n<\/td>\n

\n

N<\/span><\/span><\/p>\n<\/td>\n

\n

N<\/span><\/span><\/p>\n<\/td>\n

\n

N<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

RS<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n

\n

N<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

RX<\/span><\/span><\/p>\n<\/td>\n

\n

N<\/span><\/span><\/p>\n<\/td>\n

\n

N<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n

\n

N<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

SRX<\/span><\/span><\/p>\n<\/td>\n

\n

N<\/span><\/span><\/p>\n<\/td>\n

\n

N<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n

\n

N<\/span><\/span><\/p>\n<\/td>\n

\n

N<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

–<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n

\n

Y<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\u8868\u4e00\uff1a<\/span>Oracle<\/span>\u6570\u636e\u5e93<\/span>TM<\/span>\u9501\u7684\u76f8\u5bb9\u77e9\u9635<\/p>\n

<\/span><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n

SQL<\/strong><\/span><\/a><\/span><\/span>\u8bed\u53e5<\/span><\/p>\n<\/td>\n

\n

\u8868\u9501\u6a21\u5f0f<\/span><\/p>\n<\/td>\n

\n

\u5141\u8bb8\u7684\u9501\u6a21\u5f0f<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Select * from table_name\u2026\u2026<\/span><\/span><\/p>\n<\/td>\n

\n

\u65e0<\/span><\/p>\n<\/td>\n

\n

RS<\/span><\/span>\u3001<\/span>RX<\/span><\/span>\u3001<\/span>S<\/span><\/span>\u3001<\/span>SRX<\/span><\/span>\u3001<\/span>X<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Insert into table_name\u2026\u2026<\/span><\/span><\/p>\n<\/td>\n

\n

RX<\/span><\/span><\/p>\n<\/td>\n

\n

RS<\/span><\/span>\u3001<\/span>RX<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Update table_name\u2026\u2026<\/span><\/span><\/p>\n<\/td>\n

\n

RX<\/span><\/span><\/p>\n<\/td>\n

\n

RS<\/span><\/span>\u3001<\/span>RX<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Delete from table_name\u2026\u2026<\/span><\/span><\/p>\n<\/td>\n

\n

RX<\/span><\/span><\/p>\n<\/td>\n

\n

RS<\/span><\/span>\u3001<\/span>RX<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Select * from table_name for update<\/span><\/span><\/p>\n<\/td>\n

\n

RS<\/span><\/span><\/p>\n<\/td>\n

\n

RS<\/span><\/span>\u3001<\/span>RX<\/span><\/span>\u3001<\/span>S<\/span><\/span>\u3001<\/span>SRX<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

lock table table_name in row share mode<\/span><\/span><\/p>\n<\/td>\n

\n

RS<\/span><\/span><\/p>\n<\/td>\n

\n

RS<\/span><\/span>\u3001<\/span>RX<\/span><\/span>\u3001<\/span>S<\/span><\/span>\u3001<\/span>SRX<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

lock table table_name in row exclusive mode<\/span><\/span><\/p>\n<\/td>\n

\n

RX<\/span><\/span><\/p>\n<\/td>\n

\n

RS<\/span><\/span>\u3001<\/span>RX<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

lock table table_name in share mode<\/span><\/span><\/p>\n<\/td>\n

\n

S<\/span><\/span><\/p>\n<\/td>\n

\n

RS<\/span><\/span>\u3001<\/span>S<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

lock table table_name in share row exclusive mode<\/span><\/span><\/p>\n<\/td>\n

\n

SRX<\/span><\/span><\/p>\n<\/td>\n

\n

RS<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

lock table table_name in exclusive mode<\/span><\/span><\/p>\n<\/td>\n

\n

X<\/span><\/span><\/p>\n<\/td>\n

\n

\u65e0<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

\u8868\u4e8c\uff1a<\/span>Oracle<\/span>\u6570\u636e\u5e93<\/span>TM<\/span>\u9501\u5c0f\u7ed3<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

  \u9996\u5148\u4ec0\u4e48\u662f\u9501\u5462\uff1f\u53ef\u4ee5\u7406\u89e3\u4e3a\u4ed6\u662f\u5bf9\u4e00\u79cd\u5171\u4eab\u8d44\u6e90\u5e76\u53d1\u8bbf\u95ee\u7684\u4e00\u79cd\u63a7\u5236\uff1a\uff09 … \u7d9a\u304d\u3092\u8aad\u3080 →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[6],"tags":[50],"class_list":["post-343","post","type-post","status-publish","format-standard","hentry","category-oracle","tag-oracle-2"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/posts\/343","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/comments?post=343"}],"version-history":[{"count":0,"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/posts\/343\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/media?parent=343"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/categories?post=343"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/tags?post=343"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}