{"id":315220,"date":"2024-01-19T18:51:25","date_gmt":"2024-01-19T10:51:25","guid":{"rendered":"https:\/\/www.idc.net\/help\/315220\/"},"modified":"2024-01-19T18:51:25","modified_gmt":"2024-01-19T10:51:25","slug":"oracle%e6%95%b0%e6%8d%ae%e5%ba%93%e7%9a%84%e7%ae%a1%e7%90%86%e8%bf%90%e8%a1%8c%e6%8f%8f%e8%bf%b0","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/315220\/","title":{"rendered":"Oracle\u6570\u636e\u5e93\u7684\u7ba1\u7406\u8fd0\u884c\u63cf\u8ff0"},"content":{"rendered":"<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>\u4ee5\u4e0b\u7684\u6587\u7ae0\u4e3b\u8981\u662f\u4ece\u76f8\u5173\u7528\u6237\u7684\u8bf7\u6c42\u5f00\u59cb\u5165\u624b\u7684,Oracle\u6570\u636e\u5e93\u5b8c\u6574\u7684\u76f8\u5173\u5de5\u4f5c\u673a\u5236\u662f\u5982\u4f55\u8fd0\u884c\u5f97\u51fa\uff1f\u9996\u5148\u5982\u679c\u67d0\u4e2a\u7528\u6237\u76f8\u5173\u8fdb\u7a0b\u53d1\u51fa\u4e00\u4e2a\u76f8\u5173\u7684\u8fde\u63a5\u8bf7\u6c42\u7684\u8bdd,\u5982\u679c\u4f60\u6240\u4f7f\u7528\u7684\u662f\u4e3b\u673a\u547d\u540d\u6216\u8005\u662f\u672c\u5730\u670d\u52a1\u547d\u4e2d\u7684\u4e3b\u673a\u540d\u4f7f\u7528\u7684\u662f\u673a\u5668\u540d(\u975eIP\u5730\u5740)\u3002<\/p>\n<p>\u90a3\u4e48\u8fd9\u4e2a\u8bf7\u6c42\u90fd\u4f1a\u901a\u8fc7DNS\u670d\u52a1\u5668\u6216HOST\u6587\u4ef6\u7684\u670d\u52a1\u540d\u89e3\u6790\u7136\u540e\u4f20\u9001\u5230Oracle\u76d1\u542c\u8fdb\u7a0b,\u76d1\u542c\u8fdb\u7a0b\u63a5\u6536\u5230\u7528\u6237\u8bf7\u6c42\u540e\u4f1a\u91c7\u53d6\u4e24\u79cd\u65b9\u5f0f\u6765\u5904\u7406\u8fd9\u4e2a\u7528\u6237\u8bf7\u6c42,\u4e0b\u9762\u6211\u4eec\u5206\u4e13\u7528\u670d\u52a1\u5668\u548c\u5171\u4eab\u670d\u52a1\u5668\u5206\u522b\u91c7\u7528\u8fd9\u4e24\u79cd\u65b9\u5f0f\u65f6\u7684\u60c5\u51b5\u6765\u8bb2\uff1a<\/p>\n<p><strong>\u4e13\u7528\u670d\u52a1\u5668\u6a21\u5f0f\u4e0b\uff1a<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>\u4e00\u79cd\u65b9\u5f0f\u662f\u76d1\u542c\u8fdb\u7a0b\u63a5\u6536\u5230\u7528\u6237\u8fdb\u7a0b\u8bf7\u6c42\u540e\uff0c\u4ea7\u751f\u4e00\u4e2a\u65b0\u7684\u4e13\u7528\u670d\u52a1\u5668\u8fdb\u7a0b\uff0c\u5e76\u4e14\u5c06\u5bf9\u7528\u6237\u8fdb\u7a0b\u7684\u6240\u6709\u63a7\u5236\u4fe1\u606f\u4f20\u7ed9\u6b64\u670d\u52a1\u5668\u8fdb\u7a0b\uff0c\u4e5f\u5c31\u662f\u8bf4\u65b0\u5efa\u7684\u670d\u52a1\u5668\u8fdb\u7a0b\u7ee7\u627f\u4e86\u76d1\u542c\u8fdb\u7a0b\u7684\u4fe1\u606f\uff0c\u7136\u540e\u670d\u52a1\u5668\u8fdb\u7a0b\u7ed9\u7528\u6237\u8fdb\u7a0b\u53d1\u4e00\u4e2aRESEND\u5305\uff0c\u901a\u77e5\u7528\u6237\u8fdb\u7a0b\u53ef\u4ee5\u5f00\u59cb\u7ed9\u5b83\u53d1\u4fe1\u606f\u4e86\uff0c\u7528\u6237\u8fdb\u7a0b\u7ed9\u8fd9\u4e2a\u65b0\u5efa\u7684\u670d\u52a1\u5668\u8fdb\u7a0b\u53d1\u4e00\u4e2aCONNECT\u5305\uff0c\u670d\u52a1\u5668\u8fdb\u7a0b\u518d\u4ee5ACCEPT\u5305\u56de\u5e94\u7528\u6237\u8fdb\u7a0b\uff0c\u81f4\u6b64\uff0c\u7528\u6237\u8fdb\u7a0b\u6b63\u5f0f\u4e0e\u670d\u52a1\u5668\u8fdb\u7a0b\u786e\u5b9a\u8fde\u63a5\u3002<\/p>\n<p>\u6211\u4eec\u628a\u8fd9\u79cd\u8fde\u63a5\u53eb\u505aHAND-OFF\u8fde\u63a5\uff0c\u4e5f\u53eb\u8f6c\u6362\u8fde\u63a5\u3002\u53e6\u4e00\u79cd\u65b9\u5f0f\u662f\u76d1\u542c\u8fdb\u7a0b\u63a5\u6536\u5230\u7528\u6237\u8fdb\u7a0b\u7684\u8bf7\u6c42\u540e\u4ea7\u751f\u4e00\u4e2a\u65b0\u7684\u4e13\u7528\u670d\u52a1\u5668\u8fdb\u7a0b\uff0c\u8fd9\u4e2a\u670d\u52a1\u5668\u8fdb\u7a0b\u9009\u7528\u4e00\u4e2aTCP\/IP\u7aef\u53e3\u6765\u63a7\u5236\u4e0e\u7528\u6237\u8fdb\u7a0b\u7684\u4ea4\u4e92\uff0c\u7136\u540e\u5c06\u6b64\u4fe1\u606f\u56de\u4f20\u7ed9\u76d1\u542c\u8fdb\u7a0b\uff0c\u76d1\u542c\u8fdb\u7a0b\u518d\u5c06\u6b64\u4fe1\u606f\u4f20\u7ed9\u7528\u6237\u8fdb\u7a0b\u3002<\/p>\n<p>\u7528\u6237\u8fdb\u7a0b\u4f7f\u7528\u8fd9\u4e2a\u7aef\u53e3\u7ed9\u670d\u52a1\u5668\u8fdb\u7a0b\u53d1\u9001\u4e00\u4e2aCONNECT\u5305\uff0c\u670d\u52a1\u5668\u8fdb\u7a0b\u518d\u7ed9\u7528\u6237\u8fdb\u7a0b\u53d1\u9001\u4e00\u4e2aACCEPT\u5305\uff0c\u81f4\u6b64\uff0c\u7528\u6237\u8fdb\u7a0b\u53ef\u4ee5\u6b63\u5f0f\u5411\u670d\u52a1\u5668\u8fdb\u7a0b\u53d1\u9001\u4fe1\u606f\u4e86\u3002<\/p>\n<p>\u8fd9\u79cd\u65b9\u5f0f\u6211\u4eec\u53eb\u505a\u91cd\u5b9a\u5411\u8fde\u63a5\u3002HAND-OFF\u8fde\u63a5\u9700\u8981\u7cfb\u7edf\u5e73\u53f0\u5177\u6709\u8fdb\u7a0b\u7ee7\u627f\u7684\u80fd\u529b\uff0c\u4e3a\u4e86\u4f7fWINDOWS NT\/2000\u652f\u6301HAND-OFF\u5fc5\u987b\u5728HKEY_LOCAL_MACHINE&gt;SOFTWARE&gt;Oracle&gt;HOMEX\u4e2d\u8bbe\u7f6eUSE_SHARED_SOCKET\u3002<\/p>\n<p>&nbsp;<\/p>\n<p><strong>\u5171\u4eab\u670d\u52a1\u5668\u6a21\u5f0f\u4e0b\uff1a<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>\u53ea\u6709\u91cd\u5b9a\u5411\u8fde\u63a5\u7684\u65b9\u5f0f\uff0c\u5de5\u4f5c\u65b9\u5f0f\u662f\u76d1\u542c\u8fdb\u7a0b\u63a5\u6536\u5230\u7528\u6237\u8fdb\u7a0b\u7684\u8bf7\u6c42\u540e\u4ea7\u751f\u4e00\u4e2a\u65b0\u7684\u8c03\u5ea6\u8fdb\u7a0b\uff0c\u8fd9\u4e2a\u8c03\u5ea6\u8fdb\u7a0b\u9009\u7528\u4e00\u4e2aTCP\/IP\u7aef\u53e3\u6765\u63a7\u5236\u4e0e\u7528\u6237\u8fdb\u7a0b\u7684\u4ea4\u4e92\uff0c\u7136\u540e\u5c06\u6b64\u4fe1\u606f\u56de\u4f20\u7ed9\u76d1\u542c\u8fdb\u7a0b\uff0c\u76d1\u542c\u8fdb\u7a0b\u518d\u5c06\u6b64\u4fe1\u606f\u4f20\u7ed9\u7528\u6237\u8fdb\u7a0b\uff0c\u7528\u6237\u8fdb\u7a0b\u4f7f\u7528\u8fd9\u4e2a\u7aef\u53e3\u7ed9\u8c03\u5ea6\u8fdb\u7a0b\u53d1\u9001\u4e00\u4e2aCONNECT\u5305\uff0c\u8c03\u5ea6\u8fdb\u7a0b\u518d\u7ed9\u7528\u6237\u8fdb\u7a0b\u53d1\u9001\u4e00\u4e2aACCEPT\u5305\uff0c\u81f4\u6b64\uff0c\u7528\u6237\u8fdb\u7a0b\u53ef\u4ee5\u6b63\u5f0f\u5411\u8c03\u5ea6\u8fdb\u7a0b\u53d1\u9001\u4fe1\u606f\u4e86\u3002<\/p>\n<p>\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6eMAX_DISPIATCHERS\u8fd9\u4e2a\u53c2\u6570\u6765\u786e\u5b9a\u8c03\u5ea6\u8fdb\u7a0b\u7684***\u6570\u76ee\uff0c\u5982\u679c\u8c03\u5ea6\u8fdb\u7a0b\u7684\u4e2a\u6570\u5df2\u7ecf\u8fbe\u5230\u4e86***\uff0c\u6216\u8005\u5df2\u6709\u7684\u8c03\u5ea6\u8fdb\u7a0b\u4e0d\u662f\u6ee1\u8d1f\u8377\uff0c\u76d1\u542c\u8fdb\u7a0b\u5c06\u4e0d\u518d\u521b\u5efa\u65b0\u7684\u8c03\u5ea6\u8fdb\u7a0b\uff0c\u800c\u662f\u8ba9\u5176\u4e2d\u4e00\u4e2a\u8c03\u5ea6\u8fdb\u7a0b\u9009\u7528\u4e00\u4e2aTCP\/IP\u7aef\u53e3\u6765\u4e0e\u6b64\u7528\u6237\u8fdb\u7a0b\u4ea4\u4e92\u3002<\/p>\n<p>\u8c03\u5ea6\u8fdb\u7a0b\u6bcf\u63a5\u6536\u4e00\u4e2a\u7528\u6237\u8fdb\u7a0b\u8bf7\u6c42\u90fd\u4f1a\u5728\u76d1\u542c\u8fdb\u7a0b\u5904\u4f5c\u4e00\u4e2a\u767b\u8bb0\uff0c\u4ee5\u4fbf\u76d1\u542c\u8fdb\u7a0b\u80fd\u591f\u5747\u8861\u6bcf\u4e2a\u8c03\u5ea6\u8fdb\u7a0b\u7684\u8d1f\u8377\uff0c\u6240\u6709\u7684\u7528\u6237\u8fdb\u7a0b\u8bf7\u6c42\u5c06\u5206\u522b\u5728\u6709\u9650\u7684\u8c03\u5ea6\u8fdb\u7a0b\u4e2d\u6392\u961f\uff0c\u6240\u6709\u8c03\u5ea6\u8fdb\u7a0b\u518d\u987a\u5e8f\u7684\u628a\u5404\u81ea\u961f\u5217\u4e2d\u7684\u90e8\u5206\u7528\u6237\u8fdb\u7a0b\u8bf7\u6c42\u653e\u5165\u540c\u4e00\u4e2a\u8bf7\u6c42\u961f\u5217\u3002<\/p>\n<p>\u7b49\u5019\u591a\u4e2aOracle\u6570\u636e\u5e93\u7684\u5171\u4eab\u670d\u52a1\u5668\u8fdb\u7a0b\u8fdb\u884c\u5904\u7406\uff08\u53ef\u4ee5\u901a\u8fc7SHARED_SERVERS\u53c2\u6570\u8bbe\u7f6e\u5171\u4eab\u670d\u52a1\u5668\u8fdb\u7a0b\u7684\u4e2a\u6570\uff09\uff0c\u4e5f\u5c31\u662f\u8bf4\u6240\u6709\u7684\u8c03\u5ea6\u8fdb\u7a0b\u5171\u4eab\u540c\u4e00\u4e2a\u8bf7\u6c42\u961f\u5217\uff0c\u5171\u4eab\u670d\u52a1\u5668\u6a21\u5f0f\u4e0b\u4e00\u4e2a\u5b9e\u4f8b\u53ea\u6709\u4e00\u4e2a\u8bf7\u6c42\u961f\u5217\uff0c\u5171\u4eab\u670d\u52a1\u5668\u8fdb\u7a0b\u5904\u7406\u5b8c\u7528\u6237\u8fdb\u7a0b\u7684\u8bf7\u6c42\u540e\u5c06\u6839\u636e\u7528\u6237\u8fdb\u7a0b\u8bf7\u6c42\u53d6\u81ea\u4e0d\u540c\u7684\u8c03\u5ea6\u8fdb\u7a0b\u5c06\u8fd4\u56de\u7ed3\u679c\u653e\u5165\u4e0d\u540c\u7684\u54cd\u5e94\u961f\u5217\uff0c\u4e5f\u5c31\u662f\u8bf4\u6709\u591a\u5c11\u8c03\u5ea6\u8fdb\u7a0b\u5c31\u6709\u591a\u5c11\u54cd\u5e94\u961f\u5217\uff0c\u7136\u540e\u5404\u4e2a\u8c03\u5ea6\u8fdb\u7a0b\u4ece\u5404\u81ea\u7684\u54cd\u5e94\u961f\u5217\u4e2d\u5c06\u7ed3\u679c\u53d6\u51fa\u518d\u8fd4\u56de\u7ed9\u7528\u6237\u8fdb\u7a0b\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>\u4ee5\u4e0a\u6211\u4eec\u8bb2\u5b8c\u4e86\u7528\u6237\u4e0eOracle\u7684\u8fde\u63a5\u65b9\u5f0f\uff0c\u4e0b\u9762\u6211\u4eec\u8981\u8bb2Oracle\u670d\u52a1\u5668\u8fdb\u7a0b\u5982\u53ef\u5904\u7406\u7528\u6237\u8fdb\u7a0b\u7684\u8bf7\u6c42\uff0c\u5f53\u4e00\u4e2a\u7528\u6237\u8fdb\u7a0b\u53d1\u51fa\u4e86\u4e00\u6761SQL\u8bed\u540d\uff1aUPDATE TABBLEA SET SALARY=SALARY*2\uff1b\u9996\u5148\uff0c\u670d\u52a1\u5668\u8fdb\u7a0b\u628a\u8fd9\u6761\u8bed\u53e5\u7684\u5b57\u7b26\u8f6c\u6362\u6210ASCII\u7b49\u6548\u6570\u5b57\u7801\uff0c\u63a5\u7740\u8fd9\u4e2aASCII\u7801\u88ab\u4f20\u9012\u7ed9\u4e00\u4e2aHASH\u51fd\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2aHASH\u503c\uff0c\u670d\u52a1\u5668\u8fdb\u7a0b\u5c06\u5230SHARED POOL \u7684\u5171\u4eabPL\/SQL\u533a\u53bb\u67e5\u627e\u662f\u5426\u5b58\u5728\u540c\u6837\u7684HASH\u503c\u3002<\/p>\n<p>\u5982\u679c\u5b58\u5728\uff0c\u670d\u52a1\u5668\u8fdb\u7a0b\u5c06\u4f7f\u7528\u8fd9\u6761\u8bed\u53e5\u5df2\u9ad8\u901f\u7f13\u5b58\u5728SHARED POOL\u4e2d\u7684\u5df2\u5206\u6790\u8fc7\u7684\u7248\u672c\u6765\u6267\u884c\uff0c\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u670d\u52a1\u5668\u8fdb\u7a0b\u5c06\u5bf9\u8be5\u8bed\u53e5\u8fdb\u884c\u8bed\u6cd5\u5206\u6790\uff0c\u9996\u5148\u68c0\u67e5\u8be5\u8bed\u53e5\u7684\u8bed\u6cd5\u7684\u6b63\u786e\u6027\uff0c\u63a5\u7740\u5bf9\u8bed\u53e5\u4e2d\u6d89\u53ca\u7684\u8868\u3001\u7d22\u5f15\u3001\u89c6\u56fe\u7b49\u5bf9\u8c61\u8fdb\u884c\u89e3\u6790\uff0c\u5e76\u5bf9\u7167\u6570\u636e\u5b57\u5178\u68c0\u67e5\u8fd9\u4e9b\u5bf9\u8c61\u7684\u540d\u79f0\u4ee5\u53ca\u76f8\u5173\u7ed3\u6784\uff0c\u5e76\u6839\u636eOracle\u9009\u7528\u7684\u4f18\u5316\u6a21\u5f0f\u4ee5\u53ca\u6570\u636e\u5b57\u5178\u4e2d\u662f\u5426\u5b58\u5728\u76f8\u5e94\u5bf9\u8c61\u7684\u7edf\u8ba1\u6570\u636e\u548c\u662f\u5426\u4f7f\u7528\u4e86\u5b58\u50a8\u5927\u7eb2\u6765\u751f\u6210\u4e00\u4e2a\u6267\u884c\u8ba1\u5212\u6216\u4ece\u5b58\u50a8\u5927\u7eb2\u4e2d\u9009\u7528\u4e00\u4e2a\u6267\u884c\u8ba1\u5212\uff0c\u7136\u540e\u518d\u7528\u6570\u636e\u5b57\u5178\u6838\u5bf9\u6b64\u7528\u6237\u5bf9\u76f8\u5e94\u5bf9\u8c61\u7684\u6267\u884c\u6743\u9650\uff0c***\u751f\u6210\u4e00\u4e2a\u7f16\u8bd1\u4ee3\u7801\u3002<\/p>\n<p>Oracle\u6570\u636e\u5e93\u5c06\u8fd9\u6761\u8bed\u540d\u7684\u672c\u8eab\u5b9e\u9645\u6587\u672c\u3001HASH\u503c\u3001\u7f16\u8bd1\u4ee3\u7801\u3001\u4e0e\u6b64\u8bed\u540d\u76f8\u5173\u8054\u7684\u4efb\u4f55\u7edf\u8ba1\u6570\u636e\u548c\u8be5\u8bed\u53e5\u7684\u6267\u884c\u8ba1\u5212\u7f13\u5b58\u5728SHARED POOL\u7684\u5171\u4eabPL\/SQL\u533a\u3002\u670d\u52a1\u5668\u8fdb\u7a0b\u901a\u8fc7SHARED POOL \u9501\u5b58\u5668\u6765\u7533\u8bf7\u53ef\u4ee5\u5411\u54ea\u4e9b\u5171\u4eabPL\/SQL\u533a\u4e2d\u7f13\u5b58\u8fd9\u6b64\u5185\u5bb9\uff0c\u4e5f\u5c31\u662f\u8bf4\u88abSHARED POOL\u9501\u5b58\u5668\u9501\u5b9a\u7684PL\/SQL\u533a\u4e2d\u7684\u5757\u4e0d\u53ef\u88ab\u8986\u76d6\uff0c\u56e0\u4e3a\u8fd9\u4e9b\u5757\u53ef\u80fd\u88ab\u5176\u5b83\u8fdb\u7a0b\u6240\u4f7f\u7528\u3002<\/p>\n<p>\u5728SQL\u5206\u6790\u9636\u6bb5\u5c06\u7528\u5230LIBRARY CACHE\uff0c\u4ece\u6570\u636e\u5b57\u5178\u4e2d\u6838\u5bf9\u8868\u3001\u89c6\u56fe\u7b49\u7ed3\u6784\u7684\u65f6\u5019\uff0c\u9700\u8981\u5c06\u6570\u636e\u5b57\u5178\u4ece\u78c1\u76d8\u8bfb\u5165LIBRARY CACHE\uff0c\u56e0\u6b64\uff0c\u5728\u8bfb\u5165\u4e4b\u524d\u4e5f\u8981\u4f7f\u7528LIBRARY CACHE\u9501\u5b58\u5668\u6765\u7533\u8bf7\u7528\u4e8e\u7f13\u5b58\u6570\u636e\u5b57\u5178\u3002 \u751f\u6210\u7f16\u8bd1\u4ee3\u7801\u4e4b\u540e\uff0c\u63a5\u7740\u4e0b\u4e00\u6b65\u670d\u52a1\u5668\u8fdb\u7a0b\u8981\u51c6\u5907\u5f00\u59cb\u66f4\u65b0\u6570\u636e\uff0c\u670d\u52a1\u5668\u8fdb\u7a0b\u5c06\u5230DB BUFFER\u4e2d\u67e5\u627e\u662f\u5426\u6709\u76f8\u5173\u5bf9\u8c61\u7684\u7f13\u5b58\u6570\u636e\uff0c<\/p>\n<p>\u4e0b\u9762\u5206\u4e24\u4e2a\u53ef\u80fd\u8fdb\u884c\u89e3\u91ca\uff1a<\/p>\n<p>\u5982\u679c\u6ca1\u6709\uff0c\u670d\u52a1\u5668\u8fdb\u7a0b\u5c06\u5728\u8868\u5934\u90e8\u8bf7\u6c42\u4e00\u4e9b\u884c\u9501\uff0c\u5982\u679c\u6210\u529f\u52a0\u9501\uff0c\u670d\u52a1\u5668\u8fdb\u7a0b\u5c06\u4ece\u6570\u636e\u6587\u4ef6\u4e2d\u8bfb\u8fd9\u4e9b\u884c\u6240\u5728\u7684\u6570\u636e\u5757\u653e\u5165DB BUFFER\u4e2d\u7a7a\u95f2\u7684\u533a\u57df\u6216\u8005\u8986\u76d6\u5df2\u88ab\u6324\u51faLRU\u5217\u8868\u7684\u975e\u810f\u6570\u636e\u5757\u7f13\u51b2\u533a\uff0c\u5e76\u4e14\u6392\u5217\u5728LRU\u5217\u8868\u7684\u5934\u90e8\uff0c\u5982\u679c\u8fd9\u4e9b\u975e\u810f\u6570\u636e\u7f13\u51b2\u533a\u5199\u5b8c\u4e5f\u4e0d\u80fd\u6ee1\u8db3\u65b0\u6570\u636e\u7684\u8bf7\u6c42\u65f6\uff0c\u4f1a\u7acb\u5373\u89e6\u53d1DBWN\u8fdb\u7a0b\u5c06\u810f\u6570\u636e\u5217\u8868\u4e2d\u6307\u5411\u7684\u7f13\u51b2\u5757\u5199\u5165\u6570\u636e\u6587\u4ef6\uff0c\u5e76\u4e14\u6e05\u6d17\u6389\u8fd9\u4e9b\u7f13\u51b2\u533a\uff0c\u6765\u817e\u51fa\u7a7a\u95f4\u7f13\u51b2\u65b0\u8bfb\u5165\u7684\u6570\u636e\uff0c\u4e5f\u5c31\u662f\u5728\u653e\u5165DB BUFFER\u4e4b\u524d\u4e5f\u662f\u8981\u5148\u7533\u8bf7DB BUFFER\u4e2d\u7684\u9501\u5b58\u5668\u3002<\/p>\n<p>\u6210\u529f\u9501\u5b9a\u540e\uff0c\u518d\u5199\u5165DB BUFFER\uff0c\u7136\u540e\u670d\u52a1\u5668\u7a0b\u5c06\u8be5\u8bed\u53e5\u5f71\u54cd\u7684\u88ab\u8bfb\u5165DB BUFFER\u5757\u4e2d\u7684\u8fd9\u4e9b\u884c\u7684ROWID\u53ca\u5c06\u8981\u66f4\u65b0\u7684\u539f\u503c\u548c\u65b0\u503c\u53caSCN\u7b49\u4fe1\u606f\u9010\u6761\u7684\u5199\u5165REDO LOG BUFFER\uff0c\u5728\u5199\u5165REDO LOG BUFFER\u4e4b\u524d\u4e5f\u662f\u5148\u8bf7\u6c42REDO LOG BUFFER\u5757\u7684\u9501\u5b58\u5668\uff0c\u6210\u529f\u9501\u5b9a\u4e4b\u540e\u624d\u5f00\u59cb\u5199\u5165\uff0c\u5f53\u5199\u5165\u8fbe\u5230REDO LOG BUFFER\u5927\u5c0f\u7684\u4e09\u5206\u4e4b\u4e00\u6216\u5199\u5165\u91cf\u8fbe\u52301M\u6216\u8d85\u8fc7\u4e09\u79d2\u540e\u6216\u53d1\u751f\u68c0\u67e5\u70b9\u65f6\u6216\u8005DBWN\u4e4b\u524d\u53d1\u751f\uff0cLGWR\u5c06\u628aREDO LOG BUFFER\u4e2d\u7684\u6570\u636e\u5199\u5165\u78c1\u76d8\u4e0a\u7684\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\u3002<\/p>\n<p>\u5df2\u88ab\u5199\u5165\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\u7684REDO LOG BUFFER\u4e2d\u7684\u5757\u4e0a\u7684\u9501\u5b58\u5668\u88ab\u91ca\u653e\uff0c\u5e76\u53ef\u88ab\u540e\u6765\u5199\u5165\u7684\u4fe1\u606f\u6240\u8986\u76d6\uff0cREDO LOG BUFFER\u4ee5\u5faa\u73af\u7684\u65b9\u5f0f\u5de5\u4f5c\u3002\u5f53\u4e00\u4e2a\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\u5199\u6ee1\u540e\uff0cLGWR\u5c06\u5207\u6362\u5230\u4e0b\u4e00\u4e2a\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\uff0c\u5982\u679c\u662f\u5f52\u6863\u6a21\u5f0f\uff0c\u5f52\u6863\u8fdb\u7a0b\u8fd8\u5c06\u524d\u4e00\u4e2a\u5199\u6ee1\u7684\u91cd\u505a\u65e5\u5fd7\u8fdb\u7a0b\u5199\u5165\u5f52\u6863\u65e5\u5fd7\u6587\u4ef6\uff0c\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\u4e5f\u662f\u5faa\u73af\u5de5\u4f5c\u65b9\u5f0f\u3002\u5199\u5b8c\u6240\u6709\u7684REDO LOG BUFFER\u4e4b\u540e\uff0c\u670d\u52a1\u5668\u8fdb\u7a0b\u5f00\u59cb\u6539\u5199\u8fd9\u4e2aDB BUFFER\u5757\u5934\u90e8\u7684\u4e8b\u52a1\u5217\u8868\u5e76\u5199\u5165SCN\uff0c\u7136\u540eCOPY\u5305\u542b\u8fd9\u4e2a\u5757\u7684\u5934\u90e8\u4e8b\u52a1\u5217\u8868\u53caSCN\u4fe1\u606f\u7684\u6570\u636e\u526f\u672c\u653e\u5165\u56de\u6eda\u6bb5\u4e2d\uff0c\u6211\u4eec\u5c06\u56de\u6eda\u6bb5\u4e2d\u7684\u526f\u672c\u79f0\u4e3a\u6570\u636e\u5757\u7684\u201c\u524d\u6620\u50cf\u201d\u3002<\/p>\n<p>\uff08\u56de\u6eda\u6bb5\u53ef\u4ee5\u5b58\u50a8\u5728\u4e13\u95e8\u7684\u56de\u6eda\u8868\u7a7a\u95f4\u4e2d\uff0c\u8fd9\u4e2a\u8868\u7a7a\u95f4\u7531\u4e00\u4e2a\u6216\u591a\u4e2a\u7269\u7406\u6587\u4ef6\u7ec4\u6210\uff0c\u5e76\u4e13\u7528\u4e8e\u56de\u6eda\u8868\u7a7a\u95f4\uff0c\u56de\u6eda\u6bb5\u4e5f\u53ef\u5728\u5176\u5b83\u8868\u7a7a\u95f4\u4e2d\u7684\u6570\u636e\u6587\u4ef6\u4e2d\u5f00\u8f9f\u3002\uff09\u7136\u540e\u6539\u5199\u8fd9\u4e2aDB BUFFER\u5757\u7684\u6570\u636e\uff0c\u5e76\u5728\u5176\u5934\u90e8\u5199\u5165\u5bf9\u5e94\u7684\u56de\u6eda\u6bb5\u5730\u5740\uff0c\u5982\u679c\u5bf9\u4e00\u884c\u6570\u636e\u591a\u6b21UPDATE\u800c\u4e0dCOMMIT\u5219\u5728\u56de\u6eda\u6bb5\u4e2d\u5c06\u4f1a\u6709\u591a\u4e2a\u201c\u524d\u6620\u50cf\u201d\uff0c\u9664***\u4e2a\u201c\u524d\u6620\u50cf\u201d\u542b\u6709SCN\u4fe1\u606f\u5916\uff0c\u5176\u5b83\u7684\u6bcf\u4e2a\u201c\u524d\u6620\u50cf\u201d\u7684\u5934\u90e8\u8fd8\u542b\u6709SCN\u4fe1\u606f\u548c\u201c\u524d\u524d\u6620\u50cf\u201d\u7684\u56de\u6eda\u6bb5\u5730\u5740\u3002<\/p>\n<p>\u4e00\u6b21UPDATE\u64cd\u4f5c\u53ea\u5bf9\u5e94\u4e00\u4e2aSCN\u3002\u7136\u540e\u670d\u52a1\u5668\u8fdb\u7a0b\u5728\u810f\u6570\u636e\u5217\u8868\u4e2d\u5efa\u7acb\u4e00\u6761\u6307\u5411\u6b64\u7f13\u51b2\u5757\u7684\u6307\u9488\u3002\u63a5\u7740\u670d\u52a1\u5668\u8fdb\u7a0b\u4f1a\u4ece\u6570\u636e\u6587\u4ef6\u8bfb\u5165\u7b2c\u4e8c\u4e2a\u5757\u91cd\u590d\u4ee5\u4e0a\u8bfb\u5165\uff0c\u8bb0\u65e5\u5fd7\uff0c\u5efa\u7acb\u56de\u6eda\u6bb5\uff0c\u4fee\u6539\uff0c\u653e\u5165\u810f\u5217\u8868\u7684\u52a8\u4f5c\uff0c\u5f53\u810f\u6570\u636e\u5217\u8868\u8fbe\u5230\u4e00\u5b9a\u957f\u5ea6\u65f6\uff0cDBWN\u8fdb\u7a0b\u5c06\u810f\u6570\u636e\u5217\u8868\u4e2d\u6307\u5411\u7684\u7f13\u51b2\u5757\u5168\u90e8\u5199\u5165\u6570\u636e\u6587\u4ef6\uff0c\u4e5f\u5c31\u662f\u91ca\u653e\u52a0\u5728\u8fd9\u4e9bDB BUFER \u5757\u4e0a\u7684\u9501\u5b58\u5668\u3002\u5176\u5b9eOracle\u6570\u636e\u5e93\u53ef\u4ee5\u4e00\u6b21\u4ece\u6570\u636e\u6587\u4ef6\u4e2d\u8bfb\u5165\u51e0\u4e2a\u5757\u653e\u5165DB BUFFER\uff0c\u53ef\u4ee5\u901a\u8fc7\u53c2\u6570DB_FILE_MULTIBLOCK_READ_COUNT\u6765\u8bbe\u7f6e\u4e00\u6b21\u8bfb\u5165\u7684\u5757\u7684\u4e2a\u6570\u3002<\/p>\n<p>\u5982\u679c\u8981\u67e5\u627e\u7684\u6570\u636e\u5df2\u7f13\u5b58\uff0c\u5219\u6839\u636e\u7528\u6237\u7684SQL\u64cd\u4f5c\u7c7b\u578b\u51b3\u5b9a\u5982\u4f55\u64cd\u4f5c\uff0c\u5982\u679c\u662fSELECT \u5219\u67e5\u770bDB BUFFER\u5757\u7684\u5934\u90e8\u662f\u5426\u6709\u4e8b\u52a1\uff0c\u5982\u679c\u6709\uff0c\u5c06\u4ece\u56de\u6eda\u6bb5\u8bfb\u53d6\uff0c\u5982\u679c\u6ca1\u6709\u5219\u6bd4\u8f83SELECT \u7684SCN\u4e0eDB BUFFER\u5757\u5934\u90e8\u7684SCN\u5982\u679c\u6bd4\u81ea\u5df1\u5927\uff0c\u4ecd\u7136\u4ece\u56de\u6eda\u6bb5\u8bfb\u53d6\uff0c\u5982\u679c\u6bd4\u81ea\u5df1\u5c0f\u5219\u8ba4\u8fd9\u662f\u4e00\u4e2a\u975e\u810f\u7f13\u5b58\uff0c\u53ef\u4ee5\u76f4\u63a5\u4ece\u8fd9\u4e2aDB BUFFER\u5757\u4e2d\u8bfb\u53d6\u3002\u5982\u679c\u662fUPDATE\u5219\u5373\u4f7f\u5728DB BUFFER\u4e2d\u627e\u5230\u4e00\u4e2a\u6ca1\u6709\u4e8b\u52a1\uff0c\u800c\u4e14SCN\u6bd4\u81ea\u5df1\u5c0f\u7684\u975e\u810f\u7f13\u5b58\u6570\u636e\u5757\uff0c\u670d\u52a1\u5668\u8fdb\u7a0b\u4ecd\u7136\u8981\u5230\u8868\u7684\u5934\u90e8\u5bf9\u8fd9\u6761\u8bb0\u5f55\u7533\u8bf7\u52a0\u9501\uff0c\u52a0\u9501\u6210\u529f\u5219\u8fdb\u884c\u540e\u7eed\u52a8\u4f5c\uff0c\u5982\u679c\u4e0d\u6210\u529f\uff0c\u5219\u8981\u7b49\u5f85\u524d\u9762\u7684\u8fdb\u7a0b\u89e3\u9501\u540e\u624d\u80fd\u8fdb\u884c\u52a8\u4f5c\u3002<\/p>\n<p>\u53ea\u6709\u5f53SQL\u8bed\u53e5\u5f71\u54cd\u7684\u6240\u6709\u884c\u6240\u5728\u7684***\u4e00\u4e2a\u5757\u88ab\u8bfb\u5165DB BUFFER\u5e76\u4e14\u91cd\u505a\u4fe1\u606f\u88ab\u5199\u5165REDO LOG BUFFER\uff08\u4ec5\u662f\u6307\u91cd\u505a\u65e5\u5fd7\u7f13\u51b2\uff0c\u800c\u975e\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\uff09\u4e4b\u540e\uff0c\u7528\u6237\u624d\u53ef\u4ee5\u53d1\u51faCOMMIT\uff0cCOMMIT\u89e6\u53d1LGRW\uff0c\u4f46\u5e76\u4e0d\u5f3a\u5236\u7acb\u5373DBWN\u6765\u91ca\u653e\u6240\u6709\u76f8\u5e94\u7684DB BUFFER\u5757\u4e0a\u7684\u9501\uff0c\u4e5f\u5c31\u662f\u8bf4\u6709\u53ef\u80fd\u51fa\u73b0\u5df2COMMIT\uff0c\u4f46\u5728\u968f\u540e\u7684\u4e00\u6bb5\u65f6\u95f4\u5185DBWN\u8fd8\u5728\u5199\u8fd9\u6761\u8bed\u53e5\u6d89\u53ca\u7684\u6570\u636e\u5757\u7684\u60c5\u5f62\uff0c\u8868\u5934\u90e8\u7684\u884c\u9501\uff0c\u5e76\u4e0d\u662f\u5728COMMIT\u4e00\u53d1\u51fa\u5c31\u9a6c\u4e0a\u91ca\u653e\uff0c\u5b9e\u9645\u4e0a\u8981\u7b49\u5230\u76f8\u5e94\u7684DBWN\u8fdb\u7a0b\u7ed3\u675f\u624d\u4f1a\u91ca\u653e\u3002<\/p>\n<p>\u4e00\u4e2a\u7528\u6237\u8bf7\u6c42\u9501\u5b9a\u53e6\u4e00\u4e2a\u7528\u6237\u5df2COMMIT\u7684\u8d44\u6e90\u4e0d\u6210\u529f\u7684\u673a\u4f1a\u662f\u5b58\u5728\u7684\uff0c\u4eceCOMMIT\u5230DBWN\u8fdb\u7a0b\u7ed3\u675f\u4e4b\u95f4\u7684\u65f6\u95f4\u5f88\u77ed\uff0c\u5982\u679c\u6070\u5de7\u5728\u8fd9\u4e2a\u65f6\u95f4\u65ad\u7535\uff0c\u7531\u4e8eCOMMIT\u5df2\u89e6\u53d1LGWR\u8fdb\u7a0b\uff0c\u6240\u4ee5\u8fd9\u4e9b\u672a\u6765\u5f97\u53ca\u5199\u5165\u6570\u636e\u6587\u4ef6\u7684\u6539\u53d8\u4f1a\u5728\u5b9e\u4f8b\u91cd\u542f\u540e\u7531SMON\u8fdb\u7a0b\u6839\u636e\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\u6765\u524d\u6eda\u3002\u5982\u679c\u672aCOMMIT\u5c31\u65ad\u7535\uff0c\u7531\u4e8eDBWN\u4e4b\u524d\u89e6\u53d1LGWR\uff0c\u6240\u6709DBWN\u5728\u6570\u636e\u6587\u4ef6\u4e0a\u7684\u4fee\u6539\u90fd\u4f1a\u88ab\u5148\u4e00\u6b65\u8bb0\u5165\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\uff0c\u5b9e\u4f8b\u91cd\u542f\u540e\uff0cSMON\u8fdb\u7a0b\u518d\u6839\u636e\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\u6765\u56de\u6eda\u3002<\/p>\n<p>\u5982\u679c\u7528\u6237ROOLBACK\uff0c\u5219\u670d\u52a1\u5668\u8fdb\u7a0b\u4f1a\u6839\u636e\u6570\u636e\u6587\u4ef6\u5757\u548cDB BUFFER\u4e2d\u5757\u7684\u5934\u90e8\u7684\u4e8b\u52a1\u5217\u8868\u548cSCN\u4ee5\u53ca\u56de\u6eda\u6bb5\u5730\u5740\u627e\u5230\u56de\u6eda\u6bb5\u4e2d\u76f8\u5e94\u7684\u4fee\u6539\u524d\u7684\u526f\u672c\uff0c\u5e76\u4e14\u7528\u8fd9\u4e9b\u539f\u503c\u6765\u8fd8\u539f\u5f53\u524d\u6570\u636e\u6587\u4ef6\u4e2d\u5df2\u4fee\u6539\u4f46\u672a\u63d0\u4ea4\u7684\u6539\u53d8\u3002\u5982\u679c\u6709\u591a\u4e2a\u201c\u524d\u6620\u50cf\u201d\uff0c\u670d\u52a1\u5668\u8fdb\u7a0b\u4f1a\u5728\u4e00\u4e2a\u201c\u524d\u6620\u50cf\u201d\u7684\u5934\u90e8\u627e\u5230\u201c\u524d\u524d\u6620\u50cf\u201d\u7684\u56de\u6eda\u6bb5\u5730\u5740\uff0c\u4e00\u76f4\u627e\u5230\u540c\u4e00\u4e8b\u52a1\u4e0b\u7684\u6700\u65e9\u7684\u4e00\u4e2a\u201c\u524d\u6620\u50cf\u201d\u4e3a\u6b62\u3002\u4e00\u65e6\u53d1\u51fa\u4e86COMMIT\uff0c\u7528\u6237\u5c31\u4e0d\u80fdROOLBACK\uff0c\u8fd9\u4f7f\u5f97COMMIT\u540eDBWN\u8fdb\u7a0b\u8fd8\u6ca1\u6709\u5168\u90e8\u5b8c\u6210\u7684\u540e\u7eed\u52a8\u4f5c\u5f97\u5230\u4e86\u4fdd\u969c\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u4e0b\u9762\u6211\u4eec\u8981\u63d0\u5230\u68c0\u67e5\u70b9\u7684\u4f5c\u7528\uff0c\u5f53\u4e00\u4e2a\u5168\u90e8\u68c0\u67e5\u70b9\u53d1\u751f\u7684\u65f6\u5019\uff0c\u9996\u5148\u8ba9LGWR\u8fdb\u7a0b\u5c06REDO LOG BUFFER\u4e2d\u7684\u6240\u6709\u7f13\u51b2\uff08\u5305\u542b\u672a\u63d0\u4ea4\u7684\u91cd\u505a\u4fe1\u606f\uff09\u5199\u5165\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\uff0c\u7136\u540e\u8ba9DBWN\u8fdb\u7a0b\u5c06DB BUFFER\u4e2d\u6240\u6709\u5df2\u63d0\u4ea4\u7684\u7f13\u51b2\u5199\u5165\u6570\u636e\u6587\u4ef6\uff08\u4e0d\u5f3a\u5236\u5199\u672a\u63d0\u4ea4\u7684\uff09\u3002<\/p>\n<p>\u7136\u540e\u66f4\u65b0\u63a7\u5236\u6587\u4ef6\u548c\u6570\u636e\u6587\u4ef6\u5934\u90e8\u7684SCN\uff0c\u8868\u660e\u5f53\u524d\u6570\u636e\u5e93\u662f\u4e00\u81f4\u7684\uff0c\u5982\u679c\u5728\u53d1\u751f\u68c0\u70b9\u4e4b\u524d\u65ad\u7535\uff0c\u5e76\u4e14\u5f53\u65f6\u6709\u4e00\u4e2a\u672a\u63d0\u4ea4\u7684\u6539\u53d8\u6b63\u5728\u8fdb\u884c\uff0c\u5b9e\u4f8b\u91cd\u542f\u4e4b\u540e\uff0cSMON\u8fdb\u7a0b\u5c06\u4ece\u4e0a\u4e00\u4e2a\u68c0\u67e5\u70b9\u5f00\u59cb\u6838\u5bf9\u8fd9\u4e2a\u68c0\u67e5\u70b9\u4e4b\u540e\u8bb0\u5f55\u5728\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\u4e2d\u5df2\u63d0\u4ea4\u7684\u548c\u672a\u63d0\u4ea4\u6539\u53d8\uff0c\u56e0\u4e3aDBWN\u4e4b\u524d\u4f1a\u89e6\u53d1LGWR\uff0c\u6240\u4ee5DBWN\u5bf9\u6570\u636e\u6587\u4ef6\u7684\u4fee\u6539\u4e00\u5b9a\u4f1a\u88ab\u5148\u8bb0\u5f55\u5728\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\u4e2d\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u65ad\u7535\u524d\u88abDBWN\u5199\u8fdb\u6570\u636e\u6587\u4ef6\u7684\u6539\u53d8\u5c06\u901a\u8fc7\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\u4e2d\u7684\u8bb0\u5f55\u8fdb\u884c\u8fd8\u539f\uff0c\u53eb\u505a\u56de\u6eda\uff0c\u5982\u679c\u65ad\u7535\u65f6\u6709\u4e00\u4e2a\u5df2\u63d0\u4ea4\uff0c\u4f46DBWN\u52a8\u4f5c\u8fd8\u6ca1\u6709\u5b8c\u5168\u5b8c\u6210\u7684\u6539\u53d8\u5b58\u5728\uff0c\u56e0\u4e3a\u5df2\u7ecf\u63d0\u4ea4\uff0c\u63d0\u4ea4\u4f1a\u89e6\u53d1LGWR\u8fdb\u7a0b\uff0c\u6240\u4ee5\u4e0d\u7ba1DBWN\u52a8\u4f5c\u662f\u5426\u5df2\u5b8c\u6210\uff0c\u8be5\u8bed\u53e5\u5c06\u8981\u5f71\u54cd\u7684\u884c\u53ca\u5176\u4ea7\u751f\u7684\u7ed3\u679c\u4e00\u5b9a\u5df2\u7ecf\u8bb0\u5f55\u5728\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\u4e2d\u4e86\uff0c\u5219\u5b9e\u4f8b\u91cd\u542f\u540e\uff0cSMON\u8fdb\u7a0b\u6839\u636e\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\u8fdb\u884c\u524d\u6eda\u3002<\/p>\n<p>\u7531\u6b64\u53ef\u89c1\uff0c\u5b9e\u4f8b\u5931\u8d25\u540e\u7528\u4e8e\u6062\u590d\u7684\u65f6\u95f4\u7531\u4e24\u4e2a\u68c0\u67e5\u70b9\u4e4b\u95f4\u7684\u95f4\u9694\u5927\u5c0f\u6765\u51b3\u5b9a\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u4e2a\u56db\u4e2a\u53c2\u6570\u8bbe\u7f6e\u68c0\u67e5\u70b9\u6267\u884c\u7684\u9891\u7387\uff0cLOG_CHECKPOINT_INTERVAL\u51b3\u5b9a\u4e86\u4e24\u4e2a\u68c0\u67e5\u70b9\u4e4b\u95f4\u5199\u5165\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\u7684\u7cfb\u7edf\u7269\u7406\u5757\u7684\u5927\u5c0f\uff0cLOG_CHECKPOINT_TIMEOUT\u51b3\u5b9a\u4e86\u4e24\u4e2a\u68c0\u67e5\u70b9\u4e4b\u95f4\u7684\u65f6\u95f4\u957f\u5ea6\uff0cFAST_START_IO_TARGET\u51b3\u5b9a\u4e86\u7528\u4e8e\u6062\u590d\u65f6\u9700\u8981\u5904\u7406\u7684\u5757\u7684\u5927\u5c0f\uff0cFAST_START_MTTR_TARGET\u76f4\u63a5\u51b3\u5b9a\u4e86\u7528\u4e8e\u6062\u590d\u7684\u65f6\u95f4\u7684\u957f\u77ed\u3002<\/p>\n<p>SMON\u8fdb\u7a0b\u6267\u884c\u7684\u524d\u6eda\u548c\u56de\u6eda\u4e0e\u7528\u6237\u7684\u56de\u6eda\u662f\u4e0d\u540c\u7684\uff0cSMON\u662f\u6839\u636e\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\u8fdb\u884c\u524d\u6eda\u6216\u56de\u6eda\uff0c\u800c\u7528\u6237\u7684\u56de\u6eda\u4e00\u5b9a\u662f\u6839\u636e\u56de\u6eda\u6bb5\u7684\u5185\u5bb9\u8fdb\u884c\u56de\u6eda\u7684\u3002\u5728\u8fd9\u91cc\u6211\u4eec\u8981\u8bf4\u4e00\u4e0b\u56de\u6eda\u6bb5\u5b58\u50a8\u7684\u6570\u636e\uff0c\u5047\u5982\u662fdelete\u64cd\u4f5c\uff0c\u5219\u56de\u6eda\u6bb5\u5c06\u4f1a\u8bb0\u5f55\u6574\u4e2a\u884c\u7684\u6570\u636e\uff0c\u5047\u5982\u662fupdate,\u5219\u56de\u6eda\u6bb5\u53ea\u8bb0\u5f55\u88ab\u4fee\u6539\u4e86\u7684\u5b57\u6bb5\u7684\u53d8\u5316\u524d\u7684\u6570\u636e\uff08\u524d\u6620\u50cf\uff09\uff0c\u4e5f\u5c31\u662f\u6ca1\u6709\u88ab\u4fee\u6539\u7684\u5b57\u6bb5\u662f\u4e0d\u4f1a\u88ab\u8bb0\u5f55\u7684\uff0c\u5047\u5982\u662finsert\uff0c\u5219\u56de\u6eda\u6bb5\u53ea\u8bb0\u5f55\u63d2\u5165\u8bb0\u5f55\u7684rowid\u3002<\/p>\n<p>\u8fd9\u6837\u5047\u5982\u4e8b\u52a1\u63d0\u4ea4\uff0c\u90a3\u56de\u6eda\u6bb5\u4e2d\u7b80\u5355\u6807\u8bb0\u8be5\u4e8b\u52a1\u5df2\u7ecf\u63d0\u4ea4\uff1b\u5047\u5982\u662f\u56de\u9000\uff0c\u5219\u5982\u679c\u64cd\u4f5c\u662f\u662fdelete,\u56de\u9000\u7684\u65f6\u5019\u628a\u56de\u6eda\u6bb5\u4e2d\u6570\u636e\u91cd\u65b0\u5199\u56de\u6570\u636e\u5757\uff0c\u64cd\u4f5c\u5982\u679c\u662fupdate\uff0c\u5219\u628a\u53d8\u5316\u524d\u6570\u636e\u4fee\u6539\u56de\u53bb\uff0c\u64cd\u4f5c\u5982\u679c\u662finsert\uff0c\u5219\u6839\u636e\u8bb0\u5f55\u7684rowid \u628a\u8be5\u8bb0\u5f55\u5220\u9664\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u4e0b\u9762\u6211\u4eec\u8981\u8bb2DBWN\u5982\u4f55\u6765\u5199\u6570\u636e\u6587\u4ef6\uff0c\u5728\u5199\u6570\u636e\u6587\u4ef6\u524d\u9996\u5148\u8981\u627e\u5230\u53ef\u5199\u7684\u7a7a\u95f2\u6570\u636e\u5757\uff0cOracle\u4e2d\u7a7a\u95f2\u6570\u636e\u5757\u53ef\u4ee5\u901a\u8fc7FREELIST\u6216BITMAP\u6765\u7ef4\u62a4\uff0c\u5b83\u4eec\u4f4d\u4e8e\u4e00\u4e2a\u6bb5\u7684\u5934\u90e8\u7528\u6765\u6807\u8bc6\u5f53\u524d\u6bb5\u4e2d\u54ea\u4e9b\u6570\u636e\u5757\u53ef\u4ee5\u8fdb\u884cINSERT\u3002<\/p>\n<p>\u5728\u672c\u5730\u7ba1\u7406\u8868\u7a7a\u95f4\u4e2dOracle\u6570\u636e\u5e93\u81ea\u52a8\u7ba1\u7406\u5206\u914d\u7ed9\u6bb5\u7684\u533a\u7684\u5927\u5c0f\uff0c\u533a\u7684\u5206\u914d\u4fe1\u606f\u5b58\u50a8\u5728\u7ec4\u6210\u8868\u7a7a\u95f4\u7684\u6570\u636e\u6587\u4ef6\u7684\u5934\u90e8\uff0c\u800c\u6570\u636e\u5b57\u5178\u7ba1\u7406\u7684\u8868\u7a7a\u95f4\u7528\u6237\u53ef\u4ee5\u5728\u521b\u5efa\u65f6\u51b3\u5b9a\u533a\u7684\u5927\u5c0f\uff0c\u5e76\u4e14\u533a\u7684\u5206\u914d\u4fe1\u606f\u662f\u5b58\u50a8\u5728\u6570\u636e\u5b57\u5178\u4e2d\u7684\uff0c\u53ea\u5728\u672c\u5730\u7ba1\u7406\u7684\u8868\u7a7a\u95f4\u4e2d\u624d\u80fd\u9009\u7528\u6bb5\u81ea\u52a8\u7ba1\u7406\uff0c\u91c7\u7528\u81ea\u52a8\u6bb5\u7a7a\u95f4\u7ba1\u7406\u7684\u672c\u5730\u7ba1\u7406\u8868\u7a7a\u95f4\u4e2d\u7684\u6bb5\u4e2d\u7684\u7a7a\u95f2\u6570\u636e\u5757\u7684\u4fe1\u606f\u5c31\u5b58\u653e\u5728\u6bb5\u7684\u5934\u90e8\u5e76\u4e14\u4f7f\u7528\u4f4d\u56fe\u6765\u7ba1\u7406\uff0c\u91c7\u7528\u624b\u52a8\u7ba1\u7406\u7684\u672c\u5730\u7ba1\u7406\u8868\u7a7a\u95f4\u4e2d\u7684\u6bb5\u548c\u6570\u636e\u5b57\u5178\u7ba1\u7406\u7684\u8868\u7a7a\u95f4\u4e2d\u7684\u6bb5\u4e2d\u7684\u7a7a\u95f2\u6570\u636e\u5757\u7684\u7ba1\u7406\u90fd\u4f7f\u7528\u4f4d\u4e8e\u6bb5\u5934\u90e8\u7684\u7a7a\u95f2\u5217\u8868\u6765\u7ba1\u7406\uff0c<\/p>\n<p>\u7a7a\u95f2\u5217\u8868\u7684\u5de5\u4f5c\u65b9\u5f0f\uff1a<\/p>\n<p>\u9996\u5148\u4e00\u4e2a\u7a7a\u7684\u6570\u636e\u5757\u88ab\u52a0\u5165\u7a7a\u95f2\u5217\u8868\uff0c\u5f53\u5176\u4e2d\u7a7a\u95f2\u7a7a\u95f4\u5c0f\u4e8ePCTFREE\u8bbe\u7f6e\u7684\u503c\u4e4b\u540e\uff0c\u8fd9\u4e2a\u5757\u4ece\u7a7a\u95f2\u5217\u8868\u5220\u9664\uff0c\u5f53\u8fd9\u4e2a\u5757\u4e2d\u7684\u5185\u5bb9\u964d\u81f3PCTUSED\u8bbe\u7f6e\u7684\u503c\u4e4b\u4e0b\u540e\uff0c\u8fd9\u4e2a\u6570\u636e\u5757\u88ab\u518d\u6b21\u52a0\u5165\u7a7a\u95f2\u5217\u8868\uff0c\u4f4d\u4e8e\u7a7a\u95f2\u5217\u8868\u4e2d\u7684\u6570\u636e\u5757\u90fd\u662f\u53ef\u4ee5\u5411\u5176\u4e2dINSERT\u7684\u5757\uff0c\u5f53\u4e00\u4e2a\u5757\u79fb\u51fa\u4e86\u7a7a\u95f2\u5217\u8868\uff0c\u4f46\u53ea\u8981\u5176\u4e2d\u8fd8\u6709\u4fdd\u7559\u7a7a\u95f4\u5c31\u53ef\u4ee5\u8fdb\u884cUPDATE\uff0c\u5f53\u5bf9\u5176\u4e2d\u4e00\u884cUPDATE\u4e00\u4e2a\u5927\u6570\u636e\u65f6\uff0c\u5982\u679c\u5f53\u524d\u5757\u4e0d\u80fd\u5b8c\u5168\u653e\u4e0b\u6574\u4e2a\u884c\uff0c\u53ea\u4f1a\u628a\u6574\u4e2a\u884c\u8fc1\u79fb\u5230\u4e00\u4e2a\u65b0\u7684\u6570\u636e\u5757\uff0c\u5e76\u5728\u539f\u5757\u4f4d\u7f6e\u7559\u4e0b\u4e00\u4e2a\u6307\u5411\u65b0\u5757\u7684\u6307\u9488\uff0c\u8fd9\u53eb\u884c\u8fc1\u79fb\u3002<\/p>\n<p>\u5982\u679c\u4e00\u4e2a\u6570\u636e\u5757\u53ef\u4ee5INSERT\uff0c\u5f53\u63d2\u5165\u4e00\u4e2a\u5f53\u524d\u5757\u88c5\u4e0d\u4e0b\u7684\u884c\u65f6\uff0c\u8fd9\u4e2a\u884c\u4f1a\u6ea2\u51fa\u5230\u4e24\u4e2a\u6216\u4e24\u4e2a\u51e0\u4e0a\u7684\u5757\u4e2d\uff0c\u8fd9\u53eb\u884c\u94fe\u63a5\u3002\u5982\u679c\u7528\u6237\u7684\u52a8\u4f5c\u662fINSERT \u5219\u670d\u52a1\u5668\u8fdb\u7a0b\u4f1a\u5148\u9501\u5b9aFREELIST\uff0c\u7136\u540e\u627e\u5230\u7a7a\u95f2\u5757\u7684\u5730\u5740\uff0c\u518d\u91ca\u653eFREELIST\uff0c\u5f53\u591a\u4e2a\u670d\u52a1\u5668\u8fdb\u7a0b\u540c\u65f6\u60f3\u8981\u9501\u5b9aFREELIST\u65f6\u5373\u53d1\u751fFREELIST\u7684\u4e89\u7528\uff0c\u53ef\u4ee5\u5728\u975e\u91c7\u7528\u81ea\u52a8\u6bb5\u7a7a\u95f4\u7ba1\u7406\u7684\u8868\u7a7a\u95f4\u4e2d\u521b\u5efa\u8868\u65f6\u6307\u5b9aFREELIST\u7684\u4e2a\u6570\u3002<\/p>\n<p>\u9ed8\u8ba4\u4e3a1\uff0c\u5982\u679c\u662f\u5728\u91c7\u7528\u81ea\u52a8\u6bb5\u7a7a\u95f4\u7ba1\u7406\u7684\u8868\u7a7a\u95f4\u4e2d\u521b\u5efa\u8868\uff0c\u5373\u4f7f\u6307\u5b9a\u4e86FREELIST\u4e5f\u4f1a\u88ab\u5ffd\u7565\uff0c\u56e0\u4e3a\u6b64\u65f6\u5c06\u4f7f\u7528BITMAP\u800c\u4e0d\u662fFREELIST\u6765\u7ba1\u7406\u6bb5\u4e2d\u7684\u7a7a\u95f2\u7a7a\u95f4\u3002\u5982\u679c\u7528\u6237\u52a8\u4f5c\u662fUPDATE\u670d\u52a1\u5668\u8fdb\u7a0b\u5c06\u4e0d\u4f1a\u4f7f\u7528\u5230FREELIST\u548cBITMAP\uff0c\u56e0\u4e3a\u4e0d\u8981\u53bb\u5bfb\u627e\u4e00\u4e2a\u7a7a\u95f2\u5757\uff0c\u800c\u4f7f\u7528\u9501\u7684\u961f\u5217\u3002<\/p>\n<p>\u3010\u7f16\u8f91\u63a8\u8350\u3011<\/p>\n<ol>\n<li>Oracle \u67e5\u8be2\u8bb0\u5f55\u76f8\u5173\u6548\u7387\u7684\u67e5\u8be2<\/li>\n<li>Oracle\u5e76\u53d1\u8fde\u63a5\u6570\u7684\u8bbe\u7f6e\u65b9\u6848<\/li>\n<li>Oracle\u5b58\u53d6LONG\u7c7b\u578b\u5b57\u6bb5\u7684\u65b9\u6848\u63cf\u8ff0<\/li>\n<li>Oracle\u5b58\u53d6LONG\u7c7b\u578b\u5b57\u6bb5\u7684\u65b9\u6848\u63cf\u8ff0<\/li>\n<li>Oracle\u67e5\u8be2\u4f18\u53164\u5927\u65b9\u9762\u7684\u4e3b\u8981\u9014\u5f84<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; &nbsp; \u4ee5\u4e0b\u7684\u6587\u7ae0\u4e3b\u8981\u662f\u4ece\u76f8\u5173\u7528\u6237\u7684\u8bf7\u6c42\u5f00\u59cb\u5165\u624b\u7684,Oracle\u6570\u636e\u5e93\u5b8c\u6574\u7684\u76f8\u5173\u5de5\u4f5c\u673a\u5236\u662f [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7038],"tags":[],"class_list":["post-315220","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/315220","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=315220"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/315220\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=315220"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=315220"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=315220"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}