经常会听到一些开发的朋友说,Update语句的操作原理是:先删后加!今天偶然想起这句话,索性验证一下。参考下面示例:

USE CSDN
go --新添加一个文件组和文件
ALTER DATABASE CSDN
ADD FILEGROUP fg20140313
go ALTER DATABASE CSDN
ADD FILE
(
NAME = 'fg20140313',
FILENAME = 'd:\db\fg20140313.ndf'
) TO FILEGROUP fg20140313
go --创建测试表:UpdatePage
IF OBJECT_ID('dbo.UpdatePage', 'U') IS NOT NULL
DROP TABLE dbo.UpdatePage
GO CREATE TABLE dbo.UpdatePage
(
id INT IDENTITY(1,1) NOT NULL PRIMARY KEY,
NAME CHAR(10),
remark NVARCHAR (200)
) ON fg20140313
GO --插入2条测试数据
INSERT dbo.UpdatePage VALUES('Shawn' , 'This is a test' )
INSERT dbo.UpdatePage VALUES('Lucy' , 'That is a test' ) --此表分配的页情况如下:UpdatePage表分配了一个IAM页(3:9)和一个数据页(3:8)
DBCC TRACEON (3604)
DBCC IND(CSDN, UpdatePage, 1) 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" alt="" />
图1.

--我们直接看一下8号页上的数据情况,此面包含的2条记录槽号偏移量分别是:96,149 (10进制表示)
 DBCC PAGE (CSDN, 3, 8 , 2)
aaarticlea/png;base64,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" alt="" />
图2.1 --停止SQL SERVER服务,把d:\db\fg20140313.ndf文件Copy出来,用WinHex查看,可以根据槽号来验证一下2条记录的存储位置
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HdH/hfsb9JYS+1xIzCxuf+slXItwoHqq8qnPnud5988smjR48+9dRTp0+fLhaLa2trjUZjMBiY4Q8i6sAf6CBo91bjD+INPvYECB2SXM7zVSzxdxol81MXnHB/kOHef0A8cAz0B3uNRvWXLtv+9V8bDAatVqtcLi8vL8/Ozl64cOHixYuLi4vss/xc7kH2fQT7g4PAOeLwB5yetlHorqzUP/yhXiE/LOTrr3vN3D/c8uKLL546derIkSMnT5586qmnzp49u7i4WK1We72e57sMls5njsTKroanB/1P5/AHREFRKeIQHfwB0a/T9TUUnEB/wN4H/IHN6Jj6zzzT/NlD9Ruu3d7eXltbm5ubKxaLxWJxbm5udXW1Uqm0Wq1s9mHn1wGIJiCWJj+79Xr3G3+3/cZftA7nh4V8/crfrPzrM6urq+fPn3/22WePHDny6KOPPvHEE6dPn56bmyuXy51OZ3d3d2zOHKP6y+WT/qcH/XeKSn/guT/R6Q80CT4JfxCjOfAPkXzLjr1DD09uG2oiOJn+wGMRIvoDes9x8geWZXWfe67xK2+uvfuK1TtuLxaL586dm5mZWVhY2NjYaDQa7LJBJnOC3U8w8rOAGJucr3tad4vnO1/+YvXy17PHMdTe8bbud/6RXfnY2Ni4cOHC888/f/To0ZH+wLKsjANfMIFNHBIV9ORTUFOKERKD1zPCFAXZSL8/8Nyi6Lk/UZPgk0gAiSbRCDOj4Eg4/QFnlNz71VBwAtdHsv/It9x3KVqON+v5//7YjKeDsyno/xzBRInBH+zs7DTK5cp//0z9stdW3vmOxRu/PPfM0ysrK5z7+1QyLBa7R4/U3ntls5C3Lj3YKeQbv31l95//aafdZrdN1Ov1tbW1mZmZ06dP33zzzY8//vipU6fOnj27sLBQrVa73a7/8wUA0iTAHxC/3wiSJTPi/kSzwfrKjqsIRhGPP/jJzQdnfrT6mU+V3/T66mtetfWuKyr/8y+aDx0brK2pPr/u7e0uLvbvvqv52U9Xr3h7t5C3Lj04KOS33/mr7S/91c6LZ9iXIdmNirVabWNjY2Fh4dy5c6dPn77llluefvpp9hWGUqlUr9f7/X66/gYAL/AHOmPkiYIL/AH8QeBbHw6H7Xa7Wq2ura2xBYiW7/ze1jVXV978xuqhA1uHDpTfcnnt/Vc1b/xy587v9Z99dnd5aa/Tjid8y7KGw72trcGPz/Z+cG/7f3+t/oGrKm9+Q3v/mc5br311/X1/2P3G3w32bYG9sGOtVmNfdFxYWCgWi2fPnn3hhRe+853vnDlz5vz580tLS2wJhNSvfwDgBf5AZ4w8UXCBP4A/4PmDXq/XbDbL5TJbpnBpaWl1dXVjY6N6+vT2zUe3r/lw5R3/cfPwwUEhv1vItwr59Z87vHX5Gyq/8Z7tq/6ocd3Hml/4fOumv+ncfLR72629u+/qP3Ssd/zh/uOP9Z/84eDJH/Z/+ETv+CO9Rx7q3XtP55++2/7mN5pf+VLjhmu3//gPy7/2nzYve13l0IHdQt46nN8p5Lde/bPb73l387qPd/7h24MXXtip19miSexqAXuOA1sriS2BMD8/by+nePbs2dtuu21mZmZpaalcLrdaLc/6SABogZGlyBgmb+9Mmj+YHGLwB3t7ezs7O51Op16vs7/IS6VSqVRaW1vb2Ngol8vsgQv1lZX606cat9+2/bW/rnzog9X3Xrn51rdsvu415UMH2oX8sJC3Do/42Tuc32P/KeT3Dud3C/lOIV89dGD9VYWtN/xi5V1XbL/vj5qf/XTryP/rPnys/8rLO7Wa/QhptiaSfwnFUqm0tLQ0Pz9/4cKFYrH4yiuvvPzyy+fOnSsWi3fffXepVGJfu2B3VuLiAdCOyTsDjROTt3fgD0wlnuc3smcydTodtu4Qe+SBzfr6+sbGhvMRDPbzmdjDmdizntv7sKWX2bMYGH0fzmcxsKcwBD2CoVwub25uMluwvLy8sLAwNzfHnsJgc/HiRbaa07Fjx7a3t9vtNswB0BfO9U38aPIzScAfmEo8/sB+bCN7FnOtVqtUKrZLKJVKq6urq6ur7KKC7Rg2Nzdt08B8g+fpjuw5jc0AnI9wdD6/kRkC9ghH55OZ5ufn2dpNMzMzMzMzFy5cmJ2dnZ+fX1xcLJVKm5ub1Wr15MmT3W6X//BGAFIm9ZMffkJ/Jgn4A1OJxx9YjqUJ+/1+u91mz2+0XUKpVFpZWVleXl5ysLy8vLKy4rEOzD3Y1sHvHpgJYD5ga2uLWQH7WVDOiRYWFtjVgtnZ2dnZ2YsXL87Ozs7NzbG1n9lNEuvr6+VyeXt7u9lsdjqdJ598EpcNAACADvyBqcTmDxjsEc/2/YDNZtP+4J/9Qb+6urq8vLy4uLiwz/w+9itO6+D0DR7YZQn2IChbkEnN7eNUZrKrq6vOGyPsB0MMBoPhcHjq1CnpTQkAABMI/IGpxOwPrFEPQ2LfGsjl7puaundq6h7nlf/p6e9NT98xPX37JZf85Md2CYuLi0tLS9PT35uevnN6+s5VBysrK/ZFgunpOxbcTE/fPj19x/T0HWwUcxj2NQn2+UWj0Wi1WuypEOwxkuyaASfROUuAya0OBsFEBe0OdDWVEWZ8CMWpIHhihOkmgHNgLIKTFiF/LxMFDfYH/O1D6S80MEqc0mM5xO8PGOzZjPaSA9nsQ56vErAPCKam7rbtgof19fWpqbs2NjbYnQoe2OtTU3dNTd3lHDU19X3nzQ1TU/eyjyRqtRrzBPZjJG1b4Pw0ISjR/YcNpYkDBBMVtKQWIk3xLUcn6eCD+gidioJ+lYuQ01OTFNU/wlgEzfYH0v1Fj/eEzvFRSMof2Ozt7WUyJ4bDoX1Fwf7aYbPZzOXud95d6CSX+wH7W9+mVquxzoxc7j67m3OU8/bGXO5B9oUI9iUI5gk49x4SEz2WwhGvIH3UWFcioqCoVEIRcvQN8AesQ4r+gJ7kmqSohhHSh8AfJD12Ev2BZVn2Q5Lsjx4c1xUeZl9QbPvI5Y75X3SSzR7zd8tmj7GvR/b7/cFgkM0eZ9MRv48Af0AR1KS0wR8EifPngj9AhBRxeiv8QSxj7QNKtGqJDnGO4o9V5w/8D1RklxYymROZzKOZzKPZ7KPDfXZ2drLZ4+xf9rPjxn7FOYqxr3kikzkhGiol0fnHYfTDMqGTpWgawR/EVXxHbnni8Sk0S9Cv0puXE6H9SuoZxYlQk5wPSgBPqKlEGNqfsg3N9gfSx6lEf4nDSqI/53D2oMgfOG2B/2HNI5s4ozhq/F9DoTyolP9K9P2a3MkyLsHYI0zuLUc5bGIsvqGjolsElcFzxFVG6CnZeqYoX8TuoK0/oHQw2B94iHgapvdX7A+CUPr5wshfg5o4o+xLEf5rEon6A8oZKPp+gj+AP4gunrQ/8JBKhGMtyO+pLEJ6Z/gDyxR/YPkO4aBuY+kP6OIx+oOgjSh9WMYrqH8lgj8wxh/IqY11Rpl6VNI7wx9YBvkD4vCU/YFcE1GcMyoI4vcbOU1yx3nsguNVK031B0mfsxOdizgK/kBOUEItiQjpUU2mP0jadQX1T9Qf+Dun6Q8syxr5WUCUJk8HoVEcOP7AQ1ArcaLYBfmjJlxQbr+ojJAuqHKu0FHmbd5UBOlqCUUoMZcTg/2BFUd5FxpiCSaGxFz0UYr8wbhgdqIDAEDsoGyaCvyBCyQ6AAAIgbJpKvAHLpDoAAAgBMqmqcAfuECiAwCAECibpgJ/4AKJDgAAQqBsmgr8gQskOgAACIGyaSrwBy6Q6AAAIATKpqnAH7hAogMAgBAom6YCf+ACiQ4AAEKgbJqKOn8QutYhfwlFoqCng2iQ/OcvxL5smeaCVvBKXjpEmPGhW4RJCCqeiz9KWk3bzRuvYMZHULe0IvQMlAjeSskfiL5HIIG69ZWFXg9tDT33x76+ctCvnCZueLoLcnpqEuEECiqei9NT7tQbb4RjLeh8UXqPqDzMOeD6QbokZ5VSeD5Tok3ODjr7A46+nqWNOJfKCOlDdIgwCUGOQqIJICoVGoYmm1d9irIXU/QH9MOcA/xBusAfUJucHeAPYhQkzqUyQvoQHSJMQpCjAH8gIQh/IKFgKfcHmX3kRkmMFSWViUSnowxR5w8o9x/QRwU12a3O/9BJxR/wFdL1ByNzyCOeevEN6i96zOi/l+X0Y08AUamEIiSK0wUVp6j9Yoopyj/MiSce/e8/8HdO+sytciKJbCTWcEX+wHmqJl4Y4IziN1EmCkK9PwhN3BT9AV/E7qBn8ZUQ1H8v06dIOgGEpBKKkNNfk4OIGGG6/oAYCadpHP1BotCtVVzTReyfsj/g/BrUxBnFb+J/IYKPYn9Aqbkp+gPiqHSLL6WzhhGOhT8IHaWDP9D5IOJHKHEW0fMw198fWArP2bEf2qIzUvoT0880f0CcKAiV/iCopyalDf5Aw71Mn2hC/IHmBxGxs/T71eQwHwt/EO9wurKe/oDYM2V/EHsT5XUOaX2/kTgXXVBZ4UixtNGj0mQbRo+QPtck+AP9DyJiTz39AV1Qf3/g72yqPyDmm2dI0Ch16x+EroAUV5Ong1CcytZHyviIKBh7hERBulpCEUrMpSzCJPaysuDpgnIbJHqESWzeJLYhccYUI4womNb3F6Jki7IILVUWQXq/c/pgfWUX+CIvAAAIgbJpKvAHLpDoAAAgBMqmqcAfuECiAwCAECibpgJ/4AKJDgAAQqBsmgr8gQskOgAACIGyaSrwBy6Q6AAAIATKpqnAH7hAogMAgBAom6YCf+ACiQ4AAEKgbJoK/IELJDoAAAiBsmkq6vwB5fnOnHUSg16XWFqRA9ZPJEbo7JZWhGMhaI8VmksO/bfGBAo6hwcJjmwNDc8TCaeJLsuZjjN8XPxBxD2oIUm/I3XrKwu9LjRK4tEMQaT1/IXxEnS+SM/LsX7LcoIWt/LKCXImCvpVk60xgYLO/nzx2CMUik10Lg/q/YHEm439iNOERN9ICs9nir1pHP0BfUjqpS1oSEZwafFEI4xFMNHTQ8QOolOoMYhxCWqyvxJKAP+REuoX6bJRFIRGwR/oCfxBSBP8AT8M+IPUtyH8geIINRF0doY/GKnpRGJILPVnrAl6I86NM3JDOTdgkIg6f0C5/4A4yjPQPyro11DU+wP+3tXh7MsxB0JqyRVf/4bS6vQQ2j+WUpWWP0gxAfQXdPbk+wNROOVeom5wRlEE5fzByLcgPVZ0iPH+wApOOc8O5exfRf6A8ye+pydllEnXD0L7a3huk6t0yUUYl2AqezmuOpWKPxB1csoi1FAwaX8g2sHuRgyM0xSXP0h0LPwBZYiHFD5foPuDeJsoKPYHlM7pntv4f1II/bECf0B/XQL1/iDiRtBwfyUhOPJIibjf1dQNuqDKzxdCgyEOgT+gAH/gAv5AdHa6GvwB5UVpFPuDeAu0Jvsr0RSVK9ChUlH6+Lsp9gf0KaR7Bg2BP6CQsj9Q2URBpT8g/k2ZYmmLsQzxw9DkLav0B7GXpxS3hv4Rpp4AoQpjXTfSvf8gdic0XlD2YCaT8bzO+dWJuvUP4l3paNzXR7LCfJ+coLIIPbIpRjhGghnfMSmnmUrwQa8LaY7X/opF0DM2lghDZ1H8ltV/vmCJFx8r2h7Uk8wo/B2c//GP5ehjfWUX47IQGAAAaALKpqnAH7hAogMAgBAom6YCf+ACiQ4AAEKgbJoK/IELJDoAAAiBsmkq8AcukOgAACAEyqapwB+4QKIDAIAQKJumAn/gAokOAABCoGyaCvyBCyQ6AAAIgbJpKvAHLpDoAAAgBMqmqajzB5TnO3MWQwx6feQiibGvn0hZo0r9smUQnEBBlXOpFLQ70NVURpjxkUqExDAU72X4g6QRTT9/f4ljwVK5vrLQ60KjIj5zwYmy5y9AEIISgirnUiloyS6XqyxCuR2UdIRBfejRxhIh/EHSiKZf0H7U0R8QH9go3cR5PpMolEQPLXMS88Z+5oCgDoL0UfAHQlIJRcjRHxd/wI5/9KIAAAziSURBVDrAHxhGlPoQZSz8gQv4AwjGKAh/QBQUlUooQo4+/IGEP8jsw3kFUDDfH1DuP6CP8ihQRlEI9Qf+be3PftFJYzccENREMHRUjOUS/iAufzByp2TcpBUhPwz7FU38wchRMAcSyKWfPVZ6XkX+gPgnfuiJ39NquwGJuUYi4Q8sd0GJvvMintsgqI8gfVT0ogl/EJc/oIxKaxty9DniSUfIL5tygQEOUQ4TIVL4fIHuDxIdNRJ6okfpw+8c8U8fCOojCH9AFBSVSihCejB6+gOJvzLhD8YR+APz/UFQT+nCAUHdBOEPiIKiUglFSA9GQ38gp6bAH9hjYQ7iYlL8gVwTUZwzKgihD9Lk+oT2jKX4QlBDwdhPD4nONYH+YKwFJdTiihD+IGmilAvd/YFlWZQVkOSahOYKRc4f7F/PE9tnHoJaITi+gvxRcoIq50pLUG6XqYxQT0FPB2URSnztC4gS8eiQ2/5YX9kFvsgLAABCwB+YCvyBC/gDAAAQQu5rX0B/4A9cwB8AAIAQ/I9lYQ7GF/gDF/AHAAAgBMqmqcAfuECiAwCAECibpgJ/4AKJDgAAQqBsmgr8gQskOgAACIGyaSrwBy6Q6AAAIATKpqnAH7hAogMAgBAom6aizh9Qnu/sfxIjfzFElesnWsELk2mysBonQrtVTi2WCDM+ogcZ+zbUX5A4XSxzqUwAHSIcC0FLv8N8kr/faPa7U7e+stDr/ibO853po0KRWF/ZX+YoE3FGyQnye8rVtXgjpIwSClJlhJoICk0XcS79t8YECvJ7pnWYR3+sXYyYfcJWTArPZyI2UbqFDo/LH/CPSWJP4qhYBKX7UMKIfm4LMgdCakmfffU8PRDnIoZBF1SQAKKCE5gAeh7m8AemAn/gAv6AEgb8gSYnMKKChsHDH5h0mFP8gcSFDRuJIaLTSSA3SyoRSk+kzh9Q7j/gDBdtCm0dCd8fBG1ruVQO+jVK4eCHob5w0MOwX0xxGxLF6YJJn8D8CiMTwDNv6sFz8jPdg4goTheckMOcctuWRGyUqSN2jk7E2JRFKzeRIn/gufGQ05P4YpQmDhx/EHTk6FM4OCJCUglFyOkfGrlWEdIFFfsDvr7dIfXgQ/trGKEmCaDnYU7/fEHo6HZCHCU0RSxoHpvcNrRJ4fMFoZO63BUCOXNgkT9f0NMfhI7SwR8EBSaRyoojlBBU7A+IghpuXok+/DBMTQA9D/PY/UHSCRYjEtYz4jmbPhHnVyIG+gNpc2DBHyQZIbEzXS2JCIN6arKX5ebi95QQNNgfaJ4Aeh7m8AdpDacrj6U/CP0So5AyZQgf+IPkIiT2TNEf0M+p4+sPYL8kwtM2Qk0Oc239gQKvENG7wB9YlmVxbkLkN1EERVdV4hC60AeD3sQhLUGhah57hMQZU4kw4yOiYOwRRp8rdsG4EkCHzTsWCUAUlHvXchFSyqYlmISeqeU2EX2IBNG3tsoILSmLgPWVXWChUAAAEAJl01TgD1wg0QEAQAiUTVOBP3CBRAcAACFQNk0F/sAFEh0AAIRA2TQV+AMXSHQAABACZdNU4A9cINEBAEAIlE1TgT9wgUQHAAAhUDZNBf7ABRIdAACEQNk0FfgDF0h0AAAQAmXTVNT5A8rznekrIcotyBjK+K6fmPER1C2tCD0DJYJPOkJ+GDrsZengnd3kNOlNpgraHehqEyIIf6AGzo6IvYmhbn1lodf9TcSnNog+wcGD8c9foNeO2CPk9BStaKFh6L9TpLehxFzOF1NMgLEWtKRW7Z0QwYT8QfSDImkUR2imPxB6YKNENwX+wDejdqUtdEhGcAnupIuvhAJ/lIJtKCqo0h+EqumWABoK8vWjSJktCH+Q+nTwB6RW+IOgIbqdHiQU+KPgD/hquiWAhoJ8/ShSZgvG7g8yPiTGSk+XdITSmOwPKPcfcIbzxYM0RUOlJDq/9KRe2vhHeOqnh5GHk9yRpngbWgHBpxIhfVLPi6kngM6ClCHSe8pgQU2uH3iOTeKh6u8jfYwkjbH+gPMnvqcn8cWgpqSvH4QmU+qljR9huqcHYiQabkPRDqFhqPQH+iSA5oKU/nJ7ymxBffyBhEKUQw/+4KdSxH6jgjjJ+ZXfFNFMxOsP+H+ZcfoIjYpS2oIi9JBKhPRRGm5DiT78MBLyB2OaAJoIUjpL7CnjBfXxB9KpLjpELsKIwB94m0Q/dEjOHwRtyjEqbUJq8AcR+/DDUOkP5CbS/3SexOaNcQNOjqA+/kDxvPAHP5Ui9hsVxMmgX/mn83i/FUmB+P1GTpPOpS2KmobVXOU21CdC+nTSfUb21HB/JS0o3WfSBBX4A2KcniFy707uGFHsFdSgbv0DieWMOP5AbumkUDj+wENQK30uzihpQeKMKUaov6DEXCoj5M9FDIYuqP/+ilEw44PTCkGb5NZHEt2DEYeIDpSbThrOLLE3MbC+sgssBAYAAEKgbJoK/IELJDoAAAiBsmkq8AcukOgAACAEyqapwB+4QKIDAIAQKJumAn/gAokOAABCoGyaCvyBCyQ6AAAIgbJpKvAHLpDoAAAgBMqmqcAfuECiAwCAECibpgJ/4AKJDgAAQqBsmoo6f0B5vrNn6eWIT3+O9/nOoQtsSS+8BUEIxoL+wUPQSEGKP+CIoEnDJoa69ZWFXvc3BT2tkb8GMy26n0J8/oL/V87RBUEIxiWoci4IQpAoCH9gXhMjheczEZtCu7EXRZv4EC+UjdysUQo9BCEYL/oHD0FjBOEPzGtiwB+4gD+A4BgJqpwLghAMAv7AvCaGOn9Auf+AMzzoRc5THxPyB0HbVPqwhCAE40X/4CFokiD8gXlNDEX+wHPjIacn5UWOGnGiIEITPcq2hiAE4xJUORcEIcgfC39gXhMjhc8XhPwB57bEKN96CIKf6PytKXFYQhCC8foD/YOHoHmC8AfmNTHG0h9Iq4XC/35jWCRimwiCEJQQVDkXBCFI6QB/YF4TI2V/wLcOlBO8Gn9AOeSEDksIQlBCUOVcEIQgsQ/WRzIVdesfBF3w5zcRZYWaOHD8gQdOK2UiCEJQQnCsg4egqYK4fmBeEwPrK7uAEQYAACFQNk0F/sAFEh0AAIRA2TQV+AMXSHQAABACZdNU4A9cINEBAEAIlE1TgT9wgUQHAAAhUDZNBf7ABRIdAACEQNk0FfgDF0h0AAAQAmXTVOAPXCDRAQBACJRNU4E/cIFEBwAAIVA2TUWdP6A831noSUsSCzKGwn/+An8dMeKCZRCEYBRBlXNBEIIUQayfaF4TQ936ykKv+5uIj2aQeIKDE+LzF/y/co4uCEIwLkGVc0EQgkRB+APzmhgpPJ+J2MTpJu0qQiFeKBu5WaMUeghCMF70Dx6CxgjCH5jXxIA/cAF/AMExElQ5FwQhGAT8gXlNDHX+gHL/AWc4XZA/lk+URJc+LCEIwXjRP3gImiQIf2BeE0ORP/DceMjpSXmRI5i0P4iyrSEIwbgEVc4FQQjyx8IfmNfESOHzBSF/QHEMyvwBf2tKHJYQhGC8/kD/4CFoniD8gXlNDPgDF/zvN/LHih6WEISghKDKuSAIQUoH+APzmhgp+4PYv8So5vuN0n0gCMEogirngiAEiX2wPpKpqFv/QGI5I/6VBpXrI2V8cFopE0EQghKCYx08BE0VxPUD85oYWF/ZBYwwAAAIgbJpKvAHLpDoAAAgBMqmqcAfuECiAwCAECibpgJ/4AKJDgAAQqBsmgr8gQskOgAACIGyaSrwBy6Q6AAAIATKpqnAH7hAogMAgBAom6YCf+ACiQ4AAEKgbJoK/IELJDoAAAiBsmkq6vwB5fnOnpWSJZo4c1HgP3+Bv44YccEyCEIwiqDKuSAIQYog1k80r4mhbn1lodf9TdGf2kCB+PwF/6+cowuCEIxLUOVcEIQgURD+wLwmRgrPZyI2ySlEMQcW+ULZyM0apdBDEILxon/wEDRGEP7AvCYG/IEL+AMIjpGgyrkgCMEg4A/Ma2Ko8weU+w84w4lNnLkoREl06cMSghCMF/2Dh6BJgvAH5jUxFPkDzt0Dnp7EF4Oa6HONJDTRo2xrCEIwLkGVc0EQgvyx8AfmNTFS+HxB4noAsbPQXCPhJzp/a0oclhCEYLz+QP/gIWieIPyBeU0M+AMX/O838seKHpYQhKCEoMq5IAhBSgf4A/OaGCn7A+lvKhJvVojLH1AOOaHDEoIQlBBUORcEIUjsg/WRTEXd+gehaxlFv3gQKhgKxx944LRSJoIgBCUExzp4CJoqiOsH5jUxsL6yCxhhAAAQAmXTVOAPXCDRAQBACJRNU4E/cIFEBwAAIVA2TQX+wAUSHQAAhEDZNBX4AxdIdAAAEAJl01TgD1wg0QEAQAiUTVOBP3CBRAcAACFQNk0F/sAFEh0AAIRA2TQVuj/4/wkqvxKw3dKrAAAAAElFTkSuQmCC" alt="" />
图2.2 --启动SQL Server服务,更新定长字段NAME
UPDATE dbo.UpdatePage
SET NAME = 'xxxx'
WHERE ID = 1
--保存数据到硬盘
CHECKPOINT

--查看槽号位置
DBCC PAGE (CSDN, 3, 8 , 2)

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图3.1
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" alt="" />
图3.2

--启动SQL Server服务,更新变长字段remark
UPDATE dbo.UpdatePage
SET remark = 'remark'
WHERE ID = 1
--保存数据到硬盘
CHECKPOINT
DBCC PAGE (CSDN, 3, 8 , 2)

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图4.1
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" alt="" />
图4.2 --启动SQL Server服务,再次更新变长字段remark
UPDATE dbo.UpdatePage
SET remark = 'This is a long text.'
WHERE ID = 1
--保存数据到硬盘
CHECKPOINT
DBCC PAGE (CSDN, 3, 8 , 2)
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" 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ld9kcuu3s4u5PLdnPZ6qED51+X23rLL1fed1ntQ3/c+uLn2zf+n97DRwavvrJdr9tPpPVazG59fX1lZWVxcfHs2bOFQuHVV1995ZVXTp8+XSgU7r777vX1dfblf32+HggAANoCgzeVvR/qsQfMdLtdtoAMW/7d5vz58xsbG1tbW/Zy9PbDZprNJluU3rUuPVtqvr/PYAznuvRsRfrx5ejtxfA3NzeZr6+uri4tLS0sLLAV6W3OnTvHluU5cuRIrVbrdDpwdwAAoACDN5U9g7cfIsce7Vqv1yuVim3z9oPb2WW9bfmbm5u26zPjZzjtn70DmIjzybPOp8kxR7efHG8/ZmZxcZEtwjM3Nzc3N3f27Nn5+fnFxcXl5eX19fXNzc1qtZrP53u9nj6/2gcAAM2BwZvKa0vt2IvEDQaDTqfDniZn2/z6+vrs7B2zsz+enf3Ryj6rq6uzs3fMzt65/+8nMzM/YfZve//MzL3sX9WB/Uj4ra0t58PgXR3Nzt7Ortfn5+fn5+fPnTs3Pz+/sLDAltFlXxQ4f/58uVyu1WqtVqvb7T755JNeF+6cxZjk1mmCYKSCdgW6WhQRTgwjNYaooFcvIQZPCVKH4Z3YSnqE1UQY5OgrG0NnKb85DH4cuQOhG+7o2RNj7S+1tVot9uH3zMw97JK6WCyurq4uLy8vLS0tLS1ddNHti/ss7cO8f21tbXb2Tvuif5z19fXZ2TtnZ+9YWVlxCN62uLi4sA976ZQtFovOLwfYi+QPh8PRaHTixInJ+6n9KuUQ9ErxFKmIIuSEIS3I6cjrZSjDO16qyfAKbRdSUxahtFqkEVrkowyDdyF3cDVkQujjT3bJZB5qNBrsgn5ra8t583x29sfs/vk47FqfOf3a2lrRAdvC2s7O/ujCVrcvLS0tLy+vrKw43yLYdwXYRwDNZrPdbne73cFgwB5qx67aiTM1lPMqXEF6Kw39OLpdjt2BvOpPu8ELSfmGEXqEmhg8PUJNTiK5OjB4J74n+xThGTd7jjv76Xk6/Uiv13N9oZ3dY2c32CdeoM/M3MU+qmef1rvY2NhgFWZm7rqw1U+cH/Db9/br9TozdfuhdravO2/Iw+ApgnrmJhi810sYPBEYvFwdGLyTIAZPvGXirDzxD3pH/Pr+WuyZsKPRKJ0+nk4fS6cftn+91mq1MpkHMpn7M5n7M5n7Zmbuc37QnsncV61W90vvZ9+8Y9+nq9VqbItd7cKGrMkDmcyDzNG73S77Kj4zdc4X6CgzlX8iSWSWUAR9WwlNHb6gnrlp6gyeeI7JdRHK8PpGqIPBT4xQbngVRygtqCZCuhQM3snEk53SynU0hVo5/xALl/82lNY+zx7byu7ep1LH7UXl2E/d7B+5ZTJH7B/LZTJHnC/T6cl/O+uwIvYru8FgMBwO2bPn+abuhPLcQ/6WUFK/hCC9lYZ+nEyDDyLo20WIwXNaxW7wHBE5QWUR6nMS+Y4hDF4IaYMP0mr8D9+GTjyr0bTyE1+y2+PsA3tGOn2c/bG9vZ1OH9t24HyZTh9z/DtutxqNRqnU8Z2dHWbnu7u74w+S58OfqZTZHyTlBRGEwWvoQJz6MHg1EyAsQf3nfIwnEQzeibRVj0PvS8jgBU4cXy3L2+D5NYmt+NVCNHivUZDOnuEKItlp6ECc+jB4GLzmgnQpGLwTaYMP0pemBi9XRBTntPLCa6bSc4fceRW64HSlEhi8hgav//AaIyh9VaDJUYbBu5A4uKlUytVKyKrjNHjLstjH8PaH8cGLXBWEWnHgGLwLr1JiR6EL8lslXFDuuIQeYcpxEsqFF2PwnCJNhneKBIMcfQ2PMgx+nIAHV7Ty+B/EtnarydUEYp8GMFMBAEAIpM2JSBi8bkx39ONgpgIAgBBImy6c1j7VNj+tcXuBmQoAAEIgbZoKDB4AABIN0qapwOABACDRIG2aCgweAAASDdKmqcDgAQAg0SBtmgoMHgAAEg3SpqnA4AEAINEgbZqK0HpJPqvO8RezIwq6KtDDY/DXog9xAanUGAEFQ4/Q1ZAYucoIp2IMozgoKvvit5JW03Z4wxVMjeFVLa4IXQ0lgrfUGrzE3gFpBJaqFdruW+pr3qEvVev1klPEDU93QU5NTSJMoKDivjg15bwz3AinWtC5UfqIqDzNOSi+gofBu4huQIizPK+syFlBZ4OnN9EkNxH7UhkhvYkOEUYhyFGIdAKISvmGocnwqp+ibGOMBk8/zTnA4OMFBk8FBk+pNi3ZU1RQfwciiofSFwweBk+MSs7gU/u4/qY0HFegd0dvIk0sHYl2R2kiYPCUz+DprbyK7FLnH3TUG3wozsQPI8iZP3ESyE0p9WOoT4S+CsETgcoJICoVUYREcbqg4ilqb5z20zzIFbxLnBJ28HETahsQBR1JzEbXmHue4DS5C2yYeGnOacUvonTkhVYGH2/25Jx4U5E9JQRVRjgVBu+beTUx+LCGN64I4zV4YiScooAGL9ckyNyLGvp7o7C6C1g/qMFzXnoVcVrxi/hfy+ej2ODDcnd+GJokO/VjKCqoMsKpMHjfVjoYfIjDqzhCCRuI5Sj7Fqk3eAnjVGa6oZ/aoj1S6hOnn3YGT+zIC00MXm7Se73UJNkl0+CJhxgGLycb7vDGNUWl9zexBi/dNki/csp6Gjy1Jk0u7/Uy9CLKdg4qDT5Ed+eHoUmyS2B+p6dLGHzwCIl9qYyQWFNPg6cLxmXw9Obj1Uw1eOJ8czXxTKTkCPK+S9mEVeSqQIyQoWyhG4trTi7ogqFHON5KOryIIpToS1mE/LGSi1BZ8HRBuQEJHmEUwxvFGBJ7jDHCgIIBv0Uvt/uW4NDJdSeHq6Oou7PEZxGxSeRxKwZrLgIAgBBIm6YCgwcAgESDtGkqMHgAAEg0SJumAoMHAIBEg7RpKjB4AABINEibpgKDBwCARIO0aSoweAAASDRIm6YCgwcAgESDtGkqMHgAAEg0SJumIrRuzoSl5XyfDRPFIncclK1klxojoKDiCJ3V4opwKgTttkJ9yaH/aCRQ0NncS3BiqW94rkg4RXRZTnec5tNi8AGPoIZEvUcCS9UKbRdqJbFMvRfK1qKfakHnRvrEmupdlhO0uKlTTpDTkddLTUYjgYLO+nzx0CMUik20LxfqDV5iZ0M/4zQh0h0hTsp8pEXTaPD0JrHnJq8mKcFlliONMBTBSPN7wAqiXah5hxeWoCbHK6IJMH6m+L7ho8sGURBqBYPXExi8ADB4egwweLnY5CqIdgGD10HQWRkGP1HTiUSTUPLPVOO1I87BmThQzgH0FKFFkGf/+34GT2zlajjeyuulL+oNnn94dLBPjrsLqUWXPccHSqv87ls/lFwTl8HHOAH0F3TW5Bu8KJx8LZE3OK0ogtJPk/PdQm8r2sR4g7e8p5zrgHKOL9XgORfZrpqUViZdwfvW19Cc5FJVdBGGJRjLUQ4r0cRi8KJvxZRFqKFg1AYvWsGuRgyMUxSWwUfaFgZPaeJWoEWQ57z0KpJz8ekyeErleM2J/6Ze6HIBBk/fLoF6gw84CBoerygEJ54pAY+7mrxBF1R5i943GGITGDxJnBZBnvPSqwgGLyQYV4QCcwUGT9gojWKDDzfDanK8Ip2ichnWVypInfFqig2e3oV0Ta8mMHiSOC2CvNdLlUUUVBo88aouxtwUYh7hh6HJLqs0+NDzS4yjoX+EsU8AX4WpzhvxfgYf+luZ6YJyBFOplGs75+UFauQg8uEuWTPtC91Yfu+85ASVReiSjTHCKRJMjZ1UcpqxBO+1XUhzuo5XKIKutqFE6NuL4l1Wf4veEk8+VrAjqCepSYxXcP4x3panH0XQMTItSzIBAIAmIG2aCgweAAASDdKmqcDgAQAg0SBtmgoMHgAAEg3SpqnA4AEAINEgbZoKDB4AABIN0qapwOABACDRIG2aCgweAAASDdKmqcDgAQAg0SBtmorQKkITVpdzPS6Wsyyd1/aJy9WFvpIdZbUg9QtIQTCBgir7UiloV6CrqYwwNUYsERLDUHyUYfBRIzr9xutLnAuW0FK1QtuFWgVcf96JsrXoIQhBCUGVfakUtGRXHlUWodwBijpCrzr0aEOJEAYfNcLG7HEcIzF44uPjpIuID5unQJmpvnlKot/QUz8EdRCkt4LBC0lFFCFHf1oMnlWAwRtGkPwQqC2tg3ykRTB4COopCIMnCopKRRQhRx8GL2HwqX04WwCFKTB4ymfw9FYuBUorCr4GPz5Y49NXtNPQ3zFAUBNB31Yh5jsYfFgGP/GgpC4krgj5YdhbNDH4ia3g7hLITT+7rXy/tA4meLBXTWIrp4XTW/kiYfDWhRkh+OgHNCcI6iNIbxU868HgwzJ4Squ4xpCjzxGPOkJ+2pQLDHAIcpqIdUTrIM956VUUdauJ0GdqkDr8ygEvPiCojyAMnigoKhVRhPRg9DR4ies8GPw0AoP3bzURlQbvVVP6zIegboIweKKgqFREEdKD0dDg5dQUGLzdFu4eFlNj8HJFRHFOKy+EPkySq+NbM5TsCUENBUPP75H2lUCDn2pBCbWwIoTBR02QdBG5wVuWRVnKRq5IqC9f5Ax+/5aY2KC78CqF4PQK8lvJCarsKy5BuUOmMkI9BV0VlEUo8eMjIErAs0Nu/E07ZvhBJwAACAGDNxXTjhkMHgAAhJD78RHQH9MOGwweAACE4H+yCXefXkw7cjB4AAAQAmnTVGDwAACQaJA2TQUGDwAAiQZp01Rg8AAAkGiQNk0FBg8AAIkGadNUYPAAAJBokDZNRWgBpgmry7keFzv+XDj+snQqV7KzvJeI0mSJK06EdqmcWigRpsYIHmToY6i/ILG7UPpSOQF0iHAqBC39TvMk/0zO8L2j1qOtJM8p4jwult7KF4mlasfzFKUjTis5QX5NucQUboSUVkJBqoxQE0Gh7gL2pf9oJFCQXzOu0zz4M7pCxGzHVQxxlucliijVfJuHZfD8k4pYk9gqFEHpOpQwgpuTl7sLqUVtn3rmd2JfxDDoggomgKhgAieAnqc5DN5UYPA482HwsUVIVNAweBi8Sac5xeAlbi3YSDQR7U4CuV5iiVC6IwGDp3wGz2kuWuRbOhG+wXsNltxc9HoZ5Mznh6H+zKeHYW+McQyJ4nTBqB1oXGHiBHD1G3vwnPkZ70lEFKcLJuQ0p3x1SSI2StcBKwcnYGzKopUceZr0BeYtathyBi/h7hbX4L2mvj5nPkdESCqiCDn1fSPXKkK6oGKD5+vbFWIP3re+hhFqMgH0PM3pt+iFzm4nxFZCXYSC5rHJjeFrCrRu8pyX/CK5a3Q5d7fIt+j1NHjfVjoYvFdgEnNRcYQSgooNniio4fBK1OGHYeoE0PM0D93go55gISLx3jGg6dI74rykitB6ynNe8oskDF7a3S0YfJQREivT1aKI0KumJkdZri9+TQlBgw1e8wmg52kOg4+rOV05HoP3/S2ckDKlCR8YfHQREmvGaPB0U5xeg8f7J4nwtI1Qk9NcW4NXYPYB33yYYPCWZXG+SccvogiKLo/DwXfFBga9iENcgkLpOPQIiT3GEmFqjICCoUcYvK/QBcOaADoM71RMAKKg3F7LRUhJm5bgJHR1LTdE9CYSBB9tlRFaUh6v9GaIArDmIgAACIG0aSoweAAASDRIm6YCgwcAgESDtGkqMHgAAEg0SJumAoMHAIBEg7RpKjB4AABINEibpgKDBwCARIO0aSoweAAASDRIm6YCgwcAgESDtGkqQqsLTVhajrPwHH9NOrml8XyZ3pXsUmN4VYsrQldDieCjjpAfhg5HWTp4ZzU5TXrRVAvabYX6UhlhuIc4lAhh8EIEmZmKEViqVmj7eBFxBXvR1exdGL8WPX1KhR4hp6bcRJ/qgyI9hhJ9OTfGOAH0F7S8VznVJEJ+K7m3C8EjjMjgp8D/Ar931HwfiZMyL1FEr6bA4Md61DE38ZukBJcjjjo3SSjwWykYQ1FBlQbvqxb7BODo63YS+dbX0+CFpEKMEAYv3UTzfTV19+QAAA4SSURBVITBa5ebvJrEnt9h8DD4cAVh8KYafGoMibbS3UUaobEGT/kMntOcL+6lSQnPCWWm8o+QnrnJ3hi7wU88H0I/VSLK7/pESO/UtTH24L0mgISg+gkgqhbRScRvJXo4gkeoyRW8a14RT9XxOtLHV6KJIQbPuch21SRu9CqK+gredzZomJs44iojHD/9iF0ri5BeP/YI6Z3y+6XrhB58pG4X3QRQb59EwRgj1MfgJRSCnHoweMsSMV3RR8IH6Wsi/JlKOZ3izU1eEbqIJUJ6Kw3HUKIOP4yIznOdJwBHX6uTiFM/oA4MXgiJ0Zae6qJN5CIcbwKDn1yZuD1Egyee85qbE10NBh+wDj8MlQYv1xEMnrJRSAcGL0RYb8ui6xcGb1lc0+X7cbg/rqNA/JkcpyjG3BSiM/HD0GSXVY6hPhHSu5OuM7GmhsdLpcEHfxNjRbzLolIhRqjA4Ilz29VE7oyQO0dCv87RAfpA5CXWpeEYvNwaOL5wDN6FVym9L04raUFijzFGqL+gRF8qI+T3RQyGLqj/8YpOMDXmFhKace2yygijW+gmyPhINBFtGLw7ob7Uo3t8omBJJgAAEAJp01Rg8AAAkGiQNk0FBg8AAIkGadNUYPAAAJBokDZNBQYPAACJBmnTVGDwAACQaJA2TQUGDwAAiQZp01Rg8AAAkGiQNk0FBg8AAIkGadNUhJbv8Vl1bvyhcwEfJhvu42LjWpFKQm28IQQlNOlFKgVV9gXBhAvaFfgKMHhTEViqVmj7eJHXs+P4y9nSonsN4lr0zpecIg4QhKCEoMq+IJhwQYu8DisM3lSIcygvUeRbjW0ULeIzvQZPFIegnKaegir7SoIgvZWGfhzdLsPgEwsMXpcTlSgOQTlNPQVV9pUEQRi8JgbvvHPguosQehHgIGDwlM/gOc29NnKeQZdMg/c6RaWndQIFxzWDO1Dogir7SoigbyvRGaV/3qC08pWK4gqeuGuhFAEvqAbPeQa8qyZlI/GJ8jB4CJoqqLKv5AjSW2nox4YZvN0vJ6QQi8BEBK7gvV7yizjfrQvy3Xsvpt3gKecnBKddUGVfiRKEwWtl8PyuQy8C48Rj8NJqvsDgEy7oVVMfQZV9JU0QBq+VweMKPnaCGjzf+ykODYP3rQlBuYOioaDKviCo4WmeHIMn7looRcALeiLOe90z5xcRZYWKOEzvQjeWX76DIEXNhW6CUx28/oL8VgkX5GjiW/SmYtoY4QedAAAgBNKmqcDgAQAg0SBtmgoMHgAAEg3SpqnA4AEAINEgbZoKDB4AABIN0qapwOABACDRIG2aCgzeQH7qTdyhAQC0Q1naTKU8/4EoMG1cYfAWDB4AIAIM3lRMG1cYvAWDBwCIAIM3FaH1kiYsLRfksTESS+P5onIlO2dzoe1RR8i8/P1jTDT4KNbMogta3utSyQnqHyGlo1D6So0RPPjQh1d/QUvvKRrKUZY2ePHdT3n/8+9ILkhrGpa2jShCgaVqhbaPFxGXqZdYzd6JsrXonfU5J6qQTlgR2gbvewUvmkrCitC3ppyg/hHSOwoePAQ1nAB67nLAK3ghg3dcsl/wd6i9gD2IcygvUcSpJv22wBfFBp+y5ymhU4pUKBESDZ4ffKQR+lbTM3sGj5DeV4jvQX2bxGif4QrqPwH0PMpBDF4ojaQuuCefSoncoofBSwCDh8HD4NVFSO9Lk9TPqQaD1yFCehMzDD6VSonmVdEmzlYSbUWJNEIBg6d8Bs9pThfkt+Wj0uDtmtoavOsDeKfB+wYfaYTOal5zVOIEUxmhS1xng+fMz3iHlyhOF9R/Auh5lIN8Bu8bwIX1Axm8RNaSqD8xFwl1J0FEEVINnvMMeFdNykaO4LQYPGVmx2vwLpxfshM9LUOP0K7mJaJPfueL2BWm0eBFBVVGaOoE0PMoT4vBC/Xl1TbcymERUYRUg+e85BdRLH9KDd6Fb6e+gmFFSDF43+AjjdAAQX5NCSJK/bS0G6c5Uc4dYyaAnkc5+LfoiWlkKgzeEt+v4EQUIQw+6BtnThNtDV4uyKn2Y03yu1xfBhs88dwxZgLoeZTlDH5c0DeMaTH4cJsr6MLzPKI1znu9DP23cDD48ZdyBu/6kh0MPlxBCTXpvhJin/pHGHwC6HmUYfD8yroZPD1C+hzKS6xLw7/WN2Ohm4kNUxciKhUwQqepe33JjhO8gggNE6SrBe9LNHiJvpRFmBpDtwiJgnS1iCKU6MuJhMGPy1I6sq3d+Y9i8E5xoSHiTLDQW8kRaYSRvzFRDJaqtbBULQBABCxVayqmjSsM3oLBAwBEgMGbimnjCoO3YPAAABFg8KZi2rjC4AEAQAikTVOBwQMAQKJB2jQVGDwAACQapE1TgcEDAECiQdo0FRg8AAAkGqRNU4HBAwBAokHaNBWh9ZImrC7nelysa9FZiSJOXxRUrmSnv6Dlt+qTtJq2u6xyDJ3bRTX5HUUafGoSiFAowolBxhVhcEGDDV7uiBuDwFK1QtvHi4KvYE8hlsfF6inIrymXR8KNUH9BTk2XePAMElfwdEFEqGGEoQgabPAMGDy3kuAD4IMoBHF3K6aHzYQiGPWZL12HEkbSxnDipRJFkN5XpBMg+AGyEh+hRDV+GDGeRDB4U4HBJ86cJKR8w0jaGBpj8PFOgKmOUKIaP4zkGHzKgbIeJZoIRWhXltivIG19lGnd59n/vp/Bc5oTizh9UdDhcbFamRN/mupj8NM1hlEkJpUTQC7DIkJKp4ojJIrzBWO8go/iVArYy/jJTp8tdk25JqGPBtXgOZ+gu2oSN3oV0fuaiHqDH6+vjzn5epImuWnqxnBaDN5LRG5HEKGpJ1GMV/B6Grxcc9+p4ttXbAbPeckvCvhuQHODp5zwMZqTbysdctM0juG0GDxREBFKCArpRBchp7KeBh+1pVE6Fa0Mg/csMtjgvWpqbk4SUhFFyKmp+RjC4BGhkE50EXJqwuDlelFs8M6sop3BS//gjfiBvbYGz6mmuTlJSKmJkNhXjBGGdb2lpq+ptk/9BekiKiMk9uUCBu+q7Dou0Rm8q4t4DN6yLMqiNMEv330FfVG20E1qjICCoUdIF5Tb6+ARmjSGdEGVfU1sFSRs9RGKaqqJ0C6i60QUIX+giILxfotebhgl+pI77hL1JbqzRUSb+AiGKxc7xv+gEwAAwgVpMy7G35CFrB+uXOxgpgIAgBBIm3EBgxcDMxUAAIRA2owRuU8QqOKhK8YLZioAAAiBtGkqMHgAAEg0SJumAoMHAIBEg7RpKjB4AABINEibpgKDBwCARIO0aSoweAAASDRIm6YitLLPhNXlXI+Lda1iy3mYrNzSeL5ospKdsxpRMPQIXQ0lgo86Qn4Ycrus/1EmdkcvEhUc3ym5AYkuwmkRtCvQ1fQUhMHHDucYyRXtVSB3nxfaPl5EXMF+Stein9hKNHWGGyGnpmgG8Q0j9DHUX9C5UW486X3pPxoJFLSkViTVUzCIwYcy+SNF/witeA1ebkl5TrXgz6TxQv3z4L2apASXWY46N0ko8FtFOoaa5HffJqJHma4fbvB8QQkFvqCGfhz6GAaU0koQBh87MHgSMHhKNU3yO1GcLqj/UabrqzH4sC4WNTleMHiVBp8aQ6KtRH162yARKiZ+g6d8Bs9p7rVFqKEv6g2ef0bFbvATZ7bcpFc/hvpHKKdG6SJcc+JMgBgj1F+Q0kT66OsjqPIK3jXr6JOQczTpDbUlZoPnfEzuqknfaMvSW/mig8HLTcQokh0xktizJ38M9Y9Qc4PnBA+DJxL89NFZULHBSyuk9i9aAvaoITEbPOclv4ji03KtJqLY4L0u7FxISEWa7Pg1lUXIqaxVfg/xKNN7UTm8clIa+rHKMZST0lNQ/RW89LkT+uBoQoIMXtrdLT0MXk4NBk/sS5MIpdWIIqEE71UTBh98DCWktBWM9wpetK3KHpWhqcFLf3suSBMOKg2eUlNPg9dEkFNT/wjl1OgioR8vYl8xRqi/oHQdzQXDMnhiMK4mEsdCeohEG07FmwMO9DSXl1iXhn+t76smsdaNsoVuLNobZyHNKCLUX1CiL00idMnSNX2lQgk+NYbXdjnN4BHqL8gfKIkx1FMw4EI3QQ6TRH0F3TlbCTWRhtORXNFeBfmItARLMgEAgBBIm6YCgwcAgESDtGkqMHgAAEg0SJumAoMHAIBEg7RpKjB4AABINEibpgKDBwCARIO0aSoweAAASDRIm6YCgwcAgESDtGkqMHgAAEg0SJumIrQY0ISl5fgLz0mvfye3jJ0lu5KdXUGoLwhCUEJQZV8QhCBFkGLwHBEUaVi0V4Ff7BDKC20fLyKuYB9waXqJtegt2bUPIQhBUUGVfUEQgkRBGLx5RXsV+MX7KvngRfEa/FhsE3Y8SKaGIATDRf/gIWiMIAzevKK9CvzifZV88CIYPAQhGGNfEISgFzB484r2KvCL91Xy7H/fz+DHG3q14r+M4jN4h/7kvZY+ryAIwXDRP3gImiQIgzevaK8Cv3hfJc+5yHbV9KqmyRV8kMGCIATDElTZFwQhyG8LgzevaK8Cv3hfJc956VWkocHzh0PivIIgBMM1eP2Dh6B5gjB484r2KvCL91XynJdeRboZvP9YCJ5XEISghKDKviAIQUoFGLx5RXsV+MX7KnmvlyqLKBB/JiddB4IQDCKosi8IQpBYBwvdmAp1JoW+ZI3ihW5SY3BKKR1BEIISglMdPARNFcQVvHlFexX4xVMH3ooCAIAQSJumAoMHAIBEg7RpKjB4AABINEibpgKDBwCARIO0aSoweAAASDRIm6by/wG7g1V0pARaVwAAAABJRU5ErkJggg==" alt="" />

--结论:

#1.对于更新固定长度的字段,直接update字段值;
#2.对于更新可变长度的字段,当字段存储字符变小时,可能会“先删后加”(这种情况笔者也测试产生过),也可能不会(本例中的就是这种情况)。会的话主要考虑了存储空间的利用,减小碎片;而不会的话,主要考虑了效率。
#3.“先删后加”逻辑上相当于先delete记录再insert记录;物理上并未delete记录,而是更新了Slot中的偏移量并Copy未变化字段Insert到新位置。
#4.从性能上讲,update定长字段的效率会好些.但在设计表时,用定长还是变长字段,还是应该根据业务来定。
#5.最后一句话:Update是“先删后加”不是绝对的。

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