锘??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#20122;&#27954;&#32508;&#21512;&#23567;&#35828;&#21478;&#31867;&#22270;&#29255;&#21160;&#22270;&#44;&#20122;&#27954;&#31532;&#19968;&#25104;&#20154;&#22312;&#32447;&#44;&#22312;&#32447;&#57;&#49;&#31934;&#21697;&#20122;&#27954;&#32593;&#31449;&#31934;&#21697;&#25104;&#20154;</title><link>http://m.tkk7.com/narry/articles/242644.html</link><dc:creator>narry</dc:creator><author>narry</author><pubDate>Tue, 25 Nov 2008 13:37:00 GMT</pubDate><guid>http://m.tkk7.com/narry/articles/242644.html</guid><wfw:comment>http://m.tkk7.com/narry/comments/242644.html</wfw:comment><comments>http://m.tkk7.com/narry/articles/242644.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://m.tkk7.com/narry/comments/commentRss/242644.html</wfw:commentRss><trackback:ping>http://m.tkk7.com/narry/services/trackbacks/242644.html</trackback:ping><description><![CDATA[<p>鎽樻妱鑷細http://www.cnblogs.com/wzcheng/archive/2006/10/18/532243.html</p>
<p>璁劇疆浜嬪姟鐨勭駭鍒?SET TRANSACTION ISOLATION LEVEL<br />
A銆丷EAD COMMITTED 錛氭寚瀹氬湪璇誨彇鏁版嵁鏃舵帶鍒跺叡浜攣浠ラ伩鍏嶈剰璇伙紝浣嗘暟鎹彲鍦ㄤ簨鍔＄粨鏉熷墠鏇存敼錛屼粠鑰屼駭鐢熶笉鍙噸澶嶈鍙栨垨騫誨儚鏁版嵁銆傝閫夐」鏄?SQL Server 鐨勯粯璁ゅ�箋�?br />
B銆丷EAD UNCOMMITTED錛氭墽琛岃剰璇繪垨 0 綰ч殧紱婚攣瀹氾紝榪欒〃紺轟笉鍙戝嚭鍏變韓閿侊紝涔熶笉鎺ュ彈鎺掑畠閿併�傚綋璁劇疆璇ラ�夐」鏃訛紝鍙互瀵規暟鎹墽琛屾湭鎻愪氦璇繪垨鑴忚錛涘湪浜嬪姟緇撴潫鍓嶅彲浠ユ洿鏀規暟鎹唴鐨勬暟鍊鹼紝琛屼篃鍙互鍑虹幇鍦ㄦ暟鎹泦涓垨浠庢暟鎹泦娑堝け銆傝繖鏄洓涓殧紱葷駭鍒腑闄愬埗鏈�灝忕殑綰у埆銆?br />
C銆丷EPEATABLE READ錛氶攣瀹氭煡璇腑浣跨敤鐨勬墍鏈夋暟鎹互闃叉鍏朵粬鐢ㄦ埛鏇存柊鏁版嵁錛屼絾鏄叾浠栫敤鎴峰彲浠ュ皢鏂扮殑騫誨儚琛屾彃鍏ユ暟鎹泦錛屼笖騫誨儚琛屽寘鎷湪褰撳墠浜嬪姟鐨勫悗緇鍙栦腑銆傚洜涓哄茍鍙戜綆浜庨粯璁ら殧紱葷駭鍒紝鎵�浠ュ簲鍙湪蹇呰鏃舵墠浣跨敤璇ラ�夐」銆?br />
D銆丼ERIALIZABLE錛氬湪鏁版嵁闆嗕笂鏀劇疆涓�涓寖鍥撮攣錛屼互闃叉鍏朵粬鐢ㄦ埛鍦ㄤ簨鍔″畬鎴愪箣鍓嶆洿鏂版暟鎹泦鎴栧皢琛屾彃鍏ユ暟鎹泦鍐呫�傝繖鏄洓涓殧紱葷駭鍒腑闄愬埗鏈�澶х殑綰у埆銆傚洜涓哄茍鍙戠駭鍒緝浣庯紝鎵�浠ュ簲鍙湪蹇呰鏃舵墠浣跨敤璇ラ�夐」銆傝閫夐」鐨勪綔鐢ㄤ笌鍦ㄤ簨鍔″唴鎵�鏈?SELECT 璇彞涓殑鎵�鏈夎〃涓婅緗?HOLDLOCK 鐩稿悓銆?br />
娉ㄩ噴<br />
涓�嬈″彧鑳借緗繖浜涢�夐」涓殑涓�涓紝鑰屼笖璁劇疆鐨勯�夐」灝嗕竴鐩村閭ｄ釜榪炴帴淇濇寔鏈夋晥錛岀洿鍒版樉寮忔洿鏀硅閫夐」涓烘銆傝繖鏄粯璁よ涓猴紝闄ら潪鍦ㄨ鍙ョ殑 FROM 瀛愬彞涓湪琛ㄧ駭涓婃寚瀹氫紭鍖栭�夐」銆?br />
SET TRANSACTION ISOLATION LEVEL 鐨勮緗槸鍦ㄦ墽琛屾垨榪愯鏃惰緗紝鑰屼笉鏄湪鍒嗘瀽鏃惰緗�?br />
<br />
<span style="color: #0000ff">鏈瑙ｉ噴錛?/span><br />
<br />
鍦ㄤ竴涓▼搴忎腑錛屼緷鎹簨鍔＄殑闅旂綰у埆灝嗕細鏈変笁縐嶆儏鍐靛彂鐢熴�?br />
銆�銆�<br />
銆�銆�鈼嗚剰璇伙細涓�涓簨鍔′細璇昏繘榪樻病鏈夎鍙︿竴涓簨鍔℃彁浜ょ殑鏁版嵁錛屾墍浠ヤ綘浼氱湅鍒頒竴浜涙渶鍚庤鍙︿竴涓簨鍔″洖婊氭帀鐨勬暟鎹�?br />
<br />
銆�銆�鈼?璇誨�間笉鍙鐜幫細涓�涓簨鍔¤榪涗竴鏉¤褰曪紝鍙︿竴涓簨鍔℃洿鏀逛簡榪欐潯璁板綍騫舵彁浜ゅ畬姣曪紝榪欐椂鍊欑涓�涓簨鍔″啀嬈¤榪欐潯璁板綍鏃訛紝瀹冨凡緇忔敼鍙樹簡銆?br />
<br />
銆�銆�鈼?騫誨獎璇伙細涓�涓簨鍔＄敤Where瀛愬彞鏉ユ绱竴涓〃鐨勬暟鎹紝鍙︿竴涓簨鍔℃彃鍏ヤ竴鏉℃柊鐨勮褰曪紝騫朵笖絎﹀悎Where鏉′歡錛岃繖鏍鳳紝絎竴涓簨鍔＄敤鍚屼竴涓獁here鏉′歡鏉ユ绱㈡暟鎹悗錛屽氨浼氬鍑轟竴鏉¤褰曘�?br />
<br />
錛堜互涓婃枃绔犳憳鑷綉緇滐級<br />
</p>
<p><span style="color: #800000">緇撳悎浠ヤ笂鐨勭悊璁虹煡璇嗭紝灝?span class="identifier"><font color="#000000">IsolationLevel</font></span>鏋氫婦鐨勫悇鍊艱В閲婂涓嬶細<br />
<br />
</span>ReadCommitted錛?<br />
鍋囪A浜嬪姟瀵規鍦ㄨ鍙栨暟鎹瓺ata鏀劇疆浜嗗叡浜攣錛岄偅涔圖ata涓嶈兘琚叾瀹冧簨鍔℃敼鍐欙紝鎵�浠ュ綋B浜嬪姟瀵笵ata榪涜璇誨彇鏃舵�誨拰A璇誨彇鐨凞ata鏁版嵁鏄竴鑷寸殑錛屾墍浠ラ伩鍏嶄簡鑴忚銆傜敱浜庡湪A娌℃湁鎻愪氦涔嬪墠鍙互瀵笵ata榪涜鏀瑰啓錛岄偅涔圔璇誨彇鍒扮殑鏌愪釜鍊煎彲鑳戒細鍦ㄥ叾璇誨彇鍚庤A鏇存敼浠庤�屽鑷翠簡璇ュ�間笉鑳借閲嶅鍙栧緱錛涙垨鑰呭綋B鍐嶆鐢ㄧ浉鍚岀殑where瀛楀彞鏃跺緱鍒頒簡鍜屽墠涓�嬈′笉涓�鏍鋒暟鎹殑緇撴灉闆嗭紝涔熷氨鏄夠鍍忔暟鎹�?/p>
<p>ReadUncommitted錛?br />
鍋囪A浜嬪姟鍗充笉鍙戝竷鍏變韓閿侊紝涔熶笉鎺ュ彈鐙崰閿侊紝閭ｄ箞騫跺彂鐨凚鎴栬�呭叾瀹冧簨鍔″彲浠ユ敼鍐橝浜嬪姟璇誨彇鐨勬暟鎹紝閭ｄ箞騫跺彂鐨凜浜嬪姟璇誨彇鍒扮殑鏁版嵁鐨勭姸鎬佸拰A鐨勬垨鑰匓鐨勬暟鎹兘鍙兘涓嶄竴鑷達紝閭ｄ箞銆傝剰璇匯�佷笉鍙噸澶嶈銆佸夠璞℃暟鎹兘鍙兘瀛樺湪銆?/p>
<p>RepeatableRead錛?br />
錛堟敞鎰廙SDN鍘熸枃涓殑絎竴鍙ヨ瘽錛氬湪<strong style="color: #333399">鏌ヨ</strong>涓嬌鐢ㄧ殑鎵�鏈夋暟鎹笂鏀劇疆閿侊紝鎵�浠ヤ笉瀛樺湪鑴忚鐨勬儏鍐碉級銆?br />
鍋囪A浜嬪姟瀵硅鍙栫殑鎵�鏈夋暟鎹瓺ata鏀劇疆浜嗛攣錛屼互闃繪鍏跺畠浜嬪姟瀵笵ata鐨勬洿鏀癸紝鍦ˋ娌℃湁鎻愪氦涔嬪墠錛屾柊鐨勫茍鍙戜簨鍔¤鍙栧埌鐨勬暟鎹鏋滃瓨鍦ㄤ簬Data涓紝閭ｄ箞璇ユ暟鎹殑鐘舵�佸拰A浜嬪姟涓殑鏁版嵁鏄竴鑷寸殑錛屼粠鑰岄伩鍏嶄簡涓嶅彲閲嶅鐨勮鍙栥�備絾鍦ˋ浜嬪姟娌℃湁緇撴潫涔嬪墠錛孊浜嬪姟鍙互鎻掑叆鏂拌褰曞埌Data鎵�鍦ㄧ殑琛ㄤ腑錛岄偅涔堝叾瀹冧簨鍔″啀嬈＄敤鐩稿悓鐨剋here瀛楀彞鏌ヨ鏃訛紝寰楀埌鐨勭粨鏋滄暟鍙兘涓婁竴嬈＄殑涓嶄竴鑷達紝涔熷氨鏄夠鍍忔暟鎹�?br />
<br />
Serializable錛?br />
&nbsp;鍦ㄦ暟鎹〃涓婃斁緗簡鎺掍粬閿侊紝浠ラ槻姝㈠湪浜嬪姟瀹屾垚涔嬪墠鐢卞叾浠栫敤鎴鋒洿鏂拌鎴栧悜鏁版嵁闆嗕腑鎻掑叆琛岋紝榪欐槸鏈�涓ユ牸鐨勯攣銆傚畠闃叉浜嗚剰璇匯�佷笉鍙噸澶嶈鍙栧拰騫昏薄鏁版嵁銆?br />
<br />
浠ヤ笅鏄鐓ц〃錛?br />
<br />
</p>
<div   id="9p3thvz"   class="TABLE">
<table class="CALSTABLE" border="1">
    <colgroup>
    <col>
    <col>
    <col>
    <col>
    <thead>
        <tr>
            <th>闅旂綰у埆 </th>
            <th>鑴忚錛圖irty Read錛?</th>
            <th>涓嶅彲閲嶅璇伙紙NonRepeatable Read錛?</th>
            <th>騫昏錛圥hantom Read錛?</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>璇繪湭鎻愪氦錛圧ead uncommitted錛?</td>
            <td>鍙兘 </td>
            <td>鍙兘 </td>
            <td>鍙兘 </td>
        </tr>
        <tr>
            <td>璇誨凡鎻愪氦錛圧ead committed錛?</td>
            <td>涓嶅彲鑳?</td>
            <td>鍙兘 </td>
            <td>鍙兘 </td>
        </tr>
        <tr>
            <td>鍙噸澶嶈錛圧epeatable read錛?</td>
            <td>涓嶅彲鑳?</td>
            <td>涓嶅彲鑳?</td>
            <td>鍙兘 </td>
        </tr>
        <tr>
            <td>鍙覆琛屽寲錛圫erializable 錛?</td>
            <td>涓嶅彲鑳?</td>
            <td>涓嶅彲鑳?</td>
            <td>涓嶅彲鑳?</td>
        </tr>
    </tbody>
</table>
</div>
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