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>&#22269;&#20135;&#20122;&#27954;&#39640;&#28165;&#22312;&#32447;&#31934;&#21697;&#19981;&#21345;&#44;&#20122;&#27954;&#31934;&#21697;&#26080;&#30721;&#27704;&#20037;&#22312;&#32447;&#35266;&#30475;&#13;&#44;&#20122;&#27954;&#97;&#118;&#20013;&#25991;&#26080;&#30721;&#20081;&#20154;&#20262;&#22312;&#32447;&#114;&#9661;</title><link>http://www.tkk7.com/zhqh/articles/304904.html</link><dc:creator>zhqh</dc:creator><author>zhqh</author><pubDate>Sun, 06 Dec 2009 03:39:00 GMT</pubDate><guid>http://www.tkk7.com/zhqh/articles/304904.html</guid><wfw:comment>http://www.tkk7.com/zhqh/comments/304904.html</wfw:comment><comments>http://www.tkk7.com/zhqh/articles/304904.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/zhqh/comments/commentRss/304904.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/zhqh/services/trackbacks/304904.html</trackback:ping><description><![CDATA[<p>寮曡嚜http://blog.csdn.net/lanbaibai/archive/2004/06/29/29547.aspx<br />
璇誨凡鎻愪氦錛圧ead Committed錛?br />
褰撲竴涓簨鍔¤繍琛屽湪榪欎釜闅旂綰у埆鏃訛紝 涓�涓猄ELECT 鏌ヨ鍙兘鐪嬪埌鏌ヨ寮�濮嬩箣鍓嶆彁浜ょ殑鏁版嵁鑰屾案榪滄棤娉曠湅鍒版湭鎻愪氦鐨勬暟鎹垨鑰呮槸鍦ㄦ煡璇㈡墽琛屾椂鍏朵粬騫惰鐨勪簨鍔℃彁浜ゅ仛鐨勬敼鍙樸�傦紙涓嶈繃SELECT 鐨勭‘鐪嬪緱瑙佸悓涓�嬈′簨鍔′腑鍓嶉潰鏇存柊鐨勭粨鏋滐紟鍗充嬌瀹冧滑榪樻病鎻愪氦涔熺湅寰楀埌錛庯級(jí)瀹為檯涓婏紝涓�涓猄ELECT 鏌ヨ鐪嬪埌涓�涓湪璇ユ煡璇㈠紑濮嬭繍琛岀殑鐬棿璇ユ暟鎹簱鍦頒竴涓揩鐓с�傝娉ㄦ剰涓や釜鐩擱偦鐨凷ELECT 鍙兘鐪嬪埌涓嶅悓鐨勬暟鎹紝鍝�曞畠浠槸鍦ㄥ悓涓�涓簨鍔￠噷錛屽洜涓哄叾瀹冧簨鍔′細(xì)鍦ㄧ涓�涓猄ELECT鎵ц鐨勬椂鍊欐彁浜?</p>
<p>璇誨凡鎻愪氦闅旂綰у埆</p>
<p>璇誨凡鎻愪氦錛圧ead Committed錛?鏄?PostgreSQL 閲岀殑緙虹渷闅旂綰у埆銆?褰撲竴涓簨鍔¤繍琛屽湪榪欎釜闅旂綰у埆鏃訛紝 涓�涓?SELECT 鏌ヨ鍙兘鐪嬪埌鏌ヨ寮�濮嬩箣鍓嶆彁浜ょ殑鏁版嵁鑰屾案榪滄棤娉曠湅鍒版湭鎻愪氦鐨勬暟鎹垨鑰呮槸鍦ㄦ煡璇㈡墽琛屾椂鍏朵粬騫惰鐨勪簨鍔℃彁浜ゅ仛鐨勬敼鍙樸�?錛堜笉榪?SELECT 鐨勭‘鐪嬪緱瑙佸悓涓�嬈′簨鍔′腑鍓嶉潰鏇存柊鐨勭粨鏋溿�傚嵆浣垮畠浠繕娌℃彁浜や篃鐪嬪緱鍒般�傦級(jí) 瀹為檯涓婏紝涓�涓?SELECT 鏌ヨ鐪嬪埌涓�涓湪璇ユ煡璇㈠紑濮嬭繍琛岀殑鐬棿璇ユ暟鎹簱鐨勪竴涓揩鐓с�?璇鋒敞鎰忎袱涓浉閭?cè)潥?SELECT 鍛戒護(hù)鍙兘鐪嬪埌涓嶅悓鐨勬暟鎹紝鍝�曞畠浠槸鍦ㄥ悓涓�涓簨鍔￠噷錛?鍥犱負(fù)鍏跺畠浜嬪姟浼?xì)鍦ńW竴涓猄ELECT鎵ц鐨勬椂鍊欐彁浜わ紟 </p>
<p>UPDATE錛?DELETE錛?鎴栬�?SELECT FOR UPDATE 鍦ㄦ悳绱㈢洰鏍囪鐨勬椂鍊欑殑琛屼負(fù)鍜孲ELECT 涓�鏍鳳細(xì) 瀹冧滑鍙兘鎵懼埌鍦ㄥ懡浠ゅ紑濮嬬殑鏃跺�欏凡緇忔彁浜ょ殑琛屻�?涓嶈繃錛岃繖鏍風(fēng)殑鐩爣琛屽湪琚壘鍒扮殑鏃跺�欏彲鑳藉凡緇忚鍏跺畠騫跺彂鐨勪簨鍔℃洿鏂幫紙鎴栬�呭垹闄わ紝鎴栬�呮爣璁頒負(fù)鏇存柊鐨勶級(jí)銆?鍦ㄨ繖縐嶆儏鍐典笅錛屽嵆灝嗚繘琛岀殑鏇存柊灝嗙瓑寰呯涓�涓洿鏂頒簨鍔℃彁浜ゆ垨鑰呭洖婊氾紙濡傛灉瀹冭繕鍦ㄥ鐞嗭級(jí)銆?濡傛灉絎竴涓洿鏂板洖婊氾紝閭ｄ箞瀹冪殑浣滅敤灝嗚蹇界暐錛岃�岀浜屼釜鏇存柊鑰呭皢緇х畫鏇存柊鏈�鍒濆彂鐜扮殑琛屻�?濡傛灉絎竴涓洿鏂拌�呮彁浜わ紝閭ｄ箞濡傛灉絎竴涓洿鏂拌�呭垹闄や簡(jiǎn)璇ヨ錛屽垯絎簩涓洿鏂拌�呭皢蹇界暐璇ヨ錛?鍚﹀垯瀹冨皢璇曞浘鍦ㄨ琛岀殑宸叉洿鏂扮殑鐗堟湰涓婃柦鍔犲畠鐨勬搷浣溿�傜郴緇熷皢閲嶆柊璁＄畻鍛戒護(hù)鎼滅儲(chǔ)鏉′歡錛圵HERE 瀛愬彞錛夛紝 鐪嬬湅璇ヨ宸叉洿鏂扮殑鍔炰笉閭ｆ槸鍚︿粛鐒剁鍚堟悳绱㈡潯浠躲�傚鏋滄槸錛屽垯絎簩涓洿鏂扮戶緇叾鎿嶄綔錛屼粠璇ヨ鐨勫凡鏇存柊鐗堟湰寮�濮嬨�?</p>
<p>鍥犱負(fù)涓婇潰鐨勮鍒欙紝姝ｅ湪鏇存柊鐨勫懡浠ゅ彲鑳戒細(xì)鐪嬪埌涓嶄竴鑷寸殑蹇収 --- 瀹冧滑鍙互鐪嬪埌褰卞搷瀹冧滑璇曞浘鏇存柊鐨勫茍鍙戞洿鏂板懡浠ょ殑鏁堟灉錛?浣嗘槸瀹冧滑鐪嬩笉鍒伴偅浜涘懡浠ゅ鏁版嵁搴撻噷鍏跺畠琛岀殑浣滅敤銆?榪欐牱鐨勮涓轟護(hù)璇誨凡鎻愪氦妯″紡涓嶉�傚悎鐢ㄤ簬鍝娑夊強(qiáng)澶嶆潅鎼滅儲(chǔ)鏉′歡鐨勫懡浠ゃ�?涓嶈繃錛屽畠瀵逛簬綆�鍗曠殑鎯呭喌鑰岃█鏄紜殑銆傛瘮濡傦紝鍋囪鎴戜滑鐢ㄧ被浼間笅闈㈣繖鏍風(fēng)殑鍛戒護(hù)鏇存柊閾惰浣欓錛?</p>
<p>BEGIN; UPDATE accounts SET balance = balance + 100.00 WHERE acctnum = 12345; UPDATE accounts SET balance = balance - 100.00 WHERE acctnum = 7534; COMMIT;濡傛灉涓や釜騫跺彂浜嬪姟璇曞浘淇敼甯愬彿 12345 鐨勪綑棰濓紝閭ｆ垜浠緢鏄庢樉甯屾湜絎簩涓簨鍔℃槸浠庡笎鎴瘋鐨勫凡緇忔洿鏂拌繃鐨勭増鏈笂榪涜鏇存柊銆?鍥犱負(fù)姣忎釜鍛戒護(hù)鍙槸褰卞搷涓�涓凡緇忓喅瀹氫簡(jiǎn)鐨勮錛屽洜姝よ瀹冪湅鍒版洿鏂板悗鐨勭増鏈笉浼?xì)瀵艰嚧鋼Q浣曚笉涓�鑷寸殑闂銆?</p>
<p>鍥犱負(fù)鍦ㄨ宸叉彁浜ゆā寮忛噷錛屾瘡涓柊鐨勫懡浠ら兘鏄粠涓�涓柊鐨勫揩鐓у紑濮嬬殑錛岃�岃繖涓揩鐓у寘鍚墍鏈夊埌璇ユ椂鍒諱負(fù)姝㈠凡緇忔彁浜ょ殑浜嬪姟錛?鍥犳鍚屼竴涓簨鍔￠噷鐨勫悗闈㈢殑鍛戒護(hù)灝嗙湅鍒頒換浣曞凡鎻愪氦鐨勫茍鍙戜簨鍔＄殑鏁堟灉銆?榪欓噷瑕佽�冭檻鐨勯棶棰樻槸鎴戜滑鍦ㄤ竴涓懡浠ら噷鏄惁鐪嬪埌鏁版嵁搴撻噷緇濆涓�鑷寸殑瑙嗗浘銆?</p>
<p>璇誨凡鎻愪氦妯″紡鎻愪緵鐨勯儴鍒嗕簨鍔￠殧紱誨浜庤澶氬簲鐢ㄨ�岃█鏄凍澶熺殑錛屽茍涓旇繖涓ā寮忛�熷害蹇紝浣跨敤綆�鍗曘�?涓嶈繃錛屽浜庡仛澶嶆潅鏌ヨ鍜屾洿鏂扮殑搴旂敤錛屽彲鑳介渶瑕佷繚璇佹暟鎹簱鏈夋瘮璇誨凡鎻愪氦妯″紡鎻愪緵鐨勬洿鍔犱弗鏍肩殑涓�鑷存�ц鍥俱�?</p>
<p>12.2.2. 鍙覆琛屽寲闅旂綰у埆<br />
鍙覆琛屽寲錛圫erializable錛?綰у埆鎻愪緵鏈�涓ユ牸鐨勪簨鍔￠殧紱匯�?榪欎釜綰у埆妯℃嫙涓茶鐨勪簨鍔℃墽琛岋紝 灝卞ソ璞′簨鍔″皢琚竴涓帴鐫�涓�涓偅鏍蜂覆琛岀殑錛岃�屼笉鏄茍琛岀殑鎵ц銆?涓嶈繃錛屼嬌鐢ㄨ繖涓駭鍒殑搴旂敤蹇呴』鍑嗗鍦ㄤ覆琛屽寲澶辮觸鐨勬椂鍊欓噸鏂板彂鍔ㄤ簨鍔★紟 </p>
<p>褰撲竴涓簨鍔″浜庡彲涓茶鍖栫駭鍒紝 涓�涓?SELECT 鏌ヨ鍙兘鐪嬪埌鍦ㄤ簨鍔″紑濮嬩箣鍓嶆彁浜ょ殑鏁版嵁鑰屾案榪滅湅涓嶅埌鏈彁浜ょ殑鏁版嵁鎴栦簨鍔℃墽琛屼腑鍏朵粬騫惰浜嬪姟鎻愪氦鐨勪慨鏀廣�?錛堜笉榪囷紝SELECT 鐨勭‘鐪嬪緱鍒板悓涓�嬈′簨鍔′腑鍓嶉潰鐨勬洿鏂扮殑鏁堟灉銆傚嵆浣夸簨鍔¤繕娌℃湁鎻愪氦涔熶竴鏍楓�傦級(jí) 榪欎釜琛屼負(fù)鍜岃宸叉彁浜ょ駭鍒槸涓嶅お涓�鏍鳳紝瀹冪殑 SELECT 鐪嬪埌鐨勬槸璇ヤ簨鍔″紑濮嬫椂鐨勫揩鐓э紝鑰屼笉鏄浜嬪姟鍐呴儴褰撳墠鏌ヨ寮�濮嬫椂鐨勫揩鐓с�?榪欐牱錛屼竴涓簨鍔″唴閮ㄥ悗闈㈢殑 SELECT 鍛戒護(hù)鎬繪槸鐪嬪埌鍚屾牱鐨勬暟鎹�?</p>
<p>UPDATE錛?DELETE錛屽拰 SELECT FOR UPDATE 鍦ㄦ悳绱㈢洰鏍囪涓婄殑琛屼負(fù)鍜?SELECT 涓�鏍鳳細(xì) 瀹冧滑灝嗗彧瀵繪壘鍦ㄤ簨鍔″紑濮嬬殑鏃跺�欏凡緇忔彁浜ょ殑鐩爣琛屻�備絾鏄紝 榪欐牱鐨勭洰鏍囪鍦ㄨ鍙戠幇鐨勬椂鍊欏彲鑳藉凡緇忚鍙﹀涓�涓茍鍙戠殑浜嬪姟鏇存柊浜?jiǎn)锛堟垨鑰呮槸鍒犻櫎鎴栬�呮槸鏍囪涓烘洿鏂幫級(jí)銆?鍦ㄨ繖縐嶆儏鍐典笅錛屽彲涓茶鍖栫殑浜嬪姟灝嗙瓑寰呯涓�涓鍦ㄦ洿鏂扮殑浜嬪姟鎻愪氦鎴栬�呭洖婊氾紙濡傛灉瀹冧粛鐒跺湪澶勭悊涓級(jí)銆?濡傛灉絎竴涓洿鏂拌�呭洖婊氾紝閭ｄ箞瀹冪殑褰卞搷灝嗚蹇界暐錛?鑰岃繖涓彲涓茶鍖栫殑灝卞彲浠ョ戶緇洿鏂板畠鏈�鍒濆彂鐜扮殑琛屻�?浣嗘槸濡傛灉絎竴涓洿鏂拌�呮彁浜や簡(jiǎn)錛堝茍涓斿疄闄呬笂鏇存柊鎴栬�呭垹闄や簡(jiǎn)璇ヨ錛岃�屼笉鍙槸涓烘洿鏂伴�変腑瀹冿級(jí)閭ｄ箞鍙覆琛屽寲浜嬪姟灝嗗洖婊氾紝騫惰繑鍥炰笅闈俊鎭?</p>
<p>ERROR: Can't serialize access due to concurrent update鍥犱負(fù)涓�涓彲涓茶鍖栫殑浜嬪姟鍦ㄥ彲涓茶鍖栦簨鍔″紑濮嬩箣鍚庝笉鑳芥洿鏀硅鍏朵粬浜嬪姟鏇存敼榪囩殑琛屻�?</p>
<p>褰撳簲鐢ㄦ敹鍒拌繖鏍風(fēng)殑閿欒淇℃伅鏃訛紝瀹冨簲璇ラ��鍑哄綋鍓嶇殑浜嬪姟鐒跺悗浠庡ご寮�濮嬮噸鏂拌繘琛屾暣涓簨鍔°�?絎簩嬈¤繍琛屾椂錛岃浜嬪姟鐪嬪埌鐨勫墠涓�嬈℃彁浜ょ殑淇敼鏄鏁版嵁搴撳垵濮嬬殑鏍峰瓙涓殑涓�閮ㄥ垎錛?鎵�浠ユ妸鏂扮増鏈殑琛屼綔涓烘柊浜嬪姟鏇存柊鐨勮搗鐐逛笉浼?xì)鏈夐�昏緫鍐茬獊銆?</p>
<p>璇鋒敞鎰忓彧鏈夋洿鏂頒簨鍔℃墠闇�瑕侀噸璇曪紝鍙浜嬪姟浠庢潵娌℃湁涓茶鍖栧啿紿侊紟 </p>
<p>鍙覆琛屽寲浜嬪姟綰у埆鎻愪緵浜?jiǎn)涓ユ牸鐨勪繚璇佸Q氭瘡涓簨鍔￠兘鐪嬪埌涓�涓畬鍏ㄤ竴鑷寸殑鏁版嵁搴撶殑瑙嗗浘銆?涓嶈繃錛屽鏋滃茍琛屾洿鏂頒護(hù)鏁版嵁搴撲笉鑳界淮鎸佷覆琛屾墽琛岀殑鏍峰瓙錛岄偅涔堝簲鐢ㄥ繀欏誨噯澶囬噸璇曚簨鍔°�?鍥犱負(fù)閲嶅仛澶嶆潅鐨勪簨鍔＄殑寮�閿�鍙兘鏄潪甯稿彲瑙傜殑錛屾墍浠ユ垜浠彧寤鴻鍦ㄦ洿鏂板懡浠や腑鍖呭惈瓚沖澶嶆潅鐨勯�昏緫錛?鍦ㄨ宸叉彁浜ょ駭鍒腑鍙兘瀵艱嚧閿欒鐨勭粨鏋滅殑鎯呭喌涓嬫墠浣跨敤銆?鏈�甯歌鐨勬槸錛屽彲涓茶鍖栨ā寮忓彧鏄湪榪欐牱鐨勬儏鍐典笅鏄繀瑕佺殑錛氫竴涓簨鍔¤繛緇仛鑻ュ共涓懡浠わ紝 鑰岃繖鍑犱釜鍛戒護(hù)蹇呴』鐪嬪埌鏁版嵁搴撳畬鍏ㄤ竴鏍風(fēng)殑瑙嗗浘銆?/p>
<p><br />
鏈枃鏉ヨ嚜CSDN鍗氬錛岃漿杞借鏍囨槑鍑哄錛歨ttp://blog.csdn.net/lanbaibai/archive/2004/06/29/29547.aspx</p>
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