Posted 2021-04-01 绋嬪簭IT鍦?/a> 闈㈣瘯

鐐逛笂闈煈?nbsp;钃濊壊瀛椾綋 鍏虫敞鎴戝憖

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浠婂ぉ鏉ヨ亰涓€鑱?Mysql 缂撳瓨姹犲師鐞嗐€?/span>

鎻愮翰闄勪笂锛岃瘽涓嶅璇达紝鐩存帴骞茶揣銆?/span>

鍓嶈█

闈㈣瘯瀹橈細鍚屽锛屼綘鑳借璇碝ysql 缂撳瓨姹犲悧锛?br>

鐙傝亰鍚涳細鍟婏紝杩欎箞闅惧悧锛屽鎴戠粍缁囦竴涓嬭瑷€銆傦紙鍐呭績OS锛?span class="mq-20">杩橳M杩樹笉绠€鍗曪紵鎴戣兘缁欎綘鎵崐灏忔椂锛?/span>锛?/span>

闈㈣瘯瀹橈細鍙互锛岀粰浣犱竴鍒嗛挓鏃堕棿鎯充竴鎯冲惂銆?br>

....涓€鍒嗛挓鍚?...

鐙傝亰鍚涳細鎴戝噯澶囧ソ浜嗭紝浣犲彲鍚ソ锛屾垜瑕佸紑濮嬭〃婕斾簡銆?/span>

涓轰粈涔堣鏈夌紦瀛樻睜锛?br>

Mysql 鐨?innodb 瀛樺偍寮曟搸鏄熀浜庣鐩樺瓨鍌ㄧ殑锛屽苟涓旀槸鎸夌収椤电殑鏂瑰紡杩涜绠＄悊鐨勩€?/span>

鍦ㄦ暟鎹簱绯荤粺涓紝CPU 閫熷害涓庣鐩橀€熷害涔嬮棿鐨勫樊璺濇槸闈炲父澶х殑锛屼负浜嗘渶澶у彲鑳界殑寮ヨˉ涔嬮棿鐨勫樊璺濓紝鎻愬嚭浜嗙紦瀛樻睜鐨勬蹇点€?/span>

鎵€浠ョ紦瀛樻睜锛岀畝鍗曟潵璇村氨鏄竴鍧?span>銆屽唴瀛樺尯鍩熴€?/strong>锛岄€氳繃鍐呭瓨鐨勯€熷害鏉ュ讥琛ョ鐩橀€熷害杈冩參锛屽鑷村鏁版嵁搴撻€犳垚鎬ц兘鐨勫奖鍝嶃€?/span>

缂撳瓨姹犵殑鍩烘湰鍘熺悊

銆岃鎿嶄綔銆?/strong>:

鍦ㄦ暟鎹簱涓繘琛岃鍙栭〉鐨勬搷浣滐紝棣栧厛鎶婁粠纾佺洏璇诲埌鐨勯〉瀛樻斁鍦ㄧ紦瀛樻睜涓紝涓嬩竴娆¤鍙栫浉鍚岀殑椤垫椂锛岄鍏堝垽鏂椤垫槸涓嶆槸鍦ㄧ紦瀛樻睜涓€?/span>

鑻ュ湪锛岀О璇ラ〉鍦ㄧ紦瀛樻睜涓鍛戒腑锛屽垯鐩存帴璇诲彇璇ラ〉锛屽惁鍒欙紝杩樻槸鍘昏鍙栫鐩樹笂鐨勯〉銆?/span>

銆屽啓鎿嶄綔銆?/strong>:

瀵逛簬鏁版嵁搴撲腑椤电殑淇敼鎿嶄綔锛岄鍏堜慨鏀瑰湪缂撳瓨姹犱腑鐨勯〉锛岀劧鍚庡湪浠ヤ竴瀹氱殑棰戠巼鍒锋柊鍒扮鐩橈紝骞朵笉鏄瘡娆￠〉鍙戠敓鏀瑰彉灏卞埛鏂板洖纾佺洏锛岃€屾槸閫氳繃 checkpoint 鐨勬満鍒舵妸椤靛埛鏂板洖纾佺洏銆?/span>

鍙互鐪嬪埌锛屾棤璁烘槸璇绘搷浣滆繕鏄啓鎿嶇旱锛岄兘鏄缂撳瓨姹犺繘琛屾搷浣滐紝鑰屼笉鏄洿鎺ュ纾佺洏杩涜鎿嶇旱銆?/strong>

缂撳瓨姹犵粨鏋?/span>

Buffer Pool 鏄竴鐗囪繛缁殑鍐呭瓨绌洪棿锛宨nnodb 瀛樺偍寮曟搸鏄€氳繃椤电殑鏂瑰紡瀵硅繖鍧楀唴瀛樿繘琛岀鐞嗙殑銆?/span>

缂撳瓨姹犵殑缁撴瀯濡備笅鍥撅細

鍙互鐪嬪埌缂撳瓨姹犱腑鍖呮嫭鏁版嵁椤点€佺储寮曢〉銆佹彃鍏ョ紦瀛樸€佽嚜閫傚簲鍝堝笇绱㈠紩銆侀攣淇℃伅銆佹暟鎹瓧娈点€?/span>

鍏朵腑鏁版嵁椤靛拰绱㈠紩椤典細鐢ㄦ帀澶氭暟鍐呭瓨銆?/span>

銆屼絾鏄紝innodb 鏄浣曠鐞嗙紦瀛樻睜涓殑杩欎箞澶氶〉鍛紵銆?/strong>

涓轰簡鏇村ソ鐨勭鐞嗚繖浜涚紦瀛樼殑椤碉紝innodb 涓烘瘡涓€涓紦瀛橀〉閮藉垱寤轰簡涓€浜涙墍璋撶殑鎺у埗淇℃伅锛岃繖浜涙帶鍒朵俊鎭寘鎷椤垫墍灞炵殑锛?/span>

• 琛ㄧ┖闂寸紪鍙?sapce id)
• 椤靛彿(page numeber)
• 椤靛湪 buffer Pool 鐨勫湴鍧€
• 涓€浜涢攣淇℃伅浠ュ強 LSN 淇℃伅鏃ュ織搴忓垪鍙?/span>
• 鍏朵粬鎺у埗淇℃伅

姣忎釜缂撳瓨椤靛搴旂殑鎺у埗淇℃伅鍗犵敤鐨勫唴瀛樺ぇ灏忔槸鐩稿悓鐨勶紝鎴戜滑鎶婃瘡涓〉瀵瑰簲鐨勬帶鍒朵俊鎭崰鐢ㄧ殑涓€鍧楀唴瀛樼О涓轰竴涓?span>銆屾帶鍒跺潡銆嶃€?/strong>

銆屾帶鍒跺潡銆?/strong>鍜岀紦瀛橀〉鏄竴涓€瀵瑰簲鐨勶紝瀹冧滑閮借瀛樻斁鍒?Buffer Pool 涓紝鍏朵腑鎺у埗鍧楄瀛樻斁鍒?Buffer Pool 鐨勫墠杈癸紝缂撳瓨椤佃瀛樻斁鍒?Buffer Pool 鐨勫悗杈广€?/span>

Buffer Pool 瀵瑰簲鐨勫唴瀛樼┖闂寸ず鎰忓浘锛?/span>

缂撳瓨姹犲弬鏁拌缃?/span>

• innodb_buffer_pool_size锛氱紦瀛樻睜鐨勫ぇ灏忔渶澶氬簲璁剧疆涓虹墿鐞嗗唴瀛樼殑 80%
• innodb_buffer_pool_instance锛氳缃湁澶氬皯涓紦瀛樻睜锛岄€氬父寤鸿鎶婄紦瀛樻睜涓暟璁剧疆涓?CPU 鐨勪釜鏁帮紝澶氫釜缂撳瓨姹犲彲浠ュ噺灏戞暟鎹簱鍐呴儴鐨勮祫婧愮珵浜夛紝澧炲姞鏁版嵁搴撳苟鍙戣闂殑鑳藉姏
• innodb_old_blocks_pct锛氳€佺敓浠ｅ崰鏁翠釜 LRU 鐨勯摼闀挎瘮渚嬶紝榛樿鏄?3锛?
• innodb_old_blocks_time锛氳€佺敓浠ｅ仠鐣欐椂闂寸獥鍙ｏ紝鍗曚綅鏄绉掞紝榛樿鏄?1000锛屽嵆鍚屾椂婊¤冻鈥滆璁块棶鈥濅笌鈥滃湪鑰佺敓浠ｅ仠鐣欐椂闂磋秴杩?1 绉掆€濅袱涓潯浠讹紝鎵嶄細琚彃鍏ュ埌鏂扮敓浠ｅご閮?/span>

缂撳瓨姹犵鐞?/span>

銆岀鐞嗙紦瀛樻睜渚濊禆鐨勯摼琛ㄧ粨鏋勩€嶏細

Free 閾捐〃

褰撳惎鍔?Mysql 鏈嶅姟鍣ㄧ殑鏃跺€欙紝闇€瑕佸畬鎴愬 Buffer Pool 鐨勫垵濮嬪寲杩囩▼锛屽嵆鍒嗛厤 Buffer Pool 鐨勫唴瀛樼┖闂达紝鎶婂畠鍒掑垎涓鸿嫢骞插鎺у埗鍧楀拰缂撳瓨椤碉紝浣嗘槸姝ゆ椂骞舵病鏈夌湡姝ｇ殑纾佺洏椤佃缂撳瓨鍒?Buffer Pool 涓紝涔嬪悗闅忕潃绋嬪簭鐨勮繍琛岋紝浼氫笉鏂殑鏈夌鐩樹笂鐨勯〉琚紦瀛樺埌 Buffer Pool 涓€?/span>

鍦ㄤ娇鐢ㄨ繃绋嬩腑锛屼负浜嗚褰曞摢浜涚紦瀛橀〉鏄彲鐢ㄧ殑锛屾垜浠妸鎵€鏈夌┖闂茬殑椤靛寘瑁呮垚涓€涓妭鐐圭粍鎴愪竴涓摼琛紝杩欎釜閾捐〃鍙互绉颁綔涓?Free 閾捐〃锛堢┖闂查摼琛級銆傚洜涓哄垰鍒氬畬鎴愬垵濮嬪寲鐨?Buffer Pool 涓墍鏈夌殑缂撳瓨椤甸兘鏄┖闂茬殑锛屾墍浠ユ瘡涓€涓紦瀛橀〉閮戒細琚姞鍏ュ埌 Free 閾捐〃涓€?/span>

缁欏ぇ瀹剁敾浜嗕釜缁撴瀯鍥撅細

杩欏浘鎬庝箞鏍凤紝杩欎笅鑳界湅鐨勬噦浜嗗惂锛?/span>

2銆丩ru 閾捐〃

Lru 閾捐〃鐢ㄦ潵绠＄悊宸茬粡璇诲彇鐨勯〉锛屽綋鏁版嵁搴撳垰鍚姩鏃讹紝Lru 閾捐〃鏄┖鐨勶紝姝ゆ椂椤典篃閮芥斁鍦?Free 鍒楄〃涓紝褰撻渶瑕佽鍙栨暟鎹椂锛屼細浠?Free 閾捐〃涓敵璇蜂竴涓〉锛屾妸浠庢斁鍏ュ埌纾佺洏璇诲彇鐨勬暟鎹斁鍏ュ埌鐢宠鐨勯〉涓紝杩欎釜椤电殑闆嗗悎鍙仛 Lru 閾捐〃銆?/span>

3銆丗lush 閾捐〃

Flush 閾捐〃鐢ㄦ潵绠＄悊琚慨鏀圭殑椤碉紝Buffer Pool 涓淇敼鐨勯〉涔熻绉颁箣涓?span>銆岃剰椤点€?/strong>锛岃剰椤垫棦瀛樺湪浜?Lru 閾捐〃涓紝涔熷瓨鍦ㄤ簬 Flush 閾捐〃涓紝Flush 閾捐〃涓瓨鐨勬槸涓€涓寚鍚?Lru 閾捐〃涓叿浣撴暟鎹殑鎸囬拡銆?/span>

鍥犳鍙湁 Lru 閾捐〃涓殑椤电涓€娆¤淇敼鏃讹紝瀵瑰簲鐨勬寚閽堟墠浼氬瓨鍏ュ埌 Flush 涓紝鑻ヤ箣鍚庡啀淇敼杩欎釜椤碉紝鍒欐槸鐩存帴鏇存柊 Lru 閾捐〃涓殑椤靛搴旂殑鏁版嵁銆?/span>

杩欎笁鑰呬箣闂存槸杩欎箞涓叧绯伙細

璇绘搷浣?/span>

Buffer Pool 涓€涓渶涓昏鐨勫姛鑳芥槸銆屽姞閫熻銆?/strong>銆傚姞閫熻鏄綋闇€瑕佽闂竴涓暟鎹〉闈㈢殑鏃跺€欙紝濡傛灉杩欎釜椤甸潰宸茬粡鍦ㄧ紦瀛樻睜涓紝閭ｄ箞灏变笉鍐嶉渶瑕佽闂鐩橈紝鐩存帴浠庣紦鍐叉睜涓氨鑳借幏鍙栬繖涓〉闈㈢殑鍐呭銆傚綋鎴戜滑闇€瑕佽闂煇涓〉涓殑鏁版嵁鏃讹紝灏变細鎶婅椤靛姞杞藉埌 Buffer Pool 涓紝濡傛灉璇ラ〉宸茬粡鍦?Buffer Pool 涓殑璇濈洿鎺ヤ娇鐢ㄥ氨鍙互浜嗐€?/span>

闂锛氶偅涔堝浣曞揩閫熸煡鎵惧湪 Buffer Pool 涓殑椤靛憿锛?/strong>

涓轰簡閬垮厤鏌ヨ鏁版嵁椤垫椂鎵弿 Lru锛屽叾瀹炴槸鏍规嵁琛ㄧ┖闂村彿 + 椤靛彿鏉ュ畾浣嶄竴涓〉鐨勶紝涔熷氨鐩稿綋浜庤〃绌洪棿鍙?+ 椤靛彿鏄竴涓?key锛岀紦瀛橀〉灏辨槸瀵瑰簲鐨?value銆傜敤琛ㄧ┖闂村彿 + 椤靛彿浣滀负 key锛岀紦瀛橀〉浣滀负 value 鍒涘缓涓€涓搱甯岃〃锛屽湪闇€瑕佽闂煇涓〉鐨勬暟鎹椂锛屽厛浠庡搱甯岃〃涓牴鎹〃绌洪棿鍙?+ 椤靛彿鐪嬬湅鏈夋病鏈夊搴旂殑缂撳瓨椤点€?/span>

濡傛灉鏈夛紝鐩存帴浣跨敤璇ョ紦瀛橀〉灏卞ソ銆?/span>

濡傛灉娌℃湁锛岄偅灏变粠 Free 閾捐〃涓€変竴涓┖闂茬殑缂撳瓨椤碉紝鐒跺悗鎶婄鐩樹腑瀵瑰簲鐨勯〉鍔犺浇鍒拌缂撳瓨椤电殑浣嶇疆銆傛瘡褰撻渶瑕佷粠纾佺洏涓姞杞戒竴涓〉鍒?Buffer Pool 涓椂锛屽氨浠?Free 閾捐〃涓彇涓€涓┖闂茬殑缂撳瓨椤碉紝骞朵笖鎶婅缂撳瓨椤靛搴旂殑鎺у埗鍧楃殑淇℃伅濉笂锛岀劧鍚庢妸璇ョ紦瀛橀〉瀵瑰簲鐨?Free 閾捐〃鑺傜偣浠庨摼琛ㄤ腑绉婚櫎锛岃〃绀鸿缂撳瓨椤靛凡缁忚浣跨敤浜嗭紝骞朵笖鎶婅椤靛啓鍏?Lru 閾捐〃銆?/span>

鍦ㄥ垵濮嬪寲鐨勬椂鍊欙紝Buffer pool 涓墍鏈夌殑椤甸兘鏄┖闂查〉锛岄渶瑕佽鏁版嵁鏃讹紝灏变細浠?Free 閾捐〃涓敵璇烽〉锛屼絾鏄墿鐞嗗唴瀛樹笉鍙兘鏃犻檺澧炲ぇ锛屾暟鎹簱鐨勬暟鎹嵈鏄湪涓嶅仠澧炲ぇ鐨勶紝鎵€浠?Free 閾捐〃鐨勯〉鏄細鐢ㄥ畬鐨勩€?/span>

鍥犳闇€瑕佽€冭檻鎶婂凡缁忕紦瀛樼殑椤典粠 Buffer pool 涓垹闄や竴閮ㄥ垎锛岃繘鑰岄渶瑕佽€冭檻濡備綍鍒犻櫎鍙婂垹闄ゅ摢浜涘凡缁忕紦瀛樼殑椤点€傚亣璁句竴鍏辫闂簡 n 娆￠〉锛岄偅涔堣璁块棶鐨勯〉鍦ㄧ紦瀛樹腑鐨勬鏁伴櫎浠?n 灏辨槸缂撳瓨鍛戒腑鐜囷紝缂撳瓨鍛戒腑鐜囪秺楂橈紝鍜岀鐩樼殑 IO 浜や簰涔熷氨瓒婂皯 銆?/span>

涓轰簡鎻愰珮缂撳瓨鍛戒腑鐜囷紝InnoDB 鍦ㄤ紶缁?Lru 绠楁硶鐨勫熀纭€涓婂仛浜嗕紭鍖栵紝瑙ｅ喅浜嗕袱涓棶棰橈細1銆侀璇诲け鏁?2銆佺紦瀛樻睜姹℃煋

鍐欐搷浣?/span>

Buffer pool 鍙︿竴涓富瑕佺殑鍔熻兘鏄?span>銆屽姞閫熷啓銆?/strong>锛屽嵆褰撻渶瑕佷慨鏀逛竴涓〉闈㈢殑鏃跺€欙紝鍏堝皢杩欎釜椤甸潰鍦ㄧ紦鍐叉睜涓繘琛屼慨鏀癸紝璁颁笅鐩稿叧鐨勯噸鍋氭棩蹇楋紝杩欎釜椤甸潰鐨勪慨鏀瑰氨绠楀凡缁忓畬鎴愪簡銆?/span>

琚慨鏀圭殑椤甸潰鐪熸鍒锋柊鍒扮鐩橈紝杩欎釜鏄悗鍙板埛鏂扮嚎绋嬫潵瀹屾垚鐨勩€傚墠闈㈤〉闈㈡洿鏂版槸鍦ㄧ紦瀛樻睜涓厛杩涜鐨勶紝閭ｅ畠灏卞拰纾佺洏涓婄殑椤典笉涓€鑷翠簡锛岃繖鏍风殑缂撳瓨椤佃绉颁负鑴忛〉锛坉irty page锛夈€?/span>

闂锛氳繖浜涜淇敼鐨勯〉闈粈涔堟椂鍊欏埛鏂板埌纾佺洏锛熶互浠€涔堟牱鐨勯『搴忓埛鏂板埌纾佺洏锛?/strong>

鏈€绠€鍗曠殑鍋氭硶灏辨槸姣忓彂鐢熶竴娆′慨鏀瑰氨绔嬪嵆鍚屾鍒扮鐩樹笂瀵瑰簲鐨勯〉涓婏紝浣嗘槸棰戠箒鐨勫線纾佺洏涓啓鏁版嵁浼氫弗閲嶇殑褰卞搷绋嬪簭鐨勬€ц兘銆傛墍浠ユ瘡娆′慨鏀圭紦瀛橀〉鍚庯紝涓嶈兘绔嬪嵆鎶婁慨鏀瑰悓姝ュ埌纾佺洏涓婏紝鑰屾槸鍦ㄦ湭鏉ョ殑鏌愪釜鏃堕棿鐐硅繘琛屽悓姝ワ紝鐢卞悗鍙板埛鏂扮嚎绋嬩緷娆″埛鏂板埌纾佺洏锛屽疄鐜颁慨鏀硅惤鍦板埌纾佺洏銆?/span>

浣嗘槸濡傛灉涓嶇珛鍗冲悓姝ュ埌纾佺洏鐨勮瘽锛岄偅涔嬪悗鍐嶅悓姝ョ殑鏃跺€欏浣曞垽鏂?Buffer Pool 涓摢浜涢〉鏄剰椤碉紝鍝簺椤典粠鏉ユ病琚慨鏀硅繃鍛紵

InnoDB 骞舵病鏈変竴娆℃€ф妸鎵€鏈夌殑缂撳瓨椤甸兘鍚屾鍒扮鐩樹笂锛孖nnoDB 鍒涘缓涓€涓瓨鍌ㄨ剰椤电殑閾捐〃锛屽嚒鏄湪 Lru 閾捐〃涓淇敼杩囩殑椤甸兘闇€瑕佸姞鍏ヨ繖涓摼琛ㄤ腑锛屽洜涓鸿繖涓摼琛ㄤ腑鐨勯〉閮芥槸闇€瑕佽鍒锋柊鍒扮鐩樹笂鐨勶紝鎵€浠ヨ繖涓摼琛ㄤ篃鍙?Flush 閾捐〃锛岄摼琛ㄧ殑鏋勯€犲拰 Free 閾捐〃涓€鑷淬€?/span>

杩欓噷鐨勮剰椤典慨鏀规寚鐨勬椤佃鍔犺浇杩?Buffer Pool 鍚庣涓€娆¤淇敼锛屽彧鏈夌涓€娆¤淇敼鏃舵墠闇€瑕佸姞鍏?Flush 閾捐〃锛屽浜庡凡缁忓瓨鍦ㄥ湪 Flush 閾捐〃涓殑椤碉紝濡傛灉杩欎釜椤佃鍐嶆淇敼灏变笉浼氬啀鏀惧埌 Flush 閾捐〃銆?/span>

闇€瑕佹敞鎰忥紝鑴忛〉鏁版嵁瀹為檯杩樺湪 Lru 閾捐〃涓紝鑰?Flush 閾捐〃涓殑鑴忛〉璁板綍鍙槸閫氳繃鎸囬拡鎸囧悜 Lru 閾捐〃涓殑鑴忛〉銆傚苟涓斿湪 Flush 閾捐〃涓殑鑴忛〉鏄牴鎹?oldest_lsn锛堣繖涓€艰〃绀鸿繖涓〉绗竴娆¤鏇存敼鏃剁殑 lsn 鍙凤紝瀵瑰簲鍊?oldest_modification锛屾瘡涓〉澶撮儴璁板綍锛夎繘琛屾帓搴忓埛鏂板埌纾佺洏鐨勶紝鍊艰秺灏忚〃绀鸿鏈€鍏堣鍒锋柊锛岄伩鍏嶆暟鎹笉涓€鑷淬€?/span>

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闈㈣瘯瀹橈細琛岋紝鍥炵瓟鐨勮繕鍑戝悎銆傦紙鍐呭績OS锛氳繖灏忓瓙鐭ラ亾鐨勮繕鎸哄鍟婏紒锛?/span>

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娆㈣繋鍦ㄧ湅銆佺偣璧炪€佽浆鍙戙€佹偍鐨勮鍙槸鎴戝師鍒涚殑鍔ㄥ姏锛?/span>

  
    
    
  

   
     
     
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