AWR涓殑涓昏浜嬩欢鍒嗘瀽绮捐

Posted 2021-02-21

鏍囩锛?a href='http://www.mamicode.com/so/1/%e6%96%b9%e6%b3%95' title='鏂规硶'>鏂规硶   head   color   sts   err   new   success   array   via   

AWR涓殑涓昏浜嬩欢鍒嗘瀽绮捐

Linux鎿嶄綔绯荤粺 浣滆€咃細缇藉寲娈嬭櫣 鏃堕棿锛?017-03-03 12:00:52 180 0

  鐜板湪寰堝DBA閮介槄璇诲拰鍒嗘瀽STATSPACK/AWR鎶ュ憡锛屼笉杩囪繖浠芥姤鍛婂彲涓嶅鏄撹銆備竴鑸殑DBA椤跺鑳藉鐪嬬湅鍓嶉潰鐨?span>TOP EVENTS锛屽懡涓巼浠ュ強鍚庨潰鐨勪竴浜?span>ADVISORY锛岃€屽疄闄呬笂绯荤粺鐨勬洿澶氱殑绉樺瘑瀛樺湪浜庨偅浜涚湅璧锋潵鍗佸垎鐢熸订鐨?span>InstanceActivity Stats涓€備絾鏄浜庤繖浜?span>STATS锛屽ぇ澶氭暟DBA閮芥劅鍒板緢鏃犲锛屾病鏈変换浣曞畼鏂圭殑璧勬枡鎶湶杩欎簺STATS鐨勫惈涔夛紝鏈変簺DBA缁忚繃闀垮勾鐨勭Н绱紝鍙互浠庡瓧闈㈡剰鎬濅笂瀵规煇浜涙寚鏍囪繘琛屼竴浜涜В璇汇€傝繖浜涘勾閲岋紝鑰佺櫧闃呰浜嗘暟鍗冧唤鐨?span>STATSPACK/AWR鎶ュ憡锛岀粡杩囬暱鏈熺殑绉疮锛岃€佺櫧鎬荤粨浜嗕竴浜涢槄璇?span>STATS鐨勭粡楠岋紝鍦ㄦ湰鑺傦紝灏嗘嬁鍑烘潵鍜屽ぇ瀹跺垎浜€?/span>

       缁忓父鏈?span>DBA闂€佺櫧鏌愭煇鎸囨爣澶氬ぇ鏄笉姝ｅ父鐨勶紝瀹為檯涓婄敱浜庢瘡涓郴缁熺殑纭欢閰嶇疆銆佸簲鐢ㄣ€佸懆鏈熸€ц妭濂忕瓑鏂归潰閮藉瓨鍦ㄤ笉鍚岋紝鍥犳缁濆ぇ澶氭暟鏁版嵁搴撶殑鎸囨爣閮芥病鏈変竴涓?span>“姝ｅ父鍊?span>”銆傚綋鐒跺浜庨偅浜涙帴瑙﹁繃澶ч噺绯荤粺鐨勮€?span>DBA锛屼粬浠彲浠ユ牴鎹粡楠岋紝涓€鎵撶溂灏辩湅鍑烘煇浜涙寚鏍囦笉澶甯革紝浣嗘槸瀵逛簬缁濆ぇ澶氭暟DBA鏉ヨ锛岀湅鍒拌繖浜涙寚鏍囧氨鍍忕湅澶╀功涓€鏍凤紝鍝€曠煡閬撹繖浜涙寚鏍囩殑鍚箟锛屼篃鏃犳硶浣跨敤杩欎簺鎸囨爣鏉ュ垎鏋愭暟鎹簱鐨勯棶棰樸€傚湪杩欓噷鑰佺櫧鍙互鍚戝ぇ瀹堕€忔紡涓€涓崄鍒嗘湁鐢ㄧ殑鏂规硶銆?/span>

       杩欎釜鏂规硶瀹為檯涓婁篃寰堢畝鍗曪紝灏辨槸鑰佺櫧甯歌鐨勫熀绾垮姣旂殑鏂规硶銆傚浜庝竴涓郴缁燂紝濡傛灉浣犱负浣曠殑鏃堕棿瓒婇暱锛岃秺浜嗚В绯荤粺鐨勮劸姘旓紝閭ｄ箞杩欎釜绯荤粺鍑虹幇闂鐨勬椂鍊欎綘澶勭悊璧锋潵瓒婂緱蹇冨簲鎵嬨€傝€屼竴涓柊绯荤粺锛屽緢澶?span>DBA鍙兘瑙夊緱濂藉儚鏃犱粠鍏ユ墜锛屽緢闅炬懜鍒板ご鑴戙€傝繖鏄粈涔堝師鍥犲憿锛熷疄闄呬笂锛屼竴涓綘鎺ヨЕ澶氱殑绯荤粺锛屽湪浣犵殑蹇冪悊宸茬粡瀵硅繖涓郴缁熷缓绔嬩簡寰堝鍩虹嚎鎸囨爣锛岃繖鏍风殑璇濆鏋滅郴缁熷嚭浜嗛棶棰橈紝浣犲氨寰堝鏄撻€氳繃鍜屽钩鏃剁殑姣旇緝鎵惧埌闂銆傚疄闄呬笂浣犲凡缁忓湪瀹為檯宸ヤ綔涓娇鐢ㄤ簡鑰佺櫧鎵€璇寸殑鍩虹嚎瀵规瘮鏂规硶銆傚熀绾垮姣旀柟娉曠殑鍩虹鏄鏌愪釜绯荤粺閫氳繃涓€娈垫椂闂寸殑淇℃伅閲囬泦锛屽皢鍏堕噸瑕佺殑绯荤粺鎸囨爣寤虹珛鍩虹嚎锛岀劧鍚庡皢鍑洪棶棰樼殑鏃跺€欑殑绯荤粺鐘舵€佹暟鎹拰鍩虹嚎鐨勬暟鎹繘琛屾瘮杈冿紝浠庤€屽彂鐜伴棶棰樸€?span>DBA鍒嗘瀽AWR鎶ュ憡鐨勬椂鍊欙紝鏈€濂界殑鍔炴硶鏄姣斿钩鏃惰繖涓郴缁熻繖浜涙寚鏍囩殑骞冲潎鍊笺€佸悎鐞嗙殑楂樺€煎拰浣庡€艰繖浜涙寚鏍囷紝鑰屼笉鏄绔嬬殑浠庢煇涓€浠芥姤鍛婁腑鍘绘煡鎵鹃棶棰樸€?/span>

       鍙﹀涓€涓娉ㄦ剰鐨勯棶棰樻槸锛?span>AWR鎶ュ憡涓殑鎸囨爣涔嬮棿鏄浉浜掑叧鑱旂殑锛屽湪鍒嗘瀽杩欎簺鎸囨爣鐨勬椂鍊欙紝闇€瑕佺患鍚堝垎鏋愶紝灏嗚繖浜涙寚鏍囧拰鍏朵粬鐨勬暟鎹姣斿垎鏋愶紝鎵嶈兘澶熷緱鍒拌緝涓哄噯纭殑鍒嗘瀽缁撴灉锛屾瘮濡傝浣犱粠鏌愪簺鎸囨爣涓婄湅鍑哄彲鑳?span>DB CACHE瀛樺湪闂锛岄偅涔堜綘灏遍渶瑕佹瘮瀵规姤鍛婂ご涓殑DB CACHE鍛戒腑鐜囨儏鍐碉紝浠ュ強浜嬩欢鏄庣粏涓殑db file sequential read銆?span>db file scattered read绛夋寚鏍囦腑鐨勫钩鍧囩瓑寰呮椂闂达紝濡傛灉DB CACHE鐨勫懡涓巼杈冮珮锛屼絾鏄?span>db file sequential read鐨勫钩鍧囩瓑寰呮椂闂磋緝澶э紝閭ｄ箞涔熶笉鑳借DB CACHE灏变竴瀹氭病鏈夐棶棰橈紝鎴戜滑鍙互缁х画閫氳繃鍚庨潰鐨?span>Buffer Pool Statistics绛変俊鎭潵鍒嗘瀽BUFFER CACHE鏄笉鏄厤缃笉鍚堢悊锛屼互鍙婂浣曚紭鍖栥€?/span>

       闄勮〃鏄?span>AWR/STATSPACK鎶ュ憡涓殑涓昏鎸囨爣鐨勬弿杩帮紝璇ヨ〃鍙互浣滀负DBA鐨勪竴涓弬鑰冭祫鏂欐潵浣跨敤锛屾病蹇呰姣忎釜鎸囨爣閮藉幓璁ょ湡鐮旇锛屼篃涓嶅繀瑕佹妸杩欏紶琛ㄧ殑鍐呭鑳岃涓嬫潵銆傝繖寮犺〃涓殑鍐呭澶ч儴鍒嗘槸鑰佺櫧杩欎簺骞寸爺璇?span>STATSPACK鎶ュ憡浣撲細鍑烘潵鐨勶紝骞朵笉鏄潵鑷簬瀹樻柟鐨勮娉曪紝鍥犳鍙兘閮ㄥ垎鎻忚堪涔熶笉寰堝噯纭紝濡傛灉澶у瀵硅€佺櫧瀵硅繖浜涙寚鏍囩殑瑙ｉ噴鏈変粈涔堢枒闂紝娆㈣繋鍒?span>www.oraclefans.cn涓婂幓鍜岃€佺櫧鎺㈣銆?/span>

 

鍚嶇О	娉ㄩ噴
CPU used by this session	缁熻CALL鍙戣捣寮€濮嬪埌缁撴潫鐨?span>CPU鏃堕棿鐗囩殑鏁伴噺锛屾瘡涓鏁颁唬琛ㄤ竴涓?span>CPU鍛ㄦ湡锛屼篃灏辨槸10姣銆備笉杩囧鏋滄湁涓€涓?span>CALL涓嶈冻涓€涓?span>CPU鍛ㄦ湡灏辨墽琛屽畬浜嗭紝閭ｄ箞缁熻鍊肩殑鏃跺€?span>START TIME鍜?span>END TIME鏄浉鍚岀殑锛岃繖鏍蜂細璁＄畻涓?span>0.杩欎釜璁℃暟鍩烘湰涓婂彲浠ヤ唬琛ㄤ簡ORACLE鏁版嵁搴撴秷鑰楃殑CPU璧勬簮锛屼笉杩囪绠楃殑鏃跺€欒娉ㄦ剰鍗曚綅鏄帢绉?span>(cs)锛屼箻浠?span>10鍙互鎹㈢畻鎴愭绉掋€傛瘮濡傚钩鍧囨瘡绉掕繖涓寚鏍囧€兼槸782.1锛岃〃绀?span>ORACLE娑堣€椾簡7821姣CPU鏃堕棿锛屽鏋滆繖涓郴缁熸槸涓€涓?span>16涓?span>CPU鐨勭郴缁燂紝閭ｄ箞杩欎釜鎸囨爣鍙互璇存槑ORACLE娑堣€椾簡瓒呰繃50%鐨?span>CPU璧勬簮銆備笉杩囩敱浜庨儴鍒嗗皬鐨?span>CALL鍙兘鐢变簬娑堣€楃殑鏃堕棿灏忎簬10姣鑰屾病鏈夎绠楄繘鍘伙紝瀹為檯鐨勪娇鐢ㄧ巼鍙兘鐣ラ珮浜庨€氳繃杩欎釜鍊艰绠楀嚭鏉ョ殑銆備竴鑸潵璇村ぇ澶氭暟CALL娑堣€楃殑CPU閮戒細澶т簬10姣锛屾墍浠ヨ繖涓€艰繕鏄兘澶熷熀鏈弽鏄犲嚭ORACLE瀵?span>CPU璧勬簮鐨勫紑閿€
CR blocks created	CURRENT鍧楄鍏嬮殕鍚庣敤浜庡垱寤?span>CR锛?span>consistent read锛夊潡銆傝鍏嬮殕鐨勪富瑕佸師鍥犳槸BUFFER琚潪鍏煎鐨勬ā寮忓崰鐢?span>,濡傛灉鍗曚綅鏃堕棿鍐?span>CR BLOCKS CREATED鍊兼瘮杈冮珮锛岃鏄庢暟鎹簱涓鏌愪簺鏁版嵁鍧楃殑淇敼鍜岃闂瘮杈冮绻併€傚鏋滆繖浜涜闂泦涓湪鏌愪簺鐑潡涓婏紝閭ｄ箞鍙兘浼氬舰鎴愯緝涓轰弗閲嶇殑BUFFER BUSY WAITS锛屽湪RAC鐜涓紝鍙兘杩樹細瀵艰嚧鍏ㄥ眬鐑潡鍐茬獊锛屽鏋滆繖涓寚鏍囨瘮杈冮珮锛岄偅涔堝簲璇ュ叧娉?span>BUFFER BUSY WAITS浠ュ強CACHE BUFFER CHAINS闂╅攣绛?/span>
current blocks converted for CR	涓€涓?span>CURRENT鐨?span>BUFFER鍦ㄨ浣跨敤鍓嶇敓鎴愪簡CR
DBWR buffers scanned	褰撴煇浜涜Е鍙戞潯浠跺彂鐢熸椂锛?span>DBWR浼氬湪LRU閾剧殑鍐风寮€濮嬫壂鎻忚剰鍧楋紝缁勬垚DBWR BATCH锛岃繖涓寚鏍囩粺璁＄殑鏄?span>DBWR鍦?span>LRU涓婃壂鎻忕殑BUFFER鐨勬€绘暟锛屽寘鍚剰鍧楀拰骞插噣鐨勫潡锛岃繖涓寚鏍囬櫎浠?span>DBWR LRU SCANS杩欎釜鎸囨爣灏辨槸姣忔鎵弿鏌ユ壘鐨勬暟鎹潡鐨勬暟閲忋€?/span>
DBWR checkpoint buffers written	CHECKPOINTS鏃?span>dbwr鍐欏叆鐨勭殑鑴忓潡鏁伴噺锛屽鏋滃湪鍗曚綅鏃堕棿閲岃繖涓寚鏍囨瘮杈冮珮锛岃鏄庣郴缁熶腑鏁版嵁鍧楃殑鍙樻洿杈冧负棰戠箒
DBWR free buffers found	DBWR浠?span>LRU閾句腑鎵弿BUFFER鐨勬椂鍊欏彂鐜扮殑FREE鐨?span>BUFFER鐨勬暟閲忥紝闄や互DBWR  MAKE FREE REQUESTS灏辨槸骞冲潎姣忔DBWR鍦ㄦ敹鍒?span>DBWR MAKE FREE娑堟伅鐨勬椂鍊欐壂鎻?span>LRU閾炬壘鍒扮殑FREE BUFFER鐨勫钩鍧囨暟锛岃繖涓钩鍧囨暟涓€鑸細姣旇緝灏?/span>
DBWR make free requests	DBWR鏀跺埌鐨?span>MAKE FREE 娑堟伅鐨勬暟閲忥紝濡傛灉鏌愪釜鍓嶅彴杩涚▼鍦ㄦ煡鎵句竴涓┖闂茬殑BUFFER鐨勬椂鍊欐棤娉曟壘鍒扮殑鏃跺€欐垨鑰呭叾浠栦竴浜涜Е鍙戞潯浠讹紝浼氬悜DBWR鍙戝嚭MAKE FREE娑堟伅銆傚鏋滃湪鍗曚綅鏃堕棿鍐呰繖涓€艰緝楂橈紝璇存槑DB CACHE鍙兘瀛樺湪涓嶈冻鐨勭幇璞?/span>
DBWR summed scan depth	DBWR鎵弿LRU閾炬煡鎵捐剰鍧楃殑鏃跺€欙紝鏌ユ壘鐨?span>BUFFER鐨勬暟閲忥紝杩欎釜鏁拌秺澶ц鏄?span>LRU閾惧熬閮ㄧ殑璧冨潡鏁伴噺瓒婂皯銆備粠Oracle 8i寮€濮嬶紝鐢变簬LRU閾剧殑绠楁硶鍙戠敓浜嗗彉鍖栵紝鍥犳濡傛灉LRU閾惧熬閮ㄧ殑鐑潡姣旇緝澶氾紝涔熷彲鑳介€犳垚杩欎釜鎸囨爣杈冨ぇ
DBWR timeout	DBWR IDLE瓒呰繃涓€涓壒瀹氬€硷紝璇ユ寚鏍囧氨浼氬姞1銆傚鏋滆鍊艰緝楂橈紝璇存槑BUFFER CACHE涓殑鏁版嵁鍙樺寲杈冨皬锛岄渶瑕佸啓鍏ョ鐩樼殑鑴忓潡鏁伴噺鏋佸皯
DBWR transaction table writes	DBWR鍐欏叆鐨勫洖婊氭澶寸殑鏁伴噺锛岃繖涓寚鏍囨瘮杈冮珮璇存槑鏈夎緝澶氱儹鍧楁鍦ㄨ鍐欏叆锛岃€屽ぇ閲忕敤鎴疯繘绋嬪湪绛夊緟杩欎簺鍧楀啓鍏ュ畬鎴?/span>
DBWR undo block writes	DBWR鍐欏叆鍥炴粴娈电殑鏁版嵁鍧楁暟閲?/span>
DDL statements parallelized	DDL鎿嶄綔骞跺彂鎵ц鐨勮鏁?/span>
DML statements parallelized	DML鎿嶄綔骞跺彂鎵ц鐨勮鏁?/span>
background checkpoints completed	鍚庡彴杩涚▼瀹屾垚鐨?span>CHECKPOINTS鐨勬暟閲忋€?/span>
background checkpoints started	鍚庡彴杩涚▼鍚姩鐨?span>CHECKPOINTS鏁伴噺锛屽彲鑳芥瘮涓婁竴涓姸鎬佺殑鍊煎ぇ涓€浜涖€傚鏋滀竴涓柊鐨?span>CHECKPOINT瑕嗙洊浜嗕竴涓湭瀹屾垚鐨?span>CHECKPOINT鎴栬€?span>CHECKPOINT杩樻鍦ㄦ墽琛屻€傝繖涓姸鎬佸彧鍖呭惈REDO鐨?span>CHECKPOINT锛屼笉鍖呮嫭鍏朵粬绫诲瀷鐨?span>CHECKPOINT锛屾瘮濡?span>OFFLINE鏂囦欢鎴栬€?span>BEGIN BACKUP鎴栬€?span>ALTER SYSTEM CHECKPOINT LOCAL鍛戒护绛?/span>
branch node splits	鐢变簬鎻掑叆鏁版嵁瀵艰嚧鐨勭储寮曟灊鑺傜偣鍒嗚鐨勬暟閲忥紝杩欎釜鎸囨爣杈冮珮璇存槑鐩墠瀛樺湪绱㈠紩浜х敓浜嗚緝澶氱殑鏋濊妭鐐瑰垎瑁傦紝鍙兘鏌愬紶琛ㄤ笂鐨勬煇涓储寮曞瓧娈靛彉鍖栧崄鍒嗛绻侊紝杩欑棰戠箒鐨勫彉鍖栧彲鑳藉鏌愪釜搴旂敤鐨勬€ц兘鏈夎緝澶х殑褰卞搷
BUFFER DEADLOCK	DB CACHE姝婚攣鐨勬暟閲忚鏁帮紝濡傛灉鍗曚綅鏃堕棿鍐呰鎸囨爣杈冮珮锛屽彲鑳?span>DB CACHE瀛樺湪鎬ц兘闂锛屾垨鑰呭瓨鍦ㄦ煇浜?span>BUG
buffer is not pinned count	褰撹闂竴涓?span>BUFFER鐨勬椂鍊欙紝杩欎釜BUFFER宸茬粡閲婃斁鐨勬暟閲忥紝鍙敤浜?span>Oracle鍐呴儴璋冭瘯锛屽苟涓嶈鏄庢€ц兘闂
buffer is pinned count	褰撹闂竴涓?span>BUFFER鐨勬椂鍊欙紝璇?span>BUFFER宸茬粡琚?span>PIN浣忎簡锛屽鏋滃崟浣嶆椂闂村唴杩欎釜鎸囨爣姣旇緝楂橈紝璇存槑鍙兘瀛樺湪鐑潡
change write time	褰撳墠鍧楃殑鍙樺寲琚啓鍏?span>REDO鐨勬椂闂达紝鍗曚綅鍘樼锛?span>cs,10姣锛夛紝璇ユ寚鏍囦竴鑸笉浼氬お澶э紝濡傛灉澶ぇ闇€瑕佸垎鏋?/span>
commit cleanout failures: block lost	鍦?span>commit鐨勬椂鍊欏噯澶囧仛鍧楁竻鐞嗘搷浣滅殑鏃跺€欙紝鍙戠幇涓嶈兘鎵惧埌姝ｇ‘鐨勫潡鐨勬鏁拌鏁般€?/span>
commit cleanout failures: buffer being written	Oracle鍦?span>COMMIT鐨勬椂鍊欙紝鍘绘竻闄?span>BUFFER鐨勬椂鍊欙紝鍙戠幇杩欎釜BUFFER 姝ｅ湪琚叾浠栦細璇濆啓鍏ョ殑璁℃暟锛屽鏋滄敼鎸囨爣姣旇緝楂橈紝鍙兘璇存槑瀛樺湪鐑潡
commit cleanout failures: callback failure	Oracle鍦?span>COMMIT鐨勬椂鍊欙紝鍋氭竻闄ゆ搷浣滄椂璋冪敤CALLBACK鍑芥暟杩斿洖FALSE鐨勮鏁?/span>
commit cleanout failures: cannot pin	Oracle鍦?span>COMMIT鐨勬椂鍊欙紝鍋氭竻闄ゆ搷浣滄椂鏃犳硶PIN鍒拌繖涓?span>BUFFER鐨勮鏁?span>,鏈夊彲鑳藉湪鍑嗗娓呯悊鐨勬椂鍊欒BUFFER鍙堣鍏朵粬浼氳瘽PIN浣忎簡锛屽鏋滆鎸囨爣杈冮珮锛屽彲浠ユ煡鐪?span>DB CACHE鐩稿叧鐨勬儏鍐碉紝鍖呮嫭DB CACHE鐨勫ぇ灏忥紝鍛戒腑鐜囷紝鐩稿叧闂╅攣鐨勫懡涓巼锛屼互鍙婄儹鍧椾簤鐢ㄧ殑鎯呭喌
commit cleanout failures: hot backup in progress	Oracle鍦?span>COMMIT鐨勬椂鍊欙紝鍋氭竻闄ゆ搷浣滄椂鍙戠幇姝ｅ湪鍋氱儹澶囦唤鐨勬妧鏈€傛鏃跺湪淇敼杩欎釜BUFFER鍓嶏紝杩欎釜BUFFER鍦ㄨ淇敼鍓嶏紝蹇呴』鍏堣鍐欏叆LOG BUFFER锛屼互纭繚鏁版嵁搴撴仮澶嶇殑鏃跺€欎笉浼氫骇鐢熷潡鏂
commit cleanout failures: write disabled	Oracle鍦?span>COMMIT鐨勬椂鍊欙紝鍋氭竻闄ゆ搷浣滄椂鍙戠幇鏁版嵁搴撶殑鍐欐搷浣滄殏鏃惰鍏抽棴浜嗐€傝繖绉嶆儏鍐靛嚭鐜扮殑寰堝皯
commit cleanouts	鍦ㄥ仛COMMIT鐨勬椂鍊欏仛鍧楁竻闄ゅ伐浣滅殑璁℃暟锛屾棤璁烘垚鍔熶笌鍚﹁鏁板櫒閮戒細鍔?span>1
commit cleanouts successfully completed	COMMIT鏃舵垚鍔熷畬鎴?span>CLEANOUTS鐨勮鏁般€傝繖涓寚鏍囧拰涓婁竴涓寚鏍囧弬鑰冩潵鐪嬶紝涓や釜鎸囨爣搴旇杈冧负鎺ヨ繎锛堣繖涓寚鏍囩暐浣庝竴浜涳級锛屽鏋滆繖涓や釜鎸囨爣鐩稿樊澶ぇ锛岄渶瑕佸垎鏋?span>DB CACHE鏄惁瀛樺湪杩囧皬鐨勯棶棰橈紝鎴栬€呭簲鐢ㄤ腑鏄惁缁忓父瀵瑰ぇ琛ㄨ繘琛屽ぇ鏁版嵁閲忕殑淇敼鎿嶄綔
consistent changes	鏁版嵁鍧楁彁浜や簡UNDO淇℃伅鎴愪负CR鍧楃殑璁℃暟锛岃繖涓寚鏍囪鏄庝簡绯荤粺涓?span>CR鍧椾骇鐢熺殑鏁伴噺锛岃繖涓寚鏍囪秺澶э紝瓒婅娉ㄦ剰CACHE BUFFER CHAINS绛夐棭閿佺殑鎯呭喌锛屼互鍙婄儹鍧楀绯荤粺鎬ц兘鐨勫奖鍝?/span>
consistent gets	涓€鑷存€ц鐨勮鏁帮紝浼氳瘽鍙戝嚭鐨勫鏌愪釜鏁版嵁鍧楄繘琛屼竴鑷存€ц鐨勮姹傘€傝繖涓寚鏍囦笉鑳藉拰consistent changes娣锋穯锛屼竴涓?span>CR鍧椾骇鐢熷悗锛屽彲鑳借澶氭consistent gets浣跨敤锛屽洜姝よ繖涓寚鏍囪姣斿墠涓€涓寚鏍囧ぇ鐨勫銆?/span>
data blocks consistent reads - undo records applied	浠?span>UNDO涓鍙栨暟鎹紝褰㈡垚CR READ銆傛湰璁℃暟鍣ㄦ槸璁板綍浠?span>UNDO涓幏鍙?span>UNDO璁板綍鐨勮鏁帮紝濡傛灉杩欎釜鎸囨爣鐨勫€艰緝澶э紝璇存槑瀵逛簬鏌愪簺淇敼杈冧负棰戠箒鐨勮〃鐨勬煡璇㈠拰鍏朵粬鎿嶄綔涔熷緢棰戠箒锛屾湁鍙兘瀛樺湪鐑偣琛ㄥ拰绱㈠紩
deferred (CURRENT) block cleanout applications	鍋氬欢杩熷潡娓呴櫎鎿嶄綔鐨勮鏁般€傚湪鎻愪氦鐨勬椂鍊欒鏁版嵁鍧楃敱浜庢煇浜涘師鍥狅紝鏌愪簺鏁版嵁鍧楁棤娉曢┈涓婂仛鍧楁竻闄ゅ伐浣滐紝杩欑鎯呭喌涓嬶紝杩欎釜鏁版嵁鍧楀氨浼氬仛寤惰繜鍧楁竻闄わ紝寤惰繜鍧楁竻闄ゆ搷浣滃彲鑳藉湪涓嬫璇ユ暟鎹潡琚煡璇㈢殑鏃跺€欒繘琛岋紝杩欑鎯呭喌涔熷鑷翠簡鏈夋椂鍊欐垜浠細鐪嬪埌鎴戜滑鍋?span>SELECT鎿嶄綔鐨勬椂鍊欎篃浼氫骇鐢熷ぇ閲忕殑REDO
dirty buffers inspected	褰撴煇涓細璇濆湪LRU閾剧殑鍐风寮€濮嬫煡鎵剧┖闂茬殑鏁版嵁鍧楋紝鏌ュ埌涓€涓剰鍧楋紝杩欎釜鎸囨爣灏变細琚鍔狅紝濡傛灉鍦ㄥ崟浣嶆椂闂村唴璇ユ寚鏍囪緝澶э紝璇存槑LRU閾剧殑鍐风瀛樺湪杈冨鐨勮剰鍧椼€傝繖绉嶆儏鍐电殑鍑虹幇鏈夊嚑绉嶅彲鑳斤細    l          绯荤粺涓殑璧冨潡鏁伴噺鍗佸垎宸ㄥぇ锛岃€屼笖DBWR鐨勫啓鍏ラ€熷害涓嶈冻锛屼粠鑰屽鑷?span>DBWR鏃犳硶灏藉揩灏嗚繖浜涜剰鍧楀啓鍏ョ‖鐩?/span>    l          閮ㄥ垎BUFFER 鐗瑰埆鐑紝骞朵笖琚洿鏀圭殑棰戠巼鐗瑰埆楂橈紝浠庤€岄€犳垚LRU閾剧殑灏剧瀛樺湪澶ч噺杩欐牱鐨勫潡    l          鏈郴缁熸槸涓€涓互DML涓轰富鐨勭郴缁燂紝鏁版嵁鍧楃殑鍙樻洿鍗佸垎棰戠箒    纰板埌杩欑鎯呭喌锛屽彲浠ュ叧娉ㄤ竴涓?span>dbwr鐨勬€ц兘锛屽苟涓斿叧娉ㄤ竴涓?span>DB  CACHE鐨勫懡涓巼鍙?span>cache buffer chains绛夐棭閿佺殑鎯呭喌
enqueue waits	绛夊緟鍚勭閿佺殑璁℃暟
exchange deadlocks	褰撹繘琛屼袱涓?span>BUFFER浜ゆ崲鐨勬椂鍊欙紝鍙戠敓鍐呴儴姝婚攣鐨勮鏁般€傜储寮曟壂鎻忔槸瀵艰嚧杩欑浜ゆ崲鐨勫敮涓€鍥犵礌锛屽鏋滄敼鎸囨爣杈冮珮锛屽彲浠ユ鏌ユ槸鍚﹀瓨鍦ㄥ崄鍒嗙儹鐨勭储寮曪紙鍙互閫氳繃BUFFER BUSY WAITS鍒嗘瀽鏉ュ畾浣嶏級
free buffer inspected	浠?span>LRU闃熷垪鐨勫熬閮ㄦ壂鎻忓彲閲嶇敤鐨?span>BUFFER鐨勬椂鍊欒烦杩囩殑BUFFER鐨勬暟閲忋€?/span>
global cache freelist waits	褰?span>ping涓€涓?span>buffer鐨勬椂鍊欑敱浜庢墍鏈夌殑lock element閮借浣跨敤鑰屽紩璧风殑绛夊緟銆?/span>
global lock convert time	鍚屾鍏ㄥ眬閿佺殑杞崲鏃堕棿锛堝崟浣嶆槸10ms锛夛紝杩欎釜鎸囨爣杈冮珮璇存槑鍏ㄥ眬閿佸啿绐佽緝涓轰弗閲嶏紝闇€瑕佹鏌?span>cluster interconnect鐨勬€ц兘
hot buffers moved to head of LRU	褰撲竴涓儹鍧楀埌杈?span>LRU闃熷垪鐨勫熬閮ㄧ殑鏃跺€欙紝ORACLE鑷姩浼氭妸杩欎釜鍧楃Щ鍔ㄥ埌LRU闃熷垪鐨勫ご涓婏紝浠ヤ究浜庝娇涔嬭兘澶熺户缁浣跨敤銆傛瘡鍙戠敓涓€娆¤繖鏍风殑鎿嶄綔锛岃繖涓鏁板氨鍔犱竴锛屽€煎緱娉ㄦ剰鐨勬槸锛屼粠8i寮€濮嬶紝LRU鐨勭畻娉曞彂鐢熶簡鍙樺寲锛岄€氳繃寮曞叆TCH璁℃暟鏉ョ‘瀹氱儹鍧楋紝鑰屼笉鏄€氳繃灏嗙儹鍧楀湪LRU閾句笂绉诲姩鏉ヤ繚璇佺儹鍧椾笉琚繃鏃╃殑鎹㈠嚭銆傚鏋滅儹鍧楀瓨鍦ㄤ簬LRU閾剧殑灏鹃儴锛屾壂鎻忕殑鏃跺€欏彂鐜颁簡鐑潡锛屼細涓诲姩璺宠繃锛屼粠鑰屼繚璇佺儹鍧椾笉琚繃鏃╃殑閲嶇敤
immediate (CURRENT) block cleanout applications	鑾峰彇BUFFER锛?span>GET BUFFER锛夊悗锛岀珛鍗宠繘琛岃褰曟竻闄ゆ搷浣滅殑璁℃暟銆?/span>
leaf node splits	褰?span>INSERT鍙戠敓鍚庯紝瀵艰嚧绱㈠紩鍙惰妭鐐瑰垎瑁傜殑娆℃暟锛屼竴鑸潵璇村浜庢彃鍏ヨ緝涓洪绻佺殑绯荤粺锛岃繖涓寚鏍囦竴鑸細姣旇緝楂橈紝闄ら潪鍑虹幇鍙惰妭鐐圭儹鍧楄緝涓轰弗閲嶇殑鐜拌薄锛屼竴鑸潵鎵€涓嶉渶瑕佺壒鍒叧娉ㄨ鎸囨爣
logons current	褰撳墠鐧诲綍鏁版嵁搴撶殑璁℃暟
opened cursors current	褰撳墠鐨?span>Open CURSORS鐨勬暟閲?/span>
opens of replaced files	鏂囦欢鐢变簬涓嶅湪鎵撳紑鏂囦欢缂撳啿涓€岄噸鏂版墦寮€鐨勮鏁般€傛瘡涓?span>Oracle浼氳瘽閮芥湁涓€涓枃浠舵墦寮€缂撳啿鍖猴紝淇濇寔閮ㄥ垎鎵撳紑鐨勬暟鎹枃浠剁殑鍙ユ焺锛屼互閬垮厤閲嶅鎵撳紑鏂囦欢
parse count (hard)	纭垎鏋愮殑缁熻鍊硷紝璇ュ€奸渶瑕佸拰parse count (total)瀵规瘮鏉ョ湅纭垎鏋愮殑姣斾緥銆?/span>
parse count (soft)	杞垎鏋愮殑缁熻鍊?/span>
parse count (total)	鍙戠敓鐨?span>parse call鐨勬€绘暟
parse time cpu	PARSE娑堣€楃殑CPU鐨勭粺璁★紝鍗曚綅鏄?span>10姣
parse time elapsed	PASE鐨勬寔缁椂闂达紝鍗曚綅鏄?span>10姣銆傝繖涓寚鏍囧噺鍘?span>parse time cpu灏辨槸parse涓瓑寰呯殑鏃堕棿銆傚鏋?span>parse time cpu鍗犳暣涓?span>parse time elapsed鐨勬瘮渚嬭緝浣庯紝璇存槑parse涓殑绛夊緟鏃堕棿杩囬暱锛屽彲鑳藉叡浜睜瀛樺湪鎬ц兘闂锛岄渶瑕佽繘琛屽垎鏋?/span>
physical reads direct	鐩存帴鐗╃悊璇荤殑鏁伴噺銆傝鐨勬椂鍊欎笉缁忚繃BUFFER銆備竴鑸彂鐢熻繖绉嶆搷浣滅殑鎯呭喌鏈夛細鎺掑簭鎿嶄綔銆佸苟琛屾煡璇㈡搷浣滅殑SLAVE鎴栬€呴璇?/span>
physical writes direct	鐩存帴鍐欑殑鏁伴噺锛屼笉缁忚繃BUFFER锛岀洿鎺ュ啓鍏ャ€備竴鑸彂鐢熻繖绉嶆搷浣滅殑鎯呭喌鏈夛細    l          鐩存帴瑁呰浇鎿嶄綔锛屾瘮濡?span>CREATE TABLE AS SELECT    l          骞惰DML鎿嶄綔    l          鎺掑簭鎿嶄綔涓殑涓存椂琛ㄧ┖闂村啓鍏?/span>    l          鍐欏叆娌℃湁缂撳啿鐨?span>LOB瀛楁
physical writes non checkpoint	闈?span>CHECKPOINT寮曡捣鐨勭墿鐞嗗啓銆傜墿鐞嗗啓鐨勫彂鐢熸儏鍐靛寘鎷?span>CHECKPOINT鎴栬€呮棤瓒冲鐨勭┖闂?span>BUFFER鍙敤锛屾垨鑰?span>DBWR瓒呮椂绛夛紝涓€鑸儏鍐典笅杩欎釜鎸囨爣浼氳秴杩?span>physical writes鐨勪竴鍗婁互涓婏紝闄ら潪鏄?span>CHECKPOINT鍗佸垎棰戠箒鐨勭郴缁熴€傚鏋滆鎸囨爣鍗?span>physical writes鐨勬瘮閲嶆瘮杈冨皯锛屽簲璇ヨ繘琛屽垎鏋?/span>
pinned buffers inspected	褰撲竴涓敤鎴疯繘绋嬫壂鎻?span>REPLACEMENT鍒楄〃锛屽鎵句竴涓彲閲嶇敤鐨?span>BUFFER鐨勬椂鍊欙紝鍙戠幇涓€涓喎鍧楄PIN浜嗘垨鑰呮湁涓€涓?span>PIN璇锋眰鐨勭瓑寰呬簨浠躲€傝繖绉嶆儏鍐靛緢灏戝彂鐢燂紝鍥犱负鍐峰潡寰堝皯浼氳PIN銆傚鏋滃钩鍧囨瘡绉掕鎸囨爣鍊艰緝澶э紝闇€瑕佽繘琛屽垎鏋?/span>
queries parallelized	骞惰鏌ヨ鎵ц鐨勬鏁扮粺璁?/span>
recursive cpu usage	闈炵敤鎴疯皟鐢ㄧ殑CUP鏃堕棿
recovery array read time	鍋?span>recovery鐨勬椂鍊欎骇鐢熺殑IO娑堣€楃殑鏃堕棿
recovery array reads	鍋?span>RECOVERY鐨勬椂鍊欎骇鐢熺殑IO鐨勬鏁?/span>
recovery blocks read	鍋?span>recovery鐨勬椂鍊欒鍙栫殑鏁版嵁鍧楃殑鏁伴噺
redo entries	褰撲竴涓?span>redo淇℃伅琚嫹璐濆埌log buffer鐨勬椂鍊欒繖涓鏁板鍔?/span>
redo entries linearized	灏忎簬绛変簬REDO_ENTRY_PREBUILD_THRESHOLD鐨?span>redo entries鐨勬暟閲忥紝杩欎簺redo entries鍙互骞跺彂鐢熸垚锛屼笉闇€瑕佸彈闂╅攣鐨勯檺鍒讹紝浣嗘槸浼氬鍔?span>CPU鐨勬秷鑰楋紝鍦ㄥCPU鐨勭郴缁熶腑锛岃繖涓€间細姣旇緝楂?/span>
redo buffer allocation retries	褰撶敵璇?span>REDO BUFFER鐨勬椂鍊欙紝閲嶈瘯鐨勬鏁般€備竴鑸潵璇撮噸璇曞彂鐢熺殑鍘熷洜鏄?span>REDO WRITER杩樻病瀹屾垚鎴栬€呮棩蹇楀垏鎹㈡鍦ㄨ繘琛屻€傚鏋滆鎸囨爣杈冮珮锛岃鏄?span>REDO  LOG浜х敓鐨勯鐜囧緢楂橈紝LGWR鏃犳硶鍙婃椂鍒锋柊LOG  BUFFER锛屽彲浠ヨ€冭檻鍔犲ぇLOG BUFFER鐨勫ぇ灏忋€?span>LOG  BUFFER涓€鑸彲浠ヤ负鍑犲厗鍒板嚑鍗佸厗锛屼笉杩囩敱浜庡緢澶氭暟鎹簱鐗堟湰涓瓨鍦?span>BUG锛屽洜姝や笉寤鸿灏?span>LOG BUFFER璁剧疆鐨勮繃澶э紝涓€鑸潵璇?span>30-40M瀵逛簬缁濆ぇ澶氭暟绯荤粺鏉ヨ閮芥槸瓒冲鐨勪簡    濡傛灉鏄敱浜庣瓑寰呮棩蹇楀垏鎹紝閭ｄ箞鍙兘鏄瓨鍦ㄧ殑闂鍖呮嫭锛?/span>    l          REDO  LOG鏂囦欢杩囧皬    l          REDO  LOG IO鎬ц兘涓嶄匠    l          鏁版嵁鏂囦欢鐨?span>IO鎬ц兘涓嶄匠瀵艰嚧DBWR鍐欏叆杈冩參    l          DBWR鐨勬暟閲忓お灏戯紝瀵艰嚧DBWR鐨勫啓鍏ユ€ц兘涓嶈冻
redo log space requests	褰撳墠ACTIVE鐨勬棩蹇楁枃浠舵弧浜嗭紝Oracle蹇呴』绛夊緟鏃ュ織鍒囨崲瀹屾垚鍚庢墠鑳藉垎閰?span>REDO LOG纾佺洏绌洪棿锛屽氨浼氫骇鐢熻繖涓瓑寰呫€傚鏋?span>SGA鐨勫ぇ灏忓拰鏃ュ織鏂囦欢鐨勫ぇ灏忎笉鍖归厤锛屽苟涓旂郴缁熶腑鐨?span>COMMIT鍗佸垎棰戠箒銆傚綋鏃ュ織鍒囨崲鐨勬椂锛?span>DBWR闇€瑕佹妸宸茬粡鎻愪氦鐨勮剰鍧椾篃鍐欏叆纾佺洏锛屽湪杩欎簺鑴忓潡鍐欏叆纾佺洏瀹屾垚鍓嶏紝鏃ュ織鍒囨崲涓嶈兘瀹屾垚銆傚湪杩欑鎯呭喌涓嬶紝杩欎釜缁熻鍊间細姣旇緝楂樸€?/span>    濡傛灉杩欎釜缁熻鍊艰緝楂橈紝寤鸿妫€鏌ヤ互涓嬪嚑涓柟闈細    l          REDO  LOG鏂囦欢鐨?span>IO鎬ц兘鏄惁瀛樺湪闂锛屽鏋?span>log file parallel write鐨勫钩鍧囪€楁椂杈冨ぇ锛岃鏄?span>REDO LOG鐨勫啓鎬ц兘鍑虹幇浜嗛棶棰橈紝寤鸿灏?span>REDO LOG鏀惧埌鎬ц兘鏇村ソ鐨勭鐩樹笂锛屾垨鑰呭皢REDO LOG鏂囦欢鐙珛瀛樻斁锛岄伩鍏?span>IO鍐茬獊    l          LOG  BUFFER鐨勫ぇ灏忔槸鍚﹁繃灏?/span>    l          搴旂敤杞欢涓殑鎻愪氦鍙兘杩囦簬棰戠箒锛屽缓璁噰鐢ㄦ壒閲忔彁浜ょ殑鏂瑰紡锛岃€屼笉瑕佹瘡鏉¤褰曢兘鎻愪氦
redo log space wait time	Redo log space requests鐨勭瓑寰呮椂闂达紙鍗曚綅鍘樼锛夛紝杩欎釜鎸囨爣闇€瑕佸拰涓婁竴涓寚鏍囦竴璧风湅
redo size	鐢熸垚鐨勬墍鏈?span>redo鐨勫ぇ灏忥紝鍗曚綅鏄瓧鑺?/span>
redo synch time	Redo synch璋冪敤娑堣€楃殑鏃堕棿锛屽崟浣嶆槸10姣锛堝帢绉掞級
redo sync writes	涓€鑸潵璇?span>redo淇℃伅鐢熸垚鍚庯紝浼氳鎷疯礉鍒?span>log buffer涓紝骞朵笉闇€瑕侀┈涓婅鍐欏叆redo log鏂囦欢锛?span>lgwr浼氬懆鏈熸€у皢杩欎簺鏁版嵁鍐欏叆redo log鏂囦欢銆備笉杩囧鏋滀簨鍔℃彁浜や簡锛岄偅涔堣繖浜?span>redo 淇℃伅蹇呴』椹笂琚啓鍏?span>REDO LOG鏂囦欢锛岃繖涓椂渚?span>redo sync writes璁℃暟鍣ㄤ細澧炲姞
redo wastage	鍦ㄦ妸LOG BUFFER鏁版嵁鍐欏叆REDO LOG鏂囦欢鐨勬椂鍊欒绠楃殑LOG BUFFER绌洪棽鐨勭┖闂?/span>
redo writer latching time	LGWR鑾峰緱姣忎釜COPY LATCH鐨勬椂闂达紙鍗曚綅鍘樼锛夛紝濡傛灉璇ユ寚鏍囧瓨鍦ㄩ棶棰橈紝闇€瑕佹鏌?span>REDO LOG鏂囦欢鐨?span>IO鎬ц兘浠ュ強LOG BUFFER鐨勫ぇ灏忔槸鍚﹁冻澶燂紝杩欎釜鎸囨爣鍙湁鍦?span>LOG_SIMULTANEOUS_COPIES > 0鐨勬椂鍊欐墠鏈夋剰涔?/span>
redo writes	LGWR灏?span>LOG BUFFER鍐欏叆REDO LOG鏂囦欢鐨勮鏁?/span>
remote instance undo block writes	濡傛灉杩滅▼鐨勫疄渚嬮渶瑕佽鍙栨煇涓?span>UNDO BLOCK锛岄渶瑕佽繖涓疄渚嬪厛灏嗚繖涓?span>“鑴忕殑”UNDO BLOCK鍥炲啓锛岃繖涓鏁板櫒灏变細澧炲姞
remote instance undo header writes	鍜屼笂涓€涓寚鏍囩被浼硷紝鍙槸鍐欏叆鐨勬槸UNDO HEADER
remote instance undo requests	鐢变簬瑕佸仛CR浠庤繙绋嬬殑瀹炰緥涓姹?span>UNDO鐨勬暟閲忥紝濡傛灉杩欎釜鎸囨爣杈冨ぇ锛岃鏄?span>RAC涓殑鏌愪簺鏁版嵁鍧楃粡甯稿湪瀹炰緥闂磋繘琛屽叡浜紝鏌愪釜瀹炰緥淇敼杩囩殑鏁版嵁涔熸鍦ㄨ鍏朵粬瀹炰緥浣跨敤锛岃繖绉嶆儏鍐典笅闇€瑕佺暀鎰?span>CLUSTER INTERCONNECT鐨勬€ц兘
rollback changes - undo records applied	褰撶敤鎴烽渶瑕?span>ROLLBACK鐨勬椂鍊欙紝鎻愪氦鐨?span>UNDO璁板綍鐨勬暟閲忥紝褰撲簨鍔￠渶瑕佸洖婊氭椂锛岄渶瑕佷粠UNDO涓彇鍑烘暟鎹紝骞朵笖鎻愪氦鍒板凡琚慨鏀硅繃鐨勬暟鎹笂锛岃繖涓鏁板拰绯荤粺涓?span>ROLLBACK鐨勬暟閲忎互鍙婃瘡娆?span>ROLLBACK鐨勮褰曠殑鏁伴噺鏈夊叧
rollbacks only - consistent read gets	褰撶敤鎴烽渶瑕佽繘琛?span>CR READ鐨勬椂鍊欙紝鎻愪氦鐨?span>UNDO璁板綍鐨勬暟閲忥紝姝ゆ椂骞舵病鏈?span>BUFFER CLEAR鎿嶄綔鍙戠敓銆傚綋杩涜涓€鑷存€ц鐨勬椂鍊欙紝涔熼渶瑕佷粠UNDO涓彇鍑虹浉鍏崇殑鏁版嵁锛岀劧鍚庣敓鎴愪竴涓?span>CR BLOCK锛屾妸杩欎簺鏁版嵁鎻愪氦鍒?span>CR BLOCK涓婏紝杩欎釜鏃跺€欒繖涓寚鏍囧氨浼氬鍔犮€?/span>
rows fetched via callback	CALLBACK鍑芥暟杩斿洖鐨勮褰曟暟銆傝缁熻閲忎粎浠呯敤浜庡唴閮?span>DEBUG
session cursor cache count	浼氳瘽CURSOR缂撳啿鍖虹殑璁℃暟锛屽彧鏈夊綋session_cached_cursors澶т簬0鐨勬椂鍊欐墠鏈夋剰涔夛紝濡傛灉杩欎釜鍊煎凡缁忓緢鎺ヨ繎鐢氳嚦鍒拌揪浜嗗弬鏁颁腑session_cached_cursors鐨勫€硷紝閭ｄ箞璇存槑杩欎釜鍙傛暟鍙兘闇€瑕佸姞澶?/span>
session cursor cache hits	杩欎釜鎸囨爣涔熷彧鏈夊綋session_cached_cursors澶т簬0鎵嶆湁鎰忎箟锛屼細璇濈洿鎺ヤ粠SESSION CURSOR CACHE涓壘鍒版煇涓?span>SQL鐨勮鏁帮紝杩欎釜鍊煎彲浠ョ湅鍑?span>CURSOR CACHE浜х敓鐨勪綔鐢紝鍙互灏嗚繖涓€煎拰parse  count(total)杩涜姣旇緝
sorts (disk)	纾佺洏鎺掑簭鐨勬暟閲忥紝濡傛灉骞冲潎姣忕璇ユ寚鏍囩殑鍊艰緝楂橈紝闇€瑕佹鏌ヤ竴涓?span>PGA_AGGREGATE_TARGET鍙傛暟鏄惁璁剧疆杩囦綆锛屾垨鑰?span>*_AREA_SIZE鏄惁璁剧疆杩囧皬锛?span>PGA鎵嬪伐绠＄悊妯″紡锛夈€傛鏌ヨ鎸囨爣鐨勬椂鍊欙紝鍚屾椂搴旇鏌ョ湅涓€涓?span>TEMP琛ㄧ┖闂寸殑鐩稿叧鏂囦欢鐨?span>IO鎬ц兘锛屽鏋?span>TEMP琛ㄧ┖闂存枃浠剁殑IO鎬ц兘涓嶈冻锛岄渶瑕佸姞澶?span>PGA鐨勯厤缃潵鍑忓皯纭洏鎺掑簭
sorts (memory)	鍐呭瓨鎺掑簭鐨勭粺璁?/span>
summed dirty queue length	姣忔鍐欒姹傚彂鐢熺殑鏃跺€欙紝鑴忔暟鎹潡閾捐〃鐨勯暱搴︽€诲拰闄や互鍐欒姹傜殑娆℃暟锛岃繖涓粺璁″€艰秺澶э紝璇存槑绯荤粺涓渶瑕佸洖鍐欑殑鑴忓潡杈冨
switch current to new buffer	灏嗗綋鍓?span>BUFFER绉诲姩鍒板彟澶栦竴涓柊鐨?span>BUFFER锛屽師鏈夌殑BUFFER鎴愪负涓€涓?span>CR BLOCK锛岃繖绉嶆搷浣滅殑娆℃暟
table fetch by rowid	閫氳繃ROWID璁块棶琛紝杩欑鎿嶄綔涓€鑸槸閫氳繃绱㈠紩璁块棶锛岃繕鏈変竴绉嶆儏鍐垫槸SQL鐩存帴閫氳繃rowid鍘昏闂煇涓〃銆?/span>
table fetch continued row	濡傛灉璁块棶鏌愪竴琛屾暟鎹紝闇€瑕佽闂涓?span>BLOCK锛岃繖涓鏁板櫒灏变細澧炲姞銆備骇鐢熻繖绉嶆儏鍐电殑涓€涓緢涓昏鐨勫師鍥犳槸琛岄摼鍜岃杩佺Щ锛屽鏋滄煇涓〃鐨?span>PCT_FREE璁剧疆涓嶅悎鐞嗭紝鍙兘瀵艰嚧UPDATE鐨勬椂鍊欎骇鐢熻杩佺Щ锛岃繖鏍峰氨浼氬鍔犺繖涓鏁?/span>    绗簩绉嶅彲鑳芥€ф槸鏌愪竴琛岃鏁扮殑闀垮害鐩稿BLOCK SIZE鏉ヨ杩囧ぇ锛岃繖鏍蜂竴琛屾暟鎹瀛樺偍鍦ㄥ涓?span>BLOCK涓殑鏈轰細灏辫緝澶э紝杩欑鎯呭喌涓嬪簲璇ュ皢杩欑琛ㄥ瓨鏀句簬鏇村ぇ鐨?span>BLOCK SIZE鐨勮〃绌洪棿涓?/span>    杩樻湁涓€绉嶅彲鑳芥€у氨鏄郴缁熶腑璁块棶甯?span>LOB瀛楁鐨勮闂緝澶氾紝鍥犱负澶х殑LOB瀛楁涓€鑸潵璇撮噰鐢ㄧ嫭绔嬬殑SEGMENT瀛樻斁锛屽洜姝よ闂繖绉嶆暟鎹篃浼氬鍔犺繖涓粺璁″€?/span>
total file opens	琚?span>INSTANCE鎵撳紑鐨勬枃浠剁殑鏁伴噺锛堝寘鍚暟鎹枃浠躲€佹帶鍒舵枃浠躲€?span>REDO  LOG绛夛級
transaction rollbacks	琚垚鍔熷洖閫€鐨勪簨鍔＄殑鎬绘暟
write clones created in background	濡傛灉褰撳墠鐨?span>BUFFER姝ｅ湪琚啓鍏ワ紝閭ｄ箞鍚庡彴杩涚▼鎴栬€呭墠鍙拌繘绋嬪厠闅嗕竴涓柊鐨?span>BUFFER锛屼娇鍘熸潵BUFFER鐨勫啓鍏ュ彲浠ョ户缁繘琛?/span>
enqueue conversions	琛ㄦ垨鑰呰閿佺殑杞崲缁熻
enqueue deadlocks	姝婚攣缁熻
enqueue releases	閿侀噴鏀剧粺璁?/span>
enqueue requests	閿佺敵璇风粺璁?/span>
enqueue timeouts	閿佺敵璇疯秴鏃剁粺璁?/span>
enqueue waits	閿佺瓑寰呯粺璁?/span>