有人問這樣的sql該怎么實(shí)現(xiàn)：
表數(shù)據(jù)和結(jié)構(gòu)
?? ?CODE?NAME????B01????S01????B02????S02
????1??????????張三???????數(shù)學(xué)????80??
????1??????????張三????????????????????????????語(yǔ)文????75
????2??????????王五???????數(shù)學(xué)????70??
????2??????????王五????
????3??????????李四???????數(shù)學(xué)????50??
????3??????????李四???????????????????????????語(yǔ)文????88
希望查詢出如下結(jié)果：
?? ?CODE?SUM_STR(NAME)????B01????SUM_STR(S01)????B02????SUM_STR(S02)
????1????????????????張三????????????????????數(shù)學(xué)????????????????80?????????? 語(yǔ)文????????????75
????2????????????????王五????????????????????數(shù)學(xué)????????????????70??
????3????????????????李四????????????????????數(shù)學(xué)????????????????50?????????? 語(yǔ)文?????????????88
這個(gè)問題可以采用自定義的聚集函數(shù)來實(shí)現(xiàn)：
create
?
or
?
replace
?type?strcat_type?
as
?object?(
????cat_string?
varchar2
(
4000
),
????static?
function
?ODCIAggregateInitialize(cs_ctx?
In
?Out?strcat_type)?
return
?
number
,
????member?
function
?ODCIAggregateIterate(self?
In
?Out?strcat_type,value?
in
?
varchar2
)?
return
?
number
,
????member?
function
?ODCIAggregateMerge(self?
In
?Out?strcat_type,ctx2?
In
?Out?strcat_type)?
return
?
number
,
????member?
function
?ODCIAggregateTerminate(self?
In
?Out?strcat_type,returnValue?Out?
varchar2
,flags?
in
?
number
)?
return
?
number
)
/
------------------------------------
create
?
or
?
replace
?type?body?strcat_type?
is
??static?
function
?ODCIAggregateInitialize(cs_ctx?
IN
?OUT?strcat_type)?
return
?
number
??
is
??
begin
??????cs_ctx?:
=
?strcat_type(?
null
?);
??????
return
?ODCIConst.Success;
??
end
;
??member?
function
?ODCIAggregateIterate(self?
IN
?OUT?strcat_type,
???????????????????????????????????????value?
IN
?
varchar2
?)
??
return
?
number
??
is
??
begin
??????
if
?self.cat_string?
is
?
null
?
then
?????????self.cat_string?:
=
?value;
??????
end
?
if
;
??????
return
?ODCIConst.Success;
??
end
;
??member?
function
?ODCIAggregateTerminate(self?
IN
?Out?strcat_type,
?????????????????????????????????????????returnValue?OUT?
varchar2
,
?????????????????????????????????????????flags?
IN
?
number
)
??
return
?
number
??
is
??
begin
??????returnValue?:
=
?self.cat_string;
??????
return
?ODCIConst.Success;
??
end
;
??member?
function
?ODCIAggregateMerge(self?
IN
?OUT?strcat_type,
?????????????????????????????????????ctx2?
IN
?Out?strcat_type)
??
return
?
number
??
is
??
begin
?????? if self.cat_string is null then
?????????????????? self.cat_string :=? ctx2.cat_string;
????????? end if;
??????
return
?ODCIConst.Success;
??
end
;
end
;
/
-------------------
CREATE
?
OR
?
REPLACE
?
FUNCTION
?sum_str(input?
varchar2
?)
RETURN
?
varchar2
PARALLEL_ENABLE?AGGREGATE?USING?strcat_type;
/
-------最后查詢語(yǔ)句：
select
?code,sum_str(name),?sum_str(b01)?b01,sum_str(s01)?,sum_str(b02)?b02,sum_str(s02)
from
?javaeye?
group
?
by
?code?
order
?
by
?code
定義標(biāo)注的樣式，這個(gè)決定標(biāo)注顯示的方式，必須定義好
?1?
$package("com.bct.map");
?2?
com.bct.map.EncoderMarkerStyle?=?{
?3?
????'bigEncoder':{
?4?
????????graphicWidth:24,
?5?
????????graphicHeight?:?24,
?6?
????????graphicXOffset?:?-12,
?7?
????????graphicYOffset?:?-24,
?8?
????????externalGraphic?:?"scripts/map/img/channel2.png"
?9?
????},
10?
????'smallEncoder':{
11?
????????graphicWidth:16,
12?
????????graphicHeight?:?16,
13?
????????graphicXOffset?:?-8,
14?
????????graphicYOffset?:?-16,
15?
????????externalGraphic?:?"scripts/map/img/channel.gif"
16?
????},
17?
????'selectStyle':{
18?
????????pointerEvents:?"visiblePainted",
19?
????????border:"border:25?outset?#ff88ff",
20?
????????cursor:?"pointer",
21?
????????graphicWidth:24,
22?
????????graphicHeight?:?24,
23?
????????graphicXOffset?:?-12,
24?
????????graphicYOffset?:?-24,
25?
????????externalGraphic?:?"scripts/map/img/channel2.png"????
26?
????},
27?
????styleMap:?new?OpenLayers.StyleMap({
28?
????????????????????"select":?new?OpenLayers.Style({pointRadius:?24})
29?
????})
30?
}
marker層，擴(kuò)展vector層，通過point和style達(dá)到marker的效果
??1?$package("com.bct.map");
??2?$import("com.bct.map.EncoderMarkerStyle");
??3?com.bct.map.MarkerVectorLayer?=?OpenLayers.Class(OpenLayers.Layer.Vector,{
??4?????/**
??5??????*?parameters
??6??????*?attribute?filer對(duì)象
??7??????*/
??8?????getFeatureByAttribute?:function(attributes){
??9?????????var?feature?=?null;
?10?????????for(var?i=0;i<this.features.length;?++i){
?11?????????????var?attri?=?this.features[i].attributes;
?12?????????????var?find?=?false;
?13?????????????for(var?j?in?attributes){
?14?????????????????if(attributes[j]?==?attri[j]){
?15?????????????????????find?=?true;
?16?????????????????}
?17?????????????}
?18?????????????if(find){
?19?????????????????return?this.features[i];?
?20?????????????}????????????
?21?????????}
?22?????
?23?????},
?24?????addEncorderFeature:function(encNode,location){
?25?????????if(encNode&&this.repetitiveCheck(encNode.id)){
?26?????????????return;
?27?????????}
?28?????????var?attributes?=?OpenLayers.Util.extend({},?encNode.attributes);
?29?????????var?enc_point?=?new?OpenLayers.Geometry.Point(location.lon,location.lat);
?30?????????var?enc_Feature?=?new?OpenLayers.Feature.Vector(enc_point,attributes,com.bct.map.EncoderMarkerStyle['smallEncoder']);
?31?????????this.addFeatures([enc_Feature]);
?32?????????if(encNode.attributes['lon']&&encNode.attributes['lat']&&encNode.attributes['lon'].length>0){
?33?????????????return;
?34?????????}
?35?????????this.updateChannel(encNode.id,location.lon,location.lat);
?36?????},
?37?????addDeptFeature:function(deptNode,location){
?38?????????if(deptNode&&this.repetitiveCheck(deptNode.id)){
?39?????????????return;
?40?????????}
?41?????????var?attributes?=?OpenLayers.Util.extend({},?deptNode.attributes);
?42?????????var?enc_point?=?new?OpenLayers.Geometry.Point(location.lon,location.lat);
?43?????????var?enc_Feature?=?new?OpenLayers.Feature.Vector(enc_point,attributes,com.bct.map.EncoderMarkerStyle['smallEncoder']);
?44?????????
?45?????????this.addFeatures([enc_Feature]);
?46?????????
?47?????},
?48?????repetitiveCheck:function(entity_id){
?49?????????if(this.getFeatureByAttribute({id:entity_id})){
?50?????????????return?true;
?51?????????}
?52?????????return?false;
?53?????},
?54?????updateChannel:function(channel_id,lon,lat){
?55?????????Ext.Ajax.request({
?56????????????????url:?'deviceVideoEncoder.do?method=updateLonlat&id='+channel_id+"&lon="+lon+"&lat="+lat
?57?????????});
?58?????},
?59?????channelMarkerClick:function()?{
?60?????????var?features?=?this.selectedFeatures;
?61?????????if(features.length?>=0&&features[0])?{
?62?????????????feature?=?features[0];????????????
?63?????????????var?treeNodeAttribute?=?feature.attributes;
?64?????????????var?vedioPopForm?=?new?Ext.FormPanel({
?65????????????????????????????????????frame:true,
?66?????????????????????????????????labelAlign:?'top',
?67?????????????????????????????????bodyStyle:'padding:5px',
?68?????????????????????????????????width:?400,
?69?????????????????????????????????height:200,
?70?????????????????????????????????layout:?'fit',
?71?????????????????????????????????items:[{
?72?????????????????????????????????????????????xtype:'fieldset',
?73?????????????????????????????????????????????title:?'攝像頭信息',
?74?????????????????????????????????????????????autoHeight:true,
?75?????????????????????????????????????????????autoWidth:true,
?76?????????????????????????????????????????????html:"<p><font?color='red'?size='2'>名稱:"+treeNodeAttribute['text']
?77?????????????????????????????????????????????+"</font></p><p><font?color='red'?size='2'>通道號(hào):"+treeNodeAttribute['channelNumber']
?78?????????????????????????????????????????????+"</font></p><p><font?color='red'?size='2'>設(shè)備名稱:"+treeNodeAttribute['deviceunitName']
?79?????????????????????????????????????????????+"</font></p><p><font?color='red'?size='2'>所屬部門:"+treeNodeAttribute['deptName']
?80?????????????????????????????????????????????+"</font></p><p><font?color='red'?size='2'>經(jīng)緯度:"+treeNodeAttribute['lon']+","+treeNodeAttribute['lat']
?81?????????????????????????????????????}]
?82?????????????});
?83?????????????var?win?=?new?Ext.Window({
?84?????????????????width?:?420,
?85?????????????????height:?220,
?86?????????????????items?:?vedioPopForm
?87?????????????});
?88?????????????win.show();????????????
?89?????????}
?90?????},
?91?????cartoonFeature?:function(feature){
?92?????????this.drawFeature(feature,com.bct.map.EncoderMarkerStyle['bigEncoder']);
?93?????????var?runner?=?new?Ext.util.TaskRunner(1000);
?94?????????var?task?=?{
?95?????????????run:this.drawFeature,
?96?????????????scope:this,
?97?????????????args:[feature,com.bct.map.EncoderMarkerStyle['smallEncoder']],
?98?????????????interval:?1000
?99?????????}
100?????????runner.start(task);
101?????},
102?????removeSelectFeature:function(){
103?????????var?features?=?this.selectedFeatures;
104?????????for(var?i=features.length-1;?i>=0;?i--)?{
105?????????????feature?=?features[i];
106?????????????this.updateChannel(feature.attributes['id'],"","");
107?????????}
108?????????this.destroyFeatures(this.selectedFeatures);
109?????},
110?????monitorSelectFeature:function(){????????
111?????????var?features?=?this.selectedFeatures;
112?????????if(features.length?>=0&&features[0])?{
113?????????????feature?=?features[0];????????????
114?????????????var?treeNodeAttribute?=?feature.attributes;
115?????????????var?objId="mapAVShow"+treeNodeAttribute['id'];
116?????????????var?win?=?new?Ext.Window({
117?????????????????width?:?420,
118?????????????????height:?420,
119?????????????????html:"<div?id='mapEncoder'?width='100%'?height='100%'><object?width='100%'?height='100%'?id='"+objId+"'?classid='clsid:574B47E8-A366-4AB9-B2EA-57F145CA3780'></object></div>"
120?????????????});????????????
121?????????????win.show();
122?????????????Ext.lib.Ajax.request('GET','channel.do?method=getSiteId&accept=json&id='+treeNodeAttribute['id'],
123???????????????????????????????{success:?function(o){
124?????????????????????????????????????????var?encoderObj;
125?????????????????????????????????????????encoderObj=Ext.util.JSON.decode(o.responseText);
126?????????????????????????????????????????$import("com.bct.monitor.mapAVShow");
127?????????????????????????????????????????var?avshowObj=document.getElementById(objId);
128?????????????????????????????????????????var?avshow=new?com.bct.monitor.mapAVShow(avshowObj,
129?????????????????????????????????????????encoderObj[0].siteId,encoderObj[0].enCoderId,encoderObj[0].diveceUnitTypeId,'');
130?????????????????????????????????????????avshow.startVideo();
131?????????????????????????????????????????win.on("destroy",function?del(){
132??????????????????????????????????????????????????????????avshow.stopVideo();
133?????????????????????????????????????????});
134?????????????????????????????????}
135???????????????????????????????});?????????????
136?????????}
137?????}
138?});
在項(xiàng)目進(jìn)入性能測(cè)試階段，終于爆發(fā)了sql運(yùn)行緩慢，系統(tǒng)吞吐量下降，甚至一度出現(xiàn)oracle服務(wù)器cpu100%的情況。具體開發(fā)和測(cè)試人員報(bào)告情況，開始介入處理。
具體查找性能緩慢的過程略除。
發(fā)現(xiàn)一條sql運(yùn)行緩慢。通過跟蹤發(fā)現(xiàn)一下信息
select alias_p2.pendingid, alias_p2.workitemid, alias_p2.operationid, alias_p2.operationkey,
? 2? alias_p2.title, alias_p2.sendercn, alias_p2.operatedes, alias_p2.pendingstate,
? 3? alias_p2.parameter, alias_p2.createdate, alias_p2.deptname, alias_p2.completeddate ,
? 4? alias_p2.openstate , alias_p2.name, alias_p2.processinstanceid, alias_p2.asset
? 5?? from ( select alias_p1.pendingid, alias_p1.workitemid, alias_p1.operationid,
? 6?? alias_p1.operationkey, alias_p1.title, alias_p1.sendercn, alias_p1.operatedes,
? 7??? alias_p1.pendingstate, alias_p1.parameter, alias_p1.createdate, alias_p1.deptname,
? 8????? alias_p1.completeddate , alias_p1.openstate , alias_p1.name, alias_p1.processinstanceid ,
? 9??????? alias_p1.asset , rownum rn from(select alias_p.pendingid, alias_p.workitemid, alias_p.operationid,
?10??????? alias_p.operationkey, alias_p.title, alias_p.sendercn, alias_p.operatedes, alias_p.pendingstate,
?11??????? alias_p.parameter, alias_p.createdate, alias_p.deptname, alias_p.completeddate , alias_p.openstate ,
?12???????? pd.name, w.processinstanceid , eam_db.concatassetname( alias_p.operationkey, alias_p.operationid )
?13????????? asset from WF_Pending alias_p, WF_WorkItem w, WF_ProcessDefinition pd, WF_ProcessInstance pi
?14????????? where alias_p.ownerid='qinxue'?? and alias_p.pendingstate in(0,3,5,7,9,10,11,12)
?15??????????? and (alias_p.deptname='
審控部信息處
' or alias_p.deptname='' or alias_p.deptname is null)
?16??????????? and w.workitemid = alias_p.workitemid?? and pi.processinstanceid = w.processinstanceid
?17? and pi.completeddate is null?? and pd.processdefinitionid = w.processdefinitionid? order by alias_p.createdate desc) alias_p1 where rownum <=10)
alias_p2 where rn>=1;
?
已選擇
10
行。
?
?
執(zhí)行計(jì)劃
----------------------------------------------------------
?? 0????? SELECT STATEMENT Optimizer=CHOOSE (Cost=10 Card=1 Bytes=2507
????????? )
?
?? 1??? 0?? VIEW (Cost=10 Card=1 Bytes=2507)
?? 2??? 1???? COUNT (STOPKEY)
?? 3??? 2?????? VIEW (Cost=10 Card=1 Bytes=2494)
?? 4??? 3???????? SORT (ORDER BY STOPKEY) (Cost=10 Card=1 Bytes=167)
?? 5??? 4?????????? NESTED LOOPS (Cost=8 Card=1 Bytes=167)
?? 6??? 5???????????? NESTED LOOPS (Cost=7 Card=1 Bytes=162)
?? 7??? 6?????????????? NESTED LOOPS (Cost=6 Card=1 Bytes=134)
?? 8??? 7???????????????? TABLE ACCESS (FULL) OF 'WF_PENDING' (Cost=5
????????? Card=1 Bytes=111)
?
?? 9??? 7???????????????? TABLE ACCESS (BY INDEX ROWID) OF 'WF_WORKITE
????????? M' (Cost=1 Card=3 Bytes=69)
?
? 10??? 9?????????????????? INDEX (UNIQUE SCAN) OF 'SYS_C003694' (UNIQ
????????? UE)
?
? 11??? 6?????????????? TABLE ACCESS (BY INDEX ROWID) OF 'WF_PROCESSDE
????????? FINITION' (Cost=1 Card=1 Bytes=28)
?
? 12?? 11???????????????? INDEX (UNIQUE SCAN) OF 'SYS_C003684' (UNIQUE
????????? )
?
? 13??? 5???????????? TABLE ACCESS (BY INDEX ROWID) OF 'WF_PROCESSINST
????????? ANCE' (Cost=1 Card=1 Bytes=5)
?
? 14?? 13?????????????? INDEX (UNIQUE SCAN) OF 'SYS_C003662' (UNIQUE)
?
?
?
?
統(tǒng)計(jì)信息
----------------------------------------------------------
??????? 314? recursive calls
????????? 0? db block gets
????
?29433? consistent gets
????????? 0? physical reads
????
?????0? redo size
?????? 2153? bytes sent via SQL*Net to client
??????? 372? bytes received via SQL*Net from client
????????? 2? SQL*Net roundtrips to/from client
???????
101? sorts (memory)
????????? 0? sorts (disk)
???????? 10? rows processed
其中一致讀達(dá)到近3萬次，關(guān)聯(lián)調(diào)用出現(xiàn)314次。排序數(shù)值也非常多，顯然第一目標(biāo)是把這兩個(gè)數(shù)據(jù)降下來。
通過進(jìn)一步的分析。發(fā)現(xiàn)出現(xiàn)這些問題的主要原因是調(diào)用eam_db.concatassetname( alias_p.operationkey, alias_p.operationid )這個(gè)包。
開始考慮直接在sql外層做關(guān)聯(lián)，不用function來實(shí)現(xiàn)。利用聚集函數(shù)來合并數(shù)據(jù)。
著手建立：
聚集函數(shù)：?CREATE OR REPLACE FUNCTION F_ASSETLINK(P_STR VARCHAR2) RETURN VARCHAR2
AGGREGATE USING asset_link;
----------------------
創(chuàng)建type：CREATE OR REPLACE TYPE ASSET_LINK AS OBJECT (
STR VARCHAR2(30000),
STATIC FUNCTION ODCIAGGREGATEINITIALIZE(SCTX IN OUT ASSET_LINK) RETURN NUMBER,
MEMBER FUNCTION ODCIAGGREGATEITERATE(SELF IN OUT ASSET_LINK, VALUE IN VARCHAR2) RETURN NUMBER,
MEMBER FUNCTION ODCIAGGREGATETERMINATE(SELF IN ASSET_LINK, RETURNVALUE OUT VARCHAR2, FLAGS IN NUMBER) RETURN NUMBER,
MEMBER FUNCTION ODCIAGGREGATEMERGE(SELF IN OUT ASSET_LINK, CTX2 IN ASSET_LINK) RETURN NUMBER
)
------------------------------------------------------
創(chuàng)建type body：CREATE OR REPLACE TYPE BODY ASSET_LINK IS
STATIC FUNCTION ODCIAGGREGATEINITIALIZE(SCTX IN OUT ASSET_LINK) RETURN NUMBER IS
BEGIN
SCTX := ASSET_LINK(NULL);
RETURN ODCICONST.SUCCESS;
END;
MEMBER FUNCTION ODCIAGGREGATEITERATE(SELF IN OUT ASSET_LINK, VALUE IN VARCHAR2) RETURN NUMBER IS
BEGIN
SELF.STR := SELF.STR ||','|| VALUE;
RETURN ODCICONST.SUCCESS;
END;
MEMBER FUNCTION ODCIAGGREGATETERMINATE(SELF IN ASSET_LINK, RETURNVALUE OUT VARCHAR2, FLAGS IN NUMBER) RETURN NUMBER IS
BEGIN
RETURNVALUE := SELF.STR;
RETURN ODCICONST.SUCCESS;
END;
MEMBER FUNCTION ODCIAGGREGATEMERGE(SELF IN OUT ASSET_LINK, CTX2 IN ASSET_LINK) RETURN NUMBER IS
BEGIN
NULL;
RETURN ODCICONST.SUCCESS;
END;
END;
調(diào)整sql如下：
select alias_p.pendingid, alias_p.workitemid, alias_p.operationid,
?? alias_p.operationkey, alias_p.title, alias_p.sendercn, alias_p.operatedes, alias_p.pendingstate,
?? alias_p.parameter, alias_p.createdate, alias_p.deptname, alias_p.completeddate , alias_p.openstate ,
?? pd.name, w.processinstanceid
?? --,T.ASSETCLASS3? ASSET??
?? ,f_assetlink(d3.typename) ASSET
?? --,eam_db.concatassetname( alias_p.operationkey, alias_p.operationid )? asset
?? from WF_Pending alias_p, WF_WorkItem w,
?? WF_ProcessDefinition pd, WF_ProcessInstance pi
?? , tb_asset_dizhiyihao T,dic_app_wfconfig wfc,dic_app_assettype3 d3
?? where alias_p.ownerid='qinxue'??
?? and alias_p.pendingstate in(0,3,5,7,9,10,11,12)
?? and (alias_p.deptname='審控部信息處' or alias_p.deptname='' or alias_p.deptname is null)
?? and w.workitemid = alias_p.workitemid??
?? and pi.processinstanceid = w.processinstanceid
?? and pi.completeddate is null??
?? and pd.processdefinitionid = w.processdefinitionid
?? AND??? t.pk_businessid = alias_p.operationid
????????? and alias_p.operationkey = wfc.memo_1
????????? and wfc.wfconfig_code = t.wfconfig_code
?? and t.assetclass3 = d3.assettype3_id
?? group by alias_p.pendingid, alias_p.workitemid, alias_p.operationid,
?? alias_p.operationkey, alias_p.title, alias_p.sendercn, alias_p.operatedes, alias_p.pendingstate,
?? alias_p.parameter, alias_p.createdate, alias_p.deptname, alias_p.completeddate , alias_p.openstate ,
?? pd.name, w.processinstanceid
?? order by alias_p.createdate desc
得到統(tǒng)計(jì)數(shù)據(jù)如下：
C:\Documents and Settings\ibm>sqlplus /nolog
SQL*Plus: Release 10.2.0.1.0 - Production on 星期一 9月 10 19:27:33 2007
Copyright (c) 1982, 2005, Oracle.? All rights reserved.
SQL> conn jic/jic@name
已連接。
SQL> set autotrace traceonly
SQL> select alias_p.pendingid, alias_p.workitemid, alias_p.operationid,
? 2???? alias_p.operationkey, alias_p.title, alias_p.sendercn, alias_p.operatedes, alias_p.pendingstate,
? 3???? alias_p.parameter, alias_p.createdate, alias_p.deptname, alias_p.completeddate , alias_p.openstate ,
? 4???? pd.name, w.processinstanceid
? 5???? --,T.ASSETCLASS3? ASSET
? 6???? ,f_assetlink(d3.typename) ASSET
? 7???? --,eam_db.concatassetname( alias_p.operationkey, alias_p.operationid )? asset
? 8???? from WF_Pending alias_p, WF_WorkItem w,
? 9???? WF_ProcessDefinition pd, WF_ProcessInstance pi
?10???? , tb_asset_dizhiyihao T,dic_app_wfconfig wfc,dic_app_assettype3 d3
?11???? where alias_p.ownerid='qinxue'
?12???? and alias_p.pendingstate in(0,3,5,7,9,10,11,12)
?13???? and (alias_p.deptname='審控部信息處' or alias_p.deptname='' or alias_p.deptname is null)
?14???? and w.workitemid = alias_p.workitemid
?15???? and pi.processinstanceid = w.processinstanceid
?16???? and pi.completeddate is null
?17???? and pd.processdefinitionid = w.processdefinitionid
?18???? AND??? t.pk_businessid = alias_p.operationid
?19??????????? and alias_p.operationkey = wfc.memo_1
?20??????????? and wfc.wfconfig_code = t.wfconfig_code
?21???? and t.assetclass3 = d3.assettype3_id
?22???? group by alias_p.pendingid, alias_p.workitemid, alias_p.operationid,
?23???? alias_p.operationkey, alias_p.title, alias_p.sendercn, alias_p.operatedes, alias_p.pendingstate,
?24???? alias_p.parameter, alias_p.createdate, alias_p.deptname, alias_p.completeddate , alias_p.openstate ,
?25???? pd.name, w.processinstanceid
?26???? order by alias_p.createdate desc;
已選擇30行。
執(zhí)行計(jì)劃
----------------------------------------------------------
?? 0????? SELECT STATEMENT Optimizer=CHOOSE (Cost=19 Card=1 Bytes=205)
?? 1??? 0?? SORT (GROUP BY) (Cost=19 Card=1 Bytes=205)
?? 2??? 1???? NESTED LOOPS (Cost=17 Card=1 Bytes=205)
?? 3??? 2?????? HASH JOIN (Cost=16 Card=1 Bytes=191)
?? 4??? 3???????? HASH JOIN (Cost=11 Card=1 Bytes=183)
?? 5??? 4?????????? NESTED LOOPS (Cost=8 Card=1 Bytes=167)
?? 6??? 5???????????? NESTED LOOPS (Cost=7 Card=1 Bytes=139)
?? 7??? 6?????????????? NESTED LOOPS (Cost=6 Card=1 Bytes=134)
?? 8??? 7???????????????? TABLE ACCESS (FULL) OF 'WF_PENDING' (Cost=5
????????? Card=1 Bytes=111)
?? 9??? 7???????????????? TABLE ACCESS (BY INDEX ROWID) OF 'WF_WORKITE
????????? M' (Cost=1 Card=1 Bytes=23)
? 10??? 9?????????????????? INDEX (UNIQUE SCAN) OF 'SYS_C004347' (UNIQ
????????? UE)
? 11??? 6?????????????? TABLE ACCESS (BY INDEX ROWID) OF 'WF_PROCESSIN
????????? STANCE' (Cost=1 Card=1 Bytes=5)
? 12?? 11???????????????? INDEX (UNIQUE SCAN) OF 'SYS_C004334' (UNIQUE
????????? )
? 13??? 5???????????? TABLE ACCESS (BY INDEX ROWID) OF 'WF_PROCESSDEFI
????????? NITION' (Cost=1 Card=1 Bytes=28)
? 14?? 13?????????????? INDEX (UNIQUE SCAN) OF 'SYS_C004329' (UNIQUE)
? 15??? 4?????????? TABLE ACCESS (FULL) OF 'DIC_APP_WFCONFIG' (Cost=2
????????? Card=24 Bytes=384)
? 16??? 3???????? TABLE ACCESS (FULL) OF 'TB_ASSET_DIZHIYIHAO' (Cost=4
?????????? Card=310 Bytes=2480)
? 17??? 2?????? TABLE ACCESS (BY INDEX ROWID) OF 'DIC_APP_ASSETTYPE3'
????????? (Cost=1 Card=1 Bytes=14)
? 18?? 17???????? INDEX (UNIQUE SCAN) OF 'PK_DIC_APP_ASSETTYPE3' (UNIQ
????????? UE)
?
?
統(tǒng)計(jì)信息
----------------------------------------------------------
????????? 6? recursive calls
????????? 0? db block gets
??????? 847? consistent gets
????????? 0? physical reads
????????? 0? redo size
?????? 4102? bytes sent via SQL*Net to client
??????? 383? bytes received via SQL*Net from client
????????? 3? SQL*Net roundtrips to/from client
????????? 1? sorts (memory)
????????? 0? sorts (disk)
其中排序由101變?yōu)?次
一致讀降為847。下降非常客觀
關(guān)聯(lián)調(diào)用僅有6次。
此sql性能優(yōu)化非常可觀。至此優(yōu)化結(jié)束：)