有人問(wèn)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(wèn)題可以采用自定義的聚集函數(shù)來(lái)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?
$package("com.bct.map");
?2?
com.bct.map.EncoderMarkerStyle?=?{
?3?
????'bigEncoder':{
?4?
????????graphicWidth:24,
?5?
????????graphicHeight?:?24,
?6?
????????graphicXOffset?:?-12,
?7?
????????graphicYOffset?:?-24,
?8?
????????externalGraphic?:?"scripts/map/img/channel2.png"
?9?
????},
10?
????'smallEncoder':{
11?
????????graphicWidth:16,
12?
????????graphicHeight?:?16,
13?
????????graphicXOffset?:?-8,
14?
????????graphicYOffset?:?-16,
15?
????????externalGraphic?:?"scripts/map/img/channel.gif"
16?
????},
17?
????'selectStyle':{
18?
????????pointerEvents:?"visiblePainted",
19?
????????border:"border:25?outset?#ff88ff",
20?
????????cursor:?"pointer",
21?
????????graphicWidth:24,
22?
????????graphicHeight?:?24,
23?
????????graphicXOffset?:?-12,
24?
????????graphicYOffset?:?-24,
25?
????????externalGraphic?:?"scripts/map/img/channel2.png"????
26?
????},
27?
????styleMap:?new?OpenLayers.StyleMap({
28?
????????????????????"select":?new?OpenLayers.Style({pointRadius:?24})
29?
????})
30?
}
marker層，擴(kuò)展vector層，通過(guò)point和style達(dá)到marker的效果
??1?$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(kāi)發(fā)和測(cè)試人員報(bào)告情況，開(kāi)始介入處理。
具體查找性能緩慢的過(guò)程略除。
發(fā)現(xiàn)一條sql運(yùn)行緩慢。通過(guò)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(wàn)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(lái)。
通過(guò)進(jìn)一步的分析。發(fā)現(xiàn)出現(xiàn)這些問(wèn)題的主要原因是調(diào)用eam_db.concatassetname( alias_p.operationkey, alias_p.operationid )這個(gè)包。
開(kāi)始考慮直接在sql外層做關(guān)聯(lián)，不用function來(lái)實(shí)現(xiàn)。利用聚集函數(shù)來(lái)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：)
數(shù)據(jù)庫(kù)遷移過(guò)程中需要目標(biāo)數(shù)據(jù)庫(kù)和原數(shù)據(jù)庫(kù)結(jié)構(gòu)相同和數(shù)據(jù)是最新。
為了保持最新數(shù)據(jù)和快速切換就不可以利用exp/imp的方式，利用data guard則有平臺(tái)的問(wèn)題。
在這種情況下，可以利用on prebuilt table選項(xiàng)創(chuàng)建mv。然后同步運(yùn)行一段時(shí)間。一次切換，刪除
mv，這種情況下可以保持同名的表。mv刪除。達(dá)到數(shù)據(jù)同步，切換的目標(biāo)。
select z.a,z.b,z.c
from (select lag(t.a,2)over(order by t.a) pp_val,
lag(t.a,1)over(order by t.a) p_val,
t.a,
lead(t.a,1)over(order by t.a) n_val,
lead(t.a,2)over(order by t.a) nn_val,
t.b,t.c from test2 t) z
where z.a = '1'
and ((z.p_val = '1' and z.pp_val = '1')
or (z.p_val = '1' and z.n_val = '1')
or (z.n_val = '1' and z.nn_val = '1'));
查詢結(jié)果xml化： select dbms_xmlquery.getXML(' select * from test')from dual;
表的歷史記錄：執(zhí)行：begin
dbms_wm.enableversioning('tablename','VIEW_WO_OVERWRITE')
則對(duì)這個(gè)表的cud操作都會(huì)記錄歷史，這個(gè)在系統(tǒng)中做歷史再好不過(guò)了。
還有終于被tom說(shuō)明：分析函數(shù)原來(lái)就是矩陣運(yùn)算，呵呵，終于知道這類函數(shù)的數(shù)學(xué)原理了，呵呵，真爽，總算知道怎么理解了。
還有寶貝兒遇到新項(xiàng)目，需要很深的會(huì)計(jì)知識(shí)了，還被老板亂說(shuō)，導(dǎo)致不好工作，希望她不要煩惱，開(kāi)心工作
配置:server.modules?
server.modules????????????? = (
??????????????????????????????? "mod_rewrite",
??????????????????????????????? "mod_redirect",
??????????????????????????????? "mod_access",
??????????????????????????????? "mod_status",
??????????????????????????????? "mod_scgi",
??????????????????????????????? "mod_accesslog" )
配置
index-file.names??????????? = ( "index.php", "index.html",
??????????????????????????????????????????? "index.htm", "default.htm" )
#### accesslog module
accesslog.filename????????? = "c:/depot/log/access.log"
static-file.exclude-extensions = ( ".php", ".pl", ".fcgi",".scgi" )?????? 標(biāo)紅的需要加上
## bind to port (default: 80)
server.port??????????????? = 8080------------------訪問(wèn)端口,我設(shè)置8080
## error-handler for status 404
server.error-handler-404?? = "/dispatch.scgi"
-----------------------------------------------
scgi.server = ("dispatch.scgi" => ((
"host" => "127.0.0.1",
"port" => 9999,
"check-local" => "disable"
)) )
scgi.debug=3
status.status-url = "/server-status"
status.config-url = "/server-config"
-------------------------------------
## server.virtual-* options
server.document-root??????? = "c:/depot/public"
記得這個(gè)需要設(shè)置到public目錄,不然按默認(rèn)的rails生成的文檔一些東西訪問(wèn)不來(lái)的
-----------------------------------------------------------------------------------------------------
需要注意的是你開(kāi)發(fā)的程序需要放在c盤下,不然找不到config/scgi.yaml這個(gè)文件
然后lighttpd必須裝在c盤下(當(dāng)前版本下1.4.11)
今天給數(shù)據(jù)庫(kù)執(zhí)行@spcreate.sql老是出
SP2-0734:unknown command beginning "spcreate.s..." - rest of line ignored.
郁悶壞了。經(jīng)過(guò)一番折騰原來(lái)是
solution Description:
?=====================
You need to enter a valid SQL*Plus command.
In this case, you cannot start svrmgrl from within SQL*Plus,
you have to start
svrmgrl from the command prompt.
This error will also occur when trying to execute a
the @
symbol is mapped to the key 'Kill' from the user's keyboard.
The
way to find out the current keyboard mapping in a unix environment is
using the command 'stty -a'.
The way to correct problem is to map 'Kill'
to some other keyboard symbol.
The command example would be
'
stty kill ^U'.
Having remapped the key you would then log into SQL*Plus
and execute script.
?-------------------------------紀(jì)念一下
如果出現(xiàn)空行報(bào)錯(cuò)的話
記得執(zhí)行:
SET SQLBLANKLINES ON
呵呵，最近吵架比較多，我們項(xiàng)目和另公司合作，經(jīng)常出現(xiàn)兩家吵架的事件，小弟不信參與其中。通過(guò)具體實(shí)踐，發(fā)現(xiàn)我現(xiàn)在很容易發(fā)現(xiàn)別人說(shuō)話的漏洞。然后常常質(zhì)問(wèn)對(duì)方大哥無(wú)法可說(shuō)，呵呵，痛快。
我想這是 我比較最近比較喜歡高手們爭(zhēng)論話題的帖子，建議想提高吵架水平的人多學(xué)學(xué)(別用在mm身上^^)
? 今天聽(tīng)了下oracle講座,一個(gè)感受，以后不敢操作數(shù)據(jù)庫(kù)了，發(fā)現(xiàn)對(duì)大多數(shù)數(shù)據(jù)庫(kù)命令產(chǎn)生的后果和影響都不是很清楚。想起以前切換雙機(jī)
的時(shí)候也出現(xiàn)eygle說(shuō)的問(wèn)題，然來(lái)真的對(duì)數(shù)據(jù)庫(kù)基礎(chǔ)知識(shí)預(yù)備不足啊。感覺(jué)以前真是可以稱為“虎膽”哦。難怪老幕以前佩服我！！！卡卡卡。
恩，感覺(jué)oracle入門現(xiàn)在都?jí)虿簧希桓以俳o別人解決問(wèn)題:)免得惹笑話。梳理了一下，估計(jì)也就對(duì)sql,集合的理解熟悉點(diǎn)，有點(diǎn)把我哦。低
調(diào)，低調(diào)......學(xué)習(xí)學(xué)習(xí)......
一個(gè)比較好的緩存中間件memcached。可以用做系統(tǒng)的各種緩存。支持分布式。使用方便。網(wǎng)上有很多介紹。多是linux&unix版。現(xiàn)在也有window32版本了。方便實(shí)現(xiàn)SNA架構(gòu)。在網(wǎng)站架構(gòu)上用處多多。
http://jehiah.com/projects/memcached-win32/啟動(dòng)，使用都是比較方便。可以到
http://www.danga.com/memcached/下各種客戶api。下載的client有使用test。一看就明白。
呵呵，真實(shí)好東西。
-----------------------
呵呵,發(fā)現(xiàn)plone中也用它做緩存了.
--------------------------
前幾天使用了一下，發(fā)現(xiàn)在win下面容易出現(xiàn)占用cpu 100％的情況,不知道什么原因,有誰(shuí)知道?沒(méi)有別的什么操作，insert/get操作而已.
查找中.......
奇怪，plone中為什么不出現(xiàn)！！！！
早上9點(diǎn)的飛機(jī),昨天晚上電話本來(lái)有很多話想說(shuō)。最后竟木木的什么也沒(méi)說(shuō)。
想象著空中的佳佳.......
想象著她忙忙碌碌的樣子......
小豬開(kāi)始了新的生活了......
不知道什么時(shí)候才可以再見(jiàn)到......
晚上等電話了......盼望著她盡快安定下來(lái)......
希望她在異國(guó)他鄉(xiāng)平平安安，健健康康的.
佳佳要飛的日子越來(lái)越近了,我已經(jīng)感到了一絲絲殘酷了。一直一直麻痹自己。
劫財(cái)劫色死了，哎，可憐的兩個(gè)小家伙，悲哀中!!!!!!!!
都是你的主人沒(méi)有好好照顧你，投胎時(shí)別在做龜了
在實(shí)際的軟件開(kāi)發(fā)過(guò)程中，我們常常可以看到這樣的情形：一方面是開(kāi)發(fā)人員指責(zé)需求人員不懂用戶的真正的需求，講解的需求和最后客戶的要求想去甚遠(yuǎn)或指責(zé)需求只是客戶的傳聲筒，拿到的需求不整理一下，就丟給開(kāi)發(fā)人員開(kāi)始做。另一方面是需求罵開(kāi)發(fā)人員笨，對(duì)需求一點(diǎn)不理解，只懂機(jī)械的做。
這樣的情況，常常導(dǎo)致系統(tǒng)不停的修改，bug不斷。客戶，需求，開(kāi)發(fā)都筋疲力盡，然后就是項(xiàng)目延期，直到死亡。
?????? 這樣的情況，相信每個(gè)做企業(yè)系統(tǒng)的開(kāi)發(fā)人員都遇到過(guò)，一提起這樣的問(wèn)題，大家只有擺腦袋，喃喃到“簡(jiǎn)直就是惡夢(mèng)，太難了”
^_^（希望不要勾起你痛苦的回憶）
???? 其實(shí)出現(xiàn)這樣的情況，大部分是應(yīng)為需求人員和開(kāi)發(fā)人員對(duì)問(wèn)題的思考模式不同導(dǎo)致的。在業(yè)務(wù)語(yǔ)言和業(yè)務(wù)規(guī)則向計(jì)算機(jī)語(yǔ)言和系統(tǒng)模型轉(zhuǎn)換之間有一個(gè)的過(guò)程。這個(gè)過(guò)程必須有一個(gè)銜接的人和模式來(lái)做這件事情。
???? 這個(gè)角色需要精通業(yè)務(wù)概念和系統(tǒng)實(shí)現(xiàn)方式。然后運(yùn)用分析模式方式把業(yè)務(wù)概念轉(zhuǎn)換為系統(tǒng)模型概念。需求人員理解業(yè)務(wù)總是自覺(jué)不自覺(jué)的把一些他們認(rèn)為是常識(shí)的思維放進(jìn)去，但是這部分只是不會(huì)出現(xiàn)在需求文檔中。這就需要分析人員不斷的和他需求聊天，不但的詢問(wèn)挖掘出來(lái)。然后寫(xiě)入概要設(shè)計(jì)和詳細(xì)涉及文檔中。
還有需求人員往往在寫(xiě)程序需要處理的邏輯的時(shí)候會(huì)不自覺(jué)的融入人類的思考模式，在其中加入一些智能判斷，但是這部分邏輯往往用計(jì)算機(jī)實(shí)現(xiàn)比較困難。這就需要分析人員的洞察能力，找到客戶的真正需求，然后轉(zhuǎn)換方式來(lái)實(shí)現(xiàn)。
????? 例如：有這樣一個(gè)需求是分析業(yè)務(wù)數(shù)據(jù)的。表中有27列，其中a，b，c，d，e，g，p，q，y，z為判斷過(guò)程中所涉及到的數(shù)據(jù)項(xiàng)，各項(xiàng)之間的關(guān)系為：b列中的傳輸系統(tǒng)速?zèng)Q定z列中的最大時(shí)隙編號(hào)。如2。5G系統(tǒng)對(duì)應(yīng)的最大時(shí)隙編號(hào)為16或8（保護(hù)）。10g系統(tǒng)對(duì)應(yīng)的最大時(shí)隙編號(hào)為64或32（保護(hù)）。
????? D列為與C列中站點(diǎn)相領(lǐng)的前向站點(diǎn)，e列為與c列中站點(diǎn)相領(lǐng)的后向站點(diǎn)。
????? G列與p列或q列為－－對(duì)應(yīng)關(guān)系，即唯一的一個(gè)端口對(duì)應(yīng)當(dāng)前傳輸系統(tǒng)的一個(gè)時(shí)隙。
???? ?p列和q列在一行中不同時(shí)出現(xiàn)。即同時(shí)只有前項(xiàng)時(shí)隙或后項(xiàng)時(shí)隙，兩者不同時(shí)存在。
????? y列為版本號(hào)，1代表設(shè)計(jì)版，2代表工程版。當(dāng)g列中相同的兩個(gè)端口對(duì)應(yīng)的z列不同的時(shí)隙時(shí)，以Y列為2的為準(zhǔn)。
?
（一下為客戶平時(shí)所用的人工分析方式）
分析過(guò)程：
1）首先根據(jù)系統(tǒng)名稱中的2。5G可以判斷出Z列的最大編號(hào)為16或8，對(duì)z列進(jìn)行觀察后得出最大編號(hào)為8。即存在8個(gè)時(shí)隙，編號(hào)分別為1~8.
2)? 將c列為“杭環(huán)城北路”站點(diǎn)下所有z列的數(shù)據(jù)觀察后可看出z列無(wú)5，6兩個(gè)時(shí)隙，于是初步判斷時(shí)隙在該站點(diǎn)為穿通。
3）c列為“杭環(huán)城北路”所對(duì)應(yīng)的D列前向站點(diǎn)為“衢州網(wǎng)通”。在z列中查找所有c列為“衢州網(wǎng)通”所對(duì)應(yīng)的時(shí)隙，發(fā)現(xiàn)5，6兩個(gè)時(shí)隙編號(hào)，且p，q兩列中僅q列有數(shù)據(jù)，說(shuō)明該時(shí)隙為后向時(shí)隙。可得出5，6兩個(gè)時(shí)隙的起始站點(diǎn)為“衢州網(wǎng)通”。因該時(shí)隙對(duì)應(yīng)的Y列均有1，2兩個(gè)數(shù)值，根據(jù)“各項(xiàng)間關(guān)系”，僅取Y列數(shù)值為2的數(shù)據(jù)為有效數(shù)據(jù)。
4）c列為“杭環(huán)城北路”所對(duì)應(yīng)的e列后向站點(diǎn)為“寧波網(wǎng)通”。在z列中查找所有c列為“寧波網(wǎng)通”所對(duì)應(yīng)的時(shí)隙，發(fā)現(xiàn)5，6兩個(gè)時(shí)隙編號(hào)。且p，q兩列僅p列有數(shù)據(jù)，說(shuō)明該時(shí)隙為前向時(shí)隙，可得出5，6兩個(gè)時(shí)隙的終止站點(diǎn)為“寧波網(wǎng)通”。因該時(shí)隙對(duì)應(yīng)的Y列均有1，2兩個(gè)數(shù)據(jù)，根據(jù)各項(xiàng)間干系,取Y列為2的數(shù)據(jù)為有效數(shù)據(jù)。
綜合判斷1~4不的判斷過(guò)程，可以得出結(jié)論：編號(hào)為5，6的兩個(gè)時(shí)隙以“衢州網(wǎng)通”為起點(diǎn)，途徑“杭環(huán)城北路”以“寧波網(wǎng)通”為終點(diǎn)
可以看到這個(gè)分析過(guò)程很不利于計(jì)算機(jī)話
（一下為我的分析方式）
------推薦的方式
-------其他
(未完待續(xù)........)
與人為善，種善因，得善果.
懂得說(shuō)謝謝，會(huì)說(shuō)謝謝，對(duì)人際關(guān)系很重要。
今天碰到一個(gè)剛畢業(yè)的小孩，給他教?hào)|西的時(shí)候，竟沒(méi)有聽(tīng)到一句感謝的話.
郁悶噢
昨天晚上做了一個(gè)奇怪的夢(mèng)，夢(mèng)到被一條蛇咬了一下。清楚的記得是手指被咬的，竟痛醒了，醒了還感到手指隱隱做痛
然后今天八卦的查了一下,周公解夢(mèng)如下：
蛇化龍得貴人助， 蛇咬人主得大財(cái)， 蛇多者主陰司事， 鶴上天主小口災(zāi)， 鸚鵡喚人主口舌， 燕子至有造客來(lái)，
呵呵，難道是真的？
然后今天很奇怪，一把黃楊木梳也折斷了.......可惜了，跟我兩年了。