The Model ClauseA case study at E.On

Introduction

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Oliver.Hayden@eon.com

A little about me, the company I work for, the team I work in and today’s presentation.

A brief introduction to the model clause

Example statement:

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http://docs.oracle.com/cd/B28359_01/server.111/b28313/sqlmodel.htm

select empno, ename, salfrom empwheredeptno = 10

MODELdimension by (empno)measures (ename, sal)rules ()

/

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Scenario 1: Quarterly Critical Patch Updates

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SID Primary host

Standby host

orcl1 box1 box3

orcl2 box3 box4orcl3 box4 noneorcl4 box4 box5orcl5 box2 box1

orcl6 box6 noneorcl7 box7 box6orcl8 box8 none

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create table lod (sid varchar2(20), host varchar2(20), dbrole varchar2(10));

insert into lod values ('orcl1','box1','prmy');insert into lod values ('orcl1','box3','stby');insert into lod values ('orcl2','box3','prmy');insert into lod values ('orcl2','box4','stby');insert into lod values ('orcl3','box4','prmy');insert into lod values ('orcl4','box4','stby');insert into lod values ('orcl4','box5','prmy');insert into lod values ('orcl5','box2','prmy');insert into lod values ('orcl5','box1','stby');insert into lod values ('orcl6','box6','prmy');insert into lod values ('orcl7','box7','prmy');insert into lod values ('orcl7','box6','stby');insert into lod values ('orcl8','box8','prmy');

commit;

var n numberbeginselect count(*) into :n from lod;end;/

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select clump, sid, host, dbrole, rnfrom lodmodeldimension by (sid, host, dbrole)measures (rownum as clump,rownum as rn)rulesiterate(10000) until (iteration_number =:n) (--update clumps for the hosts to the lowest value currently for identical hostsclump[any,host,any]=least

(nvl(min(clump) over (partition by host order by clump rows

between unbounded preceding and unbounded following),:n))

,--update clump for the sids to be the lowest of current clump valuesclump[any,host,any]=least

(nvl(min(clump) over (partition by sid order by clump rows between

unbounded preceding and unbounded following),:n))

)/

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Intermediate step.

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Intermediate step.

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Intermediate step.

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Final output.

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alter table lod add (version varchar2(20) default '10g');

update lod set version ='11g' where sid = 'orcl2';commit;

The previous example was simplified, here we also take into account Oracle version

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select version, clump, sid, host, dbrole, rnfrom lodMODELpartition by (version)dimension by (sid, host, dbrole)measures (rownum as clump,rownum as rn)rulesiterate(10000) until (iteration_number =:n) (--update clumps for the hosts to the lowest value currently for identical hostsclump[any,host,any]=least

(nvl(min(clump) over (partition by host order by clump rows

between unbounded preceding and unbounded following),:n))

,--update clump for the sids to be the lowest of current clump valuesclump[any,host,any]=least

(nvl(min(clump) over (partition by sid order by clump rows between

unbounded preceding and unbounded following),:n))

)order by clump/

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Scenario 2: Missing data in a time-series

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Original requirement arose during a project to investigate whether objects are being used.

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desc dbm_apps.monitor_usage_aud@gfcspw01

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with data as(select day as orig_day, value,day start_dt, nvl(lag(day) over (order by day desc nulls last),day)-1 end_dtfrom (select trunc(datefield) as day, count(*) as value from dbm_apps.monitor_usage_aud@gfcspw01group by trunc(datefield))order by day)select value as quantity,s2 as time_periodfrom dataMODEL partition by (orig_day, start_dt, end_dt) dimension by (0 as z) measures (1 x,value, start_dt s2, end_dt e2) rules sequential order iterate (5) until ( previous(s2[ITERATION_NUMBER]) >= previous(e2[ITERATION_NUMBER]) )(x[ITERATION_NUMBER]=ITERATION_NUMBER,s2[ITERATION_NUMBER]=cv(start_dt)+ITERATION_NUMBER,e2[ITERATION_NUMBER]=cv(end_dt))order by s2, value

Scenario 3: team rota

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There is a need for our team assignments to be easily visible to both ourselves and our customers. We also need to make sure that resource has been assigned.

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create table pp_rota(DUTY VARCHAR2(20),PERSON NOT NULL VARCHAR2(20),WHEN DATE)/

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select when , duty||'.'||person, duty, decode(person,'MISSING',null,person) as real_personfrom pp_rotamodelpartition by (when)dimension by (duty)measures (person)rules (person['livebuild']=nvl(person[cv(duty)],'MISSING'),person['backflush']=nvl(person[cv(duty)],'MISSING'),person['systest']=nvl(person[cv(duty)],'MISSING'),person['ep']=nvl(person[cv(duty)],'MISSING'))order by when, duty

Wrap up...

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