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how do we come to know that whether data model is correct or not?
hi,
the data model issue can differ from one dashboard to another, ideally the star-schema model is the best one that compromise between performance/RAM usage and further maintenance on the schema.
however i cannot tell in your case, it depends on the size of dashboard and the need behind it, sometimes you cannot follow the star-schema perfectly and end up having a snow-flake data model.
i recommend checking the book Qlikview 11 for developers it will give you a very good insight on the data modeling and best practices.
1) No loop in data model
2) less possible syntetic keys
3) no tables "Alone"
Hi,
Should be a Star Schema.
The fields should be correctly linked.
Only fields that are required must be used, all others ignored.
No Synthetic keys (will show sync$$ tables in the data model if these are there)
No Loops (Dotted lines will be shown if there are loops)
thanks,
Rajesh Vaswani
i got 2 synthetic keys and i replace with key,zzkey both syn keys removed like f1 and f2 and f3 as key,
in same way i removed second syn key name is zzkey. now with addition of another table i am getting dottedline relation ship between zzkey and addition table name is 'pom'
table1: having fields key,abc
table2: zzkey,def
table 3 having def,key
here i am getting def relationship in dotted lines what i have to do?
i did here def as df and discoonected the relation ship between table2 and table 3
pls tell me ami correct ? is there any other way to do ? pls urgent?
hi manoj change the field name by making rename where u got dotted line between tables
rename it as [porn.zzkey ]
Try to left join 2 tables (according to your logic ...) the dots lines (loops) will disappear. Do not care about sinthetic keys at the moment
check for below
shortest path
no synthetic key and circular loops
load time of application
on selection response of application
opening time of application
access time to users( i mean how soon opening @ client site)
hope this may helps