what is optimised load and unoptimised load with example ??

[nikhilgarg]

Hey,

Can anyone tell me what is optimised load and unoptimised load with example ??

THanx.

[MK_QSL]

Optimized and unoptimized QVD Load Situations? thanks in advance

[jagan]

Hi,

Check this thread

Optimized and Non Optimized loading

Regards,

Jagan.

[nikhilgarg]

HEy,

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[nikhilgarg]

Hey,

Thanks but i still did not get the idea what does this optimised and unoptimised deals with. Can you please explain breifly when load is optimised and when unoptimised ??

Thanks.

[jagan · Accepted solution]

Hi,

This is the content in that thread

Hi,

QVD files can be read in two modes: standard (fast) and optimized (faster). The selected mode is determined automatically by the QlikView script engine. Optimized mode can be utilized only when all loaded fields are read without any transformations (formulas acting upon the fields), though the renaming of fields is allowed. A WHERE clause causing QlikView to unpack the records will also disable the optimized load.

1)F1 as NewField  -  Renaming allowed, so it is optimized load

Ex:

LOAD

Field1 AS Date,

Field2 AS Sales

FROM DataSource;

2)F1 * 2 as NewField – Transformation is not allowed, so it is non optimized load

Ex:

LOAD

Field1 AS Date,

Field2 AS Sales,

Discount,

Field2 - Discount AS NetSales   // This is a transformation

FROM DataSource;

3)1 as NewField – Cannot add a new field, so it is non optimized load

LOAD

Field1 AS Date,

Field2 AS Sales,

1 AS Flag   // Adding new field

FROM DataSource;

4)WHERE Exists(F1) –  We can use Single Field in Exists(), so it is an Optimized load

LOAD

Field1 AS Date,

Field2 AS Sales

FROM DataSource

WHERE Exists(Field1);

5)where exists(F1, Some Transformation) – We cannot use Multiple Field in Exists(), so it is a non Optimized load

LOAD

FirstName,

LastName,

Sales

FROM DataSource

WHERE Exists(Field1, FirstName& ' ' &LastName);

Hope this helps.

Regards,

Jagan.

[nikhilgarg]

Hey,

Thanks. So should i assume that the cases that you have mentioned above are the only cases for Optimisation and Non optimisation ?? No other case except these will come under optimisation and non optimisation ??

THanks.

[jagan]

Hi,

I think Yes.

Regards,

Jagan.

[nikhilgarg]

Hey,

Can you also tell em when will be qvd load in standard mode ??

[jagan]

Hi,

If you are doing any transformations like calculations then it is in Standard mode.

Column1 * Column2 AS NewColumn1

Regards,

Jagan.