In the past it was not possible to load a mapping table directly from a QVD file. We had to use some workarounds to break the optimized load like:
Mapping_Map:
Mapping
LOAD
Field1,
Field2
FROM qvdFile.qvd (qvd)
WHERE 1=1;
or
Mappping_Map:
Mapping
LOAD
Field1,
Field2,
1 as Field_temp
FROM qvdFile.qvd (qvd);
DROP FIELD Field_temp FROM Mapping_Map;
or
just loading the fields to a temporary table and then using a RESIDENT LOAD.
Also have a look at the excellent article from Rob Wunderlich on several QVD-topics (“QVD Questions and answers”) where he also mentioned this issue.
Although I have not read any offiicial announcement on that topic a direct load from a QVD file into a mapping load is now possible in QV 10 SR2.
Just a little testing script, if you want to ensure if it really works:
Map:
LOAD * INLINE [
F1, F2
A, A-mapped
B, B-mapped
C, C-mapped
];
STORE Map INTO Map.qvd(qvd);
DROP TABLE Map;
// The real testing scenario starts here ...
Mapping_Map:
Mapping
Load *
FROM Map.qvd (qvd);
Transactions:
Load
TransLineID,
TransID,
ApplyMap('Mapping_Map', Pick(Ceil(3*Rand1),'A','B','C'),'n/a') as Dim1,
Pick(Ceil(6*Rand1),'a','b','c','d','e','f') as Dim2;
Load
Rand() as Rand1,
IterNo() as TransLineID,
RecNo() as TransID
Autogenerate 1000
While Rand()<=0.5 or IterNo()=1;
Good News! Although there is now some need to improve our existing scripts to improve the load time by some seconds 
Stefan WALTHER
30 Comments
Excellent spot! I’ve a few documents to update also!
- Steve
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