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In a PDI transformation you are retrieving data from a large lookup table using a Database Lookup step from improve performance, you enable caching in the step and use the Load all data from table option.
In this scenario, which three statement s are correct about the data flow of the 'Database Lookup step? (Choose three.)
Suggested Answer: A, B, C
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27 comments · newest first
MY
My
10 months ago
B is crucial, without enough heap space it won't work!
DO
Dorian
11 months ago
E seems off, you can have multiple matches but only one is used.
CR
Crissy
11 months ago
Wait, are cached comparisons really case sensitive?
AN
Andree
11 months ago
I disagree with D, multiple matches can happen.
FR
Frank
11 months ago
A and B are definitely correct!
GI
Giovanna
12 months ago
I feel like option D is tricky; I thought every input row could have multiple matches, but maybe that's not the case here.
MA
Maurine
12 months ago
I practiced a similar question where case sensitivity was mentioned, but I can't recall if it's true for cached comparisons.
JE
Jeffrey
12 months ago
I think option B is definitely correct because if there's not enough heap space, the lookup won't work properly.
CA
Cary
1 year ago
I remember something about caching, but I'm not sure if it only passes matching rows or if it can pass others too.
IL
Iluminada
1 year ago
I'm feeling pretty confident about this one. The caching and lookup behavior is something I've worked with before, so I should be able to identify the correct statements.
MA
Marsha
1 year ago
Okay, I think I've got a handle on this. The key is understanding how caching works in the Database Lookup step and the implications for performance and data flow.
HI
Hillary
1 year ago
Hmm, I'm a bit confused about the "Load all data from table" option. Does that mean the entire lookup table is loaded into memory? I'll need to double-check that.
KA
Kayleigh
1 year ago
This looks like a tricky question about database lookup caching. I'll need to carefully read through the options and think through the data flow.
LI
Lizbeth
1 year ago
This is a good opportunity to demonstrate my understanding of PDI data flow and lookup performance optimization. I'll make sure to read each option carefully.
LA
Latosha
1 year ago
Psychometric testing feels more like an HR function, and I'm pretty certain that deciding strategic objectives falls outside an operational line manager's duties.
MA
Magdalene
2 years ago
I believe statement D is correct, each input row should have only one matching row in the lookup table.
HE
Helene
2 years ago
I agree with statement B, we need enough memory to store lookup fields.
DE
Deja
2 years ago
I think statement A is correct because only matching rows are passed through.
MA
Margot
2 years ago
Hah, this question's got me scratching my head. I'll go with B, D, and E. Hopefully, I don't end up in the 'lookup table of shame'!
MI
Millie
2 years ago
Ah, the joys of database lookups! I'm feeling confident with A, B, and D. Can't forget the importance of that single match!
ST
Stefany
2 years ago
Hmm, let's see... I'd go with B, C, and E. The case sensitivity thing is a real gotcha, you know?
FR
Francoise
2 years ago
E) Only one matching row is used from the Lookup table.
LE
Leeann
2 years ago
C) Cached comparisons are case sensitive.
OM
Omer
2 years ago
B) There must be enough allocated heap space to store the lookup fields allocated heap space to store the lookup fields in memory.
DE
Della
2 years ago
Woah, this one's a toughie! But I think A, B, and E are the correct answers. Gotta love that caching, am I right?
LA
Lajuana
2 years ago
Yes, that's correct. Caching can make a big difference in data retrieval speed.
LI
Lili
2 years ago
I think you're right, A, B, and E are correct. Caching really helps with performance.