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why we use hash file for lookup?
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Answer / hari
Hash partitioning
method is the key
based partition
method... And lookup
wich also compare and
retrieve the data
based on key
column... So by using
hash method wil
increase performance
in lookup...
| Is This Answer Correct ? | 5 Yes | 0 No |
Answer / jayam
Hash file is worked in key based . so lookup stage work on
comparasion of columns. so using hash file
| Is This Answer Correct ? | 3 Yes | 0 No |
Answer / bharath
Hash file is a refference table based on key fileds which
can provide fast access in lookups. Just to spped up the
lookup process we use hash files.
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / varma
Hash files is the only way to do lookup .. It is key based
and ensures no duplicates are present on that key. It wont
give an error if you use OCI or DB2 stage as lookup but the
results will be wrong...
| Is This Answer Correct ? | 1 Yes | 0 No |
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create a job that splits the data in the Jobs.txt file into four output files. You will direct the data to the different output files using constraints. • Job name: JobLevels • Source file: Jobs.txt • Target file 1: LowLevelJobs.txt − min_lvl between 0 and 25 inclusive. − Same column types and headings as Jobs.txt. − Include column names in the first line of the output file. − Job description column should be preceded by the string “Job Title:” and embedded within square brackets. For example, if the job description is “Designer”, the derived value is: “Job Title: [Designer]”. • Target file 2: MidLevelJobs.txt − min_lvl between 26 and 100 inclusive. − Same format and derivations as Target file 1. • Target file 3: HighLevelJobs.txt − min_lvl between 101 and 500 inclusive. − Same format and derivations as Target file 1. • Rejects file: JobRejects.txt − min_lvl is out of range, i.e., below 0 or above 500. − This file has only two columns: job_id and reject_desc. − reject_desc is a variable-length text field, maximum length 100. It should contain a string of the form: “Level out of range: <min_lvl>”, where <min_lvl> is the value in the min_lvl field. My Question is how do you write the stage variable for reject rows.
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