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refrential integrity 1
- Thread starter sydev
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1
- #2
The standard approach is to read your source table as an input stream and do a referential integrity check in a transformer using a lookup or reference stage.
A lookup source can be a database table or it can be a hash file. Hash files tend to be the fastest type of lookup in DataStage so your job will run faster if you can dump your lookup fields into a hash file first, only export those fields you need.
Within the transformer you lookup the hash file based on your foreign key field. You can add a constraint to reject those rows without a lookup match, you can add an output link to save the rejected rows to a file or table, you can output an error message field with each row indicating what the problem was. There are lots of error handling options.
A lookup source can be a database table or it can be a hash file. Hash files tend to be the fastest type of lookup in DataStage so your job will run faster if you can dump your lookup fields into a hash file first, only export those fields you need.
Within the transformer you lookup the hash file based on your foreign key field. You can add a constraint to reject those rows without a lookup match, you can add an output link to save the rejected rows to a file or table, you can output an error message field with each row indicating what the problem was. There are lots of error handling options.
- Thread starter
- #3
hi
thank you so much for the help.
really appreciate it. will try all the combinations you gave. coz the error output of the refrential integrity check needs to be sent to another sequential file which should also generate the error details.
thanx again!
thank you so much for the help.
really appreciate it. will try all the combinations you gave. coz the error output of the refrential integrity check needs to be sent to another sequential file which should also generate the error details.
thanx again!
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