Questions tagged [unique-data]
11 questions
1635
votes
11 answers
Which hashing algorithm is best for uniqueness and speed?
Which hashing algorithm is best for uniqueness and speed? Example (good) uses include hash dictionaries.
I know there are things like SHA-256 and such, but these algorithms are designed to be secure, which usually means they are slower than…
Earlz
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2 answers
Is there an elegant way to check unique constraints on domain object attributes without moving business logic into service layer?
I have been adapting domain-driven design for about 8 years now and even after all these years, there is still one thing, that has been bugging me. That is checking for a unique record in data storage against a domain object.
In September 2013…
Andy
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3
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2 answers
Should email be unique across application users?
I am working on a medical application which will be implemented for USA patients and health providers.
I want that there should be only 1 record of a user without any duplication. And I believe that putting a unique constraint on email across the…
naXa stands with Ukraine
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3
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1 answer
Reproducible uniqueness
So, I have a bunch of calls that are all being generated with a UUID1 throughout the day. At the end of the call the call is processed and some metrics around that call are generated and stored in Rethinkdb/Cassandra.
Each call will generate…
Jared Mackey
- 163
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2
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4 answers
Algorithm for permutations of a string of characters, with no duplicate orders
I've seen a lot of good questions about similar problems but not exactly what I'm looking for.
Given: a non-unique set of symbols (or characters)
(1, 1, 2, 3)
Expected: an output similar to this (the order isn't important, only the elements…
triplethreat78
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1
vote
4 answers
Is using multiple UUIDs decrease chance of collisions exponentially?
For example if you have a single UUID with a collision probability of x, if you concatenate 2 UUIDs, does the collision probability become x^2?
val0 = generate_uuid()
val1 = generate_uuid()
final_val = val0 + val1
So with each additional uuid,…
Joan Venge
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1
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Deduplicating data during batch processing
I constantly struggling to solve data duplication problems
efficiently (storing data from any source to RDBMSes). My main concern is speeding up inserts/batch processing.
Scenario: I read data from different sources, mainly in json
format and I need…
appl3r
- 149
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0
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2 answers
Ensure unicity of a 10 characters alphanumeric String
I have a requirement of developing a service that must generate each day few millions of random and unique alphanumeric String of length 10 (I can't increase this length, this is a customer prerequisite). Having a ID, the next ID must not be…
Rouliboy
- 137
- 7
0
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1 answer
CRM and external systems: How to associate data with contacts?
This question is about Dynamics CRM but is valid for every system that allows merging entities.
Having data related to a contact in multiple external systems, how would you know which contact the data is related to?
Using ContactId works until that…
Jan Sommer
- 170
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-1
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1 answer
How to maintain unique, customer facing Booking or Reservation Ids
I am facing trouble in creating a unique, customer facing Booking Id.
It's a simple thing to do at backend where we can create a UUID and maintain uniqueness. But the UUID looks ugly from a Frontend Customer perspective. I wouldn't want to keep…
blogbydev
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2 answers
Identifying similar customer data
I have a large database of customers. There's a need to identify customers who have two or more customer IDs.
This comes mostly from people at the front-desk creating new customers instead of searching for their existing IDs or doing a bad data…
azathoth
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