Joining on VarBinary(8000) column
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Hi All,
Having inherited a poorly performing database we've redesgined and come up with some potential issues.
One table we have a surrogate key made up of 16 columns, previously there was clause on the join for all 16 columns. We had changed this to a checksum however it became apparent that there was an instance where a duplicate value appeared. As a result we are now moving to make this a HashByte column using SHA2_256 algorithm.
What we are now concerned with performance of the join given the column is varbinary(8000
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Thanks for posting your issue and hopefully someone will answer soon.
This is an automated bump to increase visibility of your question.
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Wow! Can you find the original designers and yell at them a bit
I would look for a completely different alternative if possible. Is this a data warehouse? IF POSSIBLE: I would create a key on a single identity column. Then, within a load procedure/process, I would manage data integrity. In other words, I would shift the responsibility of managing data integrity from database objects like keys to the loading process. I would also offload referential integrity to the loading process. Again, since I don't know the context you are operating within, none of this may be possible.
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