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Apr
18
revised What normal form does a surrogate key violate?
expanded based on ypercube's comment
Apr
18
comment What normal form does a surrogate key violate?
5NF is "obscure"?! More to the point, the "nothing but the key" cliché isn't a very precise description of 3NF. 3NF is concerned equally with all the candidate keys of a relation, not just one. A surrogate key won't violate 3NF unless it gives rise to some partial key dependency. Most people will understand "surrogate" to mean a simple (non-composite) key consisting only of arbitrary values, so a partial key dependency involving a surrogate is extremely unlikely.
Apr
18
answered What normal form does a surrogate key violate?
Apr
16
revised Using an RDBMS for querying tens of Terabytes of time-series data?
The text of the question indicates that the title should be 10s rather than 10ths
Apr
16
comment Using an RDBMS for querying tens of Terabytes of time-series data?
Exadata, Netezza, Greenplum, etc. These are some of the popular SQL DBMSs for handling 10s or 100s of Terabytes of data.
Apr
16
suggested approved edit on Using an RDBMS for querying tens of Terabytes of time-series data?
Mar
31
awarded  Yearling
Mar
9
awarded  Necromancer
Feb
20
comment Would it be considered as a bad practice to have multiple nullable FKs on a table in SQL Server
One nullable foreign key is one too many.
Feb
20
answered Would it be considered as a bad practice to have multiple nullable FKs on a table in SQL Server
Feb
17
awarded  Tag Editor
Feb
6
answered What computations can NOT be performed in standard SQL?
Jan
25
comment Shrinking log file
If your log files are growing regularly then shrinking like that is a massively counter-productive thing to do. Don't do it. By doing this you are invalidating the log backup sequence. My guess is you are using FULL recovery when you might be better off using SIMPLE.
Jan
25
comment Is an anomaly free relation necessarily normalized?
If "all normal forms" includes DKNF then the answer is no. A relation in 6NF does not have undesirable update, insertion or deletion anomalies in the usual sense but it still may not satisfy DKNF. On the other hand DKNF is not very important and is frequently irrelevant or unachievable.
Jan
20
awarded  Nice Answer
Jan
11
answered why doesn't time for a simple update scale linearly with the number of records?
Jan
9
comment SQL Server : primary keys advice to my whitepaper needed
It is premature optimization to allow the choice of clustered index to dictate the primary key of your tables. Very premature and very unnecessary!
Jan
9
comment SQL Server : primary keys advice to my whitepaper needed
All of your points are wrong because they apparently refer to the properties of clustered indexes and not primary keys. Clustered indexes and primary keys are two different things.
Jan
9
awarded  Cleanup
Jan
9
revised What Is The Point of a Primary Key?
"unique key" is a pointless tautology - keys are unique by definition. To be absolutely clear I have substituted "candidate key" instead.