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1
vote
1answer
48 views

Should I use a surrogate key in a mapping table?

I am deploying a mapping table which connects Items to ItemGroups Though an Item will only ever be in a single ItemGroup please accept a priori it is not appropriate in my use case to append a column ...
4
votes
2answers
165 views

removal of GUIDS used for all PK's, FKs & Clustered indexes

Inherited control over a database that has this nasty config. It also has large sections of code generated by NHibernate, including the gneeration of GUIDs before they get to the db so no chance of ...
2
votes
2answers
122 views

What can I do to make mysql use the expected indices?

What can I do to make mysql use the expected indices? I've got 4 tables, two containing resources, and the others containing historical changes. One pair uses indexes correctly, the other doesn't, ...
5
votes
2answers
154 views

In SQL Server, is it possible to have a PRIMARY KEY on a table without either CLUSTERED or NONCLUSTERED indexes on the same key?

In Sql Server (2008), is it possible to have a PRIMARY KEY on a set of columns without either CLUSTERED or NONCLUSTERED indexes on the same set of columns? I am aware of the fact that PRIMARY KEY and ...
0
votes
1answer
159 views

Impact of miss-ordered fields in a composite, clustered primary key?

I have tables where the primary key is something like this: -StoreID -BusinessDate Typically, there is one row for every store (~100) for every single day. One row for each store is inserted on a ...
2
votes
2answers
478 views

Clustered monotonically increased index insert performance

I have a table with field Id (bigint, IDENTITY) as primary key and clustered index on it. I inserted 400 rows and saw execution plan. I got: the relative query cost for this insertion 36% and for this ...
5
votes
2answers
1k views

How to convert primary keys into clustered primary keys for a great number of tables keeping referential identity

After discovering, that I better change the primary keys from non clustered to clustered. Cf this question about clustered indexes on identity columns, the next step is how to do this in a prcatical ...