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4
votes
1answer
138 views

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

Inherited control over a database that has this nasty config, seems some poor decisions were made long before anyone who knew anything about databases got involved. It also has large sections of code ...
2
votes
2answers
98 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
144 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
154 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
457 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 ...