Newsequentialid error validating default
Create a table with a uniqueidentifier column 'Unique ID', and set the default to newsequentialid(). saving the design: 'Table_1' table - Error validating the default for column 'Unique ID'. On later inserts, sql server seems to forget the last sequential id, and starts a new sequence.Running this in ssms results in squential guids: insert into Table_1 (Name) values('test13a'); insert into Table_1 (Name) values('test14a'); insert into Table_1 (Name) values('test15a'); insert into Table_1 (Name) values('test16a'); insert into Table_1 (Name) values('test17a'); It's a bad function name.After some investigation we figured out that we could use the new OS function Uuid Create Sequential with some byte scrambling to convince the rest of SQL engine that guids are produced in sequential order.
newsequentialid is primarily to solve the issue of page fragmentation when your table is clustered by a uniqueidentifier. I set up two test tables, one where the newsequentialid column is the primary key and one where it is not (like yours), and in the primary key the GUIDs were always sequential. I do not know the internals/technical reasons it behaves that way, but it seems clear that newsequentialid() is only truly sequential when your table is clustered by it.When designing a database, early decisions can have a huge impact on the performance and storage requirements.Using sixteen bytes instead of four bytes for a primary key?To load the entity's data from the persistent storage, we use the generated class related to this entity's definition, create an instance of that class and order it to load the data of the particular entity via a Data Access Adapter object.As an example we're loading the entity identified with the customer ID "CHOPS" into an object.