Newsequentialid error validating default


19-Apr-2020 22:47

newsequentialid error validating default-58

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So, here we're inserting 1 million records with their default values into 4 separate tables. This is probably the most contentious (but probably least important) issue surrounding the use of GUIDs in SQL Server, mainly because it's easy to have an opinion on it.I've written two tests for the UNIQUEIDENTIFIER data type - one to test Identity creation using NEWID() and NEWSEQUENTIALID() respectively. I've added a little bit extra formatting for clarity: Table name No. I think it's safe to say that most developers understand how basic disk allocation works - but often enterprise storage systems are a lot more complex than your developer box. INT columns have a numerical range of -2^31 to 2^31, and store only 4 bytes.You can also see that both UNIQUEIDENTIFIER columns use roughly double or more space than even a BIGINT; the size of an index has repercussions, which I will address later in this article.The fragmentation of an SQL Server index often goes unchecked - in fact, most developers that work with databases don't even know that indices can get fragmented, yet it can often be the first place to look when you run into sudden performance issues in your software.The following SQL will give us stats on all four tables: name Fragmentation Percent fill_factor page_count PK__My Guid Se__3214EC276477ECF3 0.71 0 3096 PK__My Guid__3214EC275FB337D6 99.08 0 4343 PK__My Int__3214EC275812160E 0.44 0 1608 PK__My Big Int__3214EC275BE2A6F2 0.48 0 2101 There's a tiny amount of fragmentation on the INT and BIGINT tables, and a little bit more for UNIQUEIDENTIFIER when NEWSEQUENTIALID() is used, but as you can see, the My Guid table (which uses NEWID() as the column default value) is almost 100% fragmented. Fragmentation slows down the retrieval of data from the table, meaning the SQL query engine has more work to do when it needs to scan the index. Well, NEWID() produces a pseudo-random GUID which is pretty much unpredictable, and 100% non-sequential.

I actually thought that clustered indices were a separate entity, stored along side the table.

However, it stands to reason that - due to the fact NEWSEQUENTIALID() is reset when Windows is restarted (and can subsequently start at a lower GUID seed value than the last seed) - that the use of NEWSEQUENTIALID() can still insert pages into the middle of an index, fragmenting the index quicker than you otherwise would with an INT or BIGINT.



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