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12
votes
2answers
395 views

Is there a penalty for using BINARY(16) instead of UNIQUEIDENTIFIER?

I've recently inherited a SQL Server database that uses BINARY(16) instead of UNIQUEIDENTIFIER to store Guids. It does this for everything including primary keys. Should I be concerned?
13
votes
1answer
553 views

SQL Server UniqueIdentifier / GUID internal representation

A colleague of mine sent me an interesting question, that I can't entirely explain. He ran some code (included below) and got somewhat unexpected results from it. Essentially, when converting a ...
1
vote
1answer
219 views

MySQL/InnoDB - Clustering Index with UUID

In MS SQL Server it is possible to cluster an index on a non-primary, non-unique key. For example, if I wanted to create a clustered index on the insert date to prevent page splits and fragmentation ...
5
votes
2answers
255 views

Guid vs. integer ID for unique fields

This is really a generic question. Suppose I have a replication pattern of a single write DB and multiple read DB replication slaves - I do not have to have GUID's as my unique IDs fields. Is that a ...
2
votes
0answers
57 views

ola hallengren Index Maintenance script - GUID Index

We been running ola hallengren Index Maintenance script and was ran into a problem with some indexes that have GUID as the Index Key, They are Frag and have a page count of 6,309, but they don’t get ...
6
votes
2answers
680 views

SQL Server: Create New GUID Values for Existing Index

I have an existing table with about 6 million rows. The relevant columns are: ID int not null PK Key uniqueidentifier not null Read/write on this table by Key lookup is probably something like 100 ...
2
votes
1answer
241 views

Almost sequential GUIDs vs random GUIDs?

I'm looking at using GUIDs (UUID) as primary key with clustered index in SQL Server. In my webb-app I have many clients who will create items client side in javascript and save them only now and ...
4
votes
2answers
220 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 ...