Does prefixing system or general table names with "Sys" fine in Sql Server?

Question

In Sql Server there's sys Schema. sys.Columns, sys.Tables. I have a general tables which I need to rename to SysUsers, SysRoles, etc.

Is it fine to do that? I will not use Sys schema. I just will prefix tables with Sys I find SQL Server itself do it generally

select * FROM SysColumns      // NOTE its not sys.Columns

Answer 1

TL;DR: Don't do this.

You will have name clashes and your objects will be unusable.

---

I strongly recommend against this. If you have any objects where the names clashes you will not be able to reference it.

Take this simple example:

USE master;
GO

CREATE DATABASE Sillytest;
GO

USE Sillytest;
GO

SELECT *
FROM syscolumns; 
GO

SELECT *
FROM dbo.syscolumns; 
GO
SELECT *
FROM sys.syscolumns; 

GO

CREATE TABLE dbo.syscolumns (ID int, ColumnName sysname);
GO

SELECT *
FROM syscolumns; 
GO

SELECT *
FROM dbo.syscolumns; 
GO
SELECT *
FROM sys.syscolumns; 
GO

USE master;
GO

DROP DATABASE Sillytest;
GO

Every single reference to syscolumns, whether prefixed by dbo, sys, or not at all, references the object sys.syscolumns. Not one of those statements returns data from the (empty) user table I created dbo.syscolumns. Notice, as well, that the reference to dbo.syscolumns before I create a table of that name also works.

Yes, you can create the objects, but if the name already exists as a sys.sys{object} object, then you won't be able to use it.

Further to this, there is already an object sys.sysusers, so we actually have the answer; don't do it, you already have a clash.