One of the most obvious bottlenecks in the performance of tempdb is caused by PAGELATCH, in-memory latch contention on the allocation bitmap of each data file used. We can use one of the rules-of-thumb to choose what should be roughly the best number of files, but how then do you check to see whether you've got it right for your data and workload?
Today we have a guest editorial from Hakim Ali. Today Akim talks about why holding back out of politeness in code reviews may be a self-defeating practice.
Managing log files in a large enterprise environment can be an overwhelming task. In this article I will show you how to automate some of the work using SQL Alerts and Powershell 2.0
ReFS, the new file system with Windows Server 2012, should be good news, but its apparent lack of support for SQL Server is a serious concerned for Phil Factor.
I've been charged with coming up with a quick solution to audit login changes on my SQL Servers. However, there's no budget so I'm going to have to come up with basic scripts and the like to do the work. Is this tip we cover a solution for you to audit login changes.
This article identifies which indexes are used when T-SQL code runs, and proposes ways of improving these targeted indexes, leading to better performing code.
Use the power of regular expressions to cleanse your data right there inside the Data Flow. This transformation includes a full user interface for simple configuration, as well as advanced features such as error output configuration. Two regular expressions are used, a match expression and a replace expression. The transformation is designed around the named capture groups or match groups, and even supports multiple expressions.
There are some very interesting projects being performed with cloud services. Steve Jones talks about a few and the new computing without limits claim from Google.
Recently I was supporting a third party application. It queries to determine what tables it has permissions to before it proceeds with the rest of its functionality. We had implemented permissions based on the best practice of creating roles, assigning the permissions to the roles, and then making the users members of the roles. The application was querying INFORMATION_SCHEMA.TABLE_PRIVILEGES and of course didn't find any permissions directly against the user in question. We ended up granting explicit permissions to the user so the application would work, but I'm more interested in the general case. How can I determine permissions for an individual user?
Today Steve Jones talks about the accidental DBA and how they can find themselves in a position where they are responsible, but not well trained. In those cases, it's up to the individual to learn, but also the manager to ensure it gets done.
By Zikato
A cryptic message, a book cipher hidden in art provenance records, and a trail...
By Steve Jones
A customer was trying to compare two tables and capture a state as a...
By Zikato
When I'm looking at a query, I bet it's bad if I see... a...
Comments posted to this topic are about the item BIT_COUNT II
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Comments posted to this topic are about the item Why Your SQL Permissions Disappeared
In SQL Server 2025, I have a table (dbo.UserPermission) that contains this data:
UserID UserPermissions 15 23 37 4 NULLWhat is returned when I run this code:
select bit_count(UserPermissions) as PermissionCount from dbo.UserPermission where UserID = 4;See possible answers