TSQL - Mohammad Darab

February 8, 2017April 27, 2018

Stuff and Replace Function in SQL Server : Detailed Description

(This is a guest blog post by Daniel Jones (li | t | fb). Daniel is a SQL Server DBA and contributor at SQL Tech Tips. Having 2 + years of experience in SQL recovery and system infrastructure.)

In SQL Server, STUFF and REPLACE functions are used to replace the characters in a string. Both functions play an important role in Transact-SQL with performing the distinct functionality. In the following section, we are going to discuss about Stuff and Replace function in detail. Continue reading “Stuff and Replace Function in SQL Server : Detailed Description”

November 9, 2015April 27, 2018

How to Create LOGON Trigger in SQL Server

Most recently I had to create a SQL Logon trigger that set a limit to sessions a user could open in SQL Server.

For example, I log into SSMS and cannot open more than 10 sessions. This logon trigger will enforce that I don’t exceed 10 concurrent sessions. Continue reading “How to Create LOGON Trigger in SQL Server”

October 17, 2015April 27, 2018

INDEX REORGANIZE vs REBUILD in SQL Server

This blog post is meant to help distinguish the differences between REORGANIZE and REBUILD when it comes to index fragmentation. If you are serious about learning more of the internals of how indexing works in SQL Server, watch Kimberly Tripp’s (blog | twitter) video called, “Index Internals” here (open link and scroll down to “Index Internals”). Continue reading “INDEX REORGANIZE vs REBUILD in SQL Server”

October 15, 2015April 27, 2018

How to Find SQL Server Edition Information

Most recently I had to figure out the edition (Enterprise, Standard, etc.) of SQL Server running on a specific production database server. The client wanted to know to what extent was the database server STIG’d. Continue reading “How to Find SQL Server Edition Information”

October 13, 2015April 27, 2018

SQL Server DDL vs DML

For the longest time I’ve had a hard time remembering the difference between SQL Server DDL vs DML statements. I had a hard time remembering what statement fell under what category. Was INSERT, UPDATE, DELETE a DML command or DDL? What about CREATE / ALTER? It was all confusing to me. Continue reading “SQL Server DDL vs DML”

September 20, 2015April 27, 2018

How to Stop & Delete a SQL Server Trace

There were a few times where I had to delete/close an existing SQL Server Trace and create a new one. It’s a 2-step process to completely remove a SQL Server Trace. First, you stop the trace. Second, you delete/close it.

sp_trace_setstatus takes 2 parameters, trace id and status. Continue reading “How to Stop & Delete a SQL Server Trace”

September 10, 2015April 27, 2018

How to Find the Space Used in Your Data Files

I recently had to resize a data file on of my production SQL Server databases and needed to know an appropriate size to resize it to. So, I created this simple script that queries sys.database_files and brings back the File ID, File Location, File Name, Original Size, Space Used and Space Left.

[snippet id=”22″] Continue reading

September 1, 2015April 27, 2018

Msg 5041, Level 16, State 1, Line 1 – Resize Datafile

Recently, I wanted to resize the tempdb file size to 2 MB so I ran the below script:

ALTER DATABASE tempdb MODIFY FILE (name = tempdb, size = 2MB);
GO

and got the below error:

Msg 5041, Level 16, State 2, Line 1
MODIFY FILE failed. File ‘tempdb’ does not exist. (screenshot below)

Msg 5041, Level 16, State 2, Line 1 Continue reading “Msg 5041, Level 16, State 1, Line 1 – Resize Datafile”

August 26, 2015October 17, 2015

How to Find Last Time SQL Server Restarted

If you want to find the last time your SQL Server was restarted, the quickest way is to query the sys.dm_os_sys_info DMV for the ‘sqlserver_start_time’ column (See snapshot below)