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SSMS: Saving changes is not permitted error.
Symptoms When you use Data Definition Language (DDL) to modify a table, and then you try to save the table in Microsoft SQL Server 2008, you may receive the following message: Saving changes is not permitted. The changes that you have made require the following tables to be dropped and re-created. You have either made... » read more
SQL Server Utility Explorer
Utility Explorer works inside of Management Studio, so it uses the same familiar interface that you already know. In Management Studio, to switch to the Utility Explorer, go up to the View menu, and then click on Utility Explorer. Using the SQL Server Utility application, they can gather information about the status, health and performance... » read more
SQL Server Activity Monitor
The SQL Server Activity Monitor gathers information about the monitored instance and displays the data in a series of collapsible panes. Right Click Server -> Activity Monitor The Activity Monitor is split up into a couple of different panes. Overview Processes Resource Waits data file input output Recent expensive queries Active expensive queries
Database Waits and Deadlocks
Waits Waits occur when system resources are busy processing other tasks, and new tasks are placed into a holding queue until resources free up. Locks on data are the only reason a task will encounter a wait. Bottlenecks and hardware resources are also common contributors to a task having to wait before proceeding. A dynamic... » read more
Transaction Isolation Types
As we know that, in order to maintain consistency in a database, it follows ACID properties. Among these four properties (Atomicity, Consistency, Isolation and Durability) Isolation determines how transaction integrity is visible to other users and systems. It means that a transaction should take place in a system in such a way that it is... » read more
Implicit vs Explicit Transactions
SQL Server supports both implicit and explicit transactions. Implicit transactions are initiated when the system’s session option “Implicit Transactions” is set to ON. In this state, any of a number of commands, including Create, Insert, Update, Delete, Drop, and Select will automatically begin a new transaction. To finalize the transaction, the user must specifically issue... » read more
Database Locking and Concurrency
When two or more users access the same tables at the same time, they’re considered concurrent users. If the operations that they are performing are simple reads, then SQL Server can easily accommodate both users simultaneously. But once one or more users begin updating and inserting records into a table that someone else is reading,... » read more
SQL Server FILESTREAM and FILETABLES
If your database design calls for the immigration of files such as audio, images or other document types, then you’ll want to investigate the SQL Server feature called Filestream. In the past, immigrating a database with unstructured binary data files meant providing links to their location on the disk drive. This is not an ideal... » read more
Linked Server
Not all of the information neededfor the design of an application has to be storedwithin a single instance of of SQL Server. Through a feature called Linked Servers. SQL Server’s database engine can query tables and other remote instances of SQL Server or even other products. Such as Microsoft Access Databases, Oracle Databases, Excel Spreadsheets... » read more