What is SQL Server extended property

Extended Properties in SQL Server allows us to create additional customized properties to store additional information. Extended Properties are a way to create a self-documenting database. … The value of Extended Properties is a SQL variant and can contain up to 7500 bytes of data.

What is extended properties in SQL Server?

Extended Properties in SQL Server allows us to create additional customized properties to store additional information. Extended Properties are a way to create a self-documenting database. … The value of Extended Properties is a SQL variant and can contain up to 7500 bytes of data.

How do I get extended properties in SQL Server?

We can add extended properties to almost all SQL Server objects by right clicking on the object-> select properties-> select “Extended Properties” and add new properties to the object. So, after adding the new properties we might need to query those properties in the future. All done!

What is SQL Server extent?

Extents are the basic unit in which space is managed. An extent is eight physically contiguous pages, or 64 KB. This means SQL Server databases have 16 extents per megabyte.

What is MS_Description extended property?

Microsoft provides one extended property, MS_Description, which can be used from both Enterprise Manager and SSMS to provide a description of the object to which it is bound. … The designers of extended properties sensibly placed no restrictions on the properties that one could attribute to database objects.

What is data in data base?

What Does Data Mean? Data, in the context of databases, refers to all the single items that are stored in a database, either individually or as a set. Data in a database is primarily stored in database tables, which are organized into columns that dictate the data types stored therein.

How can I see table properties in SQL?

In Object Explorer, select the table for which you want to show properties.
Right-click the table and choose Properties from the shortcut menu. For more information, see Table Properties – SSMS.

What is SQL Server architecture?

Microsoft SQL Server is a client-server architecture. MS SQL Server process starts with the client application sending a request. The SQL Server accepts processes and replies to the request with the processed data. The SQL Server is constituted of two main components: Database Engine.

What is a database extent?

An extent consists of a collection of contiguous pages that store data for a given table. When you create a table, the database server allocates a fixed amount of space to contain the data to be stored in that table. (See Tables.) When this space fills, the database server must allocate space for additional storage.

How do I fix fragmentation in SQL Server?

You can fix index fragmentation by rebuilding or defragmenting the index. If the fragmentation level is low, you can defragment the index. If it’s high, then you should rebuild the index. You can use SQL Server Management Studio (SSMS) or T-SQL to get started managing index fragmentation.

Article first time published on

How do I add a column description in SQL Server?

Right click on the column of interest and click on the “Modify” option. Look in the “Column Properties” window (in the lower right in my GUI)\ Look in the “Table Designer” sub section. Modify the value for the “Description” row.

What is Sql_variant?

The sql_variant data type allows a table column or a variable to hold values of any data type with a maximum length of 8000 bytes plus 16 bytes that holds the data type information, but there are exceptions as noted below. This allows you to have flexibility in the type of data that is stored.

How do I find the description of a table in SQL Server?

Just select table and press Alt + F1 , it will show all the information about table like Column name, datatype, keys etc.

What is acid property in SQL?

In the context of transaction processing, the acronym ACID refers to the four key properties of a transaction: atomicity, consistency, isolation, and durability. Atomicity. All changes to data are performed as if they are a single operation. That is, all the changes are performed, or none of them are.

How do I change properties in SQL Server?

To view or change server properties In the details pane, right-click SQL Server (<instancename>), and then select Properties. In the SQL Server (<instancename>) Properties dialog box, change the server properties on the Service tab or the Advanced tab, and then select OK.

How do I change table properties in SQL?

In Object Explorer, right-click the table with columns for which you want to change the scale and select Design. Select the column for which you want to modify the data type. In the Column Properties tab, select the grid cell for the Data Type property and choose a new data type from the drop-down list.

What are the 4 types of database?

hierarchical database systems.
network database systems.
object-oriented database systems.

What are the 5 types of databases?

Relational databases. Relational databases have been around since the 1970s. …
NoSQL databases. …
Cloud databases. …
Columnar databases. …
Wide column databases. …
Object-oriented databases. …
Key-value databases. …
Hierarchical databases.

What is DBMS and SQL?

Database management system (DBMS) is a software that manage or organize the data in a database. … Best examples of DBMS are – MYSQL, ORACLE, dBase etc. 2. Structured Query Language (SQL) : Structured Query Language (SQL) is designed for managing data in a relational database management system(RDBMS).

What is segment and extent?

Introduction to Data Blocks, Extents, and Segments The next level of logical database space is an extent. An extent is a specific number of contiguous data blocks allocated for storing a specific type of information. The level of logical database storage greater than an extent is called a segment.

What is table space in SQL?

A tablespace is a unit of database storage that is roughly equivalent to a file group in Microsoft SQL Server. Tablespaces allow storage and management of database objects within individual groups.

How many types of pages are there in SQL Server?

As far as I know, there are about 14 types of pages in SQL Server data file. Type 1 – Data page. Small LOB value(s), multiple types and rows.

What are the 3 types of SQL database server architecture?

Protocol Layer.
Relational Engine.
Storage Engine.

What is the difference between MySQL and SQL Server?

Both MySQL and SQL Server, both are relational database management systems or RDBMS. MySQL is open source and is free to use whereas SQL Server is licensed product of Microsoft. … MySQL is owned by Oracle. SQL Server is developed by Microsoft.

How do I find my SQL server architecture?

Go to your SQL server.
Open up the Microsoft SQL Server Management Studio. Start->All programs->Microsoft SQL Server 2008 R2->SQL Server Management Studio.
Login with your user.
Click the New Query button.
Execute the following query. SELECT SERVERPROPERTY(‘edition’)

Does rebuilding indexes improve performance?

As you start to do inserts, index performance will actually improve for a time as the free-space pages are used, and then start to deteriorate as index fragmentation begins. Eventually the fragmentation in your index will be worse than it was after you completed your index rebuild, and performance can only get worse.

What is difference between Rebuild index and reorganize in SQL Server?

Rebuild : rebuild drops the existing index and recreates again. Reorganise : reorganize physically arrange the leaf nodes of the index.

What is a good fragmentation percentage?

There’s no hard and fast rule about how fragmented your drive should be before you defrag it. You might want to keep your fragmentation percentage under 5% or so, however, so that the defragmentation process doesn’t take too long to finish. 4. If you want to defragment your drive, click Optimize.

Can we add two columns in SQL?

Add multiple columns in table. You can use the ALTER TABLE statement in SQL Server to add multiple columns to a table.

How do you write a description of a table in SQL?

Open table designer. Select table using a right-click and choose “Design”. Then select a column you want to describe and go to Description field in the properties editor on the bottom of the screen.