Contents
How would you modify existing database?
Key Points
- Use CREATE and DROP to create and delete tables.
- Use INSERT to add data.
- Use UPDATE to modify existing data.
- Use DELETE to remove data.
- It is simpler and safer to modify data when every record has a unique primary key.
- Do not create dangling references by deleting records that other records refer to.
Can we alter a database?
The ALTER DATABASE Statement is used to change characteristics of a database. After creating a database, we can change its properties by executing ALTER DATABASE statement. The user should have admin privileges for modifying a database.
What is the scope of cross database ownership chaining?
Ownership chaining is a security feature in SQL Server that enables the management of access to multiple objects by setting permissions on one object. In cross-database chaining, SQL Server can be configured to allow the same thing between databases or across all databases inside one instance of SQL server.
What is the use of alter in database?
The alter command is used when we want to modify a database or any object contained in the database. The drop command is used to delete databases from MySQL server or objects within a database. The rename command is used to change the name of a table to a new table name.
How do I enable cross-database ownership chaining?
You can set cross-database ownership chaining for individual databases using the SET clause of the ALTER DATABASE statement. If you are creating a new database, you can set the cross-database ownership chaining option for the new database using the CREATE DATABASE statement.
What is cross-database query?
Spark SQL Queries can access multiple tables simultaneously in such a way that multiple rows of each table are being processed at the same time. The tables could be located in the same or different databases.
How to change the scope of a database?
To change the database-scoped properties using ALTER DATABASE SCOPED CONFIGURATION Connect to a database in your SQL Server instance. From the Standard bar, click New Query. Copy and paste the following example into the query window. The following example sets MAXDOP for a secondary database to the value for the primary database.
How to override database scoped configuration in SQL Server?
Query hints can still override the database scoped MAXDOP in order to tune specific queries that need different setting. All these settings are limited by the MAXDOP set for the Workload Group. You can use the MAXDOP option to limit the number of processors to use in parallel plan execution.
How to view or change the properties of a database?
This topic describes how to view or change the properties of a database in SQL Server by using SQL Server Management Studio or Transact-SQL. After you change a database property, the modification takes effect immediately.
How to check the state of a database?
Database States. A database is always in one specific state. For example, these states include ONLINE, OFFLINE, or SUSPECT. To verify the current state of a database, select the state_desc column in the sys.databases catalog view or the Status property in the DATABASEPROPERTYEX function.