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NEW QUESTION: 1
You have a Microsoft SQL Server database that has a table named Sales. The table is used for retrieving data and is updated during non business hours.
You run the following Transact-SQL statement:
You analyze the execution plan for the statement. (Click the Exhibit button).
You need to add an index that optimizes performance.
How should you complete the Transact-SQL statement?
Answer:
Explanation:
Explanation
Box 1:
Specifying the order in which key values are stored in an index is useful when queries referencing the table have ORDER BY clauses that specify different directions for the key column or columns in that index. In these cases, the index can remove the need for a SORT operator in the query plan; therefore, this makes the query more efficient.
The Database Engine can move equally efficiently in either direction. An index defined as (RejectedQty DESC, ProductID ASC) can still be used for a query in which the sort direction of the columns in the ORDER BY clause are reversed. For example, a query with the ORDER BY clause ORDER BY RejectedQty ASC, ProductID DESC can use the index.
Box 2:
You can include nonkey columns in a nonclustered index to avoid exceeding the current index size limitations of a maximum of 16 key columns and a maximum index key size of 900 bytes. The Database Engine does not consider nonkey columns when calculating the number of index key columns or index key size.
References: https://technet.microsoft.com/en-us/library/jj835095(v=sql.110).aspx
NEW QUESTION: 2
Sie stellen eine neue Microsoft Azure SQL-Datenbankinstanz bereit, um eine Vielzahl mobiler Anwendungen und öffentlicher Websites zu unterstützen. Sie planen, einen neuen Sicherheitsprinzipal mit dem Namen Benutzer1 zu erstellen.
Der Principal muss Zugriff haben, um alle aktuellen und zukünftigen Objekte in einer Datenbank namens Reporting auswählen zu können. Die Aktivität und Authentifizierung des Datenbankbenutzers muss auf die Berichtsdatenbank beschränkt sein.
Sie müssen das neue Sicherheitsprinzip erstellen.
Welche drei Aktionen sollten Sie nacheinander ausführen? Verschieben Sie zum Beantworten die entsprechenden Aktionen aus der Liste der Aktionen in den Antwortbereich und ordnen Sie sie in der richtigen Reihenfolge an.
Answer:
Explanation:
Erläuterung
Schritt 1, Schritt 2:
Zuerst müssen Sie eine Anmeldung für SQL Azure erstellen. Die Syntax lautet wie folgt:
CREATE LOGIN Benutzername WITH Passwort = 'Passwort';
Dieser Befehl muss in der Master-Datenbank ausgeführt werden. Erst danach können Sie Befehle ausführen, um einen Benutzer in der Datenbank zu erstellen.
Schritt 3:
Benutzer werden pro Datenbank erstellt und mit Anmeldungen verknüpft. Sie müssen mit der Datenbank verbunden sein, in der Sie den Benutzer erstellen möchten. In den meisten Fällen ist dies nicht die Masterdatenbank. Hier ist ein Beispiel für Transact-SQL, mit dem ein Benutzer erstellt wird:
BENUTZER ERSTELLEN readonlyuser FROM LOGIN readonlylogin;
Referenzen: https://azure.microsoft.com/de-de/blog/adding-users-to-your-sql-azure-database/
NEW QUESTION: 3
Once the route pattern has been designated for ARS, what is the next step?
A. Choose the network
B. Choose the AAR
C. Choose the FAC
D. Choose the trunk group
Answer: D
NEW QUESTION: 4
Overview
General Overview
ADatum Corporation has offices in Miami and Montreal.
The network contains a single Active Directory forest named adatum.com. The offices connect to each other by using a WAN link that has 5-ms latency. A Datum standardizes its database platform by using SQL Server 2014 Enterprise edition.
Databases
Each office contains databases named Sales, Inventory, Customers, Products, Personnel, and Dev.
Servers and databases are managed by a team of database administrators. Currently, all of the database administrators have the same level of permissions on all of the servers and all of the databases.
The Customers database contains two tables named Customers and Classifications.
The following graphic shows the relevant portions of the tables:
The following table shows the current data in the Classifications table:
The Inventory database is updated frequently.
The database is often used for reporting.
A full backup of the database currently takes three hours to complete.
Stored Procedures
A stored procedure named USP_1 generates millions of rows of data for multiple reports. USP_1 combines data from five different tables from the Sales and Customers databases in a table named Table1.
After Table1 is created, the reporting process reads data from Table1 sequentially several times. After the process is complete, Table1 is deleted.
A stored procedure named USP_2 is used to generate a product list. The product list contains the names of products grouped by category.
USP_2 takes several minutes to run due to locks on the tables the procedure accesses. The locks are caused by USP_1 and USP_3.
A stored procedure named USP_3 is used to update prices. USP_3 is composed of several UPDATE statements called in sequence from within a transaction.
Currently, if one of the UPDATE statements fails, the stored procedure fails. A stored procedure named USP_4 calls stored procedures in the Sales, Customers, and Inventory databases.
The nested stored procedures read tables from the Sales, Customers, and Inventory databases. USP_4 uses an EXECUTE AS clause.
All nested stored procedures handle errors by using structured exception handling. A stored procedure named USP_5 calls several stored procedures in the same database. Security checks are performed each time USP_5 calls a stored procedure.
You suspect that the security checks are slowing down the performance of USP_5. All stored procedures accessed by user applications call nested stored procedures.
The nested stored procedures are never called directly.
Design Requirements
Data Recovery
You must be able to recover data from the Inventory database if a storage failure occurs. You have a Recovery Time Objective (RTO) of 5 minutes.
You must be able to recover data from the Dev database if data is lost accidentally. You have a Recovery Point Objective (RPO) of one day.
Classification Changes
You plan to change the way customers are classified. The new classifications will have four levels based on the number of orders. Classifications may be removed or added in the future. Management requests that historical data be maintained for the previous classifications. Security A group of junior database administrators must be able to manage security for the Sales database. The junior database administrators will not have any other administrative rights. A Datum wants to track which users run each stored procedure.
Storage
ADatum has limited storage. Whenever possible, all storage space should be minimized for all databases and all backups.
Error Handling
There is currently no error handling code in any stored procedure.
You plan to log errors in called stored procedures and nested stored procedures. Nested stored procedures are never called directly.
You need to recommend a solution to minimize the amount of time it takes to execute USP_5. What should you include in the recommendation?
A. Use the EXECUTE AS clause in USP_5.
B. Enable cross-database chaining.
C. Copy USP.5 to each database.
D. Use a server role to group all logins.
Answer: B
Explanation:
Explanation/Reference:
Explanation:
Scenario:
A stored procedure named USP_5 changes data in multiple databases. Security checks are performed each time USP_5 accesses a database.
- Cross-database ownership chaining occurs when a procedure in one database depends on objects in another database. A cross-database ownership chain works in the same way as ownership chaining within a single database, except that an unbroken ownership chain requires that all the object owners are mapped to the same login account. If the source object in the source database and the target objects in the target databases are owned by the same login account, SQL Server does not check permissions on the target objects.