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NEW QUESTION: 1
You administer a Microsoft SQL Server 2008 R2 database that contains an OrderItems table. The table has the following definition:

Data is grouped into quarterly partitions.
You need to configure the groupings into 12 monthly partitions.
What should you do?
A. Execute the DBCC CLEANTABLEcommand on the OrderItems table.
B. Use the ALTER PARTITION FUNCTION ... SPLIT RANGE statement.
C. Create a new partition function.
Create a new partition scheme.
Add a clustered index to place the data onto the partition scheme.
D. Run the following statement:
CREATE PARTITION SCHEME SEC_FG
AS PARTITION FUNC_FG
ALL TO (SECONDARY);
E. Create a new table.
Use the ALTER TABLE statement along with the SWITCH PARTITION clause.
Use the ALTER PARTITION FUNCTION statement along with the MERGE RANGE
clause.
F. Run the following statement:
EXECUTE sp_tableoption
@TableNamePattern ='OrderItem3',
@OptionName= 'PartltionByYear';
@OptionValue= 'true';
G. Use the ALTER TABLEstatement to remove the COLLATEoption.
H. Create a new filegroup.
Create a new database file.
Use the ALTER PARTITION SCHEME statement along with the NEXT USED clause.
Use ALTER INDEX REORGANIZE statement.
I. Remove the clustered index from the table.
J. Create a new Filegroup.
Create a new database File.
Use the ALTER PARTITION SCHEME statement along with the NEXT USED clause.
Use the ALTER PARTITION FUNCTION statement along with the SPLIT RANGE clause.
Answer: B

NEW QUESTION: 2

A. padding
B. trimming
C. salting
D. hashing
Answer: C,D
Explanation:
Explanation
There are two strategies that you can use to avoid hotspotting:
* Hashing keys
To spread write and insert activity across the cluster, you can randomize sequentially generated keys by hashing the keys, inverting the byte order. Note that these strategies come with trade-offs. Hashing keys, for example, makes table scans for key subranges inefficient, since the subrange is spread across the cluster.
* Salting keys
Instead of hashing the key, you can salt the key by prepending a few bytes of the hash of the key to the actual key.
Note. Salted Apache HBase tables with pre-split is a proven effective HBase solution to provide uniform workload distribution across RegionServers and prevent hot spots during bulk writes. In this design, a row key is made with a logical key plus salt at the beginning. One way of generating salt is by calculating n (number of regions) modulo on the hash code of the logical row key (date, etc).
Reference:
https://blog.cloudera.com/blog/2015/06/how-to-scan-salted-apache-hbase-tables-with-region-specific-key-ranges
http://maprdocs.mapr.com/51/MapR-DB/designing_row_keys_for_mapr_db_binary_tables.html

NEW QUESTION: 3
A call-back system requires that a user with an id and password call a remote server through a dial-up line, then the server disconnects and:
A. dials back to the user machine based on the user id and password using a telephone number from its database.
B. dials back to the user machine based on the user id and password using a telephone number provided by the user during this connection.
C. waits for a redial back from the user machine for reconfirmation and then verifies the user id and password using the sender's database.
D. waits for a redial back from the user machine for reconfirmation and then verifies the user id and password using its database.
Answer: A
Explanation:
A call-back system in a net centric environment would mean that a user with an id and password calls a remote server through a dial-up line first, and then the server disconnects and dials back to the user machine based on the user id and password using a telephone number from its database. Although the server can depend upon its own database, it cannot know the authenticity of the dialer when the user dials again. The server cannot depend upon the sender's database to dial back as the same could be manipulated.