A.There is no impact on performance
B.The overhead depends on the settings of the Performance Schema
C.There is an overhead for querying the Performance Schema but not for having it enabled
D.There is a constant overhead regardless of settings and workload
您可能感兴趣的试卷
你可能感兴趣的试题
A.The attribute "STATUS" is set to the string EXTERNAL_AUTH
B.The attribute "PRIV_USER" contains the username
C.The event type that is given in the attribute "NAME" is EXTERNAL_AUTH
D.There is no differentiation between native and external authentication events
E.External authentication is managed through external auditing logs
F.The "PROXY_PRIV" user shows a username if external authentication is used
Consider the Mysql Enterprise Audit plugin. The following event detail is found in the audit log:
Which two points can be concluded from the given event?()
A.A connection as the user kate was successful
B.A connection failed due to authentication being unsuccessful
C.A connection was attempted via socket rather than TCP
D.A connection was blocked by a firewall or a similar security mechanism
E.A connection failed because the proxy user privileges did not match the login user
A.It can support transactions
B.Table contents are not saved if the server is restarted
C.It cannot contain text or BLOB columns
D.It can support foreign keys
E.Each table is represented on disk as an.frm file
F.Each table has a corresponding.MYI and .MYD file
A.Mysql NDB Cluster
B.Mysql Replication
C.Distributed Replicated Block Device (DRBD) and Mysql
D.Windows Cluster and Mysql
E.Solaris Cluster and Mysql
Consider the query:
Mysql> SET @run = 15;
Mysql> EXPLAIN SELECT objective, stage, COUNT (stage)
FROM iteminformation
WHERE run=@run AND objective=’7.1’
GROUP BY objective,stage
ORDER BY stage;
The iteminformation table has the following indexes;
Mysql> SHOW INDEXES FROM iteminformation:
This query is run several times in an application with different values in the WHERE clause in a growing data set.
What is the primary improvement that can be made for this scenario?()
A.Do not pass a user variable in the WHERE clause because it limits the ability of the optimizer to use indexes
B.Add an index on the objective column so that is can be used in both the WHERE and GROUP BY operations
C.Drop the run_2 index because it has caused a conflict in the choice of key for this query
D.Execute the run_2 index because it has caused a conflict in the choice of key for this query
E.Add a composite index on (run,objective,stage) to allow the query to fully utilize an index
A.It prompts you to set the root user account password
B.It checks whether file permissions are appropriate within datadir
C.It asks to remove the test database, which is generated at installation time
D.It can delete any anonymous accounts
E.It verifies that all users are configuration with the longer password hash
A.Syntax when writing queries involving JOINS
B.Memory usage when working with the data
C.Character set mapping index hash size
D.Disk usage when storing data
You install a copy of Mysql 5.6.13 on a brand new Linux server by using RPM packages. The server starts successfully as verified by the following commands: $ pidof mysqld 3132
$tail – n2 /var/lib.mysql/hostname.err
2013-08-18 08:18:38 3132 [Note] /usr/sbin/mysqld:ready for connections. Version: '5.6.13-enterprise-commercial-advaced'
socket:'/tmp/mysql.sock' port; 3306 Mysql Enterprise Server – Advanced Edition (Commercial) You attempt to log in as the root user with the following command: $mysql – u root ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
Which statement is true about this scenario?()
A.The RPM installation script sets a default password of password for new installations
B.The local root user must log in with a blank password initially: mysql –u root –p
C.New security measures mean that the mysql_secure_installation script must be run first on all new installations
D.The mysql_install_bd post-installation script used – random-password
A.Creating, dropping, and modifying tables and indexes
B.Initiating a binary backup of the database by using the START BACKUP command
C.Displaying replication status information
D.Shutting down the server by using the SHUTDOWN command
E.Creating and dropping databases
F.Creating and administering users
最新试题
An employee cannot access the company database. You check the connection variables:What is a valid explanation for why one of the users is unable to connect to the database?()
Which three are properties of the MyISAM storage engine?()
Which three methods will show the storage engine for the Country table?()
Which three statements are true about memory buffer allocation by a MySQL Server?()
Which two capabilities are granted with the SUPER privilege?()
In a test database, you issue the SELECT … INTO OUTFILE statement to create a file with your t1 table data. You then TRUNCATE this table to empty it.()Mysql> SELECT * INTO OUTFILE '/tmp/t1.sql' from t1;mysql> TRUNCATE t1;
A user executes the statement;PURGE BINARY LOGS TO 'mysql-bin.010';What is the result?()
What are three facts about backups with mysqldump?()
You have taken a Logical Volume Manager (LVM) snapshot backup of a volume that contains the MySQL data directory. Why is it important to remove snapshots after completing a RAW backup in this way?()
MySQL is installed on a Linux server and has the following configuration:What is the purpose of changing ownership of datadir to the ‘mysql’ user?()