Oracle认证考试1z0-883章节练习(2019.05.03)

单项选择题
You use—login-path to access a MySQL server on a Linux installation.Which statement is true about the – login-path option that is created by using mysql_config_editor?（）
A.All system users have access to the MySQL server via—login path local
B.login-path can be used only for MySQL servers running on a local machine
C.login-path allows you to provide login credentials without passing clear text passwords on the command line
D.When using – login-path to connect to a remote MySQL server, the remote server version must be 5.6 or later
多项选择题
Which three statements describe how the strict SQL mode provides added security?（）
A.It rejects statements that try to insert out-of-range values
B.It rejects invalid dates
C.It limits the operations that the server can perform
D.It rejects queries that produce out-of-range values
E.It rejects dates with zero day or month values
多项选择题
A MySQL replication slave is set up as follows: User all InnoDB tablesReceives ROW-based binary logs Has the read-only optionThe replication slave has been found in an error state.You check the MySQL error log file and find the following entries:2013-08-27 13:55:44 9056 [ERROR] Slave SQL: Could not execute Write_rows event on table test.tl; Duplicate entry ‘3’ for key’PRIMARY’ , Error_code: 1062; handler error HA_ERR_FOUND_DUPP_KEY; the event’s master log 56_master-bin.000003, end_log_pas 653, Error_code: 10622013-08-27 13:55:44 9056 [Warning] Salve: Duplicate entry ‘3’ for key ‘PRIMARY’Error_code: 10622013-08-27 13:55:44 9056 [ERROR] Error running query, slave SQL thread aborted. Fix theproblem, and restart the slave SQL thread with “SLAVE START”, We stopped at log ‘56_masterbin.000003’ position 496 What are two possible causes for this error to occur?（）
A.The slave was created with mysqldump –u root –p – skip-lock-table—all-databases > /data/data.sql
B.The slave user does have INSERT, UPDATE, or DELETE permission and cannot execute the write_rows function
C.For tables with UNIQUE keys, statement-based replication must be used maintain integrity
D.The root user on the slave has executed FLUSH LOGS, causing the relay-log to doublewrite
E.The applications have the SUPER privilege, which allows them to update rows
单项选择题
A database exists as a read-intensive server that is operating with query_cachek_type =DEMAND.The database is refreshed periodically, but the resultset size of the queries does not fluctuate.Note the following details about this environment: A web application uses a limited set of queries. The Query Cache hit rate is high.All resultsets fit into the Query Cache. All queries are configured to use the Query Cache successfully. The response times for queries have recently started to increase.The cause for this has correctly been identified as the increase in the number of concurrent users accessing the web service.Based solely on the information provided, what is the most likely cause for this slowdown at the database level?（）
A.The Query Cache is pruning queries due to an increased number of requests
B.Query_cache_min_res_unit has been exceeded, leading to an increased performance overhead due to additional memory block lookups
C.Mutex contention on the Query Cache is forcing the queries to take longer due to its singlethreaded nature
D.The average resultset of a query is increasing due to an increase in the number of users requiring SQL statement execution
单项选择题
You have enabled the Slow Query Log for a short period. When you process the Slow Query Log, you receive the following snip of output:Count: 100 Time=0 .22a (22s) Lock=0.00s (0s) Rows=0.0 (0),root[root] @localhost CREATE TABLE 't1' (id serial,id0 varchar(N) unique key,intcaoll INT (N) ,intco12 INT(N) ,intco13 INT(N) ,intco14 INT(N) ,intco15 INT(N) ,charcol1 VARVHAR(N) ,charcol2 VARCHAR(N) charcol3 VARCHAR (N) ,charcol4 VARVHAR(N) ,charcol5 VARCHAR(N) charcol6 VARCHAR (N) ,charcol7 VARVHAR(N) ,charcol8 VARCHAR(N) charcol9 VARCHAR (N) .charcol 10 VACHAR (N) )Count: 64000 Time-0.02s (1213s) Lock=0.00s (6s) Rows=1.0 (64000),root [root]@ localhost SELECT intocl1, intco12, intco13, intco14, intco15, intco16,intco17, intco18 ,intcol9, intcol10, charcol1, charcol2, charcol3, charcol4, charcol5, charcol6 ,charcol7, charcol8, charcol9, charcol10 FROM t1 WHERE id = 's' Count: 1 Time=0.02s (0s) Lock=0.00s (0s) Rows=1.0 (1)agent [agent] @localhost SELECT Select_priv, Repl_client_priv, Show_db_priv, Super_priv, Process_priv FROM mysql.user WHERE CONCAT (user, 's', host) = CURRENT_USER () Count: 48000 Time=0.02s (778s) Lock=0.00 (3s) Rows=1.0 (48000),root[root]@localhost SELECT intocl1,intcol2,intcol3, intcol4, intcol5, charcol1, charcol2, charcol3 ,charcol4, charcol5, charcol6, charcol7, charcol8, charcol9, charcol10 FROM t1 WHERE id = 's'You want to tune the query such that it provides the greatest overall time savings. Which query will accomplish this?（）
A.CHEATE TABLE 't1' (id serial, id0 varchar (N) unique key, intcol1 INT (N) ,intcol2 INT (N), intcol3 INT(N) ,intcol4 INT(N), intcol5 INT(N), charool1 VARCHAR (N) ,charcol2 VARCHAR (N), charcol3 VARCHAR(N), charcol4 VARCHAR(N), charcol5 VARCHAR (N) ,charcol6 VARCHAR (N), charcol7 VARCHAR(N), charcol8 VARCHAR(N), charcol9 VARCHAR (N) ,charcol10 VARCHAR (N)
B.SELECT intcol1, intcol2, intcol3, intcol4, intcol5, intcol6, intcol7, intcol8, intcol9, Intcol10, intcol11, intcol12, intcol13, intcol14, intcol15, intcol16, intcol17, intcol18, intcol19, charcol10 FROM t1 WHERE id = 's'
C.SELECT Select_priv, Repl_client_priv, Show_db_priv, Super_priv, Process_priv FROM mysql.user WHERE CONCAT (user,'s', host) = CURRENT_USER()
D.SELECT intcol1, intcol2, intcol3, intcol4, intcol5, charcol1, charcol2, charcol3, charcol4, charcol5, charcol6, charcol7, charcol8, charcol9, charcol10 FROM t1 WHERE id = 's'
多项选择题
Which three methods will show the storage engine for the Country table?（）
A.A
B.B
C.C
D.D
E.E
单项选择题
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?（）
A.MySQL requires correct file ownership while remaining secure
B.MySQL needs to be run as the root user, but file cannot be owned by it
C.MySQL cannot be run as the root user
多项选择题
The InnoDB engine has a feature known as clustered indexes.Which three statements are true about clustered indexes as used in InnoDB?（）
A.A primary key must exist for creation of a clustered index
B.A clustered index allows fulltext searching within InnoDB
C.The first unique index is always used as a clustered index and not a primary key
D.A clustered index provides direct access to a page containing row data
E.If no indexes exist, a hidden clustered index is generated based on row IDs
F.A primary key is used as a clustered index
G.A clustered index is a grouping of indexes from different tables into a global index for faster searching
单项选择题
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?（）
A.The snapshot size will continue to grow as changes to the volume are made
B.The snapshots take a significant amount of disk space as they are a duplicate copy of the data
C.The system can only support one snapshot per volume, and you need to remove it to be able to take your next backup
D.The system keeps a copy of changes in memory and can cause an out of memory event
单项选择题
You have a server that has very limited memory but has a very large table. You will use mysqldump to back up this table.Which option will ensure mysqldump will process a row at a time instead of buffering a set of rows?（）
A.— quick
B.— skip-buffer
C.— single-transaction
D.— tab