Full Atomicity, Consistency, Isolation, Durability (ACID) compliance is a necessity for a new application, which heavily reads and writes data.
This requires the following config file options: Sync_binlog=1 Innodb_flush_log_at_trx_commit=1 Innodb_doublewrite=1 However, this configuration is expected to introduce disk I/O overhead.
What three changes will reduce disk I/O overheads?（）
A.Use of soft links for database directories on the same physical disk
B.Use of delay_key_write=ON for batch index update
C.Allocation of RAM to the buffer pool such that more of the data can fit in RAM
D.Placement of InnoDB log files and datadir on separate physical disks
E.Use of separate directories on the same physical disk for log files and data files
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Consider the following table:
Which method should used to add a new g201305 partition to the table?（）
A.A
B.B
C.C
D.D
E.E
A.File system snapshots
B.Mysqldumpslow
C.Mysqlhotcopy
D.Mysqldump with – binary-data option
E.Mysql Enterprise Backup
A.Shell＞ mysqladmin –u root –p shutdown
B.Shell＞ nmc mysql shutdown
C.Mysql＞ STOP PROCESS mysqld
D.Shell＞ /etc/init.d/mysql stop
E.Shell＞ service mysql safe_exit
F.Shell＞ pkill –u mysql mysqld_safe
G.Shell＞ net stop mysql
A.The master.info and relay.info files
B.The relay log files
C.The relay index file
D.Mysql.slave_master_info table
E.Mysql.slave_relay_log_info table
F.Mysql.slave_worker_info table
A.UPDATE pets…
B.SELECT….FROM pets
C.INSERT INTO pets…
D.ALTER TABLE pets…
A.STOP SLAVE; SET GLOBAL SQL_SLAVE_SKIP_COUNTER=1; START SLAVE
B.STOP SLAVE; BEGIN; SET GTID_IGNORE="aaa-bbb-ccc-ddd-eee: 3"; COMMIT; START SLAVE
C.STOP SLAVE; SETGTID_NEXT="aaa-bbb-ccc-ddd-eee: 3"; BEGIN; COMMIT; SET GTID_NEXT="AUTOMATIC"; START SLAVE
D.STOP SLAVE; RESET SLAVE; BEGIN; SKIP NEXT GTID; COMMIT; START SLAVE
A.Tables with BLOB and TEXT columns cannot be partitioned
B.Partitioning allows easier management of smaller data sets for certain queries
C.Partitioning allows different columns to be stored in separate files
D.The partitioning expression is an integer or function that returns an integer value or NULL value
E.Partitioning is only available for those storage engines that implements it natively
A.RAID 5
B.iSCSI
C.SAN (Storage Area Network)
D.NFS (Networked File System)
A Mysql instance is running on a dedicated server. Developers access the server from the same network subnet. Users access the database through an application that is running on a separate server in a DMZ.
Which two will optimize the security of this setup?（）
A.Disabling connections from named pipes or socket files (depending on the operating system of the server)
B.Enabling and using SSL for connections to the Mysql database
C.Installing Mysql on the application server, and running the database and application on the same server
D.Starting the server with – bind- address=0.0.0.0 specified
E.Running the server with – skip-networking specified
F.Limiting logins to originate from the application server or the server's subnet'
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
最新试题
Which two capabilities are granted with the SUPER privilege?（）
You are investigating the performance of the server and see the following information: Events_waits_summary_global_by_event_name in the performance schema shows that the wait/synch/mutex/sql/LOCK_table_cache event is dominating other wait events. The table_open_cache_overflows status variable is 0.Which action should be taken to remove the performance bottleneck described here?（）
Compare a typical Distributed Replicated Block Device (DRBD) with MySQL Standard Replication using master-slave replication. Which two statements are correct?（）
You need to dump the data from the master server and import it into a new slave server.Which mysqldump option can be used when dumping data from the master server in order to include the master server's binary log information?（）
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 statements are true about memory buffer allocation by a MySQL Server?（）
You examine the output of SHOW GLOBAL STATUS and notice that the value of Created_tmp_disk_tables is consistently increasing.Which two variables would likely fix this issue?（）
You need to replicate a table from a master to a slave. The master and slave copies of the table will have different number of columns.Which two conditions must be true?（）
What is true regarding InnoDB locking?（）
Your developers have created table to store some of their program's data.After examining the slow Query Log, you see that they are using the LIKE operator and SUBSTER () functions against a VARCHAR (10000) column quite often.An example of the start of one row of data: 'GREEN01020495888331993-12-10/2…'What should you do to improve the overall performance?（）