A.UPDATE pets…
B.SELECT….FROM pets
C.INSERT INTO pets…
D.ALTER TABLE pets…
您可能感兴趣的试卷
你可能感兴趣的试题
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
A.Execution of the FLUSH LOGS statement
B.Starting of the SQL thread
C.Reaching the slave_pendign _jobs_size_max limit
D.Execution of FULSH TABLES WITH READ LOCK
E.Starting of the I/O thread
You want to start monitoring statistics on the distribution of storage engines that are being used and the average sizes of tables in the various databases.
Some details are as follows:
The Mysql instance has 400 databases. Each database on an average consists of 25-50 tables. You use the query:
SELECT TABLE_SCHEMA, 'ENGINE', COUNT (*), SUM(data_length) total_size FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE= 'BASE TABLE' GROUP BY TABLE_SCHEMA, 'ENGINE' ;
Why is this query slow to execute?（）
A.Collecting information requires large numbers of locks on various INFORMATION_SCHEMA tables
B.Aggregating details from various storage engine caches for the final output is time consuming
C.Collecting information requires various disk-level operations and is time consuming
D.Counting and summarizing all table pages in the InnoDB shared tablespace is time consuming
A.Always stop the server prior to the backup
B.Stop the server or lock the tables prior to the backup
C.Stop the server or lock the databases prior to the backup
D.Make a copy of the .frm, .myd, and the .myi files
E.Make a copy of the binary log and tablespace files
A.It requires the RELOAD, FILE, and DROP privileges
B.It closes and reopens all log files
C.It closes and sends binary log files to slave servers
D.It flushes dirty pages in the buffer pool to the REDO logs
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
最新试题
Which three methods will show the storage engine for the Country table?（）
Which three data components are needed for point-in-time recovery?（）
Consider the following:Which statement best describes the meaning of the value for the key_len column?（）
Consider the MySQL Enterprise Audit plugin, You add the following lines to the my.cnf configuration tile: [mysqld] Plugin-load=audit_log.so Audit-log=FORCE_PLUS_PERMANENT You attempt to start up the MySQL service and notice that it fails to start.Which two statements would explain why the service did not start?（）
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?（）
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?（）
Compare a typical Distributed Replicated Block Device (DRBD) with MySQL Standard Replication using master-slave replication. Which two statements are correct?（）
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;
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?（）
What are three facts about backups with mysqldump?（）