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Q41. A user has deleted the wrong row in a table and you are preparing a point-in-time recovery skipping the DELETE event.
The server is configured with:
You have identified that the DELETE statement to skip has the Global Transaction Identifier (GTID) ‘dbbe7da-fe25-11e2-b6c7-0800274aa49e:5 and you replay the binary log with:
Mysqlbinlog – exclude-gtides=’ dbbe07da-fe25-11e2-b6c7-0800274aa49e:5’ binlog.00000.2 | mysql
However all events were skipped instead of just the one deleting the wrong row.
What is the reason for this?
A. Mysqlbinlog ignores arguments to – exclude-gtids-it means ignore all events with GTIDs.
B. The server keeps track of which GTIDs have already been executed and skips those.
C. Enforce_gtid_consistency is set to ON.
D. Gtid_mode must be set to AUTO during point in time recoveries.
Answer: B
Q42. You are having problems with connections from a specific host (192.168.1.15) not closing down correctly. You want to find the state of the threads from that host check for long-running queries.
Which statement will accomplish this?
A. SELECT * FROM INFORMATION_SCHEMA.PROCESSLIST WHERE HOST=’192.168.1.15’;
B. SELECT * FROM INFORMATION_SCHEMA.EVENTS WHERE HOST=’ 192.168.1.15’;
C. SELECT * FROM INFORMATION_SCHEMA.STATISTICS WHERE HOST=’ 192.168.1.15’;
D. SELECT * FROM INFORMATION_SCHEMA.INNODB_METEICS WHERE HOST=’ 192.168.1.15’;
Answer: C
Q43. Which two statements are true about InnoDB auto-increment locking?
A. The auto-increment lock can be a table-level lock.
B. InnoDB never uses table-level locks.
C. Some settings for innodb_autoinc_lock_mode can help reduce locking.
D. InnoDB always protects auto-increment updates with a table-level lock.
E. InnoDB does not use locks to enforce auto-increment uniqueness.
Answer: A
Reference: http://dev.mysql.com/doc/refman/5.6/en/innodb-auto-increment-
configurable.html
Q44. You want to create a temporary table named OLD_INVENTORY in the OLD_INVENTORY database on the master server. This table is not to be replicated to the slave server.
Which two changes would ensure that the temporary table does not propagate to the slave?
A. Use the – replicate-do-db, -- replicate-do-table, or – replicate-wild-do-table option with the value equal to OLD_INVENTORY.
B. Change the binlog_format option to ROW and restart mysqld before you create the OLD_INVENTORY table.
C. Stop SQL_THREAD on the slave until you have finished using the OLD_INVENTORY temporary table.
D. Set binlog_format=MIXED with the – replicate-ignore-temp-table option.
E. Use the – replicate-ignore-table option with the value equal to OLD_INENTORY.OLD_INVENTORY and restart mysqld before creating the temporary table.
Answer: A,D
Q45. 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?
A. Decrease the value of table_definition_cache.
B. Increase the value of table_definition_cache.
C. Decrease the value of table_open_cache.
D. Increase the value of table_open_cache.
E. Decrease the value of table_open_cache_instances.
F. Increase the value of table_open_cache_instances.
Answer: A,D
Q46. ROW-based replication has stopped working. You investigate the error log file and find the following entries:
2013-08-27 14:15:47 9056 [ERROR] Slave SQL: Could not execute Delete_rows event on table test.t1; Can’t find record in ‘t1’, Error_code: 1032; handler error
HA_ERR_KEY_NOT_FOUND; the event’s master log 56_master-bin. 000003, end_log_pos 851, Error_code: 1032
2013-08-27 14:15:47 9056 [warning] Slave: Can’t find record in ‘t1’ Error_code: 1032
2013-08-27 14:15:47 9056 [ERROR] Error running query, slave SQL thread aborted. Fix the problem, and restart the slave SQL thread with “SLAVE START”. We stopped at log ‘56_master-bin. 000003’ position 684
Why did you receive this error?
A. The slave SQL thread does not have DELETE privileges to execute on test.t1 table.s
B. The table definition on the slave -litters from the master.
C. Multi-threaded replication slaves can have temporary errors occurring for cross database updates.
D. The slave SQL thread attempted to remove a row from the test.t1 table, but the row did not exist.
Answer: D
Q47. 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 system can only support one snapshot per volume, and you need to remove it to be able to take your next backup.
B. The snapshot size will continue to grow as changes to the volume are made.
C. The snapshots take a significant amount of disk space as they are a duplicate copy of the data.
D. The system keeps a copy of changes in memory and can cause an out of memory event.
Answer: C
Q48. The following commands are available in the Linux binary distributions of Mysql:
Mysqld Mysqld_safe Mysql.server
What is the correct description of each of these commands?
A. Mysqld is the server.
Mysqld_safe is a shell script that invokes mysqld.
Mysql.server is a wrapper for mysql_safe.
B. Mysqld is a shell script that starts mysql.server.
Mysqld_safe causes the server to start up in data recovery mode.
Mysql.server is the server.
C. Mysqld is the server.
Mysqld_safe causes the server to start up in data recovery mode.
Mysql.server is a wrapper for mysqld_safe.
D. Mysql, mysqld.safe, and mysql.server reside in different locations but are all symlinked
to the same script.
Answer: B
Q49. Assume that you want to know which Mysql Server options were set to custom values. Which two methods would you use to find out?
A. Check the configuration files in the order in which they are read by the Mysql Server and compare them with default values.
B. Check the command-line options provided for the Mysql Server and compare them with default values.
C. Check the output of SHOW GLOBAL VARIABLES and compare it with default values.
D. Query the INFORMATION_SCHEMA.GLOBAL_VARIABLES table and compare the result with default values.
Answer: C
Q50. A general purpose MySQL instance is configured with the following options:
-- log-slow-queries -- long-query-time=,0001 -- log-slow-admin-queries -- general-log -- log-bin -- binlog-format=STATEMENT -- innodb-flush-log-at-trx-commit=1
Which three statements are true?
A. The General Query Log records more data than the Binary Log.
B. The binary Log records more data than the General Query Log.
C. The Slow Query Log records more data than the General Query Log.
D. The General Query Log records more data than the Slow Query Log.
E. The Slow Query Log records more data than the Binary Log.
F. The Binary Log records more data than the Slow Query Log.
Answer: A,D,E
