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QUESTION NO: 1
You are investigating the performance of the server and see this 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. Decrease the value of table_open_cache.
C. Decrease the value of table_open_cache instances.
D. Increase the value of table_open_cache_instances.
E. Increase the value of table_definition_cache.
F. Increase the value of table_open_cache.
Answer: D
QUESTION NO: 2
You are no longer able to log in to an existing MySQL Server because the root password credentials not working.
You need to reset the root password to complete various administrative tasks. What are the two major methods that will achieve this? (Choose two.)
A. Start the MySQL Server with -initialize-insecure to force a password reset procedure on the command line.
B. Start the MySQL Server in --safe-mode, which only loads the privilege system for changes as data is inaccessible.
C. Start the MySQL Server with reset-root-password in my.cnf, which will prompt you to enter a new root user password.
D. Start the MySQL Server with --skip-grant-tables and execute SQL, which will update the root password.
E. Start the MySQL Server with --init-file pointing to SQL that executes an ALTER USER statement to change the root user password.
Answer: D,E
QUESTION NO: 3
You are receiving complaints from your application administrators that they are seeing periodic stalls in database response (no queries to any table are returning results for several seconds or longer). You monitor your system and notice that the durations of those stalls correspond to peaks in disk I/O.
Which 2 things should you investigate?
A. Check the rate of change in the status value Aborted_connects and compare to the rate of change in Connections.
B. Check the rate of change in the statis value Qcache_hits and compare that to the rate of change of
Qcache_not_cached.
C. Check the difference between the InnoDB status values "Log Sequence number" and "Last
Checkpoint" positions then compare that to the total size of the redo log.
D. Check the difference between the InooDB status values "Trx id counter" and "Purge done for" and compare to the state substatus of the main "Main thread"
E. Check the rate of change in the status value Select_scan and compare to the rate of change in
Com_select.
Answer: B,C
QUESTION NO: 4
What is the order of tables shown in an EXPLAIN output?
A. It lists tables from the most optimized to the least optimized.
B. It lists tables in the order in which their data will be read.
C. It lists tables from the smallest to the largest.
D. It lists tables in the order in which they are specified in the statement that is being explained.
Answer: D
QUESTION NO: 5
Consider the CHECK TABLE command.
In which two situations should this command be used? (Choose two.)
A. to repair table structure problem
B. to make sure a table has no structural problems
C. to find out why a query takes a long time to execute on a given table
D. to improve performance by updating index distributing statistics on InnoDB tables
E. to make sure that no table indexes are corrupted
Answer: B,E
Explanation
The CHECK TABLE statement performs an integrity check on table structure and contents. It works for
MyISAM and InnoDB tables. For MyISAM tables, it also updates the index statistics. If the table is a view, CHECK TABLE verifies the view definition. If the output from CHECK TABLE indicates that a table has problems, the table should be repaired.
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Updated: May 28, 2022