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Oracle MySQL 8.0 Database Administrator Sample Questions (Q30-Q35):

NEW QUESTION # 30
Which statement is true about InnoDB persistent index statistics?

A. Updating index statistics is an I/O expensive operation.
B. Increasing innodb_stats_persistent_sample_pages determines higher pages scanning speed, at the cost of increased memory usage.
C. Setting innodb_stats_auto_recalc=ON causes statistics to be updated automatically when a new index is created.
D. Index statistics are calculated from pages buffered in the buffer pool for tables with InnoDB storage engine.
E. Tables are scanned and index statistics recalculated when an instance is restarted.
F. Execution plans based on transient index statistics improve precision when innodb_stats_persistent_sample_pages is increased.

Answer: F

NEW QUESTION # 31
What is the correct syntax for using transparent data encryption with an existing InnoDB table?

A. ALTER TABLE t1 ENCRYPTION='Y';
B. ALTER TABLE t1 SET TDE = 'ON';
C. ALTER TABLE t1 ADD ENCRYPTED_TABLESPACE = 'Y';
D. ALTER TABLE t1 WITH ENCRYPTION USING MASTER KEY;

Answer: C

NEW QUESTION # 32
A user wants to connect without entering his or her username and password on the Linux command prompt.
Which three locations can be used to store the user's mysql credentials to satisfy this requirement? (Choose three.)

A. $MYSQL_HOME/my.cnf file
B. $HOME/.my.cnf file
C. $HOME/.mylogin.cnf file
D. $HOME/.mysql/auth/login file
E. DATADIR/mysqld-auto.cnf file
F. /etc/my.cnf file
G. $HOME/.mysqlrc file

Answer: A,E,F

NEW QUESTION # 33
You have upgraded the MySQL binaries from 5.7.28 to 8.0.18 by using an in-place upgrade.
Examine the message sequence generated during the first start of MySQL 8.0.18:

Which step or set of steps will resolve the errors?

A. Go to the <datadir>/mysql directory and execute: myisamchk --update-state columns_priv event proc proxies_priv tables_priv.
B. Start mysqld again using the --upgrade=FORCE option.
C. Remove the redo logs. Replace the MySQL binaries with the 5.7.28 binaries. Prepare the tables for upgrade. Upgrade to 8.0.18 again.
D. Execute: mysqlcheck --check-upgrade mysql columns_priv event proc proxies_priv tables_priv.
E. Execute: mysqlcheck --repair mysql columns_priv event proc proxies_priv tables_priv.

Answer: B

NEW QUESTION # 34
Your MySQL server was upgraded from an earlier major version.
The sales database contains three tables, one of which is the transactions table, which has 4 million rows.
You are running low on disk space on the datadir partition and begin to investigate.
Examine these commands and output:

Which two statements are true? (Choose two.)

A. Truncating the sales and leads table will free up disk space.
B. Executing ALTER TABLE transactions will enable you to free up disk space.
C. Executing SET GLOBAL innodb_row_format=COMPRESSED and then ALTER TABLE transactions will free up disk space.
D. Truncating the transactions table will free up the most disk space.
E. The transactions table was created with innodb_file_per_table=OFF.

Answer: C,E

NEW QUESTION # 35
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