Get 100% Passing Success With True 1Z0-888 Exam! [Aug-2021]
Oracle 1Z0-888 PDF Questions - Exceptional Practice To MySQL 5.7 Database Administrator
NEW QUESTION 13
Which statement is true about using Microsoft Windows Cluster as a platform for MySQL?
- A. It is a shared-nothing architecture.
- B. It is provided by means of IP-level disk replication.
- C. It relies on the shared disk architecture being visible to both servers.
- D. It implements High Availability by using the NET Connector's load balancing capabilities.
Answer: C
NEW QUESTION 14
Which two statements are true regarding the creating of new MySQL physical and logical backups?
- A. Physical backups are usually faster than text backups.
- B. Logical backups are human-readable whereas physical backups are not.
- C. Logical backups are always larger than physical backups.
- D. Physical backups are usually slower than text backups.
- E. Physical backups can be used to recover from data corruption.
Answer: A,E
NEW QUESTION 15
After analysis on the slow query log on a high-end OLTP service, the table identified in the slow queries is:
What are the two most likely reasons for the slowness given this output?
- A. No indexes are defined.
- B. The User field is too long for most names.
- C. Using default values for DATETIME causes table scans.
- D. Date should be a TIMESTAMP field for better performance.
- E. The engine type is not appropriate to the application use.
Answer: A,E
NEW QUESTION 16
You inherited a busy InnoDB OLTP Instance with 100 schemas and 100 active users per schema.
* Total dataset size is 200G with an average schema size of 2G.
* The data is transient and is not backed up and can be repopulated easily.
* Performance and responsiveness of the DB is paramount.
* The query pattern for the DB instance is split 90/10 read/write.
* DB host is dedicated server with 256G RAM and 64 cores.
One of your colleagues made some recent changes to the system and users are now complaining of performance impacts.
Which four configuration file edits might your colleague have performed to cause the negative DB performance?
- A. max_heap_table_size = 2G
tmp_table_size=2G - B. query_cache_size = 2G
query_cache_enabled=1 - C. log_bin=mysql -bin
Innodb_flush_log_at_trx_commit=1 - D. sync_binlog=10
- E. table_open_cache = 64
- F. innodb_flush_log_at_trx_commit=0
- G. innodb_flush_method=O_DIRECT
- H. innodb_buffer_pool_instances=64
innodb_buffer_pool_size=200G
Answer: B,E,G,H
NEW QUESTION 17
You have installed MySQL Server for the first time on your system. However, the data directory along with the tables in the mysqlsystem database are missing. Which step do you perform to create the contents of the data directory?
- A. Run the mysql_unpack.sqlfile
- B. Run the create_system_tables.sqlfile
- C. Invoke mysqldwith the --initializeoption.
- D. Invoke mysqlwith the --initializeoption.
Answer: C
Explanation:
Explanation/Reference:
Reference: https://dev.mysql.com/doc/refman/5.7/en/data-directory-initialization-mysqld.html
NEW QUESTION 18
You have a server that has very limited memory but has a very large table.
You will use mysqldump to back up this table.
Which option will ensure mysqldump will process a row at a time instead of buffering a set of rows?
- A. --quick
- B. --tab
- C. --single-transaction
- D. --skip-buffer
Answer: A
Explanation:
Reference: http://dev.mysql.com/doc/refman/4.1/en/mysqldump.html
NEW QUESTION 19
Consider the table people with the definition:
The application uses a query such as:
SELECT * FROM people WHERE YEAR(Birthday) = 1980;
The query is not using an index.
Which two methods can be used to allow the query to use an index?
- A. Execute ANALYZE TABLE to update the index statistics.
- B. Add a functional index for YEAR(Birthday).
- C. Add FORCE INDEX (Birthday) to the query.
- D. Change the WHERE clause to Birthday BETWEEN 1980-01-01 AND 1980-12-31.
- E. Add a generated column calculating YEAR(Birthday) and index that column.
Answer: C,D
NEW QUESTION 20
Consider these global status variables:
Which two conclusions can be made from the output?
- A. The thread cache has been configured with thread_cache_sizeset to at least 6.
- B. There are 510 connections to MySQL at the time of the output.
- C. All max_connectionswere in use at 2018-03-22 14:54:06
- D. There are 140 Performance Schema threads at the time of the output.
- E. There are more connections being idle than executing queries.
Answer: B,E
NEW QUESTION 21
You inherited a busy InnoDB OLTP Instance with 100 schemas and 100 active users per schema.
Total dataset size is 200G with an average schema size of 2G.
The data is transient and is not backed up and can be repopulated easily.
Performance and responsiveness of the DB is paramount.
The query pattern for the DB instance is split 90/10 read/write.
DB host is dedicated server with 256G RAM and 64 cores.
One of your colleagues made some recent changes to the system and users are now complaining of performance impacts.
Which four configuration file edits might your colleague have performed to cause the negative DB performance? (Choose four.)
- A. max_heap_table_size = 2G
tmp_table_size=2G - B. query_cache_size = 2G
query_cache_enabled=1 - C. log_bin=mysql -bin
Innodb_flush_log_at_trx_commit=1 - D. sync_binlog=10
- E. table_open_cache = 64
- F. innodb_flush_log_at_trx_commit=0
- G. innodb_flush_method=O_DIRECT
- H. innodb_buffer_pool_instances=64
innodb_buffer_pool_size=200G
Answer: B,E,G,H
NEW QUESTION 22
What two statements are true regarding FLUSH TABLES FOR EXPORT? (Choose two.)
- A. Partitioned tables are not supported.
- B. It is the safest way to extract tables from the shared tablespace.
- C. Table only exports when the table has its own tablespace.
- D. It can be used to export TEMPORARY tables.
- E. The InnoDB Storage engine must be used for the table being exported.
Answer: C,D
NEW QUESTION 23
After analysis on the slow query log on a high-end OLTP service, the table identified in the slow queries is:
What are the two most likely reasons for the slowness given this output?
- A. No indexes are defined.
- B. The User field is too long for most names.
- C. Using default values for DATETIME causes table scans.
- D. Date should be a TIMESTAMP field for better performance.
- E. The engine type is not appropriate to the application use.
Answer: A,E
NEW QUESTION 24
Which three are key advantages of standard MySQL replication?
- A. supports native automatic failover
- B. provides arbitrary geographic redundancy with minimal overhead to master
- C. can easily add slaves for read scaling
- D. enables automatic resync of databases when discrepancies are detected
- E. synchronously guarantees identical slave copy
- F. is easy to configure and has low performance overhead
Answer: C,D,F
NEW QUESTION 25
Host slave1 has ip address 192.0.2.10.
Host slave2 has ip address 203.0.113.50
Examine these commands:
Why did this error occur?
- A. The .mylogin.cnf file is not readable.
- B. There is no password defined in the login path.
- C. The DNS is not configured correctly for slave1 host.
- D. The mysqld instance has not been restarted after creating the login path.
- E. The host on the command line is not defined in the login path.
Answer: A
NEW QUESTION 26
A MySQL Server has been running an existing application successfully for six months. The my.cnf is adjusted to contain this additional configuration:
The MySQL Server is restarted without error.
What effect will the new configuration have on existing account?
- A. They all connect via the secure sha256_password algorithm without any configuration change.
- B. They are not affected by this configuration change.
- C. They will have to change their password the next time they login to the server.
- D. They will have their passwords updated on start-up to sha256_password format.
Answer: B
NEW QUESTION 27
Consider the index information for the dept_emp table in the employee's schema:
Which two conclusions can be made based on the output of the query?
- A. There is a redundant index on the dept_no column.
- B. The values on the emp_no column must be unique.
- C. There are three indexes on the table.
- D. The secondary indexes are optimized for unique key look-ups.
- E. The selectivity of the dept_no column is the best of the indexed columns.
- F. There is a redundant index on the emp_no column.
Answer: D,F
NEW QUESTION 28
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