File Info
| Exam | MySQL 5.7 Database Administrator |
| Number | 1z0-888 |
| File Name | Oracle.1z0-888.ExamCollection.2020-02-07.74q.vcex |
| Size | 3 MB |
| Posted | Feb 07, 2020 |
| Download | Oracle.1z0-888.ExamCollection.2020-02-07.74q.vcex |
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Demo Questions
Question 1
Consider:
Which statement best describes the meaning of the value for the key_len column?
- It shows how many bytes will be used from each index row.
- It shows the number of characters indexed in the key.
- It shows the total size of the index row.
- It shows how many columns in the index are examined.
Correct answer: A
Question 2
A particular government’s security policy is to have very strict data encryption and safety settings. This is done by restricting access based on their own CA authority and limiting access to particular users within a department. Which method could be used to restrict access as required?
- using GRANT … REQUIRE X509 AND REQUIRE ISSUER ‘/C=…..’ AND REQUIRE SUBJECT ‘/C=…..’
- using GRANT USAGE, X509, …….ON *.* TO user@remotehost IDENTIFIED BY ‘secret_password’
- using GRANT … REQUIRE SSL for a secure connection
- using GRANT USAGE, SSL, …..ON *.* TO user@remotehost IDENTIFIED BY ‘secret_password’
Correct answer: A
Question 3
What does the possible_keys column in this output denote?
- if it is possible for you to include any indexes in your query
- whether there are any indexes on the tables that you are querying
- if there are any indexes that may be used to solve this query
- whether you are using any indexes in your query
Correct answer: A
Question 4
Is it true that binary backups always take less space than text backups?
- Yes, because binary backups only contain data, and not statements required to insert data into the tables.
- No, because text backups can have optimizations, which make them smaller, such as updating many rows at once.
- No, because if InnoDB tables contain many empty pages, they could take more space than the INSERT statements.
- Yes, because even if InnoDB tables contain many empty pages, text backups have empty INSERT statements for them.
Correct answer: C
Question 5
Which two options describe how MySQL Server allocates memory? (Choose two.)
- Each connection may have its own per-thread memory allocations.
- Thread memory is pre-allocated up to thread_cache_size for performance.
- Each thread allocates memory from a global pool.
- Global memory resources are allocated at server startup.
Correct answer: AD
Question 6
Which three are key advantages of standard MySQL replication? (Choose three.)
- supports native automatic failover
- enables automatic resync of databases when discrepancies are detected
- provides arbitrary geographic redundancy with minimal overhead to master
- synchronously guarantees identical slave copy
- is easy to configure and has low performance overhead
- can easily add slaves for read scaling
Correct answer: BEF
Question 7
You are contacted by a user who does not have permission to access a database table. You determine after investigation that this user should be permitted to have access and so you execute a GRANT statement to enable the user to access the table.
Which statement describes the activation of that access for the user?
- The access does not take effect until the user logs out and back in.
- The access does not take effect until the next time the server is started.
- The access is available immediately.
- The access does not take effect until you issue the FLUSH PRIVILEGES statement.
Correct answer: C
Question 8
You have a MySQL replication setup and you intentionally stop the SQL thread on the slave.
What are two reasons that you may stop the SQL thread on the slave while keeping the I/O thread running? (Choose two.)
- to allow the remaining events to be processed on the slave while not receiving new events from the master
- to allow a backup to be created under reduced load
- to allow for point-in-time recovery on the slave
- to prevent schema changes from propagating to the slave before they are validated
- to prevent any transaction experiencing a deadlock
Correct answer: BC
Question 9
Which two statements are true about InnoDB auto-increment locking? (Choose two.)
- InnoDB never uses table_level locks.
- InnoDB always protects auto-increment updates with a table-level lock
- InnoDB does not use locks to enforce auto-increment uniqueness.
- The auto-increment lock can be a table-level lock.
- Some settings for innodb_autoinc_lock_mode can help reduce locking.
Correct answer: DE
Question 10
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? (Choose two.)
- Set binlog_format=MIXED with the --replicate-ignore-temp-table option.
- Use the --replicate-do-db, --replicate-do-table, or --replicate-wild-do-table option with the value equal to OLD_INVENTORY.
- Change the binlog_format option to ROW and restart mysqld before you create the OLD_INVENTORY table.
- Stop SQL_THREAD on the slave until you have finished using the OLD_INVENTORY temporary table.
- Use the --replicate-ignore-table option with the value equal to OLD_INVENTORY.OLD_INVENTORY and restart mysqld before creating the temporary table.
Correct answer: BE
