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Question 1:

Which MySQL utility program should you use to process and sort the Slow Query Log based on query time or average query time?

A. mysqldumpslow

B. mysqldump

C. MySQL access

D. MySQL show

E. MySQL slow

Correct Answer: A


Question 2:

Consider: Which statement best describes the meaning of the value for the key_len column?

1Z0-888 free questions 2

A. It shows how many bytes will be used from each index row.

B. It shows the number of characters indexed in the key.

C. It shows the total size of the index row.

D. It shows how many columns in the index are examined.

Correct Answer: A


Question 3:

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?

A. using GRANT … REQUIRE X509 AND REQUIRE ISSUER `/C=…..\’ AND REQUIRE SUBJECT `/C=…..\’

B. using GRANT USAGE, X509, …….ON *.* TO user@remotehost IDENTIFIED BY `secret_password\’

C. using GRANT … REQUIRE SSL for a secure connection

D. using GRANT USAGE, SSL, …..ON *.* TO user@remotehost IDENTIFIED BY `secret_password\’

Correct Answer: A


Question 4:

1Z0-888 free questions 4

What does the possible_keys column in this output denote?

A. if it is possible for you to include any indexes in your query

B. whether there are any indexes on the tables that you are querying

C. if there are any indexes that may be used to solve this query

D. whether you are using any indexes in your query

Correct Answer: A


Question 5:

You have a consistent InnoDB backup created with mysqldump, the largest table is 50 GB in size.

You start to restore your backup with this command; shell> MySQL –u root –p < backup.sql

After 30 minutes, you notice that the rate of restoration seems to have slowed down. No other processes or external factors are affecting server performance.

Which is the most likely explanation for this slowdown?

A. The MySQL server has stopped inserting data to check index consistency.

B. InnoDB is doing CRC32 checks over the tablespace data as it grows.

C. The MySQL server is taking a periodical snapshot of data so it can resume the restore if it is interrupted mid-way.

D. InnoDB has filled the redo log and now must flush the pages.

E. Secondary indexes no longer fit into the buffer pool.

Correct Answer: A


Question 6:

Which two options describe how MySQL Server allocates memory? (Choose two.)

A. Each connection may have its own per-thread memory allocations.

B. Thread memory is pre-allocated up to thread_cache_size for performance.

C. Each thread allocates memory from a global pool.

D. Global memory resources are allocated at server startup.

Correct Answer: AD


Question 7:

Which three are the key advantages of standard MySQL replication? (Choose three.)

A. supports native automatic failover

B. enables automatic resync of databases when discrepancies are detected

C. provides arbitrary geographic redundancy with minimal overhead to master

D. synchronously guarantees identical slave copy

E. is easy to configure and has low-performance overhead

F. can easily add slaves for read scaling

Correct Answer: BEF


Question 8:

You are contacted by a user who does not have permission to access a database table. You determine after an 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?

A. The access does not take effect until the user logs out and back in.

B. The access does not take effect until the next time the server is started.

C. access is available immediately.

D. The access does not take effect until you issue the FLUSH PRIVILEGES statement.

Correct Answer: C


Question 9:

You have a MySQL replication setup and you intentionally stop the SQL thread on the slave.

1Z0-888 free questions 9

What are two reasons that you may stop the SQL thread on the slave while keeping the I/O thread running? (Choose two.)

A. to allow the remaining events to be processed on the slave while not receiving new events from the master

B. to allow a backup to be created under a reduced load

C. to allow for point-in-time recovery on the slave

D. to prevent schema changes from propagating to the slave before they are validated

E. to prevent any transaction from experiencing a deadlock

Correct Answer: BC


Question 10:

Which two methods accurately monitor the size of your total database size over time? (Choose two.)

A. monitoring the Innodb_rows_inserted status variable

B. monitoring the innodb_redo_log_size variable

C. monitoring the information_schema.TABLES table

D. monitoring data-dir size in the operating system

E. monitoring cumulative Innodb_page_size increase

F. monitoring the performance_schema_hosts_size variable

Correct Answer: CF


Question 11:

Consider the index information for the dept_emp table in the employee\’s schema:

1Z0-888 free questions 11

Which two conclusions can be made based on the output of the query? (Choose two.)

A. There are three indexes in the table.

B. There is a redundant index on the dept_no column.

C. The secondary indexes are optimized for unique key lookups.

D. The values on the emp_no column must be unique.

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.

Correct Answer: CF


Question 12:

Which two statements are true about InnoDB auto-increment locking? (Choose two.)

A. InnoDB never uses table-level locks.

B. InnoDB always protects auto-increment updates with a table-level lock

C. InnoDB does not use locks to enforce auto-increment uniqueness.

D. The auto-increment lock can be a table-level lock.

E. Some settings for innodb_autoinc_lock_mode can help reduce locking.

Correct Answer: DE


Question 13:

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 on the slave server.

Which two changes would ensure that the temporary table does not propagate to the slave? (Choose two.)

A. Set binlog_format=MIXED with the –replicate-ignore-temp-table option.

B. Use the –replicate-do-db, –replicate-do-table, or –replicate-wild-do-table option with the value equal to OLD_INVENTORY.

C. Change the binlog_format option to ROW and restart myself before you create the OLD_INVENTORY table.

D. Stop SQL_THREAD on the slave until you have finished using the OLD_INVENTORY temporary table.

E. Use the –replicate-ignore-table option with the value equal to OLD_INVENTORY.OLD_INVENTORY and restart me before creating the temporary table.

Correct Answer: BE


Question 14:

Which three allocate memory per thread in MySQL? (Choose three.)

A. query cache

B. thread cache

C. read buffer

D. internal temporary table

E. sort buffer

F. InnoDB buffer pool instance

Correct Answer: CEF

Reference: https://dev.mysql.com/doc/refman/5.6/en/memory-use.html


Question 15:

Suppose you are adding rows to a MyISAM table and the –data-dir location runs out of disk space. What will happen when this occurs?

A. The server will crash.

B. The server suspends that INSERT operation until space becomes available.

C. An error message will be returned to the client. Server Error: ER_IO

D. The server suspends operations for all storage engines until space becomes available.

Correct Answer: B


 

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Question 1:

Which statement about CDB architecture is true?

A. Oracle-supplied metadata resides only in the root container.

B. A seed PDB can sometimes be opened for particular operations.

C. Multiple PDBs with the same name can reside in the same CDB.

D. A CDB can have an infinite number of PDBs.

E. You can create common users in PDBs.

Correct Answer: A

Reference: http://docs.oracle.com/cd/E16655_01/server.121/e17633/cdbovrvw.htm#CNCPT89235


Question 2:

As part of your Oracle Database 12c post-installation tasks, you run these commands:

Cd $ORACLE_HOME/bin srvctl stop database -d myDb chopt enable dm srvctl start database -d my

What does this do?

A. It enables the Oracle Data Mining option in your Oracle binary files.

B. It creates the Fast Recovery Area disk group.

C. It generates a Client Static Library.

D. It configures one of the Oracle user accounts.

E. It configures Oracle Net Services.

F. It configures Oracle Messaging Gateway.

Correct Answer: A

Reference: http://docs.oracle.com/cd/E16655_01/install.121/e17889/postinst.htm#RILIN1049 (see 4.4)


Question 3:

Which two statements are true about shared server sessions?

A. No Program Global Area (PGA) is allocated for shared server processes.

B. User Global Area is stored in System Global Area (SGA).

C. Shared SQL Area is allocated from Program Global Area (PGA).

D. Private SQL Area is allocated from Library Cache.

E. Large Pool is used for SQL work areas.

Correct Answer: AD

A: The PGA is memory specific to an operating process or thread that is not shared by other processes or threads on the system. Because the PGA is process-specific, it is never allocated in the SGA.

The PGA is a memory heap that contains session-dependent variables required by a dedicated or shared server process. The server process allocates memory structures that it requires in the PGA.

D: The library cache is a shared pool memory structure that stores executable SQL and PL/SQL code. This cache contains the shared SQL and PL/SQL areas and control structures such as locks and library cache handles. In a shared server architecture, the library cache also contains private SQL areas.

Incorrect:

Not B: The SGA is a read/write memory area that, along with the Oracle background processes, form a

database instance. All server processes that execute on behalf of users can read the information in the instance SGA. Several processes write to the SGA during database operation.

Not C: A private SQL area (PGA) holds information about a parsed SQL statement and other session-specific information for processing. When a server process executes SQL or PL/SQL code, the process uses the private SQL area to store bind variable values, query execution state information, and query execution work areas.

Reference: Oracle Database Concepts, 12c, Memory Architecture


Question 4:

Which targets can be managed by using Enterprise Manager Cloud Control?

A. Hosts and databases

B. Hosts, databases, and application servers

C. Application servers and web applications

D. Databases, Oracle Management Server (OMS), and Oracle Management Repository (OMR)

E. Databases, application servers, and web applications

F. Hosts, databases, application servers, web applications, OMS, and OMR

Correct Answer: A

Reference: http://www.oracle.com/technetwork/oem/framework-infra/wp-em12c-security-best- practicesv21493383.pdf (page 3, second bulleted point, last couple of sentences)


Question 5:

Which two statements are true regarding SQL*Plus?

A. It has commands for performing database administration operations.

B. It can be used in interactive but not batch mode for SQL commands.

C. It has to be installed separately after the Oracle Database 12c installation.

D. Operating system commands can be executed from the SQL*Plus command prompt.

Correct Answer: AC

C: how to start SQL*Plus:

1- Make sure that SQL*Plus has been installed on your computer.

2. Log on to the operating system (if required).

3. Enter the command, SQLPLUS, and press Return.

Etc.

Not B: In the SQL*Plus command line, the use of an external editor in combination with the @, @@, or START commands is an effective method of creating and executing generic scripts. You can write scripts that contain SQL*Plus, SQL, and PL/SQL commands, which you can retrieve and edit. This is especially useful for storing complex commands or frequently used reports.

Reference: http://docs.oracle.com/cd/B14117_01/server.101/b12170/qstart.htm


Question 6:

Which two statements about the Process Monitor (PMON) process are true?

A. PMON performs process recovery when a client process fails.

B. During instance startup, PMON takes care of instance recovery.

C. PMON performs listener registration.

D. PMON restarts background and dispatcher processes when they fail.

E. PMON resolves failures of distributed transactions.

Correct Answer: AC


Question 7:

Which statement is true about loading data by using the conventional path of SQL*Loader?

A. Redo is not generated while performing conventional path loads.

B. Only PRIMARY KEY, UNIQUE KEY, and NOT NULL constraints are checked,

C. No exclusive locks are acquired when the conventional path loads are performed.

D. Instead of performing transactions, SQL*Loader directly writes data blocks to the data files.

E. INSERT triggers are disabled before the conventional path load and re-enabled at the end of the load.

Correct Answer: B

Reference: http://docs.oracle.com/cd/A57673_01/DOC/server/doc/SUT73/ch8.htm#data %20paths (see direct loads, integrity constraints, and triggers)


Question 8:

Identify three key properties of a transaction in Oracle Database 12c.

A. durability

B. consistency

C. concurrency

D. isolation

E. scalability

F. manageability

Correct Answer: ABD

Reference: http://docs.oracle.com/cd/E16655_01/server.121/e17633/transact.htm#CNCPT016


Question 9:

Which type of file system is NOT valid for storing data files, online redo log files, and control files for a pluggable database?

A. Automatic Storage Management (ASM)

B. OS file system

C. logical volume (LVM)

D. clustered file system

E. RAW

Correct Answer: E


Question 10:

Which two statements about ADDM are true?

A. Real-Time ADDM uses AWR snapshots of the last 10 minutes.

B. Real-Time ADDM uses ASH’s recent activity from SGA data.

C. Real-Time ADDM analyzes performance in a completely different fashion than regular ADDM.

D. Regular ADDM uses AWR snapshots that are not yet purged.

Correct Answer: CD

C: Real-Time ADDM provides an innovative way to analyze problems in unresponsive or hung databases. Using a normal and a diagnostic mode connection Real-Time ADDM runs through a set of predefined criteria to analyze the current performance and helps the DBA to resolve deadlocks, hangs, shared pool contentions, and many other exceptional situations that today force the administrator to bounce their databases, causing significant loss of revenue. ‘

Real-Time ADDM is the only tool available in the market today that can log into a hung database, analyze the problem and recommend a resolution

Note: Real-Time ADDM is an innovative way to analyze problems in extremely slow or unresponsive databases, which would have traditionally required a database restart. Real-Time ADDM can help resolve issues such as deadlocks, hangs, and shared pool contentions, as well as many other exceptional situations, without resorting to a restart of the database.

D: ADDM builds upon the data captured in AWR.


Question 11:

Which two items are key for maintaining data consistency in Oracle Database 12c?

A. undo data

B. isolation level

C. lock mechanism

D. serializability

Correct Answer: C

Reference: http://docs.oracle.com/cd/E11882_01/server.112/e25789/consist.htm#CNCPT88969 (overview of the oracle database locking mechanism)


Question 12:

You are about to install Oracle Database 12c Enterprise Edition. Which statement is true?

A. You should not install the Oracle Database software into an existing Oracle home from a different release.

B. A multitenant container database (CDB) can have several pluggable databases (PDBs) with different character sets.

C. Oracle recommends that you back up the root. sh script after you complete the installation.

D. Cloning an Oracle home is useful if you are performing multiple Oracle Database Installations.

E. You can stop existing Oracle processes, including the listener and the database running in the Oracle home, before the database software installation.

Correct Answer: B


Question 13:

Which logical storage relationship is correct?

A. Tablespace< Segment < Extent < Oracle Datablock

B. B) Segment < Extent < Oracle Datablock<Tablespace

C. Tablespace< Extent < Segment < Oracle Datablock

D. Data File <Tablespace< Segment < Extent < Oracle Datablock

Correct Answer: A

Reference: http://www.dummies.com/how-to/content/basics-of-logical-structures-in-oracle- 12c.html


Question 14:

Which two statements about multitenant architecture are true?

A. Multiple PDBs on a single server need multiple database instances and multiple sets of database files.

B. Although consolidated into a single physical database, PDBs mimic the behavior of non-CDBs.

C. A PDB administrator can use Oracle Flashback or point-in-time recovery to retrieve lost data from a PDB, only by shutting down all the PDBs from the CDB.

D. It is easier to collect performance metrics for many databases in a CDB than individual non-CDB databases.

E. It takes more time to apply a patch to one CDB that holds hundreds of PDBs than to hundreds of non-CDB databases.

Correct Answer: BD

B: A PDB is a portable collection of schemas, schema objects, and non schema objects that appears to an Oracle Net client as a non-CDB. All Oracle databases before Oracle Database 12c were non-CDBs.

D: Ease of performance tuning

It is easier to collect performance metrics for a single database than for multiple databases. It is easier to size one SGA than 100 SGAs.

Reference: Benefits of the Multitenant Architecture for Database Consolidation

URL: http:// docs.oracle.com/cd/E16655_01/server.121/e17633/cdbovrvw.htm#CNCPT89239


Question 15:

Which three statements represent the benefits of multitenant architecture for database consolidation?

A. You can unplug a PDB from a development CDB and plug it into a production CDB, which allows for easier and more rapid movement of data and code.

B. You can consolidate shared database memory by combining multiple PDBs in a single CDB.

C. Patching individual PDBs requires the same amount of time as patching individual databases.

D. Consolidating separate databases into a single CDB requires the same amount of storage allocation.

E. In multitenant architecture, a PDB behaves the same as a non-CDB as seen from a client connecting with Oracle Net. No client modification is required.

Correct Answer: ADE

A: By design, you can quickly plug a PDB into a CDB, unplug the PDB from the CDB, and then plug this

PDB into a different CDB. The implementation technique for plugging and unplugging is similar to the

transportable tablespace technique.

D: The process of consolidating data from multiple databases into one database on one computer is

known as database consolidation. Starting in Oracle Database 12c, the Oracle Multitenant option enables

you to consolidate data and code without altering existing schemas or applications.

By consolidating hardware and sharing database memory and files, you reduce costs for hardware,

storage, availability, and labor. For example, 100 PDBs on a single server share one database instance

and one set of database files, thereby requiring less hardware and fewer personnel.

E: A PDB is a portable collection of schemas, schema objects, and non schema objects that appears to an Oracle Net client as a non-CDB. All Oracle databases before Oracle Database 12c were non-CDBs.

Reference: Benefits of the Multitenant Architecture for Database Consolidation

URL: http:// docs.oracle.com/cd/E16655_01/server.121/e17633/cdbovrvw.htm#CNCPT89239


 

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