ibm actualtests 000-540 exam questions & answers · 1/6/2014 · solution is called heartbeat...

IBM Actualtests 000-540 Exam Questions & Answers

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IBM 000-540 Exam Questions & Answers

Exam Name: IBM PureData System for Analytics v7.0

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QUESTION 1A SELECT statement spends all its time returning 1 billion rows. What can be done to make this faster?

A. Use a CURSORB. Use an EXTERNAL TABLEC. Use the COPY commandD. Increase PreFetch Count

Correct Answer: BSection: (none)Explanation

Explanation/Reference:Use an EXTERNAL TABLECREATE EXTERNAL TABLE <table_name >[SAMEAS table_name ]|([column_name [,...]]) USING (DATAOBJECT (<file_path >)[MODE truncate |append ][DELIMITER<delimiter >]);

Example:CREATE EXTERNAL TABLE customer_ext SAMEAS customerUSING (DATAOBJECT ('/tmp/customer.unl ') DELIMITER '|');--load data to Ext tableINSERT INTO customer_ext SELECT * FROM customer ;

QUESTION 2nzbackup/nzrestore with the -user option has been replaced with which option to allow multi-level security(MLS) information, such as categories, cohorts, and levels to be backed up/restored?

A. -allB. -mlsC. -usersD. -globals

Correct Answer: DSection: (none)Explanation

Explanation/Reference:-globalsBacks up all users, groups, and global permissions. The command also backs up multi-level security objectssuch as categories, cohorts, and levels

QUESTION 3When loading a local ASCII file into table via an external table, where can the SQL be submitted?

A. From a User Defined Function.B. From a JDBC application networked to the system.C. From nzsql on an AIX machine networked to the system.D. From nzsql on Microsoft Windows networked to the system.


Explanation/Reference:

QUESTION 4Which is NOT a function that can be performed by nzbackup ?

A. Backup dataB. Backup schemasC. Backup users/groupsD. Backup the /nz/data directory



QUESTION 5Which nzload operation statement is correct?


A. nzload must have a control file.B. nzload performs singleton inserts.C. nzload user must have CREATE EXTERNAL TABLE privilege.D. nzload must be run from the PureData System for Analytics host.

Correct Answer: CSection: (none)Explanation

Explanation/Reference:control file is optionalThe nzload command is an ODBC client application that loads data either: • Remotely on all the supported client platforms.• Locally. on the Netezza host.The nzload program performs all inserts into the target table within a single transaction . A commit is issued atthe end of the nzload program. If a load is unable to complete (due to fatal errors) and the transaction can notbe committed all records are logically deleted.

QUESTION 6You have access to two databases, DEV and PROD. Currently you are connected to the DEV database. Whichoperation is permitted?

A. Delete from PROD..TableA

B. Select * from PROD..TableAC. Truncate table PROD..TableAD. Insert into PROD..TableA select * from DEV..TableB


Explanation/Reference:NPS supports cross database access to referenced objects, tables and views on the same (within a single)Netezza system. There is no impact on performance whether the objects are in the same or differentdatabases. Server to server cross database access is not supported as cross database join performance is notoptimal.Cross database access support is limited to SELECT (queries) only and does not support INSERT, UPDATEand DELETE operations of referenced objects.However cross database access does allow SELECT ... FROM clauses to include INSERT, DELETE,UPDATE, CTAS statements, joins, set operations, aggregations, sub-selects, and view definitions on thecurrent database. The current database is the database that nzsql is connected to.

QUESTION 7What is required to troubleshoot a query?

A. nzevents and the pg.log.B. nzsql and the ODBC config.C. nzinventory and the dbos.log.D. nzdumpschema and the execution plan.


Explanation/Reference:Use the nzdumpschema command to generate a shell script with SQL statements that duplicate a database byextracting the given database's schema and statistics.Use the nzdumpschema command to dump the table and view definitions, the database statistical information,and optionally, any UDXs that are registered within the database. It is a diagnostic tool that you can use to troubleshoot a variety of problems relating to a query.� You must run it from the host Netezza system.� You cannot use -u, -pw, -host, or other nz CLI options.� You have must have set the NZ_USER and NZ_PASSWORD environment variables.� You must specify a database.

Example:nzdumpschema sales salesSchema /tmp/UdxObjs

QUESTION 8Given a plan ID, how would you obtain the query execution plan? (Choose two.)

A. Turn ODBC tracing ON.B. Issue "SELECT * FROM _V_SESSION;"C. Go to the query history within the Windows NzAdmin GUI tool.D. Run EXECUTION PLAN before the query has been submitted.E. Issue "SHOW PLANFILE <nn>;" after the query has been submitted.

Correct Answer: CESection: (none)

Explanation

Explanation/Reference:_V_SESSION provides the following information:ID, PID, UserName, Database, ConnectTime, ConnStatus, and LastCommandand it DOES NOT provide query execution plan

QUESTION 9Which component failure does NOT trigger a HardwareServiceRequested event?

A. FanB. DiskC. HostD. S-Blade



QUESTION 10Which statement describes administrative privileges?

A. Provides audit functionality for the database.B. Manages resource allocations for concurrent processing.C. Gives permission to execute global operations and to create objects.D. Gives additional storage to select members of the administrator group.



QUESTION 11Which is a function of the Linux-HA heartbeat?

A. Performs regeneration of failed disks on the hosts.B. Manages communication and processes on the S-Blades.C. Performs disk partitioning and status of jobs on the S-Blades.D. Manages communication and status of services on the hosts.


Explanation/Reference:High-Availability Linux (also referred to as Linux-HA) provides the failover capabilities from a primary or activeNetezza host to a secondary or standby Netezza host. The main cluster management daemon in the Linux-HAsolution is called Heartbeat . Heartbeat watches the hosts and manages the communication and status checks of services. Each service isa resource. Netezza groups the Netezza-specific services into the nps resource group. When Heartbeat detects

problems that imply a host failure condition or loss of service to the Netezza users, Heartbeat can initiate afailover to the standby host.

QUESTION 12Which High-Availability (HA) mechanism is used by the PureData System for Analytics Appliance?

A. AIX-HAB. Linux-HAC. SuSE-HAD. Solaris-HA


Explanation/Reference:The Netezza high availability (HA) solution uses Linux-HA and Distributed Replicated Block Device (DRBD) asthe foundation for cluster management and data mirroring. The host server (often referred to as host within the documentation) is a Linux server that runs the Netezzasoftware and utilities

QUESTION 13A group has a resource allocation maximum of 50% and the job maximum is set to 1. Two users within thisresource group each execute 1 job at the same time, which statement is correct?

A. Each job gets 25% and both run at the same time.B. Each job gets 50% but only one job runs at a time.C. Each job gets 50% and both run at the same time.D. You cannot set the job maximum per resource group.


Explanation/Reference:Set limits using the ALTER GROUP command:– MAX – a hard limit on resource use• Example: If the group has a maximum resource percentage of 50%, the group will not receive more than 50%of the system resources, even if the Netezza system is otherwise idle.• If the group has an unlimited maximum of 100%, the group can use all the system resources if no other grouphas submitted work on the system.•ALTER GROUP ... WITH RESOURCE MAXIMUM X– MIN: a sharing factor; a proportion•ALTER GROUP ... WITH RESOURCE MINIMUM X– JOB LIMIT – maximum numbers of concurrent jobs per RSG.

QUESTION 14Given the following query: Select count(*) from TableA; How can you view the query plan without executing thequery?

A. Use explain.B. Use statistics.C. Use pg.log file.D. Set show_plan = true;

Correct Answer: A

Section: (none)Explanation

Explanation/Reference:Use the EXPLAIN command to show a statement execution plan.

QUESTION 15TableA is currently being accessed in a number of long running queries. Which of the following operations isNOT blocked, thus allowing the operation to immediately proceed?

A. DROP TABLE TableAB. ALTER TABLE TableAC. TRUNCATE TABLE TableAD. GRANT SELECT ON TableA TO UserA


Explanation/Reference:If the table is in use by an active query, the ALTER command will wait until that query completes.

QUESTION 16What CANNOT be measured and managed by system views?

A. Temperature values on S-blade.B. Status of the host attached storage.C. Power supply status for each frame.D. Resource group utilization and history.



QUESTION 17What will occur when two tables are joined together and the data is NOT collocated?

A. No data movement is required.B. A merge join operation will be performed.C. A cluster based join method is performed.D. Data is dynamically redistributed or broadcasted.



QUESTION 18What is the limitation on join types with floating-point data types?

A. The system does not have a limitation on floating-point data types.B. The system cannot perform any type of join on floating-point data types.C. The system cannot perform a fast sort merge join on a floating point data type, but instead must perform a

slower hash join.D. The system cannot perform a fast hash join on a floating point data type, but instead must perform a slower

sort merge join.



QUESTION 19Which statement is true about data flowing in/out of the PureData System for Analytics Appliance?

A. Bypasses the host.B. Flows through the host.C. Compressed on the host.D. Uncompressed on the host.



QUESTION 20The PureData System for Analytics implements which level of transaction isolation?

A. SerializableB. Committed readC. Repeatable readD. Uncommitted read

Correct Answer: ASection: (none)Explanation


QUESTION 21Which two statements are true about queries on the PureData System for Analytics Appliance? (Choose two.)

A. Queries are executed in parallel by the host.B. Queries must be compressed before they can be executed.C. Queries are compiled into snippets and executed in parallel by the S-Blades.D. Queries must be uncompressed by the user and executed in parallel by the host.E. A query is compiled into a snippet which is executed across all available S-Blades.

Correct Answer: CESection: (none)

Explanation


QUESTION 22In order to set a runaway query event to trigger when a query runs longer than two minutes, which two itemsmust be configured? (Choose two.)

A. The runaway query event was enabled.B. The pg.log file was configured for two minutesC. The runaway query event was configured for two minutes.D. The nzsystem command was used to set the QUERYTIMEOUT to two minutes.E. The CREATE USER command was used to set the QUERYTIMEOUT to two minutes.

Correct Answer: AESection: (none)Explanation

Explanation/Reference:You can use the RunAwayQuery event type to monitor queries that exceed configured query timeout limits. Thequery timeout is a limit that you can specify system-wide (for all users), or for specific groups or users. Thedefault query timeout is unlimited for users and groups, but you can establish query timeout limits using asystem default setting, or when you create or alter users or groups. For more information about specifyingquery limits, see “Specifying Query Timeout Limits” on page 8-29.The following is the syntax for the event rule RunAwayQuery: -name 'RunAwayQuery' -on no -eventType runawayQuery -eventArgsExpr '' -notifyType email -dst'[email protected]' -ccDst '' -msg 'NPS system $HOST - long-running query detected at $eventTimestamp.' -bodyText '$notifyMsg\n\nsessionId:$sessionId\nplanId: $planId\nduration: $duration seconds' -callHome yes -eventAggrCount 0

to ensure that a notification event is triggered when the duration of a query exceeds two minutes, specify the -eventArgsExpr as follows: -eventArgsExpr '$duration > 120'

QUESTION 23In order for an ODBC application running on Microsoft Windows to connect to PureData System for Analytics,which two steps must be performed? (Choose two.)

A. Install nzsql for Windows.B. Install nzAdmin for Windows.C. Install an ODBC driver for Windows.D. Install an ODBC Driver Manager for Windows.E. Create or modify a Data Source Name (DSN) for a connection to a database.

Correct Answer: CESection: (none)Explanation


QUESTION 24Which command is used to abort a user's SQL transaction?

A. kill

B. abortC. nzstopD. nzsession


Explanation/Reference:nzsession Shows a list of current system sessions (load, client, and sql). Suports filtering by session type or user, allowsyou to abort sessions, and change the current job list for a queued session job.nzstop Use the nzstop command to stop system operation. Stopping a system stops all Netezza host processes.Unless you specify otherwise, stopping the system waits for all running jobs to complete.Use either the nzsystem stop or the nzstop command to stop system operation. The nzstop command is ascript that initiates a system stop by halting all processing.Note: You must run nzstop while logged in as a valid Linux user such as nz on the host. You cannot run thecommand remotely.

kill is a Linux command to kill opened process

QUESTION 25Which command allows you to show information about the database hardware as well as take actions such asactivate or deactivate components, locate components, or delete them from the system?

A. sarB. nzhwC. nzsystemD. nzinventory


Explanation/Reference:CORRECTUse the nzhw command to manage the hardware of the Netezza system. The command allows you to showinformation about the system hardware as well as take actions such as activate odeactivate components, locate components, or delete them from the system.nzhw [-h|-rev] [-hc] subcmd [subcmd options]

INCORRECTUse the nzsystem command to change the system state, and show and set configuration information.

nzinventoryThis command is obsolete in Release 5.0. User nzhw instead

QUESTION 26What is the only predefined database user, which is able to access all objects and perform all tasks against thedatabase?

A. rootB. publicC. adminD. system



QUESTION 27What PureData System for Analytics component is responsible for controlling table storage?

A. S-Blade (Snippet-Blade)B. SFI (Switching Fabric Interface)C. FPGA (Field Programmable Gate Array)D. DRBD (Distributed Replicated Block Device)



QUESTION 28What will prevent a GROOM TABLE command from running on a table named TableA?

A. If there are any materialized views on the table TableA.B. If there are any active selects running against the table TableA.C. If there are any active nzloads running against the table TableA.D. f there are any active updates running against the table TableA.



QUESTION 29When a CREATE TABLE AS (CTAS) is performed on a table creating more than 1,000,000,000 rows, whichstatement is true?

A. Groom will be automatically invoked.B. Primary key constraints will be checked.C. Statistics will automatically be generated.D. Materialized views will be automatically generated.



QUESTION 30Which statement is true about the groom feature?

A. Groom allows the user to add row level security.B. Groom validates primary key constraints on the table.C. Groom reorders rows based on the DISTRIBUTE ON clause.D. Groom allows the user to reorganize tables based on the ORGANIZE ON clause.


Explanation/Reference:Starting in Release 6.0, you use the GROOM TABLE command to maintain the user tables by reclaiming diskspace for deleted or outdated rows, as well as to reorganize the tables by their organizing keys. The GROOM TABLE command processes and reorganizes the table records in each data slice in a series of“steps.” Users can perform tasks such as SELECT, UPDATE, DELETE, and INSERT operations while theonline data grooming is taking place. The SELECT operations run in parallel with the groom operations; anyINSERT, UPDATE, and DELETE operations run serially between the groom steps.

QUESTION 31Which statement is true?

A. All user space is available for database expansion.B. Each database is assigned it's own section of disk space.C. When creating the database you can specify which disks to use.D. When you create a database you can set the maximum space it is allowed to use.



QUESTION 32Which CREATE DATABASE attributes are required?

A. The database name.B. The database name and the redo log file name.C. The database name and the table space name.D. The database name and the temporary table space name.



QUESTION 33Which statement is true for database users and groups?

A. All users must belong to admin group.B. Creation of users and groups is not allowed.C. Users and groups are local and tied to a particular database.D. Users and groups are global and not tied to a particular database.



QUESTION 34Which two characteristics describe materialized views. (Choose two.)

A. Materialized views can contain aggregates.B. Materialized views can contain a HAVING clause.C. Materialized views can contain a WHERE clause.D. Materialized views can contain an ORDER BY clause.E. Materialized views can reference only one base table in the FROM clause.

Correct Answer: DESection: (none)Explanation


QUESTION 35What is a benefit of Clustered Base Tables?

A. Replicates base table data.B. An alternate way to order a table's data.C. Materializes on disk joins between tables.D. Increases the performance of load operations.



QUESTION 36When are zonemaps initially created for a table?

A. nzbackupB. nzreclaimC. CREATE TABLED. ALTER TABLE ADD ZONEMAPS


Explanation/Reference:Note: nzreclaim command has been replaced by GROOM command

QUESTION 37On which component(s) does the UDX run?

A. The host only.B. The host and the S-blades only.C. The S-blades and the FPGAs only.

D. The host, the S-blades and the FPGAs.



QUESTION 38Which procedural logic is NOT supported by NZPLSQL?

A. Scrollable CursorsB. Looping (while, for)C. Conditionals (if/else)D. Returning a scalar result or a result set



QUESTION 39Zone Maps provide what information about a table?

A. The list of unique column values found within an extent.B. An index pointer to each row's exact location in the base table.C. The minimum and maximum column values found within an extent.D. The connection between the map and reduce stages when using MapReduce.



QUESTION 40Which will result in support for zonemaps on the LastName column?

A. CREATE TABLE TableA (LastName VARCHAR(20));B. CREATE TABLE TableA (LastName VARCHAR(20));

ALTER TABLE TableA ZONEMAP ON (LastName);C. CREATE TABLE TableA (LastName VARCHAR(20)) DISTRIBUTE ON (LastName);D. CREATE TABLE TableA (LastName VARCHAR(20));

CREATE MATERIALIZED VIEW ViewA AS SELECT * FROM TableA ORDER BY LastName;


Explanation/Reference:The system creates zone maps for all columns in SPM (sorted , projected, materialized) views that have datatypes integer, date, and timestamp. The system also creates zone maps for all ORDER BY columns in the SPMview, except for columns of numeric types that are larger than 8 bytes (19 decimal digits or more).

QUESTION 41What is the maximum number of columns you can choose as organizing keys for clustered base table?

A. 1B. 2C. 4D. 8


Explanation/Reference:A clustered base table (CBT) is a user table that contains data which is organized using one to four organizingkeys. An organizing key is a column of the table that you specify for clustering the table records; Netezza usesthe organizing keys to group records within the table and save them in the same or nearby extents. Netezzaalso creates zone maps for the organizing columns to accelerate the performance of queries on that table thatrestrict using the organizing keys.

QUESTION 42Which clause CANNOT be used with a CREATE VIEW statement?

A. SUM ()B. GROUP BYC. ORDER BYD. OUTER JOIN



QUESTION 43What is the function of the Distributed Replicated Block Device (DRBD)?

A. High AvailabilityB. Load BalancingC. High ConcurrencyD. Work Load Management


Explanation/Reference:Distributed Replicated Block Device (DRBD) is a block device driver that mirrors the content of block devices(hard disks, partitions, logical volumes, and so on) between the hosts. Netezza uses the DRBD replication onlyon the /nz and /export/home partitions.As new data is written to the /nz partition and the /export/home partition on the primary host, the DRBDsoftware automatically makes the same changes to the /nz and /export/home partition of the standby host.

QUESTION 44Which statement is true about a simple load using external tables?

A. The load can be configured to automatically continue to load if the S-Blade resets or fails.B. The load can be configured to automatically create a backup file of the table being loaded.C. The load can be configured to automatically create a duplicate copy of the table being loaded.D. The load can be configured to automatically remove duplicate rows from the table being loaded.



QUESTION 45nzload is invoked with the "allowReplay" option enabled. While the PureData System for Analytics Appliancechanges state from online to pausing then to online, which statement is true about the nzload process on theAppliance?

A. nzload will fail.B. nzload automatically continues without user intervention.C. nzload must be stopped and resumed by the user from the last check point.D. nzload automatically restarts but the user must remove the allowReplay option.



QUESTION 46If data is being nzload'ed into TableA, which of the following operations will be blocked until the load hascompleted?

A. DELETE from TableAB. SELECT from TableAC. TRUNCATE of TableAD. A nzbackup of the database in which TableA resides



QUESTION 47

What two conditions must be met to achieve a collocated join between two tables? (Choose two.)

A. Both tables have primary keys defined.B. Both join columns have the same name.C. Both tables must be distributed on random.D. Both join columns have identical data types.E. Both tables must be distributed on their join column.

Correct Answer: DESection: (none)Explanation


QUESTION 48Which statement is true regarding the compress engine?

A. Compression ratio is data dependent.B. Compression is performed by the host.C. Compression degrades data scan speeds.D. Compression is performed by the SAS switches.



QUESTION 49The PureData System for Analytics implements which level of transaction isolation?

A. SerializableB. Committed readC. Repeatable readD. Uncommitted read



QUESTION 50The simplest query execution plan file must have the following minimum nodes?

A. ScanNode, RestrictNode, LimitNode, ReturnNodeB. ScanNode, RestrictNode, HashNode, ReturnNodeC. ScanNode, RestrictNode, ProjectNode, ReturnNodeD. ScanNode, RestrictNode, AggregateNode, ReturnNode

Correct Answer: CSection: (none)

Explanation


QUESTION 51What two types of notification can be configured for an event? (Choose two.)

A. Insert a row into TableA.B. Run a stored procedure.C. Run a command on the active Host.D. Send an email to a list of addresses.E. Send a Simple Network Message Protocol (SNMP) event.

Correct Answer: CDSection: (none)Explanation

Explanation/Reference:When an event occurs, you can have the system send an e-mail message or execute an external command

QUESTION 52If user A has a minimum resource allocation of 20% and a maximum of 80%, user A can receive whatpercentage of available resources?

A. A maximum of 20% of resources when other users are on the system.B. A maximum of 50% of resources when other users are on the system.C. A maximum of 80% of resources when no other users are on the system.D. A maximum of 100% of resources when no other users are on the system.



QUESTION 53What is the fastest join utilized by PureData System for Analytics?

A. Hash join.B. Merge join.C. Expression join.D. Cross product join.



QUESTION 54Which statement is NOT true regarding the nzload utility?

A. nzload runs on windows.B. nzload runs on SuSE Linux.C. nzload blocks update/delete against the target table.D. nzload runs on the PureData System for Analytics host.


Explanation/Reference:The nzload command is an ODBC client application that loads data remotely or locally. You can use the nzloadcommand on the Netezza host and on all the supported client platforms.

QUESTION 55When unloading data via an external table, where can the SQL be submitted?

A. From a User Defined Function.B. From nzsql on an AIX machine networked to the system.C. From nzsql on Microsoft Windows networked to the system.D. From an ODBC application on Windows networked to the system.



QUESTION 56Which file format is NOT supported by the nzload utility?

A. ASCII delimited format.B. Fixed length record format.C. gzip compressed file format.D. PureData System for Analytics compressed file format.



QUESTION 57You have access to two databases, DEV and PROD. Currently you are connected to the DEV database. Whichoperation is permitted?

A. Delete from PROD..TableAB. Select * from PROD..TableAC. Truncate table PROD..TableAD. Insert into PROD..TableA select * from DEV..TableB


Explanation/Reference:Only SELECT allowed for cross database queris

QUESTION 58Within a single PureData System for Analytics, what is the fastest way to copy a 10TB TableA from DatabaseAto another DatabaseB?

A. Use the COPY command.B. Use external tables and UNIX pipes.C. Use nzbackup and nzrestore commands.D. Use a CTAS (Create Table as Select) SQL statement.



QUESTION 59When enabled, query history always collects information about login failures, session creation, session termination, and query history process startup. Which area does query history NOTcollect data?

A. PlansB. DisksC. TablesD. Queries



QUESTION 60With LDAP enabled, which of the following is verified against an LDAP server?

A. Database user ADMIN privileges.B. Database user SELECT privileges.C. Database user GROUP authentication.D. Database user password authentication.



QUESTION 61A stored procedure returning one value is created, which two methods can be used to execute the procedure?(Choose two.)

A. Using the EXECUTE command.B. Using the SELECT statement within a FROM clause.C. Using the SELECT statement within a HAVING clause.D. Using the SELECT statement without a FROM clause.E. Using the SELECT statement with tables in the FROM clause.

Correct Answer: ADSection: (none)Explanation


QUESTION 62All database users are members of what predefined database group, which governs the basic accesspermissions that are granted to the system?

A. GUESTB. USERSC. PUBLICD. GLOBAL



QUESTION 63Which two commands can be used to shut the database system down? (Choose two.)

A. nzstopB. nzdownC. nzhw stopD. nzsystem stopE. service halt nps

Correct Answer: ADSection: (none)Explanation

Explanation/Reference:CORRECT:Use either the nzsystem stop or the nzstop command to stop system operation. The nzstop command is ascript that initiates a system stop by halting all processing.Note: You must run nzstop while logged in as a valid Linux user such as nz on the host. You cannot run thecommand remotely.

INCORRECT:Use the nzhw command to manage the hardware of the Netezza system. The command allows you to showinformation about the system hardware as well as take actions such as activate or deactivate components,locate components, or delete them from the system.

QUESTION 64

What is nzconvert used for?

A. To convert compressed external tables into ASCII text.B. To convert between character encodings before loading data.C. To translate stored procedures into NZPLSQL compatible syntax.D. To upgrade/downgrade the database to a different software version.


Explanation/Reference:Use the nzconvert command to convert between any two encodings, between these encodings and UTF-8,and from UTF-32, -16, or -8 to NFC, for loading with the nzload command or external tables.

QUESTION 65Which option does NOT trigger a HardwareNeedsAttention event?

A. A power supply has failed.B. A switch has been rebooted.C. A SAS cable fails or is disconnected.D. A chassis or fabric switch port is in a down state for longer than the defined threshold.



QUESTION 66Which piece of information is NOT gathered as part of the statistical information when generate statistics is runon a table?

A. The number of rows in the table.B. The number of updated rows in the table.C. The minimum and maximum value in each column.D. The number of unique or distinct values in each column.



QUESTION 67What should be considered when you are asked to select the distribution key columns for a very large facttable?

A. As many columns as possible.B. Columns that contain many nulls.C. Columns that contain few unique values.D. Columns used to join to other large tables.



QUESTION 68Which statement is true?

A. All user space is available for database expansion.B. Each database is assigned it's own section of disk space.C. When creating the database you can specify which disks to use.D. When you create a database you can set the maximum space it is allowed to use.



QUESTION 69Which statement is true about optimizer settings?

A. They can be set system wide only.B. They can be set at the database level only.C. They can be set at the session and at the group level.D. They can be set system wide and at the session level.



QUESTION 70What are two considerations for usage of materialized views? (Choose two)

A. Materialized views are not supported.B. Materialized views are logical entities.C. Materialized views may improve query performance.D. Materialized views are the same as database views.E. Materialized views are considered for usage by the Optimizer.

Correct Answer: CESection: (none)Explanation


ibm actualtests 000-540 exam questions & answers · 1/6/2014 · solution is called heartbeat...

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