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Oracle 1Z0-058

Oracle Real Application Clusters 11g(R) Release 2 and Grid Infrastructure Administration

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1Z0-058 Questions and Answers

1Z0-058


Explanation:

Creating an Oracle RAC Database with DBCA Oracle ships templates for the following two workload types: General purpose or transaction processing Data warehouse For more complex environments, you can select the Custom Database option. This option does not use templates and results in a more extensive interview, which means that it takes longer to create your database. Oracle® Real Application Clusters Installation Guide 11g Release 2 (11.2) for Linux and UNIX


QUESTION: 131

Examine the following output: [[email protected] ~]$ sudo crsctl config crs

CRS-4622: Oracle High Availability Services autostart is enabled. [[email protected] ~]$ srvctl config database -d RACDB -a Database unique name: RACDB

Database name: RACDB

Oracle home : /u01/app/oracle/product/l11.2.0/dbhome_1 Oracle user: oracle

Spfile: +DATA/ RACDB /spfileRACDB.ora Domain:

Start options: open

Stop options: immediate

Database role: PRIMARY Management policy: AUTOMATIC Server pools: POOL1

Database instances:

Disk Groups: DATA, FRA Services:

Database is enabled Database is policy managed

Oracle Clusterware is started automatically after the system boot. Which two statements are true regarding the attributes of RACDB?


  1. Oracle Clusterware automatically starts RACDB.

  2. You must manually start RACDB.

  3. Database resource is managed by crsd for high availability and may be automatically restarted in place if it fails.

  4. Database resource Is not managed by crsd for high availability and needs to be restarted manually if it fails.


Answer: A, C


Explanation:

Switch Between the Automatic and Manual Policies By default, Oracle Clusterware is configured to start the VIP, listener, instance, ASM, database services, and other resources during system boot. It is possible to modify some resources to have their


profile parameter AUTO_START set to the value 2. This means that after node reboot, orwhen Oracle Clusterware is started, resources with AUTO_START=2 need to be started manually via srvctl. This is designed to assist in troubleshooting and system maintenance. When changing resource profiles through srvctl, the command tool automatically modifies the profile attributes of other dependent resources given the current prebuilt dependencies. The command to accomplish this is: srvctl modify database -d <dbname> -y AUTOMATIC|MANUAL D60488GC11 Oracle 11g: RAC and Grid Infrastructure Administration Accelerated 15–3 3.4.1 Benefits of Using Oracle Clusterware Oracle Clusterware provides the following benefits: Tolerates and quickly recovers from computer and instance failures. Simplifies management and support by means of using Oracle Clusterware together with Oracle Database. By using fewer vendors and an all Oracle stack you gain better integration compared to using third-party clusterware. Performs rolling upgrades for system and hardware changes. For example, you can apply Oracle Clusterware upgrades, patch sets, and interim patches in a rolling fashion, as follows: Upgrade Oracle Clusterware from Oracle Database 10g to Oracle Database 11g Upgrade Oracle Clusterware from Oracle Database release 11.1 to release 11.2 Patch Oracle Clusterware from Oracle Database 11.1.0.6 to 11.1.0.7 Patch Oracle Clusterware from Oracle Database 10.2.0.2 Bundle 1 to Oracle Database 10.2.0.2 Bundle 2 Automatically restarts failed Oracle processes. Automatically manages the virtual IP (VIP) address so when a node fails then the node's VIP address fails over to another node on which the VIP address can accept connections. Automatically restarts resources from failed nodes on surviving nodes. Controls Oracle processes as follows: For Oracle RAC databases, Oracle Clusterware controls all Oracle processes by default. For Oracle single-instance databases, Oracle Clusterware allows you to configure the Oracle processes into a resource group that is under the control of Oracle Clusterware. Provides an application programming interface (API) for Oracle and non-Oracle applications that enables you to control other Oracle processes with Oracle Clusterware, such as restart or react to failures and certain rules. Manages node membership and prevents split-brain syndrome in which two or more instances attempt to control the database. Provides the ability to perform rolling release upgrades of Oracle Clusterware, with no downtime for applications. Oracle® Database High Availability Overview 11g Release 2 (11.2)


QUESTION: 132

Which four statements are true about services and connection load balancing?


  1. Services provide the ability to balance client connections across the instances in an Oracle RAC configuration.

  2. There are two types of load balancing that you can implement; load balancing decisions can be made by the client and by the listener.

  3. In a RAC database environment, you should select only one load balancing method.

  4. With server-side load balancing, the listener directs a connection request to the best instance that is currently providing the service based on the load-balancing


options selected by the DBA. E. Client-side load balancing balances the connection requests across the listeners.


Answer: A, B, D, E


Explanation:

Services and Connection Load Balancing

The two load balancing methods that you can implement are:

  • Client-side load balancing: Balances the connection requests across the listeners

  • Server-side load balancing: The listener directs a connection request to the best instance currently providing the service by using the load balancing advisory (LBA). FAN, Fast Connection Failover, and LBA depend on a connection load balancing configuration that includes setting the connection load balancing goal for the service.

    The load balancing goal for the service can be either:

  • LONG: For applications having long-lived connections. This is typical for connection pools and

    SQL*Forms sessions.

  • SHORT: For applications that have short-lived connection

Oracle Net Services provides the ability to balance client connections across the instances in an Oracle RAC configuration. You can implement two types of load balancing: client-side and server- side.

Client-side load balancing balances the connection requests across the listeners. With server-side load balancing, the listener directs a connection request to the best instance currently providing the service by using the load balancing advisory.

In a RAC database, client connections should use both types of connection load balancing. D60488GC11

Oracle 11g: RAC and Grid Infrastructure Administration Accelerated 15 – 12


QUESTION: 133

You are managing a three-instance policy-managed RAC database PROD. You created a service called GL for the PROD database by using the following command: [[email protected]~]$ srvctl add service -d PROD -s GL -g SP1 -c singleton -y manual

Examine the following output:

[[email protected]~]$ srvctl config database -d PROD -a Database unique name: PROD

Database name: PROD

Oracle home: /u01/app/oracle/product/11.2.0/dbhome_1 Oracle user: oracle

Spfile: +DATA/PROD/spfileRACDB.ora Domain:

Start options: open

Stop options: immediate

Database role: PRIMARY Management policy: AUTOMATIC Server pools: SP1


Database instances:

Disk Groups: DATA, FRA Services:

Database is enabled Database is policy managed

[[email protected]~]$ crsctl stat res ora.PROD.db NAME=ora.PROD.db TYPE=cluster_resource TARGET=ONLINE

STATE=ONLINE on gr7597 ONLINE on gr7602 ONLINE on gr7633

[[email protected]~]$ crsctl stat serverpool ora.SP1 NAME=ora.SP1

ACTIVE_SERVERS=gr7597 gr7602 gr7633

[oracle®gr7597-]$ crsctl stat res ora.prod.gl.svc

NAME=ora.prod.gl.svc TYFE=ora.service.type TARGET=ONLINE STATE=ONLINE on gr7597

Which three steps are required to enable ODP.NET clients that connect to the GL service to receive FAN High Availability Events?


  1. Enable Advanced Queuing notifications by using SRVCTL as shown in the following command: $ srvctl modify service -d prod -s gl -q TRUE -j LONG

  2. Execute the following statement for the users that will be connecting by way of the .Net Application, where user_name is the user name: EXECUTE DBMS_AQADM.GRANT_QUEUE_PRIVILEGE( 'DEQUEUE', '

    SYS.SYS$SERVICE_METRICS', user_name ) ;

  3. Enable Transparent Application Failover (TAF), either on the client or for the service.

  4. Enable Fast Connection Failover for ODP.NET connection pools by subscribing to FAN High Availability events. Do this by setting the HA events connection string attribute to true at connection time.

  5. Link client applications with the client thread or operating system library.


Answer: A, B, D


Explanation:

Enabling ODP.NET Clients to Receive FAN High Availability Events Perform the following steps to enable FAN for ODP.NET clients: Enable Advanced Queuing notifications for a service by using SRVCTL as shown in the following example: srvctl modify service -d crm -s odpnet.example.com -q TRUE Grant permissions on the internal event queue table by executing the following command for the users that will be connecting by way of the ODP.NET application, where user_name is the database user name: EXECUTEDBMS_AQADM.GRANT_QUEUE_PRIVILEGE('DEQUEUE','SYS.S

YS$SERVICE_MET RICS', user_name); Enable Fast Connection Failover for ODP.NET connection pools by subscribing to FAN high availability events. To enable FCF, include "HA Events=true" and "pooling=true" (the default value) in the


connection string, as shown in the following example where user_name is the name of the database user and password is the password for that user: con.ConnectionString =

"User Id=user_name;Password=password;Data Source=odpnet;" +

"Min Pool Size=10;Connection Lifetime=120;Connection Timeout=60;" + "HA Events=true;Incr Pool Size=5;Decr Pool Size=2";

Oracle® Real Application Clusters Administration and Deployment Guide 11g Release 2 (11.2)


QUESTION: 134

Examine the Exhibit.**Missing Exhibit** Which three statements are correct?


  1. Global Cache Block Access Latency indicates how many block transfers incurred a delay (busy) or an unexpected longer delay (congested).

  2. Global Cache Block Access Latency indicates how many block transfers received blocks cached by other instances as well as blocks read from disk.

  3. Global Cache Block Transfer Rate shows the total aggregated number of blocks received by all instances in the cluster over the interconnect.

  4. Global Cache Block Transfer Rate is essentially a profile of how much work is performed in the local buffer cache, rather than the portion of remote references and physical reads, which both have higher latencies.

  5. Global Cache Block Transfers and Physical Reads shows the percentage of read operations that retrieved blocks from disk, and the buffer cache of other instances using Cache Fusion.

  6. Global Cache Block Transfers and Physical Reads shows the aggregated number of data blocks received by all instances in the cluster over the interconnect.


Answer: A, C, E


Explanation:

Global Cache Block Access Latency The global cache access latency represents the end-to-end elapsed time for a block request. The request is timed from when the request is initiated until it completes. Cache transfer indicates how many current and CR blocks per block class were received from remote instances, including how many transfers incurred a delay (busy) or an unexpected longer delay (congested). If accessing a database block of any class does not locate a buffered copy in the local cache, a global cache operation is initiated. Before reading a block from disk, an attempt is made to find the block in the buffer cache of another instance. If the block is present in another instance, a version of the block may be shipped. Two different kinds of blocks are distinguished: current and consistent read blocks. The average block receive time represents the end-to-end elapsed time or latency for a block request. Global Cache Block Transfer Rate The global cache block transfer rate shows the total aggregated number of data blocks received by all instances in the


cluster by way of an interconnect. If a logical read fails to find a copy ofthe buffer in the local cache, it attempts to find the buffer in the database cache of a remote instance. If the block is present in another database, it is sent to the current instance. Global Cache Block Transfers and Physical Reads The chart represents the percentage of logical reads that read data from the buffer cache of other instances via Direct Memory Access and from disk. It is essentially a profile of how much work is performed in the local buffer cache, rather than the portion of non-local references that incur some latency overhead. Active Sessions for Cluster Wait Class The chart represents the active sessions for the cluster wait class. You can view the top modules and top SQL for a time period by selecting the time period in the active sessions chart. Oracle Enterprise Manager Online Help


QUESTION: 135

orcl1, orcl2, and orcl3 are tnsnames that connect to predefined instances of a three- instance RAC database which uses ASM for shared storage. The database is in archivelog mode. Examine the Exhibit for the tnsnames.ora entries for orcl1, orcl2, and orcl3.


You plan to execute the following RMAN commands to back up the database: RUN{ ALLOCATE CHANNEL CH1 DEVICE TYPE DISK CONNECT 'user1/[email protected]'; ALLOCATE CHANNEL CH2 DEVICE TYPE DISK CONNECT 'user2/[email protected]'; ALLOCATE CHANNEL CH3 DEVICE TYPE DISK CONNECT 'user3/[email protected]'; BACKUP DATABASE PLUS ARCHIVELOG; }

What should be the database mode on each of the three instances for this backup to succeed?


  1. The database can be either mounted or open on all three instances.

  2. The database must be open on all three instances.

  3. The database must be open on any one instance and mounted on the other two instances.

  4. The database must be mounted on any one of the instances and the other instances will be mounted automatically.


Answer: A


Explanation: connectStringSpec Purpose

Use the connectStringSpec subclause to specify the user name, password, and net service name for connecting to a target, recovery catalog, or auxiliary database. The connection is necessary to authenticate the user and identify the database.

Prerequisites

You must have SYSDBA privileges to CONNECT to a target or auxiliary database. Do not connect to the recovery catalog database as user SYS. Usage Notes

RMAN connections to a database are specified and authenticated in the same way as SQL*Plus connections to a database. The only difference is that RMAN connections to a target or auxiliary database require the SYSDBA p rivilege. The AS SYSDBA keywords are implied and cannot be explicitly specified. See Oracle

Database Administrator's Guide to learn about database connection options when using

SQL*Plus.

Oracle® Database Backup and Recovery Reference 11g Release 2 (11.2)


QUESTION: 136

The Global Cache Block Access Latency chart shows high elapsed times. What are two possible causes for this?


  1. badly written SQL statements

  2. storage network bottlenecks

  3. a large number of requested blocks not cached in any instance

  4. slow or faulty interconnect


Answer: A, D


Explanation:

About Global Cache Block Access Latency Chart

If the Global Cache Block Access Latency chart shows high latencies (high elapsed times), then this can be caused by any of the following:

A high number of requests caused by SQL statements that are not tuned.

A large number of processes in the queue waiting for the CPU, or scheduling delays. Slow, busy, or faulty interconnects. In these cases, check your network connection for dropped packets, retransmittals, or cyclic redundancy check (CRC) errors. Oracle® Database 2 Day + Real Application Clusters Guide

11g Release 2 (11.2)


QUESTION: 137

Which three steps must be completed to configure Fast Connection Failover for the CRM service with an Oracle Call Interface client?


  1. Ensure that the CRM service has Advanced Queuing notifications enabled by setting the services values of AQ_HA_NOTIFICATIONS to TRUE. For example: $ srvctl modify service -d crm -s gl.us.oracle. com \ -q TRUE -P BASIC -e SELECT - z 180 -w 5 -j LONG

  2. Enable OCI_EVEINTS on the client at environment creation time by using the OCIEnvCreate(…) function.

  3. Use Oracle Call Interface to configure UP events for the service.

  4. Client applications must be linked with the client thread or operating system library.


Answer: A, B, D


Explanation:

Configuring FCF for OCI Clients OCI applications must connect to an Oracle RAC instance to enable HA event notification. Furthermore, these applications must perform the following steps to configure FCF for an OCI client: Configure the service for your OCI connection pool to enable connection load balancing and runtime connection load balancing. Also configure the service to have Advanced Queuing notifications enabled, as shown in the following example: $ srvctl modify service -d crm -s ociapp.example.com -q TRUE -B THROUGHPUT -j LONG Set the context of the environment for OCI calls on the client to enable subscriptions by using the OCIEnvCreate() call, setting the MODE parameter value to OCI_EVENTS, as follows: (void) OCIEnvCreate(&myenvhp, OCI_EVENTS|OCI_OBJECT, ...); Link the application with a thread library. After linking with the thread library, the applications can register a callback that is invoked whenever a FAN event occurs. Oracle® Real Application Clusters Administration and Deployment Guide 11g Release 2 (11.2)


QUESTION: 138

Assuming a RAC database called ORCL, select three statements that correctly demonstrate management actions for the AP service.


  1. To start the AP service, execute: srvctl start service -d ORCL -s AP

  2. To disable the AP service on the ORCL4 instance, execute: srvctl disable service

    -d ORCL -s AP -i ORCL4

  3. To stop the AP service, execute: srvctl stop service -s AP

  4. To make ORCL5 a preferred instance for the AP service, execute: srvctl set service -d ORCL -s AP -i ORCL5 -r

  5. To relocate the AP service from the ORCL5 instance to the ORCL4 instance, execute: srvctl relocate service -d ORCL -s AP -i ORCL5 -t ORCL4


Answer: A, B, E


Explanation:

SRVCTL Command Reference

srvctl start service -d db_unique_name

[-s "service_name_list" [-n node_name | -i instance_name]] [-o start_options]

srvctl disable service -d db_unique_name

-s "service_name_list" [-i instance_name | -n node_name] srvctl stop service -d db_unique_name [-s "service_name_list" [-n node_name | -i instance_name] [-f]

srvctl relocate service -d db_unique_name -s service_name

{-c source_node -n target_node | -i old_instance_name -t new_instance_name} [-f]

Oracle® Real Application Clusters Administration and Deployment Guide 11g Release 2 (11.2)


QUESTION: 139

Which two actions in a warehousing RAC database may cause concurrent cross- instance calls leading to I/O contention?


  1. truncate table statements

  2. select statements referring to non-partitioned tables

  3. drop table statements

  4. insert statements where each instance inserts into different partitions of a partitioned table


Answer: A, C


Explanation:

Concurrent Cross-Instance Calls: Considerations In data warehouse and data mart environments, it is not uncommon to see a lot of TRUNCATE operations. These essentially happen on tables containing temporary data. In a RAC environment, truncating tables concurrently from different instances does not scale well, especially if, in conjunction, you are also using direct read operations such as parallel queries. As shown in the slide, a truncate operation requires a cross-instance call to flush dirty blocks of the table that may be spread across instances. This constitutes a point of serialization. So, while the first TRUNCATE command is processing, the second has to wait until the first one completes. There are different types of cross-instance calls. However, all use the same serialization mechanism. For example, the cache flush for a partitioned table with many partitions may add latency to a corresponding parallel query. This is because each cross-instance call is serialized at the cluster level, and one crossinstance call is needed for each partition at the start of the parallel query for direct read purposes. D60488GC11 Oracle 11g: RAC and Grid Infrastructure Administration Accelerated 14 – 27 What Application Design considerations should I be aware of when moving to Oracle RAC? The general principals are that fundamentally no different design and coding practices are required for RAC however application flaws in execution or design have a higher impact in RAC. The performance and scalability in RAC will be more sensitive to bad plans or bad schema design. Serializing contention makes applications less scalable. If your customer uses standard SQL and schema tuning, it solves > 80% of performance problems Some of the scaleability pitfalls they should look for are:

  • Serializing contention on a small set of data/index blocks

    --> monotonically increasing key

    --> frequent updates of small cached tables

    --> segment without automatic segment space management (ASSM) or Free List Group (FLG)

  • Full table scans

    --> Optimization for full scans in 11g can save CPU and latency

  • Frequent invalidation and parsing of cursors

    --> Requires data dictionary lookups and synchronizations

  • Concurrent DDL ( e.g. truncate/drop ) Look for:

  • Indexes with right-growing characteristics

    --> Use reverse key indexes

    --> Eliminate indexes which are not needed

  • Frequent updated and reads of “small” tables

    --> “small”=fits into a single buffer cache

    --> Use Sparse blocks ( PCTFREE 99 ) to reduce serialization

  • SQL which scans large amount of data

--> Perhaps more efficient when parallelized

--> Direct reads do not need to be globally synchronized ( hence less CPU for global cache ) RAC: Frequently Asked Questions [ID 220970.1]

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