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Oracle RAC Interview Questions
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Oracle RAC Interview Questions http://neworacledba.blogspot.com What are the administrative tools used for Oracle RAC environments? Oracle RAC cluster can be administered as a single image using OEM(Enterprise Manager),SQL*PLUS,Servercontrol(SRVCTL),clusterverificationutility(cvu),DBCA,NE TCA How do we verify that RAC instances are running? Issue the following query from any one node connecting through SQL*PLUS. $connect sys/sys as sysdba SQL>select * from V$ACTIVE_INSTANCES; The query gives the instance number under INST_NUMBER column,host_:instancename under INST_NAME column. What is FAN? Fast application Notification as it abbreviates to FAN relates to the events related to instances,services and nodes.This is a notification mechanism that Oracle RAc uses to notify other processes about the configuration and service level information that includes service status changes such as,UP or DOWN events.Applications can respond to FAN events and take immediate action. Where can we apply FAN UP and DOWN events? FAN UP and FAN DOWN events can be applied to instances,services and nodes. State the use of FAN events in case of a cluster configuration change? During times of cluster configuration changes,Oracle RAC high availability framework publishes a FAN event immediately when a state change occurs in the cluster.So applications can receive FAN events and react immediately.This prevents applications from polling database and detecting a problem after such a state change. Why should we have seperate homes for ASm instance? It is a good practice to have ASM home seperate from the database hom(ORACLE_HOME).This helps in upgrading and patching ASM and the Oracle database software independent of each other.Also,we can deinstall the Oracle database software independent of the ASM instance. What is the advantage of using ASM? Having ASM is the Oracle recommended storage option for RAC databases as the ASM maximizes performance by managing the storage configuration across the disks.ASM does this by distributing the database file across all of the available storage within our cluster database environment. What is rolling upgrade? It is a new ASM feature from Database 11g.ASM instances in Oracle database 11g release(from 11.1) can be upgraded or patched using rolling upgrade feature. This enables us to patch or upgrade ASM nodes in a clustered environment without affecting database availability.During a rolling upgrade we can maintain a functional cluster while one or more of the nodes in the cluster are running in different software versions. Can rolling upgrade be used http://neworacledba.blogspot.com to upgrade from 10g to 11g database? No,it can be used only for Oracle database 11g releases(from 11.1).
http://neworacledba.blogspot.com State the initialization parameters that must have same value for every instance in an Oracle RAC database:Some initialization parameters are critical at the database creation time and must have same values.Their value must be specified in SPFILE or PFILE for every instance.The list of parameters that must be identical on every instance are given below: ACTIVE_INSTANCE_COUNT ARCHIVE_LAG_TARGET COMPATIBLE CLUSTER_DATABASE CLUSTER_DATABASE_INSTANCE CONTROL_FILES DB_BLOCK_SIZE DB_DOMAIN DB_FILES DB_NAME DB_RECOVERY_FILE_DEST DB_RECOVERY_FILE_DEST_SIZE DB_UNIQUE_NAME INSTANCE_TYPE (RDBMS or ASM) PARALLEL_MAX_SERVERS REMOTE_LOGIN_PASSWORD_FILE UNDO_MANAGEMENT Can the DML_LOCKS and RESULT_CACHE_MAX_SIZE be identical on all instances?
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Oracle RAC Interview Questions instances? These parameters can be identical on all instances only if these parameter values are set to zero. What two parameters must be set at the time of starting up an ASM instance in a RAC environment?The parameters CLUSTER_DATABASE and INSTANCE_TYPE must be set. Mention the components of Oracle clusterware:Oracle clusterware is made up of components like voting disk and Oracle Cluster Registry(OCR). What is a CRS resource? Oracle clusterware is used to manage high-availability operations in a cluster.Anything that Oracle Clusterware manages is known as a CRS resource.Some examples of CRS resources are database,an instance,a service,a listener,a VIP address,an application process etc. What is the use of OCR? Oracle clusterware manages CRS resources based on the configuration information of CRS resources stored in OCR(Oracle Cluster Registry). How does a Oracle Clusterware manage CRS resources? http://neworacledba.blogspot.com Oracle clusterware manages CRS resources based on the configuration information of CRS resources stored in OCR(Oracle Cluster Registry).
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Name some Oracle clusterware tools and their uses? OIFCFG - allocating and deallocating network interfaces OCRCONFIG - Command-line tool for managing Oracle Cluster Registry OCRDUMP - Identify the interconnect being used CVU - Cluster verification utility to get status of CRS resources What are the modes of deleting instances from ORacle Real Application cluster Databases? We can delete Assistant). instances using silent mode or interactive mode using DBCA(Database Configuration How do we remove ASM from a Oracle RAC environment? We need to stop and delete the instance in the node first in interactive or silent mode.After that asm can be removed using srvctl tool as follows: srvctl stop asm -n node_name srvctl remove asm -n node_name We can verify if ASM has been removed by issuing the following command: srvctl config asm -n node_name How do we verify that an instance has been removed from OCR after deleting an instance? Issue the following srvctl command: srvctl config database -d database_name cd CRS_HOME/bin ./crs_stat How do we verify an existing current backup of OCR? We can verify the current backup of OCR using the following command : ocrconfig -showbackup What are the performance views in an Oracle RAC environment? We have v$ views that are instance specific. In addition we have GV$ views called as global views that has an INST_ID column of numeric data type.GV$ views obtain information from individual V$ views. What are the types of connection load-balancing? There are two types of connection load-balancing:server-side load balancing and clientside load balancing. What is the differnece between server-side and client-side connection load balancing? Client-side balancing happens at client side where load balancing is done using listener.In case of server-side load balancing listener uses a load-balancing advisory to redirect connections to the instance providing best service. Give the usage of srvctl:srvctl start instance -d db_name -i "inst_name_list" [-o start_options]srvctl stop instance -d name -i "inst_name_list" [-o stop_options]srvctl stop instance -d orcl -i "orcl3,orcl4" -o immediatesrvctl start database -d name [-o start_options]srvctl stop database -d name [-o stop_options]srvctl start http://neworacledba.blogspot.com database -d orcl -o mount
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