Oracle Real Application Clusters (RAC) is an option for Oracle Databases. It is a cluster database with a shared cache architecture that increases scalability and availability. Oracle RAC support is included in the Oracle Database Standard Edition and is an extra cost option for Enterprise Edition.

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Oracle RAC VIP issue

I have a two node RAC setup where my scan ips are registered in DNS and my public Ips are also registered in the dns. Now while connecting from my windows machine through oracle client in sql ...
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1answer
143 views

unable to connect to specific instance ORacle RAC

I did several operations by connecting successfully to all 4 instances but suddenly during one of the jobs, it failed with a TNS error. I checked the connect from SQL and one of the nodes is giving an ...
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30 views

Changing database parameters after removing a node from RAC oracle

Oracle 11.2.0.3 on SunOS 5.1 i have a client who is running a 2 node RAC environment but has shutdown the instance on one of the nodes. I was wondering whether after doing this they should change the ...
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1answer
326 views

changing Virtual IP interface names on RAC nodes - how to reconfigure

We are adding an extra interface on our nodes and we are going to bond these so the VIP interface will change from eth5 to bond3. Can someone point on documentation on what to do to reconfigure the ...
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1answer
96 views

Connect to Oracle RAC from SQL Developer?

We have set up RAC database on server. We can connect to database from sqlplus on the server using SCAN address. However, if I try to connect to RAC using SQL developer from client machine using SCAN ...
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1answer
63 views

Is catclust.sql really required? What is the importance

We are in a process of upgrading RAC Databases, and when validating the installed components, we saw that some of the databases aren't displaying the RAC component, but still the RAC works normally ...
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1answer
40 views

Oracle RAC 11g creation

I would like to play with RAC configuration. Using virtual area (VMware or VirtualBox): RAC1 (Windows 2003 Server) RAC2 (Windows 2003 Server) Shared storage (Openfiler) DNS server (for using SCAN ...
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3answers
5k views

Can't drop UNDO TABLESPACE

We have Oracle 11gR1 RAC two instances on two different servers, new undo tablespace UNDOTBS20140508 created 30G, I want to remove the old one UNDOTBSX02, I did the following: CREATE UNDO TABLESPACE ...
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1answer
174 views

What does node eviction mean in the Oracle RAC world?

Software environment: Oracle 12c with RAC running on RHEL The question might sound rather banal, but I wasn't able to find any word on this in the Oracle documentation I read thus far. By searching ...
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1answer
103 views

SCAN listener redirects connection to another port

I have setup RAC. I have two listeners LISTENER and LISTENER_DG. LISTENER is listening port 1521 LISTENER_DG is listening 1530 When client connects to the database using SHARED connection mode even ...
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0answers
82 views

From RAC to Standby RAC With Active Dataguard

I have oracle database 11.2.0.3 with RAC feature , with 2 node on oracle linux 6.4 : ol6-112-rac1 and ol6-112-rac2 I want to create active data guard with RAC feature from this database , these ...
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1answer
49 views

Oracle RAC: Can two transactions share an SCN?

Under what conditions (if any) can two transactions share an SCN? To put another way, is there a guarantee that if several DML statements share an SCN they are guaranteed to be part of the same ...
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2answers
81 views

Oracle import dmp file: ora exceptions

I'm trying to import a .dmp file to my oracle RAC database using the following command: C:\app\ptmp>impdp [user]/[password]@'DEVRAC-SCAN:1521/DB' DUMPFILE=UPG_E_7d291ff.dmp ...
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1answer
92 views

Could we delete old database and grid version?

We upgraded rac system and I want to ask, could I delete old grid and database version? [oracle@orcl1 app]$ cd 11.2.0.3/ 12.1.0.2/ Middleware/ oraInventory/ 11.2.0.4/ grid/ ...
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0answers
145 views

Oracle RAC Database software installation failing after successful Grid installation

2 node installation. Grid successfully installed. RAC DB software installation fails on node 2. Logs below: ****Oracle Services For Microsoft Transaction Server failed**** Node 1 (installation ...
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0answers
681 views

Oracle Grid installation failing on all nodes other than node where installation is started from

[Please forgive the untidy ctrl+v here as i am not able to preserve the formatting when i paste it here ) Folks, Any clues what I am doing wrong here ? Trying to install a 2-node RAC and as a ...
5
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2answers
6k views

Oracle RAC failover not working correctly

I have Oracle 11gR2 set up on a RAC environment with two nodes. I have SCAN set up, eg: I have two entries on the DNS set up so I can ping the SCAN name and reach either node. I can also ping both ...
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0answers
25 views

How can I debug this RAC IP issue?

I have a two node RAC database with 5 scan IPs. Issue is i'm able to ping all the scan ips from my database server whereas when I try to ping the same from my local pc, one of the scan ips is not ...
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0answers
167 views

Issues with SCAN IPs in Oracle RAC

I have 5 SCAN IPs running in my two node RAC database - 12c. Thing is that one scan listener is running in my node 1 and other listeners are running in node 2. When I try to ping the one scan listener ...
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0answers
198 views

Oracle 12c 2-node RAC, after first reboot CRS is hanging/stuck on octssd on the second node

My issue is with the Cluster Time Sync Service on the second node of an Oracle 12c RAC 2-node cluster on Oracle Linux. After the first reboot the second node is stuck on the octssd.bin process. I ...
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3answers
226 views

Is using ASM a pre-requisite for RAC?

I am about to build our first RAC development environment, and as I'm new to RAC and have not used ASM I wanted to keep things as simple as possible. I was under the impression that ASM is a ...
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0answers
154 views

Oracle Rac With Scan Error

I have installed Oracle RAC with ASM on Oracle Linux 5.8. My database version is 11.2.0.1. I have 2 node in my plan and all of them are active. I set scan in my DNS server but I can not connect to ...
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5answers
11k views

SQL Server equivalent to functionality of Oracle RAC? [closed]

I did some Googling and couldn't find an answer to this question more recent than a few years ago, so I thought I'd ask. Oracle's RAC feature offers load-balancing for both read and write ...
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1answer
2k views

Oracle 11gR2 RAC unable to connect to SCAN address [closed]

I'm having a problem with my RAC environment. I am using RedHat 6, Oracle 11.2.0.4 SE. Have a 2 node RAC setup using ASM. When connecting using SQL Developer, i can connect to my service ...
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1answer
884 views

Oracle RAC, unable to connect to node vip [closed]

I have a new oracle RAC installation running 11.2.0.4 on redhat 6. I can connect to sqlplus from a client using the node name but it is timing out when i use the node vip eg. first one works, second ...
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2answers
14k views

Oracleasm deletedisk failed Unable to clear disk

I have dropped the disk from ASM diskgroup: > ALTER DISKGROUP DATA01 DROP DISK DISK1; Oracle did a rebalance operation and then dropped the disk. Now, I want to delete the disk from ASM library ...
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1answer
2k views

2 Different Oracle DB Version on same server

Is it possible to install and run 2 different oracle version(11g and 12c)software and db on same server? is it possible then how we can? and if not then why? Thanks Rahul Joshi
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1answer
550 views

cluster_database TRUE/FALSE what does it mean in Oracle RAC?

I have 3 databases on an Oracle RAC (two nodes) one database which is running with CLUSTER_DATABASE=TRUE on both nodes, the other two runs on each node with CLUSTER_DATABASE=FALSE what does it mean ...
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1answer
106 views

Oracle: Am I on a RAC?

What query can I perform to determine if I am running on a RAC system? If I'm on a RAC, I need to query from GV$* rather than V$*.
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1answer
74 views

Oracle 10 RAC VIP returns non-VIP address for client

I am not a DB or even Oracle expert, but I wanted to understand when and why Oracle returns a different non-VIP address to the client, assuming this is correct behaviour? listener.ora LISTENER_DB-A ...
2
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0answers
138 views

Should an SCN obtained from one RAC node be immediately usable on other RAC nodes?

I'm seeing ORA-08181: specified number is not a valid system change number and don't understand why. The error happens around once a month from a process that runs every few minutes - so very rarely. ...
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1answer
32 views

Connecting to Standalone/RAC

I would like to know if SERVICE_NAME is always configured for a Oracle standalone and RAC setup or it's optional to set up. In my code I would like to connect to Database using SERVICE_NAME. But if ...
1
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1answer
153 views

Oracle RAC concept

This might be a dump question, but I've been reading so much different things, that I'm not sure anymore. I tried to understand the concept of the Oracle RAC, so I've been reading the datasheet form ...
0
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1answer
475 views

RAC, data guard, physical stand by and impdp

We're setting up a RAC 2 nodes data guard 11g environment, with a remote physical standby (2 nodes also) We receive the client's data he exports with expdp. We have imported his dump in the primary ...
0
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0answers
79 views

10.2.0.5 RAC instance running on Linux-64 recieved KEWRRFC: Remote Flush slave Failed, return code: 2

Last Friday one of two instances in our 10.2.0.5 RAC cluster was non-responsive after logging the following messages. We ended up rebooting the node and it came up successfully. While I will likely ...
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1answer
508 views

Slowness after migration to RAC 11gr2

we are getting slowness after migrate from ORacle 10gr2 single db to Oracle 11204 oracle rac (standard ed) with asm, on oracle solaris 11. at this momento we have only one node. In the next days we ...
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0answers
66 views

How to forwarding connection between 2 Oracle Database?

I have 2 Databases on independent 2 Linux server. I'm using Oracle 10G and 11G. I have this stage: client -> connect to Server A -> check Database A (check specific tablespace or database A is ...
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2answers
6k views

oracle active sessions waiting for scheduler

Load on my 11g RAC looks like this: and I don't understand how to get insight into what this "scheduler" wait class is. It seems like "scheduler" that it refers to is the process that runs ...
4
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1answer
545 views

Two different databases on the same RAC cluster

We have an Oracle 11gR2 RAC cluster with 4 nodes. 2 nodes are dedicated to one database that's devoted one application and 2 nodes are dedicated to a completely separate database that serves a ...
0
votes
1answer
2k views

determine redo log size, number of redo log files

Having 2 node RAC instance using ASM Log switches happening are too high about 100 per hour causing db to hang for few minutes sometimes GROUP# THREAD# MEMBER ...
1
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3answers
22k views

Shutdown one node in RAC

I want to shutdown one node in RAC. I did the following steps: Shutdown database instance export ORACLE_SID=mydb1 sqlplus / as sysdba shutdown immediate; shutdown ASM instance . oraenv +ASM1 ...
1
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1answer
1k views

Oracle RAC 11g R2 DB silent install: parameter needed for system class

I'm installing Oracle RAC DB 11gR2 using response file and silent mode. The installation is failing with the error message: [INS-35421] This options installs a single instance database only You ...
1
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2answers
2k views

oracle tablespace extending

While under massive write (insert and create table as) load, when Oracle RAC needs to extend tablespace, all write activity gets blocked for however long it takes it to finish extending (tens of ...
0
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1answer
493 views

Oracle cluster top activity class “cluster”

When under high load (many queries in parallel) our Oracle RAC gets in a state where most of the activity is reported as "cluster" by Enterprise Manager. It stays like that for 30 minutes to a couple ...
2
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2answers
6k views

Setting NLS params in logon trigger don't work in oracle 11g

We have a trigger setup so that when a specific user logs in, their NLS session parameters are modified. This used to work on Oracle 10g. We've just migrated to Oracle 11g RAC, and the session ...
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0answers
96 views

SYS_CONTEXT INSTANCE changing on failover?

When using Oracle RAC with either Fast Connection Failover or TAF (Transparent Application Failover), for a given database connection, is SYS_CONTEXT('USERENV', 'INSTANCE') going to change when ...
1
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1answer
15k views

Oracle 11gR2 archive log destinations

I want to add a second archive log destination to an Oracle 11gR2 RAC database with ASM, the idea is that I will then have some redundancy if the primary storage should fail. Archive log is already ...
3
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1answer
7k views

Add an additional listener to Oracle Database Appliance

After deployment of Oracle Database Appliance with OAK 2.3.0 the standard listeners are configured for the public network on bond0. That includes SCAN listeners and one VIP listener per node. This ...
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1answer
2k views

Network design considerations for Oracle Database Appliance

With the introduction of Oracle Engineered Systems the DBA is moved somewhat closer to infrastructure design decisions, and expected to at least have some opinions of the network design requirements ...
3
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1answer
1k views

Oracle RAC on Virtual machine

I have Oracle RAC on the very powerful servers and it can be said that these servers have extra memory,cpu and storage :) ...so my servers are much more powerful than it is needed. My manager and ...