What is OCR and Votedisk?

The voting disk is a file that manages information about node membership, and the OCR is a file that manages the cluster and Real Application Clusters (RAC) database configuration information.

What is OCR in RAC?

Oracle Cluster Registry (OCR) The OCR contains cluster and database configuration information for RAC and Cluster Ready Services (CRS) such as the cluster node list, and cluster database instances to node mapping, and CRS application resource profiles. The OCR is a shared file located in a cluster file system.

What is OCR and OLR?

Oracle Cluster Registry (OCR) and Oracle Local Registry (OLR) are two very important components of a Grid Infrastructure that help manage the cluster resources. In a nutshell, OCR is used by CRSd and OLR by the OHASd.

What is OCR in ASM?

OCR manages Oracle Clusterware and Oracle RAC database configuration information. OLR resides on every node in the cluster and manages Oracle Clusterware configuration information for each particular node.

Where do I find my OCR and voting disk?

For Oracle RAC 10g Release 1

1. stop the CRS stack on all nodes using “init.crs stop”
2. Edit /var/opt/oracle/ocr.loc on all nodes and set up ocrconfig_loc=new OCR device.
3. Restore from one of the automatic physical backups using ocrconfig -restore.
4. Run ocrcheck to verify.
5. reboot to restart the CRS stack.

What OLR, OCR and Voting Disk in Oracle RAC? || Node Eviction and Node Eviction - Master and Slave

How do I restore my OCR and voting disk?

Use the following steps to restore the voting disk from the OCR backup.

1. Step 1: Disable the CRS automatic start service. ...
2. Step 2: Restart the node. ...
3. Step 3: Verify that the CSR service did not start. ...
4. Step 4: Clear the header of the voting disk. ...
5. Step 5: Start the cluster. ...
6. Step 6: Start the ASM with a PFILE.

What is voting disk in Oracle?

- Voting disk is a file in which all the nodes of a cluster register their heartbeat information. - It also contains the list of the active nodes. - Voting disks or files are like attendance registers where nodes mark their attendance (heartbeats) to confirm they are alive.

What is scan IP and VIP in Oracle RAC?

SCAN virtual IP addresses (VIPs) function like node VIPs. However, unlike node VIPs, SCAN VIPs can run on any node in the cluster. Clients (users or applications) that connect using a SCAN instead of a node VIP name or address do not have to update the list of node names or addresses in their local tnsnames.

What is an OCR code?

OCR (optical character recognition) is the use of technology to distinguish printed or handwritten text characters inside digital images of physical documents, such as a scanned paper document.

Why is OLR needed?

ORACLE LOCAL REGISTRY(OLR) contains node-specific information required by OHASD . Every node has its own dedicated OLR file. (not shared between the nodes). As OCRs files are present in ASM diskgroup, While starting the CRS, it wont be able to Access OCR file to find the cluster resource information.

What is the purpose of OLR?

OLR is an operating system file which resides on every node in the cluster and manages Oracle Clusterware configuration information for each particular node. It contains manageability information about Oracle Clusterware, including dependencies between various services.

What is the location of OLR?

The OLR file is located in the grid_home/cdata/. olr . The location of OLR is stored in /etc/oracle/olr. loc.

What is GCS and GES in RAC?

The GCS and GES are integrated components of Real Application Clusters that coordinate simultaneous access to the shared database and to shared resources within the database and database cache. GES and GCS together maintain a Global Resource Directory (GRD) to record information about resources and enqueues.

Where can I find OCR in RAC?

OCR config file "/etc/oracle/ocr. loc" check successful Disk group for ocr location "+DATA" is available on all the nodes Checking OCR backup location "/u01/app/12.1. 0.2/grid/cdata/racscan" OCR backup location "/u01/app/12.1.

How do I start a CRS?

The basic steps to start the CRS include these startup actions:.

1. Enable the crs, css, and evm daemons in /etc/inittab.
2. Execute /etc/init.d/init.crs enable.
3. Execute /etc/init.d/init.crs start.
4. Execute $ORA_CRS_HOME/bin/crsctl start crs.

How does an OCR work?

An OCR program extracts and repurposes data from scanned documents, camera images and image-only pdfs. OCR software singles out letters on the image, puts them into words and then puts the words into sentences, thus enabling access to and editing of the original content.

How do I OCR a PDF?

Open a PDF file containing a scanned image in Acrobat for Mac or PC. Click on the “Edit PDF” tool in the right pane. Acrobat automatically applies optical character recognition (OCR) to your document and converts it to a fully editable copy of your PDF. Click the text element you wish to edit and start typing.

What is OEM and PSM in Tesseract?

The --oem argument, or OCR Engine Mode, controls the type of algorithm used by Tesseract. The --psm controls the automatic Page Segmentation Mode used by Tesseract.

Why are there 3 SCAN listeners in Oracle RAC?

It reduces connectivity time for application or web based end users. Normally 3 SCANs are capable enough to handle hundreds of new connections in a span of few seconds. Still if you feel that default 3 SCAN listeners are not enough for your environment then you have an option to add few more scan listeners.

Why does Oracle RAC have 3 SCAN?

As we know that the recommended value for SCAN ip using DNS/GNS is 3 SCAN IPS and this creates 3 SCan listeners randomly on the nodes. If we have a 5 node cluster then how many SCAN IPs are recommended.

What is DNS in Oracle RAC?

This article explains the steps to configure a Domain Name System (DNS) on Oracle Linux 7u5, which contains the resolution hosts of the VIP and SCAN virtual network for Oracle Database RAC .

What is node eviction in Oracle RAC?

A node eviction is done when a heartbeat indicates that a node is not responding, and the evicted node is re-started so that it can continue to partiipate in the cluster. Reason for RAC node evictions. There are many reasons for a RAC node eviction.

How many voting discs are there?

- The voting disk is used to arbitrate in cases where the old master has crashed. - You must have an odd number of voting disks. For high availability, Oracle recommends that you have a minimum of three voting disks.

What is quorum disk Oracle?

The Quorum Disk Manager utility is a new feature in Oracle SuperCluster release 2.3. Using this utility, you can create an iSCSI quorum disk on two of the database domains and store a voting file on those two quorum disks.