With DB_LOST_WRITE_PROTECT Exadata provides implicit HARD enabled checks to prevent data You must reinstate the original primary database as a new standby database to restore fault tolerance of the configuration. This is more efficient for everyone - and allows the IT team to focus on the work they need to do. I have created an SR with Oracle and waiting upon for their response. When one or more disks fail in a normal or high redundancy disk group, and the Oracle ASM disk group is accessible, there is no loss of data and no immediate loss of accessibility. standby, provides end-to-end data protection for backups, Physical block corruptions detected by Oracle at a Application Continuity masks outages from end users and applications You may have to stop database instances for many reasons, such as upgrading the Oracle software, patching, and replacing hardware. of work before maintenance. When using only Oracle Clusterware, there is no impact when a node joins the cluster. RECOVER MANAGED STANDBY DATABASE DISCONNECT; ALTER DATABASE START LOGICAL STANDBY APPLY; Verify redo transport services on the primary database. Table 4-1 Outage Types and Oracle High For example, if the data area disk group is defined as external redundancy, a single-disk failure should not be exposed to Oracle ASM. Connections are started as they are needed, on the least-used node, assuming connection load balancing has been configured. We are pleased to announce the availability of enhanced notifications for your Applications Cloud Service in the Cloud Portal. The Notification Contacts are added and managed by the Service Administrator.As a Notification Contact you will now be able to take advantage of the following new features: You can access these features from the Preferences link at the bottom of the notification email that you receive. pluggable database (PDB), entire multitenant container database All that is left to do is to describe to the email toolkit the . enabled for your applications. Overview, Oracle Active To see data for a different period of time, use the page time selector in the upper right corner, as explained in the Generating Reports for Different Time Periods section in Working with Oracle Pulse. Recovering locally takes longer than the business service-level agreement or RTO. Using any FAN-aware pool with Fast Connection Failover configured (such as OCI session pools, Universal Connection Pool, Oracle WebLogic Server Active GridLink for Oracle RAC, or ODP.NET) allows sessions to drain at request boundaries after receipt of the FAN planned DOWN event. possible. we are having production outage in our environment for past 7 hours. When Oracle ASM disks fail, use the following recovery methods: Using Enterprise Manager to Repair Oracle ASM Disk Failure, Using SQL to Add Replacement Disks Back to the Disk Group. Overview of Unscheduled Outages Recovering from Unscheduled Outages Restoring Fault Tolerance for information about scheduled outages. If one Oracle RAC instance fails, then the service and existing client connections can be automatically failed over to another Oracle RAC instance. If configured as Oracle RAC Far Sync, then fail over to available instance or node. In this scenario, the site failover is accomplished by an automatic domain name system (DNS) failover. Global consistency between the participating databases may be expected and crucial to the application. Wide-spread block corruptions (physical or logical) or lost writes likely indicate a significant hardware issue at the primary site. Flashback Table performs this operation online and in place, and it maintains referential integrity constraints between the tables. FAN events can occur at various levels within the Oracle Database architecture and are published through Oracle Notification Service and Oracle Streams Advanced Queuing for backward compatibility with previous OCI clients. Consequently, sessions in progress during an outage might not fail over until the cache timeout expires. Issue the SHUTDOWN IMMEDIATE statement, if necessary. If you decide to perform local recovery then you must perform a fast local restart to start the primary database after removing the controlfile member that is located in the fast recovery area from the init.ora and allocate another disk group as the fast recovery area for archiving. The temporary login for both of these systems is the same username and password. Flashback technologies cannot be used for media or data corruption such as block corruption, bad disks, or file deletions. For example, the pfile would look something like: Restart the database instance with the restored spfile. delays or unnecessary node evictions. Clear affected records from caching DNS servers. When multiple instances fail, if one instance survives Oracle RAC performs instance recovery for any other instances that fail. If the primary database is activated because it was flashed back to correct a logical error or because it was restored and recovered to a point in time, then the corresponding standby database might require additional maintenance. physical block corruptions, Does periodic backup validation that helps ensure that See Oracle Real Application Clusters Administration and Deployment Guide "Administering Services" for more information. Thus, with Automatic Block Repair you use an Oracle Active Data Guard standby database for automatic repair of data corruptions detected by the primary database. Oracle Corporation is an American multinational computer technology corporation headquartered in Austin, Texas. Restore backup from the primary database. Goal In times of unplanned outages a database enables production personnel to enter the estimated outage time and the reduced production rate of the plant during this period. Oracle provides the following statements to help resolve table inconsistencies: Flashback Table statement to restore a table to a previous point in the database, Flashback Drop statement to recover from an accidental DROP TABLE statement, Flashback Transaction statement to roll back one or more transactions and their dependent transactions, while the database remains online. Thanks Mansur Aulam Tagged: Compliance Configuration Core HR Security Upgrades Documentation To view full details, sign in. The secondary site load balancer directs traffic to the secondary site middle-tier application server. Applies to: Oracle Network Management for Utilities - DMS - Version 1.12.0.3 and later Oracle Utilities Network Management System - Version 1.12.0.3 and later in-flight work. Note the impact on your workload may categorizes the session state usage as the application issues user calls. Once the files are restored on the primary database, data file or tablespace recovery makes the data files consistent with the rest of the database. The recovery process begins when you either suspect or discover a block corruption (for example: ORA-1578, ORA-752, ORA-600 [3020], and ORA-753). If one Oracle RAC instance fails, new client connections are only accepted on the remaining instances that offers that service. Flashback Transaction Query provides a way to view changes made to the database at the transaction level. In this case a failover to a standby database might be the most prudent course of action in order to maintain availability and minimize potential data loss. In general, the recovery time when using Flashback technologies is equivalent to the time it takes to cause the human error plus the time it takes to detect the human error. For administrator-managed Oracle RAC One Node databases, you must monitor the candidate node list and make sure a server is always available for failover, if possible. Footnote5Recovery times from human errors depend primarily on detection time. On a second or subsequent request for the same data, the caching DNS server responds with its locally stored data (the cache) until the time-to-live (TTL) value of the response expires. One or more Oracle ASM disks fail, and data area disk group goes offline, Databases accessing the data area disk group shut down, Perform Data Guard failover or local recovery as described in Section 12.2.6.3, "Data Area Disk Group Failure", One or more Oracle ASM disks fail, and the fast recovery area disk group goes offline, Databases accessing the fast recovery area disk group shut down, Perform local recovery or Data Guard failover as described in Section 12.2.6.4, "Fast Recovery Area Disk Group Failure". After a failed node has been brought back into the cluster and its instance has been started, Cluster Ready Services (CRS) automatically manages the virtual IP address used for the node and the services supported by that instance automatically. Zero unless corruption due to lost writes, PLATINUM: Comprehensive corruption protection and Auto Block Repair Availability Solutions for Unplanned Downtime, Oracle Data Guard and Enabling Continuous Service for Applications (MAA recommended), Integrated client and application failover, Fastest and simplest database replication, Zero data loss by eliminating propagation delay, Flexible logical replication solution (target is open The caching server obtains information from an authoritative DNS server in response to a host query and then saves (caches) the data locally. (The database must be mounted to perform a Flashback Database.). A service will be made available by multiple database instances to provide a service that is needed. A database can be recovered to 2:05 p.m. by issuing a single statement. No action is necessary unless the load must be rebalanced, because restoring the instance means that the load there is low. Therefore, over time, as older connections disconnect and new sessions connect to the restored instance, the client load evenly balances again across all available Oracle RAC instances. consistency checks. MAA best practices provide a step-by-step process for resolving most corruptions and stray or lost writes, including the following: For more information see the "Preventing, Detecting, and Repairing Block Corruption: Database 11g" MAA white paper from the MAA Best Practices area for Oracle Database at, See, "Best Practices for Corruption Detection, Prevention, and Automatic Repair - in a Data Guard Configuration" in My Oracle Support Note 1302539.1 at, https://support.oracle.com/CSP/main/article?cmd=show&type=NOT&id=1302539.1. Oracle Data Guard Broker for more information about "Application Initiated Fast-Start Failover", The topic, "Oracle Active Data Guard and Oracle GoldenGate" for additional discussion of the trade-offs between physical and logical replication at, http://www.oracle.com/technetwork/database/features/availability/dataguardgoldengate-096557.html. Event Stop. In some cases, an automatic reinstatement might not be wanted until further diagnostic or recovery work is done. However, there might be limitations in distinguishing separate application services (which is understood by Oracle Net Services) and restoring an instance or a node. This does mean some in-flight database transactions could be lost in the event of a catastrophic unplanned outage, but Oracle has its own mechanisms for dealing with this and rolling back uncommitted . The impact on current applications is usually minimal, but it should be evaluated with a full test workload. After a site failure in a Data Guard configuration, the new primary database can automatically publish the production service while notifying affected clients, through FAN events, that the services are no longer available on the failed primary database. files. However, multiple disk failures in a storage array may affect Oracle ASM and cause the disk group to go offline. Oracle Database Advanced Application Developer's Guide for information about Using Flashback Transaction, DBMS_FLASHBACK.TRANSACTION_BACKOUT() in Oracle Database PL/SQL Packages and Types Reference. A fast recovery area disk group failure typically occurs only when there have been multiple failures. CRS notifies the applications that the HR service is again available on instance B. Oracle RAC One Node databases are administered slightly differently from Oracle RAC or single-instance databases. Click the Export icon () in the upper right corner to export data, as explained in the Exporting Data section in Working with Oracle Pulse. failover those sessions that do not drain in the predefined drain interval (5 minutes on For example, if a database must be recovered because of a media failure, then recover this database first using time-based recovery. A failover operation typically occurs in seconds to minutes, and with little or no data loss. Service Administrator: Setting Notification PreferencesAs a Service Administrator, you can set your language, time zone, and default notification preferences from the Preferences link in the upper right corner of the My Services dashboard. before it can result in major data corruption. Application Continuity provides continuous service for those requests that do not complete within the allotted time. It can also be triggered manually to switch to the secondary site for switchovers. BILLING INFORMATION (HEAD OF HOUSEHOLD ONLY) III. You can flash back the primary database to a point before the tablespace was dropped and then restore a backup of the corresponding data files using SET NEWNAME from the affected tablespace and recover to a time before the tablespace was dropped. This document is intended to provide information to Customers, Implementation partners on unplanned outages that they may experience with their Oracle Retail Cloud Service (s) and what to expect during and after an outage incident. and alerts you when those SLAs cannot be met with your Box 7104, Pasadena, CA 91109-9835 II. Unit of measurement. Five of 14 alerts are shown. When replay succeeds, this feature masks applications from transient outages (such as session failure, instance or node outages, network failures, and so on) and from planned outages such as repairs, configuration changes, and patch application. In addition, he instructed his staff to reset the salary to the previous level of $1250. Data Guard Fast Start failover. Duration @ Customer (Minutes): Indicates the time Detects and fixes bad sectors. Failover is the operation of transitioning one standby database to the role of primary database. Table 12-3 summarizes the impacts and recommended repairs for various Oracle ASM failure types. Complete Site Failover (Failover to Secondary Site), Database Failover with a Standby Database, Oracle RAC Recovery for Unscheduled Outages (for Node or Instance Failures), Application Failover with Application Continuity and Transaction Guard, Oracle ASM Recovery After Disk and Storage Failures, Recovering from Human Error (Recovery with Flashback), Recovering Databases in a Distributed Environment. and transactional state so the database session can be recovered following The number of corrective actions (CA) suggested for each outage type. Service AdministratorA Service Administrator is someone who is responsible for administering the Cloud Service, managing Notification Contacts, and Service Administrator Access.