For instance or node failures with Oracle RAC and Oracle RAC One Node, use the following recovery methods: Automatic Instance Recovery for Failed Instances. Application transparency and failover are After the switchover has completed and the application is available, resolve the fast recovery area disk group failure. See Oracle Database Administrator's Guide, Manage automatically as described in Section 12.2.3, "Oracle RAC Recovery for Unscheduled Outages (for Node or Instance Failures)", Section 12.2.6, "Oracle ASM Recovery After Disk and Storage Failures", Section 12.2.7, "Recovering from Data Corruption", Possible no downtime with Oracle Active Data Guard: Section 12.2.7.2, "Use Active Data Guard", Possible no downtime with Active Data Guard: Section 12.2.7.2, "Use Active Data Guard". Resolving Row and Transaction Inconsistencies, Resolving One or More Tablespace Inconsistencies. The broker automatically restarts the log apply services. How do I know what my login credentials are for My Services?Oracle sends an Environment Access email (aka Welcome email) when a cloud service is activated which provides access to My Services in the Cloud Portal and the Fusion Application. duration, and is the sum of the Duration @ Oracle and Duration @ session states and transactional states. Thus, the service is provided by other instances in the cluster and processing continues. Unplanned Outage notification with no estimated end time Content Hi, As many EMEA Cloud Customers, I have received, on 15-Jan-2018 12:32 PM CET, a notification for an Unplanned Outage on IaaS services with a start date 1 hour before the notification and no end date. PDF Submitted April 28, 2006 - Oracle Generating Reports for Different Time Periods. Service AdministratorA Service Administrator is someone who is responsible for administering the Cloud Service, managing Notification Contacts, and Service Administrator Access. FAN notifications and service relocation enable automatic and fast redirection of clients if any failure or planned maintenance results in an Oracle RAC or Oracle Data Guard fail over. database and PDB that requires RMAN point in time recovery (PDB) or executing without knowing that any failure happened. Before Flashback technology, it took seconds to damage a database but from hours to days to recover it. Database Oracle Call Interface and ODP.NET based applications with support for Figure 12-4 Enterprise Manager Reports Disk Failures. we are having production outage in our environment for past 7 hours. With complete site failover, the database, the middle-tier application server, and all user connections fail over to a secondary site that is prepared to handle the production load. Dropping or deleting database objects by accident is a common mistake. For example: This statement shows all of the changes that resulted from this transaction. FAN Failover is the operation of transitioning one standby database to the role of primary database. Each instance services a different portion of the application (HR and Sales). For the Gold and Platinum reference architectures, zero data loss can be achieved over WAN by using Oracle 12c Far Sync instance. After instance failure, Oracle automatically uses the online redo log file to perform database recovery. Open the database in read-only mode to verify that it is in the correct state. Query the V$ARCHIVE_DEST and V$ARCHIVE_DEST_STATUS views: Verify that recovery is progressing on standby database. Important Note: Account Administrators in the previous Applications Services Notifications application are not automatically synched with Service Administrators in the Cloud Portal (My Services). we are seeing this unplanned outages quite often these days. Flashback Database is extremely fast and reduces recovery time from hours to minutes. Oracle Flashback technology revolutionizes data recovery. Analyze can conduct inter-object You have applied all the changes in the database and performed complete recovery. This notification is still ongoing, with absolutely no news, after 4 days. You should run all of these commands now. If you decide to perform a Data Guard failover then the recovery time objective (RTO) is expressed in terms of minutes or seconds, depending on the presence of the Data Guard observer process and fast-start failover. Service Administrators can add and remove contacts for receiving outage notifications per each environment (identity domain). If fast-start failover is not configured, then perform a manual failover. For example, the employees table and all its dependent objects would be undropped by the following statement: Oracle Flashback Transaction increases availability during logical recovery by easily and quickly backing out a specific transaction or set of transactions and their dependent transactions, while the database remains online. If instance B fails and CRS starts the HR service on C automatically, then when instance B is restarted, the HR service remains at instance C. CRS does not automatically relocate a service back to a preferred instance. It is common for some problems to be reported throughout the day. BIND 9.2.0 and 9.2.1: The entire cache can be flushed with the command rndc flush. Type of unavailability. wide spread corruptions or disasters, Zero or near zero with Recovery Appliance, GOLD: Active Data Guard Fast-Start Failover and Enabling Continuous Service for Applications, PLATINUM: Oracle GoldenGate replica with custom Figure 12-2 Network Routes Before Site Failover. Not Production Ready (SDM Action Required). For a physical standby database, verify that there are no errors from the managed recovery process and that the recovery has applied the redo from the archived redo log files: For a logical standby database, verify that there are no errors from the logical standby process and that the recovery has applied the redo from the archived redo logs: If you had to change the protection mode of the primary database from maximum protection to either maximum availability or maximum performance because of the standby database outage, then change the primary database protection mode back to maximum protection depending on your business requirements. The impact on current applications should be evaluated with a full test workload. If you are using UCP, then connections are automatically redistributed to the new node. If one Oracle RAC instance fails, new client connections are only accepted on the remaining instances that offers that service. 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. Retiring of Application Services NotificationsEffective 23 May 2016, all notifications and contacts will no longer be managed in the previous Application Services Notification area (Oracle Single-Sign-On login) and will be available in My Services. Data Recovery Advisor has both a command-line and GUI interface. Application Continuity performs this recovery beneath the application so that the outage This operation is fast because you do not have to restore the backups. Do not recover any of the other databases in the distributed system because this unnecessarily removes database changes. Follow the instructions listed in. You can use a Data Guard physical standby database to repair data file wide block corruption on the primary database by replacing the corrupted data files with good copies from the standby database. The considerations differ depending on whether the application services are partitioned, nonpartitioned, or are a combination of both. Client or application requests enter the secondary site at the client tier and follow the same path on the secondary site that they followed on the primary site. Therefore, the connections are automatically load-balanced over time. Automatic Block Repair reduces the amount of time that data is inaccessible due to block corruption and reduces block recovery time by using up-to-date good blocks in real-time, as opposed to retrieving blocks from disk or tape backups, or from Flashback logs. Figure 12-9 Nonpartitioned Oracle RAC Instances. Multiple disk failures are handled similarly, provided the failures affect only one failure group in an Oracle ASM disk group with normal redundancy. A combination of application best practice, simple configuration changes and an Oracle Database deployed using MAA best practices ensures that your applications are continuously available. and help enterprises maintain business continuity 24 hours a day, 7 days a week. You perform TSPITR by using the RMAN RECOVER TABLESPACE command. The Root Cause Analysis tab is displayed only for outages with RCA details published in Cloud Management Portal, under the Outage Tracking tab. View history of planned and unplanned outage notifications going forward Service Administrator: Access The initial Service Administrator is the contact who received the original environment access details. unplanned outages. Similarly, multiple disk failures in different failure groups in a normal or high-redundancy disk group may cause the disk group to go offline. PDF Sustaining Planned/Unplanned Database - Oracle Seconds to minutes if corruption due to lost writes and using Data Guard standby. Unplanned Outage on Production Cloud Customer Connect solutions, Oracle Data Guard and Enabling Continuous Service for Applications, Active-Active high availability (with conflict For Oracle RAC One Node configurations recover times are expected to take longer than full Oracle RAC; with Oracle RAC One Node a replacement instance must be started first before it can do the instance recovery. If you want to receive announcements through email or another delivery mechanism, you can manage tenancy administrator email preferences or configure announcement subscriptions. Shut down the affected database and continue by using the instructions in the Local Recovery Steps to resolve the Oracle ASM disk group failure. Restore backup from the primary database. When Application Continuity is configured, an end-user request is executed at-most once; replay is started if the time has not exceeded the replay timeout attribute specified for the service. Query the erroneous transaction and the scope of its effect. For example, when a node or instance is restored and available to start receiving connections, a manual step might be required to include the restored node or instance in the hardware-based load balancer logic, whereas Oracle Net Services does not require manual reconfiguration. Section 8.5.2.3, "Fast-Start Failover Best Practices", Follow the configuration best practices outlined in Section 8.5.2.4, "Manual Failover Best Practices.". Data Recovery Advisor enables you to perform restore operations and recovery procedures or use Flashback Database as follows: Perform block media recovery of data files that have corrupted blocks, Perform point-in-time recovery of the database or selected tablespaces, Rewind the entire database with Flashback Database, Completely restore and recover the database from a backup. Oracle Corporation is an American multinational computer technology corporation headquartered in Austin, Texas. Flashback Drop provides a way to restore accidentally dropped tables. You may use Oracle GoldenGate in place of Data Guard for these requirements. Reinstatement restores high availability to the broker configuration so that, if the new primary database fails, another fast-start failover can occur. flashback pluggable database, Database unusable, system, site or storage failures, For example, If fast-start failover is enabled (in either maximum performance or maximum availability mode, and the Data Guard broker PrimaryLostWriteAction is set to FORCEFAILOVER, then the observer initiates a failover. If the disk failure is temporary, then you can restart Oracle ASM and the database instances and crash recovery occurs after the disk group is brought back online. Component: Indicates the component at the root of the problem. You can assign services to one or more instances in an administrator-managed Oracle RAC database or to server pools in a policy-managed database. To do this you use the crsctl command. Service reliability is achieved by configuring and failing over among the surviving instances. Dbverify and Analyze conduct physical block and Flashback Version Query enables the database administrator to track down the source of a logical corruption in the database and correct it. You have successfully performed an incomplete recovery. Restoring the high availability architecture to full fault tolerance to reestablish full Oracle RAC, Data Guard, or MAA protection requires repairing the failed component. In addition, you can route new client connections for the Sales service to the instance now supporting this service. Implementing the optimal techniques to prevent and prepare for data corruptions can save time, effort, and stress when dealing with the possible consequences-lost data and downtime. Oracle Data Guard Concepts and Administration.for a complete description of failover processing, The "Data Guard Fast-Start Failover" and "Data Guard Switchover and Failover" MAA best practice white papers available from the MAA Best Practices area for Oracle Database at. Notification of failures using fast application notification (FAN) events occur at various levels within the Oracle Server architecture. Whatever method you use to recover corrupted blocks, you first must analyze the type and degree of corruption to perform the recovery. 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. On the primary database, use the following query to obtain the value of the system change number (SCN) that is 2 SCNs before the RESETLOGS operation occurred on the primary database: Determine the target SCN for flashback operation at the logical standby: Flash back the logical standby to the TARGET_SCN returned. If the primary database corruption is widespread due to a bad controller or other hardware or software problem, then you may want to failover or switchover to the standby database while repairs to the primary database server are made. Figure 12-6 shows Enterprise Manager reporting a pending REBAL operation on the DATA disk group. The caching server obtains information from an authoritative DNS server in response to a host query and then saves (caches) the data locally. architectures. If a hardware failure occurs and the failure adversely affects an Oracle RAC database instance, then depending on the configuration, Oracle Clusterware does one the following: Oracle Clusterware automatically moves any services on the failed database instance to another available instance, as configured with DBCA or Enterprise Manager. If you want to prevent automatic reinstatement (for example, to perform diagnostic or repair work after failover has completed), set the FastStartFailoverAutoReinstate configuration property to FALSE. For a fast local restart, perform the following steps on the primary database: Change the CONTROL_FILES initialization parameter to specify only the members in the Data Area: Change local archive destinations and the fast recovery area to the local redundant, scalable destination: Start the database with the new settings: Drop the redo log members that were in the lost disk group. Standby databases do not have to be re-created if you use the Oracle Flashback Database feature. Figure 12-2 illustrates the possible network routes before site failover: Client requests enter the client tier of the primary site and travel by the WAN traffic manager. Location: On the Availability List view () at Customer and Service Level. For more information, see "Recovery for Global Consistency in an Oracle Distributed Database Environment ", in My Oracle Support Note 1096993.1 at, https://support.oracle.com/CSP/main/article?cmd=show&type=NOT&id=1096993.1. A few years ago Spectrum acquired Time Warner Cable. If the configuration uses Oracle Data Guard and fast-start failover is enabled, a database failover is triggered automatically and clients automatically reconnect to the new primary database after the failover completes. Table 12-7 summarizes each Flashback feature. If one database in a distributed database environment requires recovery to an earlier time, it is often necessary to recover all other databases in the configuration to the same point in time when global data consistency is required by the application. Deploy IBM Sterling Order Management Software in a Virtual Machine on On Autonomous Database FAN for planned With Oracle Data Guard, you can automate the failover process using the broker and fast-start failover, or you can perform the failover manually: Fast-start failover eliminates the uncertainty of a process that requires manual intervention and automatically executes a zero loss or minimum-loss failover (that you configure using the FastStartFailoverLagLimit property) within seconds of an outage being detected. Figure 12-8 shows what happens when one Oracle RAC instance fails. outage occurs. Oracle Database High Availability Solutions for Unplanned Downtime However, if a manual failover occurs and not all data is available on the standby site, then data loss might result. behavior when configured with UCP. Five of 14 alerts are shown. This download feature is planned to migrate to My Services in the summer of 2016. Users soon realize their mistake, but by then it is too late and there has been no way to easily recover the dropped tables and its indexes, constraints, and triggers. Clear affected records from caching DNS servers. I have a problem with Oracle Cloud Oracle Cloud outages reported in the last 24 hours This chart shows a view of problem reports submitted in the past 24 hours compared to the typical volume of reports by time of day. Following unplanned downtime on a primary database that requires a failover, full fault tolerance is compromised until the standby database is reestablished. In regular multi instance Oracle RAC environments, surviving instances automatically recover the failed instances and potentially aid in the automatic client failover. Use this feature to view and reconstruct data that might have been deleted or changed by accident. An incorrect batch job or DML statement corrupts the data in only one tablespace. A failover operation typically occurs in seconds to minutes, and with little or no data loss.