PDF Successful Patterns for Outage Communication You can only use TSPITR on tablespaces whose data is completely segregated from the rest of the database. After opening the primary database with the RESETLOGS option, execute the queries shown in Table 12-12. Resolving Row and Transaction Inconsistencies, Resolving One or More Tablespace Inconsistencies. 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. Siebel, Peoplesoft, SAP, and other custom applications that include multiple databases are real world examples that may require global consistency across multiple databases. Recently when we found the cloud environments is not responding from time to time, seems like unplanned system outage for 10~15 minutes, but there is no any message or not even an "unplanned outage page" like before, after 10~15 minutes it then seems back to normal . Monitor the official status pages of all your vendors, SaaS, and tools, including Oracle CrowdTwist, and never miss an outage again. Flashback Database enables you to quickly return the database to an earlier point in time by undoing all of the changes that have taken place since that time. Oracle Database Backup and Recovery User's Guide for more information about performing time-based recovery, Oracle Database Administrator's Guide for information about how to handle in-doubt transactions and about recovery from distributed transaction failures, Oracle Enterprise Manager Oracle Site Guard Administrator's Guide, For an additional methodology for recovering multiple Oracle databases to a consistent state with local and distributed database transactions, see My Oracle Support Note 1096993.1. The second is an unplanned outage requiring an emergency failover that could arise from any number of things, including human error, hardware . EPBCS unplanned outage without any message like before In order to hide unplanned outages resulting from a component or If the standby site meets the prerequisites, then complete site failover is recommended for the following scenarios: Primary site disaster, such as natural disasters or malicious attacks, Use the Data Guard configuration best practices in Section 8.3, "General Data Guard Configuration Best Practices", Use Data Guard fast-start failover to automatically fail over to the standby database, with a recovery time objective (RTO) of less than 30 seconds (described in Section 8.5.2.3, "Fast-Start Failover Best Practices"). The following steps show how to approach the problem. After the switchover has completed and the application is available, resolve the fast recovery area disk group failure. Reference instructions listed in, Notification Contacts default to email subscription and the contact can set language, time-zone and subscription status using the link at the bottom of an outage notification. Sort out Data issues for example GIS related which impacts ABB outage management functionality. 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. Service Alert Email Administration - docs.oracle.com When the observer regains network access to the original primary database, it initiates a request for the broker to automatically reinstate it as a standby database to the new primary. Use Data Guard switchover or failover for data corruption or data failure when: The database is down or when the database is up but the application is unavailable because of data corruption or failure, and the time to restore and recover locally is long or unknown. My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts. DB_LOST_WRITE_PROTECT, Different levels of data and redo block corruption For this reason, if you are using Maximum Protection you should follow the MAA best practice of deploying two SYNC standby databases and multiple far sync instances if required. Orsted AS Unplanned Outage SSV4 A caching DNS server is used primarily for performance and fast response. The broker reinstates the database as a standby database of the same type (physical or logical) as the original standby database. 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. In addition, instructions are available for Unsubscribing from Service Notifications. The major third-party JDBC mid-tiers, such as IBM WebSphere, allow for the same This capability is referred to as Automatic Block Repair; Automatic Block Repair allows corrupt data blocks to be automatically repaired as soon as the corruption is detected. Application Continuity performs this recovery beneath the application so that the outage Oracle Database High Availability Overview, Oracle Data Guard Concepts and Administration, Oracle Real Application Clusters Administration and Deployment Guide, Oracle Clusterware Administration and Deployment Guide, Oracle Database Backup and Recovery User's Guide, Oracle Database Advanced Application Developer's Guide, Oracle Database PL/SQL Packages and Types Reference, you require a backup of the logical standby file and not a backup from the primary database, Chapter 13, "Reducing Downtime for Planned Maintenance", Section 12.2, "Recovering from Unscheduled Outages", Section 12.2.3, "Oracle RAC Recovery for Unscheduled Outages (for Node or Instance Failures)", Section 12.2.7.2, "Use Active Data Guard", Section 8.3, "General Data Guard Configuration Best Practices", Description of "Figure 12-1 Example Configuration With Far Sync", Description of "Figure 12-2 Network Routes Before Site Failover", Description of "Figure 12-3 Network Routes After Site Failover", Section 12.2.2.3, "Best Practices for Performing Manual Failover", Section 12.3.2, "Restoring a Standby Database After a Failover. 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. Recovery Manager (RMAN) automatic tablespace point-in-time recovery (TSPITR) enables you to quickly recover one or more tablespaces in a database to an earlier time without affecting the rest of the tablespaces and objects in the database. Ensuring that application services fail over quickly and automatically in an Oracle RAC clusteror between primary and secondary sitesis important when planning for both scheduled and unscheduled outages. For services, if the failed component is an . When following Oracle client failover best practices (point to chapter 10) in conjunction with Application Continuity applications will in most cases be able to seamless handle outages without seeing any errors. Copyright 2023, Oracle and/or its affiliates. The wide-area traffic manager can redirect traffic automatically if the primary site, or a specific application on the primary site, is not accessible. In an Oracle Data Guard configuration, you can configure services for client failover across sites. RECOVER MANAGED STANDBY DATABASE DISCONNECT; ALTER DATABASE START LOGICAL STANDBY APPLY; Verify redo transport services on the primary database. However, multiple disk failures in a storage array may be seen by Oracle ASM causing the disk group to go offline. After an Oracle RAC instance has been restored, additional steps might be required, depending on the current resource usage and system performance, the application configuration, and the network load balancing that has been implemented. before it can result in major data corruption. Flashback Transaction provides a way to roll back one or more transactions and their dependent transactions, while the database remains online. 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). Provide timely incident resolution. Service AdministratorA Service Administrator is someone who is responsible for administering the Cloud Service, managing Notification Contacts, and Service Administrator Access. If so, this cache must also be cleared so that DNS updates are recognized quickly. When a service restarts, FAN is published with UP status codes. With Flashback technology, the time to correct errors can be as short as the time it took to make the error. Work with Business to understand functional issues and solve the same by providing workaround. Requests are far more important than transactions because this allows the issued work to complete. Table 12-12 Queries to Determine RESETLOGS SCN and Current SCN OPEN RESETLOGS. For load-balancing application services across multiple Oracle RAC instances, Oracle Net connect-time failover and connection load balancing are recommended. PDF Sustaining Planned/Unplanned Database - Oracle After the failed instance has been repaired and restored to the state shown in Figure 12-9, some clients might have to be moved back to the restored instance. outage occurs. Client connections that started after the instance has been restored should automatically connect back to the original instance. When using vendor clusterware, there may be performance degradation while reconfiguration occurs to add a node back into the cluster. 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. Your next step depends on the message that you find in the log file, as described in following table: Recover or flash back all other databases in the distributed database system using change-based recovery, specifying the change number (SCN) that you recorded in Step 2. Figure 12-3 Network Routes After Site Failover. FAN is the first step to hiding outages. Therefore, the connections are automatically load-balanced over time. Once a contact has been added to the outage notifications in My Services, they can manage preferences using the link at the bottom of an outage notification. Perform these steps after one or more failed disks of one specific failure group have been dropped and must be replaced with new disks: Add the one or more replacement disks to the failed disk group with the following SQL command: A data area disk group failure should occur only when there have been multiple failures. Questions Building Blocks of High Availability (HA): Planned & Unplanned Universal Connection Pool (UCP) Fast Application Notification (FAN) Oracle Notification System (ONS) Fast Connection Failover (FCF) Transaction Guard (TG) Application Continuity (AC) Database request (unit of work) Logical Transaction ID (LTXID) Recoverable Errors Reinstatement restores high availability to the broker configuration so that, if the new primary database fails, another fast-start failover can occur. It also identifies the Oracle high availability When using only Oracle Clusterware, there is no impact when a node joins the cluster. For example, if a database must be recovered because of a media failure, then recover this database first using time-based recovery. Conditional Production Ready (SDM Action Required). This section provides the following topics that describe the steps needed to restore database fault tolerance: For Oracle Database 11g with Oracle RAC or Oracle RAC One Node, Restoring Failed Nodes or Instances in Oracle RAC and Oracle RAC One Node, For Oracle Database 11g with Data Guard and Oracle Database 11g with Oracle RAC and Data Guard - MAA, Restoring a Standby Database After a Failover, Restoring Oracle ASM Disk Groups after a Failure, Restoring Fault Tolerance After Planned Downtime on Secondary Site or Cluster, Restoring Fault Tolerance After a Standby Database Data Failure, Restoring Fault Tolerance After the Primary Database Was Opened Resetlogs, Restoring Fault Tolerance After Dual Failures. 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. 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. FAN is automatically handled for you by the client driver and by the Autonomous . Flashback Transaction Query enables you to examine changes to the database at the transaction level. Oracle security features (MAA recommended), Oracle Flashback Technology (MAA recommended), Fine-grained error investigation of incorrect results, Fine-grained and database-wide or pluggable database rewind For example: This statement displays each version of the row, each entry changed by a different transaction, between 2 and 3 p.m. on June 28, 2011. If an Oracle ASM disk group is configured as a normal or a high-redundancy type, then disk failure is handled transparently by Oracle ASM and the databases accessing the disk group are not affected. The FastStartFailoverAutoReinstate configuration property controls whether the observer should automatically reinstate the original primary after a fast-start failover occurred because a fast-start failover was initiated due to the primary database being isolated for longer than the number of seconds specified by the FastStartFailoverThreshold property. Box 7104, Pasadena, CA 91109-9835 II. See Overview of Application Additionally if the corruption is discovered on an Active Data Guard physical standby database the corruption is automatically repaired with a good block from the Primary. The recycle bin is a virtual container where all dropped objects reside. Notification Contacts are currently not able to set different delivery options per notification category; this will be available in a future release. Local backup only on standby database. If Oracle RAC instance is not available and ALTERNATE destination is available, then fail over to alternate destination. Not Production Ready (SDM Action Required). Similarly, multiple disk failures in different failure groups in a normal or high-redundancy disk group may cause the disk group to go offline. How do I manage my preferences?Once contacts are added to the outage notifications in My Services, they can manage their preferences using the link at the bottom of an outage notification. categorizes the session state usage as the application issues user calls. If you do not know who the Service Administrator is, log a Service Request (SR) via My Oracle Support. Not all sessions, in all cases, will check their connections into the pool. All: Comprehensive logical failures impacting an entire Section 5.3.2, "Regularly Back Up OCR to Tape or Offsite", Oracle Real Application Clusters Administration and Deployment Guide for information about Administering Storage in Real Application Clusters, Oracle Clusterware Administration and Deployment Guide for information about Restoring Oracle Cluster Registry, Oracle Clusterware Administration and Deployment Guide for information about Restoring Voting Disks. and data corruptions can definitely be isolated, A lost write that occurred on the primary database is Figure 12-8 shows what happens when one Oracle RAC instance fails. Overview of Unscheduled Outages Recovering from Unscheduled Outages Restoring Fault Tolerance for information about scheduled outages. You can use Enterprise Manager and the broker to monitor the Data Guard state. Once the failed Fast Recovery Area disk group comes back up or gets recreated, you must set the LOG_ARCHIVE_DEST_1 and the DB_RECOVERY_FILE_DEST location back to the original Fast Recovery Area disk group and transfer the archive logs and the flashback logs back to the Fast Recovery Area disk group. Solution Open the database in read-only mode to verify that it is in the correct state. consistency checks. See Section 12.3, "Restoring Fault Tolerance". Restore the local standby backup to the standby database. Fixing human errors that require rewinding the database, table, transaction, or row level changes to a previous point in time is easy and does not require any database or object restoration. After the Data Guard failover, the secondary site hosts the primary database. Preparing Your System for Planned Outages - Oracle After you have recovered the database and opened it with the RESETLOGS option, search the alert_SID.log of the database for the RESETLOGS message. 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. The FORCEFAILOVER option is available only in Oracle Database 12c Release 1 (12.1.0.2) and later. This chapter describes the Oracle operational best practices that can tolerate or manage each unscheduled outage type and minimize downtime. The Root Cause Analysis tab is displayed only for outages with RCA details published in Cloud Management Portal, under the Outage Tracking tab. Oracle Site Guard integrates with underlying replication mechanisms that synchronize primary and standby environments and protect mission critical data. Table 12-6 summarizes the Flashback solutions for outage varying in scope from destroying a row, such as through a bad update, to destroying a whole database (such as by deleting all the underlying files at the operating system level). In regular multi instance Oracle RAC environments, surviving instances automatically recover the failed instances and potentially aid in the automatic client failover. also help to improve overall performance, scalability, and manageability. Oracle Autonomous Database Serverless is engineered to return an application online following an unplanned outage or a planned maintenance activity within single-digit seconds. recoverable outages. Component: Indicates the component at the root of the problem. Responsibilities: Maintain the OMS system (ABB DMS), monitor its services and Integration. backups, Corruption Prevention, Detection, and Repair (MAA recommended), Database initialization settings such as Restore backup from the primary database. the Corrective Actions tab shows the corrective actions (CA) recommended by the Problem Management team, helping you plan corresponding changes into your roadmap. Figure 12-10 shows an example of the warning message that shows in Enterprise Manager when a reinstatement is needed. Why so many and why do they last so long? For more information, see "Data Guard Role Transition for Fast Recovery Area Disk Group Failure Local Recovery Steps". Footnote5Recovery times from human errors depend primarily on detection time. Client processes connect to the appropriate instance based on the service they require. Application Continuity runs during planned maintenance to failover those sessions that do not drain in the predefined drain interval (5 minutes on Autonomous Database ). Note the impact on your workload may The wide-area traffic manager selection of the secondary site can be automatic for an entire site failure. Existing connections on other instances remain usable, and new connections can be opened to these instances if needed. Five of 14 alerts are shown. Do not recover any of the other databases in the distributed system because this unnecessarily removes database changes. Flashback technologies are applicable only to repairing the following human errors: Erroneous or malicious update, delete, or insert transactions, Erroneous or malicious DROP TABLE statements, Erroneous or malicious batch job or wide-spread application errors. To do this you use the crsctl command. The connection pool automatically releases a connection at a request boundary. files. Table 12-1 Recovery Times and Steps for Unscheduled Outages on the Primary Site, Section 12.2.2, "Database Failover with a Standby Database", Section 12.2.1, "Complete Site Failover (Failover to Secondary Site)", Section 12.2.5, "Application Failover with Application Continuity and Transaction Guard". At this point, Oracle RAC Guard is operating in a non-resilient state, with the primary role on the former secondary node. described here in an easy to navigate matrix. For planned outages, the recommended approach is to drain requests over a controlled time period from FAN-enabled Oracle connection pools. For more information, see Section 5.2.7, "Mirror Oracle Cluster Registry (OCR) and Configure Multiple Voting Disks with Oracle ASM". See Oracle Data Guard Broker for complete information about how to perform a manual failover using Oracle Enterprise Manager. A failover operation is invoked when an unplanned failure occurs on the primary database and there is no possibility of recovering the primary database in a timely fashion. 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. You can use FAN callouts to report faults to your fault management system and to initiate repair jobs. and Oracle GoldenGate, ALL: Oracle Enterprise Manager for monitoring and primary, Allows small updates to be redirected to the primary For outages that require multiple recovery steps, the table includes links to the detailed descriptions in Section 12.2, "Recovering from Unscheduled Outages". See 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. Follow the steps in Section 12.2.6.3, "Data Area Disk Group Failure" or Section 12.2.6.4, "Fast Recovery Area Disk Group Failure". You have applied all the changes in the database and performed complete recovery. If you want to shut down only one instance of the database, but not the service, you can use the srvctl stop instance command with the -f parameter. The secondary site load balancer directs traffic to the secondary site middle-tier application server. application code changes, allowing Transparent Application Continuity to be Furthermore, Data Guard broker has a new PrimaryLostWriteAction property that helps automate specific actions whenever standby database detects that a lost write has occurred at the primary database. For example, you maintain logical databases in the Orders and Personnel tablespaces.

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