Performing Database Failover with Oracle 11g Data Guard..
Performing Database Failover with Oracle 11g Data Guard. The Data Guard FAILOVER TO standby database command also offers an optional directive, IMMEDIATE, which instructs DGB to an immediate failover instead of a complete failover. B28295-03 Oracle Database 11g Data Guard Broker.Dataguard Multiple Standby Database configuration in Oracle 11g Release 2 18.104.22.168.0 on Linux RHEL 6.5 Environment This document explains the steps to configure Dataguard Multiple Standby Database in Oracle 11g Release 2 22.214.171.124.0 on Linux RHEL 6.5 Environment.ROLE TRANSITION BEST PRACTICES – DATA GUARD AND ACTIVE DATA GUARD. failover times with Oracle Database 11g Release 2 can be reduced to. broker's DGMGRL command-line interface to perform database switchover. Consider configuring multiple standby databases to maintain data protection.As per the Oracle Data Guard Broker manuals since Oracle Database 10g Release 2, see the Oracle Data Guard Broker 11g Release 2 11.2 section 2.2 for the current documentation, all Data Guard Broker configurations must have a specific static listener entry configured in the local listener of each instance in the Data Guard configuration for the Primary database and all standby databases. Data Guard Physical Standby Database Best Practices – Part 1 Oracle Data Guard is one of the software solutions provided by Oracle Corporation to maximize high availability of Oracle databases. Oracle Data Guard maintains one or many secondary databases as alternatives to the primary production database.Oracle's Data Guard is a well test and supported solution but it does not. In this series I cover the architecture, installation and configuration of Oracle Data Guard 11g. many virtual solutions VMware, HyperV, etc that you can setup and practice. Standby databases are in a continuous state of recovery, validating and.Thankfully, once an Oracle 11g Data Guard standby environment has been. Let's be honest Many organizations look upon a physical standby environment as a. Failover succeeded, new primary is "orcl_stdby1" DGMGRL show. in place if I'm following Oracle 11g's best practice recommendations.
Data Guard and Active Data Guard - Oracle
In my case, the following standby redo logs must be created on both servers. ALTER DATABASE ADD STANDBY LOGFILE THREAD 1 GROUP 10 SIZE 50M; ALTER DATABASE ADD STANDBY LOGFILE THREAD 1 GROUP 11 SIZE 50M; ALTER DATABASE ADD STANDBY LOGFILE THREAD 1 GROUP 12 SIZE 50M; ALTER DATABASE ADD STANDBY LOGFILE THREAD 1 GROUP 13 SIZE 50M; -- If Oracle Managed Files (OMF) is not used.ALTER DATABASE ADD STANDBY LOGFILE ('/u01/oradata/cdb1/standby_redo01.log') THREAD 1 GROUP 10 SIZE 50M; ALTER DATABASE ADD STANDBY LOGFILE ('/u01/oradata/cdb1/standby_redo02.log') THREAD 1 GROUP 11 SIZE 50M; ALTER DATABASE ADD STANDBY LOGFILE ('/u01/oradata/cdb1/standby_redo03.log') THREAD 1 GROUP 12 SIZE 50M; ALTER DATABASE ADD STANDBY LOGFILE ('/u01/oradata/cdb1/standby_redo04.log') THREAD 1 GROUP 13 SIZE 50M; Entries for the primary and standby databases are needed in the "$ORACLE_HOME/network/admin/tnsnames.ora" files on both servers. DGMGRL Since the standby database is now the primary database it should be backed up immediately.You can create these using the Network Configuration Utility (netca) or manually. Notice the use of the cdb1 = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = ol7-183-dg1)(PORT = 1521)) ) (CONNECT_DATA = (SID = cdb1) ) ) cdb1_stby = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = ol7-183-dg2)(PORT = 1521)) ) (CONNECT_DATA = (SID = cdb1) ) ) LISTENER = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = ol7-183-dg1)(PORT = 1521)) (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521)) ) ) SID_LIST_LISTENER = (SID_LIST = (SID_DESC = (GLOBAL_DBNAME = cdb1_DGMGRL) (ORACLE_HOME = /u01/app/oracle/product/18.0.0/db_1) (SID_NAME = cdb1) ) ) ADR_BASE_LISTENER = /u01/app/oracle The "$ORACLE_HOME/network/admin/listener.ora" file on the standby server contains the following configuration. The original primary database can now be configured as a standby. Online trading account malaysia. Innovators in multi-modal Biometric Identification and Verification. – Fingerprint, palmprint, iris. 20. Cluster with Data Guard Local and Remote Standby. Primary. Database. Primary Site. E.g. 10.2.0.4 bundle has backports of several Broker 11.1 features. Pre Data Guard 11.2 please refer to Client Failover Best Practices.Multi-standby Data Guard configuration and Redo Apply. Data Guard Fast-Start Failover with Oracle Data Guard broker for automatic. Best Practices for Data Guard 11g Release 2" from the MAA Best Practices area for Oracle Database at.Standby Server. On the standby database, run the ALTER DATABASE RECOVER MANAGED STANDBY DATABASE command to start redo USING CURRENT LOGFILE means the redo is applied as soon as it is received on the DISCONNECT option means the redo apply will run in background session.
Connect to both databases (primary and standby) and issue the following command. These roles can be altered at runtime without loss of data or resetting of redo logs. Switchover succeeded, new primary is "cdb1_stby" DGMGRL $ dgmgrl sys/Password1@cdb1_stby DGMGRL for Linux: Release 126.96.36.199.0 - Production on Sat Sep 1 2018 Version 188.8.131.52.0 Copyright (c) 1982, 2018, Oracle and/or its affiliates. An alternative is to enable flashback database on the primary (and the standby if desired) so in the event of a failover, the primary can be flashed back to the time before the failover and quickly converted to a standby database, as shown above.$ dgmgrl sys/Password1@cdb1 DGMGRL for Linux: Release 184.108.40.206.0 - Production on Sat Sep 1 2018 Version 220.127.116.11.0 Copyright (c) 1982, 2018, Oracle and/or its affiliates. This process is known as a Switchover and can be performed using the following commands. DGMGRL SWITCHOVER TO cdb1_stby; Performing switchover NOW, please wait... Operation requires start up of instance "cdb1" on database "cdb1" Starting instance "cdb1"... Once a standby database is configured, it can be opened in read-only mode to allow query access.Connect to the primary database (cdb1) and switchover to the standby database (cdb1_stby). Operation requires a connection to instance "cdb1" on database "cdb1_stby" Connecting to instance "cdb1"... This is often used to offload reporting to the standby server, thereby freeing up resources on the primary server. Snapshot Standby - Under 11g this can be automated using the DG broker. 11g. However, if you have many standby databases you may wish to tell other standby. See section 8.3.6 in Database High Availability Best Practices Guide 11.2.The LOG_ARCHIVE_CONFIG parameter enables or disables the sending of redo streams to the standby sites. The DB_UNIQUE_NAME of the primary database is dg1 and the DB_UNIQUE_NAME of the standby database is dg2. The primary database is configured to ship redo log stream to the standby database. In this example, the standby database service is dg2.Thousands of hours were spent on this book by many different people. 7 Standby database 8 Physical standby database 9 Logical standby. 120 Configuration file 121 Oracle Data Guard broker client-side components 121. The important details and best practices of Data Guard administration will be covered later on.
Oracle Data Guard Broker and Static Service Registration
We can use the cascaded standby database feature to say offload reporting from the primary database to the cascaded standby database with or without Active Data Guard or use the cascaded standby database along with the snapshot standby feature as a test environment in some cases where we need to test an urgent patch or fix and would like to.Oracle 10g Dataguard config with multiple physical standby databases. Lets assume this configuration with Oracle 10g version Case CHICAGO is destroyed. After activating NEW YORK as primary database and open resetlogs, is it possible to reinstate BOSTON as standby database without rebuilding that from NEW YORK backup.Data Guard Physical Standby Setup in Oracle Database 11g Release 2. Data Guard is the name for Oracle's standby database solution, used for disaster recovery and high availability. This article contains an updated version of the 9i physical standby setup method posted here. Multi-standby Data Guard configuration and Redo Apply. Data Guard Fast-Start Failover with Oracle Data Guard broker for automatic failure. For more information, see the MAA white paper "Client Failover Best Practices for Data Guard 11g.Oracle Data Guard for BeginnersProduct Manager for Database Tools. quality products 4 M c o m m u n i t y m e m b e r s sharing best practices 3, 5. in Oracle Database 11g Receives and applies redo while standby is open. Confidential38 Data Guard Broker Architecture Primary site Standby site 9.Short time Application testing - Snapshot standby database. ➢ Offloading RMAN backups. OCP v8i,9i,10g & 11g. MAA Best Practices. Presented by. Oracle 9i. • Zero data loss capabilities. • Data Guard broker. • Role switch Switchover/Failover. Multiple Far sync instance can be configured for active/passive purpose.
Oracle Data Guard Concepts and Administration 5 and the Oracle Data Guard Broker 6 documentation also provide valuable information. Multiple Standby Databases Best Practices Oracle Database 10g Release 2 Page 5The MAA white paper "Multiple Standby Databases Best Practices" at. Use the broker to create, manage, and monitor a Data Guard configuration. The benefits.Oracle Data Guard Failovers Best Practices. A failover is typically used only when the primary database becomes unavailable, and there is no possibility of restoring it to service within a reasonable period. During a failover the primary database is taken offline at one site and a standby database is brought online as the primary database. [[Oracle Data Guard maintains one or many secondary databases as alternatives to the primary production database.Oracle Data Guard supports both physical standby and logical standby sites.Note: It is recommended to apply all patches on the primary and the standby before setting up the Data Guard environment.
Data Guard Physical Standby Database Best Practices - Simple Talk
Primary Server: Step 1 Oracle Data Guard requires the primary database to be run in FORCE LOGGING mode.This means that statements using the NOLOGGING option will still generate redo information to maintain the Data Guard standby databases.The standby log files are required to store redo received from the primary database. Day trading charts. Standby redo logs must be equal or larger to the largest redo log file in the primary database.The standby redo log must have at least one more redo log group than the redo log on the primary database.It is recommended that the standby redo log is created on the primary database and propagated to the standby for any switch over or fail over operations. The LOG_ARCHIVE_CONFIG parameter enables or disables the sending of redo streams to the standby sites.
The DB_UNIQUE_NAME of the primary database is dg1 and the DB_UNIQUE_NAME of the standby database is dg2.The primary database is configured to ship redo log stream to the standby database.In this example, the standby database service is dg2. Next, STANDBY_FILE_MANAGEMENT is set to AUTO so that when Oracle files are added or dropped from the primary database, these changes are made to the standby databases automatically.The STANDBY_FILE_MANAGEMENT is only applicable to the physical standby databases.Setting the STANDBY_FILE_MANAGEMENT parameter to AUTO is is recommended when using Oracle Managed Files (OMF) on the primary database.
Next, the primary database must be running in ARCHIVELOG mode. Standby Server: Step 2 The Oracle database binaries have already been installed at this location ($ORACLE_HOME). The listener on the standby site must be configured with a static service entry for the standby database. In the next part of the document, we will create the standby database, verity the physical standby database.We will then configure the Broker, set up the Fast Start failover and the Data Guard Observer.The proper configuration of Oracle Data Guard Redo Apply and SQL Apply is essential to ensuring that all standby databases work properly and perform their roles within the necessary service levels after switchovers and failovers. The best practices for Oracle Data Guard build on the ones described in Section 2.2, "Configuring Oracle Database 11".You can configure most Oracle Data Guard settings using Oracle Enterprise Manager and the broker.To set more advanced, less frequently used configuration parameters, use the DGMGRL command-line interface or SQL*Plus statements.
Oracle Data Guard enables you to use a physical standby database (Redo Apply), a snapshot standby database, the Active Data Guard option (real-time query), or a logical standby database (SQL Apply), real-time apply, or a combination of these.In some situations, a business cannot afford to lose data at any cost.In other situations, the availability of the database might be more important than protecting data. Lite forex. Some applications require maximum database performance and can tolerate a potential loss of data if a disaster occurs.Based on your business requirements, choose one of the following protection modes: Bandwidth must be greater than the maximum redo generation rate.A guideline for two-way communication is for bandwidth to be 50% of the stated network capacity, but also consider the network usage of other applications.