Summarizing what we have read above, standby redo logs are different from online redo logs in the following ways:. So the best way to accomplish Oracle replication is based on redo logs, but Oracle makes you go through a lot of configuration changes to implement it. The concepts of redo logs are a must-have tool for an ETL engineer who is using Oracle as the source database. You can sidestep all these concepts and related configurations using a cloud-based ETL tool like Hevo.
It can set up Oracle replication in a matter of few clicks without using any custom code. It supports several target databases and can execute complex transformations on the fly using a simple user interface. You can also have a look at the unbeatable pricing that will help you choose the right plan for your business needs.
Share your experience of working with Oracle standby redo logs and online redo logs in the comment section below.
Your email address will not be published. You may use these HTML tags and attributes:. Save my name, email, and website in this browser for the next time I comment. Skip to content. The learning curve for Hevo is minimal and can be set up in minutes. Real-Time: Hevo offers real-time data migration. So, your data is always ready for analysis.
Secure: Hevo offers two-factor authentication and end-to-end encryption. Check Primary Redo Thread Number and size. Check Standby Thread number and Size for Standby redo logs. As you see standby is unassigned status means it is not used by standby database. Stop the data-guard recovery process in Standby database: -- for standby db which is under recovery, recovery needs to be stopped first alter database recover managed standby database cancel;. Later, in Section 3.
Step 2 Set initialization parameters on the physical standby database. Although most of the i n itialization parameter settings in the text initialization parameter file that you copied from the primary system are also appropriate for the physical standby database, some modifications need to be made. Example shows the portion of the standby initialization parameter file where values were modified for the physical standby database.
Parameter values that are different from Example and Example are shown in bold typeface. The parameters shown in Example are valid for the Boston database when it is running in either the primary or the standby database role.
If the values differ, redo transport services may be unable to transmit redo data from the primary database to the standby databases. The following table provides a brief explanation about the parameter settings shown in Example that have different settings from the primary database. If a switchover occurs and this instance becomes the primary database, then it will transmit redo data to the remote Chicago destination. Use an operating system copy utility to copy the following binary files from the primary system to the standby system:.
Stan dby control file created in Section 3. On platforms other than Windows, create a password file, and set the password for the SYS user to the same password used by the SYS user on the primary database.
The password for the SYS user on every database in a Data Guard configuration must be identical for redo transmission to succeed. Step 3 Configure listeners for the primary and standby databases. On both the primary and standby sites, use Oracle Net Manager to configure a listener for the respective databases.
To restart the listeners to pick up the new definitions , enter the following LSNRCTL utility commands on both the primary and standby systems:. On both the primary and standby systems, use Oracle Net Manager to create a network service name for the primary and standby databases that will be used by redo transport services.
The Oracle Net service name must resolve to a connect descriptor that uses the same protocol, host address, port, and service that you specified when you configured the listeners for the primary and standby databases.
The connect descriptor must also specify that a dedicated server be used. Step 5 Create a server parameter file for the standby database. On an idle standby database, use the SQL CREATE statement to create a server parameter file for the standby database from the text initialization parameter file that was edited in Step 2. Step 1 Start the physical standby database.
Step 2 S tart Redo Apply. See Section 6. Step 3 Test archival operations to the physical standby database. In this example, the tr ansmission of redo data to the remote standby location does not occur until after a log switch.
A log switch occurs, by default, when an online redo log file becomes full. Once you create the physical standby database and set up redo transport services, you may want to verify database modifications are being successfully transmitted from the primary database to the standby database. To see that redo data is being received on the standby database, you should first identify the existing archived redo log files on the standby database, force a log switch and archive a few online redo log files on the primary database, and then check the standby database again.
The following steps show how to perform these tasks. Step 1 Identify the existing archived redo log files. Step 2 Force a log switch to archive the current online redo log file. Step 3 Verify the new redo data was archived on the standby database.
Step 4 Verify new archived redo log files were applied. At this point, the physical standby database is running and can provide the maximum performance level of data protection. The following list describes additional preparations you can take on the physical standby database:. The Data Guard configuration is initially set up in the maximum performance mode the default.
Great post. Excelent post. Can we use standby redo log to recover the standby database if the Primary database server is not accessible so that we can recover till the last commited transaction. Western Australia has some amazing drives including Beverley to County Peak where you will drive through the Jarrah forests and the gorgeous landscapes of the Dale River. The man looked to his right, saw the doorbell button and pushed it several times.
Hi, The standby redo log files accidently got deleted from OS level. How can I recreate them. The DR site is otherwise working fine and primary archive logs are being applied properly.
0コメント