About of Database Systems and Information Technologies
Oracle Data Guard ensures high availability, data protection, and disaster recovery for enterprise data. Oracle Data Guard provides a comprehensive set of services that create, maintain, manage, and monitor one or more standby databases to enable production Oracle databases to survive disasters and data corruptions. Oracle Data Guard maintains these standby databases as copies of…
Oracle Data Guard ensures high availability, data protection, and disaster recovery for enterprise data. Oracle Data Guard provides a comprehensive set of services that create, maintain, manage, and monitor one or more standby databases to enable production Oracle databases to survive disasters and data corruptions. Oracle Data Guard maintains these standby databases as copies of…
Oracle database is most used rdbms database system. I will mention how install oracle database 19c version on Oracle Linux 8 operating system. Also, I will apply Oracle 19.22 release update patch after 19c installation. I am using VMware virtualization to infrastructure. Operating system is Oracle Linux 8.9. First Step : Configure Operation System For…
Oracle Data Guard ensures high availability, data protection, and disaster recovery for enterprise data. Oracle Data Guard provides a comprehensive set of services that create, maintain, manage, and monitor one or more standby databases to enable production Oracle databases to survive disasters and data corruptions. Oracle Data Guard maintains these standby databases as copies of…
Oracle Real Application Clusters (RAC) provides high availability (HA) and scalability to the Oracle Database without requiring any application changes. Oracle RAC allows multiple instances running on different servers to access the same physical database stored on shared storage. Database spans multiple hardware systems and yet appears as a single unified database to the application….
Oracle Data Guard ensures high availability, data protection, and disaster recovery for enterprise data. Oracle Data Guard provides a comprehensive set of services that create, maintain, manage, and monitor one or more standby databases to enable production Oracle databases to survive disasters and data corruptions. Oracle Data Guard maintains these standby databases as copies of…
I installed Oracle 12c Data Guard, everything was okey. But, I got an error like below when I wanted to connect data guard database with Toad or SQL Developer. tnsping was okey. Error SQL Developer : Status : Failure -Test failed: IO Error: Got minus one from a read call Listener.log 10-OCT-2017 15:01:16 * (CONNECT_DATA=(CID=(PROGRAM=SQL…
Sometimes, you may need to change redo log size to perform optimum size for performance. If you want to change redo log size of both standby side and primary side, you can use below commands. Current Status Of Redo Logs Primary Side SQL> select group#,sum(bytes/1024/1024)”Size in MB” from v$log group by group#; GROUP# Size in…
You can use flashback technology on standby side. If you want to make application test on database, you can use data guard as read write mode temporarily with flashback technology. You can create a restore point on standby side then you can do any transaction on standby side to test or any other purpose. After…
You can use the same steps to switchover for single data guard or multiple data guard configuration. Switchover operation will convert primary side to data guard and data guard to primary side. You have to control listeners whether it is running before switchover steps. Switchover Steps Primary Side SQL> alter system archive log current; SQL>…