Doug Porter 7, 4 4 gold badges 36 36 silver badges 53 53 bronze badges. SquishFish SquishFish 21 2 2 bronze badges. Vahid Nowrouzi Vahid Nowrouzi 11 1 1 bronze badge. High degree of control over program execution. Use of familiar 3GL programming techniques and application development tools such as browsers and debuggers. Support of dynamic SQL,method 4. Availability on the broadest range of platforms of all the Oracle programmatic interfaces.
Dynamic bind and define using callbacks. Describe functionality to expose layers of server metadata. Asynchronous event notification for registered client applications. Ability to associate a commit request with an execute to reduce round-trips. Optimization for queries using transparent prefetch buffers to reduce round-trips. Thread safety so you do not have to use mutual exclusive locks mutex on OCI handles.
The server connection in nonblocking mode means that control returns to the OCI code when a call is still executing or could not complete. Jason Tholstrup Jason Tholstrup 1, 3 3 gold badges 18 18 silver badges 24 24 bronze badges. Agreed - but the enterprise policy sigh recommends using thin clients over their 'thick' counterparts. Mogsdad Thanks Francisco. I got the solution see accepted answer. Anyways, appreciate you taking time to lend a hand. Sign up or log in Sign up using Google.
Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Making Agile work for data science. Stack Gives Back Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Linked Oracle Clusterware must be installed and active on the primary and standby sites for both single instance using Oracle Restart and Oracle RAC databases.
Oracle Data Guard broker coordinates with Oracle Clusterware to properly fail over role-based services to a new primary database after a Data Guard failover has occurred. Section 8. In Oracle Data Guard, the term "switchover" describes a planned event where a primary and standby database switch roles, usually to minimize the downtime while performing planned maintenance.
The configuration best practices to address unplanned failovers also address most of the requirements for a planned switchover, except for several additional manual steps that apply to logical standby databases SQL Apply. The following steps describe the additional manual switchover steps for Oracle Data Guard 11 g Release The primary database is converted to a standby database.
This disconnects all sessions and brings the database to the mount state. The standby database is converted to a primary database and any existing sessions are disconnected. Oracle Data Guard Broker shuts down read-only services. As the new primary and the new standby are opened, the respective services are started for each role and clients performing retries now see the services available and connect. Ensure that the proper reconnection logic has been configured for more information, see Section Net" and Section Stop the services that the primary application uses and the read-only applications enabled on the standby database.
Once the switchover has completed, restart the services used by the primary application and the read-only application. Sessions that were terminated reconnect once the service becomes available as part of the retry mechanism. Note that FAN is not needed to transition clients during a switchover operation if the application performs retries. FAN is only needed to break clients out of TCP timeout, a state that should only occur during unplanned outages. The process of failing over an application that has a large number of connections may create a login storm.
A login storm is a sudden spike in the number of connections to a database instance, which drains CPU resources. As CPU resources are depleted, application timeouts and application response times are likely to increase. The primary method of controlling login storms is to implement the Connection Rate Limiter feature of the Oracle listener.
This feature limits the number of connections that can be processed in seconds. Slowing down the rate of connections ensures that CPU resources remain available and that the system remains responsive. Configure Oracle Database for shared server operations.
In addition to implementing the Connection Rate Limiter, some applications can control login storms by configuring Oracle Database for shared server operations. By using shared server, the number of processes that must be created at failover time are greatly reduced, thereby avoiding a login storm. If such a capability is available in your application mid tier, try limiting the number of connections by adjusting the maximum number of connections in the mid tier connection pool.
Oracle Database Administrator's Guide for more information about configuring and controlling shared server operations. Global Data Services enables administrators to automatically and transparently manage client workloads across replicated databases that offer common services. A database service is a named representation of one or more database instances.
Services enable you to group database workloads and route a particular work request to an appropriate instance.
A global service is a service provided by multiple databases synchronized through data replication. Global Data Services provides dynamic load balancing, failover, and centralized service management for a set of replicated databases that offer common services.
The global services management framework is built around the following preexisting Oracle Database technologies:. Data Guard Broker - Enables creation, management, and monitoring of Data Guard configurations that include a primary database and up to 30 standby databases.
Oracle GDS provides the following key capabilities for a set of replicated databases that are globally distributed or located within the same data center:. Installing a Global Service Manager. You must install at least one global service manager for each Global Data Services region. Global service managers can be hosted on physical or virtual environments. For high availability, Oracle recommends installing multiple typically 3 global service managers in each region running on separate hosts.
Creating a Global Data Services Catalog. The catalog must reside in a 12c database and it is recommended that database be outside the GDS configuration. Adding a Global Services Pool.
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