![]() 8+ Yearsof experience in IT industry comprising of Development of JAVA, general Systems Administration and Change Management, Software Configuration Management.Otherwise, you can use LDAP-based multimaster replication. If Oracle Single Sign-On10g (10.1.4.3.0) or later is also installed and Oracle Single Sign-On schema must be replicated for load balancing, use Oracle Database Advanced Replication-based multimaster replication. You can use LDAP multi-master replication to replicate the data between two or more nodes. You want to dedicate specific servers to certain applications, such as single sign-on or e-mail applications ![]() You want to increase scalability and performance by distributing work load among multiple servers Load Balancing is important in the following situations: If the local site does need to update the data and the updates must be replicated back to the master site, use two-way replication between master node and local nodes. If the local site does not update the data, use one-way replication from master node to local nodes You want to reduce the network dependency and network load caused by users from local sites connecting to the master site. You need the increased scalability and performance that you can get by distributing the work load among multiple servers. ![]() This might be the entire DIT or a partial DIT. You need a local copy of the master data that is specific to the local site. Local availability is important in the following situations: This section discusses the types of replication to use to achieve three features: local availability, load balancing, and high availability The type of replication you need depends on the features that are important in your enterprise. It can be either one-way or two-way.Ħ.3 What Kind of Replication Do You Need? The replication can be either full or partial. Fan-out uses LDAP as its transport mechanism. That consumer can then replicate to one or more other consumers. Replication is always peer-to-peer.Īlso called a point-to-point replication group, has a supplier replicating directly to a consumer. Multimaster replication can use either LDAP or Advanced Replication as its transport mechanism. In a multimaster replication environment, each node is both a supplier and a consumer node. It is also possible to configure Advanced Replication as single-master, by switching all nodes in a group except one to read-only mode.Įnables multiple sites, acting as equals, to manage groups of replicated data. Clients can update only the master node, and can only read data on any of the consumers. Has only one supplier replicating changes to one or more consumers. Table 6-4 Types of Directory Replication Groups Group Partial replication is most often LDAP-based.įigure 6-2 shows an example of partial replication. You can set up partial replication by using command-line tools or the Replication Wizard in Oracle Enterprise Manager. Decentralizing a directory in this way enables you to balance the workload between servers and build a highly available distributed directory, complete with fault tolerance and failover. Partial replication enables you to propagate one or more subtrees, rather than the entire DIT, to another node. Full replication can be based on either LDAP or Oracle Database Advanced Replication. You can also use it to distribute operations on the entire directory among different nodes. This type of replication ensures the high availability of the entire directory. Propagates one or more subtrees, rather than the entire DIT, to another node.įull replication involves propagating the entire DIT to another node. Propagates the entire DIT to another node. Table 6-1 Full or Partial Replication Content to Replicate When one server is unavailable, the traffic can be routed to other available servers. One of the most important reasons to implement directory replication is to increase overall system availability. ![]() Even if the deployment meets the load, it can be less costly to maintain two relatively low-end systems than one high-end system.įailure tolerance and higher overall system availability When directory access exceeds the capacity of an existing server, an additional server can share the load. In such cases, a regional replica is essential. A client accessing a directory server from outside the region could experience a very high latency, and even inadequate throughput. Suppose that the regions were interconnected with low bandwidth links involving multiple intermediate routers. Most corporations have operations in many regions in the world, and those operations need a common directory. Local accessibility and performance requirements There are many reasons to implement replication, including the following: ![]()
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