![]() ![]() If changes occur during cache warming, then they will be applied to the cache once HotCache is started so no changes are lost. ![]() Start HotCache so that it can propagate changes in the trail file into the cache. Start the Coherence cache server and warm the cache, if required. These changes will be placed into a "trail file". GoldenGate monitors the transaction log for changes of interest. See Starting the Application in Administering Oracle GoldenGate Application Adapters. The following scenario describes how HotCache could be used to work with the database and with applications that use Coherence caches. The configuration can be captured in XML exclusively or in XML with annotations. Standard JPA is used to capture the mappings from database data to Java objects. HotCache can be added to any Coherence application. Low latency is assured because the data is pushed when the change occurs in the database. ![]() HotCache employs an efficient push model which processes only stale data. HotCache solves this problem by monitoring the database and pushing any changes into the Coherence cache. Third-party updates to the database can cause Coherence applications to work with data which could be stale and out-of-date. You can manage HotCache to ensure that cache update operations are performed within acceptable time limits. In Multitenant mode, a tenant identifier is used in conjunction with a Coherence scope name to ensure that HotCache only refreshes caches for a specified tenant. HotCache can refresh caches for specific tenants. Multiple threads can increase the throughput of a HotCache process as compared to using a single thread to apply trail file operations. HotCache can use multiple threads to apply trail file operations to Coherence caches. Configuring Multi-Threading in HotCache.It is reasonable to expect HotCache to support Oracle-specific data types supported by EclipseLink. HotCache uses EclipseLink as its JPA provider. Implementing High Availability for HotCacheĪs a cache client, HotCache can be configured either as a Coherence cluster member or as a Coherence*Extend client connecting to a Coherence proxy service in the cluster.This approach eliminates the need to write custom cache warming programs because it leverages GoldenGate and HotCache for initial cache warming. HotCache can be used to warm caches by loading an initial dataset. You can customize HotCache using a number of custom JPA properties that can be configured per JPA entity type. POF serialization can be used with HotCache but requires a small update to the POF configuration file (pof-config.xml) to allow for HotCache and TopLink Grid framework classes to be registered. Using Portable Object Format with HotCache.You must modify the classpaths of all Coherence cache server JVMs that contain caches that are refreshed by HotCache. Configuring the Coherence Cache Servers.The GoldenGate Java adapter provides a way to process GoldenGate data change events in Java by configuring an event handler class. Configuring the GoldenGate Java Adapter.HotCache is configured with system properties, EclipseLink JPA mapping metadata, and a JPA persistence.xml file. You then enable HotCache by configuring the GoldenGate Java Adapter. Updating a cache from a GoldenGate trail file requires configuring GoldenGate and HotCache. Make sure you complete the prerequisites prior to using Oracle Coherence GoldenGate HotCache. ![]() HotCache solves this problem by monitoring the database and pushing any changes into the Coherence cache.īefore implementing a HotCache solution, take some time to understand HotCache fundamentals and supported features. Overview of Oracle Coherence GoldenGate HotCache. ![]()
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