How Result Caching Works
Result in caching works by storing the result sets of queries in a memory area called the Result Cache. This area is shared across all sessions that have enabled result caching. When a query is executed, the result set is stored in the Result Cache. The next time the same query is executed, the result set is retrieved from the Result Cache instead of re-executing the query.
The result set stored in the Result Cache is valid until the data in the underlying tables is modified. When this happens, the result set stored in the Result Cache is invalidated and the query is re-executed when the next request to retrieve the data is made. This ensures that the data retrieved from the cache is always up-to-date.
What is Result Caching in Oracle?
Result Caching is a feature of the Oracle database that allows query results to be stored in memory, eliminating the need to re-execute the query and improving overall query performance. It can be used in both single-instance and clustered environments to reduce physical I/O and improve the scalability of an Oracle database.
When a query is executed in Oracle, the database needs to access data from the disk, process it, and then return the results. This process can be quite time-consuming and can also require a significant amount of physical I/O. Result Caching eliminates the need to access the disk and process the data, instead storing the results in memory and allowing subsequent requests to access the cached results.