Disadvantages of Result Caching
- Increased Memory Usage: By storing the query results in memory, the amount of memory used by the database can increase significantly. This can lead to reduced scalability, as the amount of available memory can be quickly exhausted.
- Increased CPU Usage: By accessing the cached results, CPU usage can increase significantly. This can lead to reduced scalability, as the number of available CPU resources can be quickly exhausted.
- Increased Complexity: Result Caching adds an additional layer of complexity to the database, as the query results need to be managed in memory and accessed in a timely manner. This can lead to increased maintenance requirements and additional overhead.
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.