Refer to “Appendix A Parameters”, after estimating the total amount of memory to be used as the catalog cache and relation cache, when the total amount of memory exceeds the amount of installed memory or occupies a large amount of installed memory, consider using this feature.
This feature adds the action of discarding the meta cache that has been held permanently. If you attempt to refer to a destroyed meta cache again, the meta cache is recreated, so using this feature will result in poor performance compared to not using it.
Therefore, read the following to understand how to discard a meta cache.
How to set the upper limit with these considerations is described in detail in the estimation formula in “Appendix A Parameters”.
