Question about prepared statement in Java

Question

We have a prepared statement in Java, and we hear that it is different from Statement in the sense that this prepared statement does not need to be compiled every time it is used.

My question is, where is this compiled report stored? In client code that uses it or is stored in a database?

Why is the compiled statement stored in the data warehouse and if it works, and not for how long?

Answer 1

Databases have a query cache, which means that when executing a query, the database caches the parsed / compiled query and, possibly, the query plan to eliminate future calculations.

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