Where Result set is stored while working with jdbc and oracle driver

Question

Once I use jdbc with oracle driver and run select query is the result of the query is stored in the server of oracle memory or file system or temp table ?

and once I

Answer 1

Depending on the exact implementation, part of the resultset will be prefetched into the JVM and part of it will either be in the memory of the Oracle server, or will simply be loaded from the database when more rows are requested.

When executing a query the database does not always need to read all rows from before returning data to the client (depending on the access path of the query, ability of the optimizer, functionality of the db etc).

When you set the fetchSize() on the Statement, you are only giving a hint to the JDBC driver how much you think it should prefetch. The JDBC driver is free to ignore you. I do not know what the Oracle driver does with the fetchSize(). Most notorious AFAIK is (or maybe was) the MySQL JDBC driver which will always fetch all rows unless you set the fetchSize() to Integer.MIN_VALUE.