Resultset - retrieves all rows or only one at a time

Hey guys,
I am using oracle DB. Lets say the query i run has about 1000 records
when i call:
prepareStmt(cstmt);
Rsultset rs = cstmt.executeQuery();
Do I get all the records, or do i get them one by one
when i call
rs.next
is this DB specific??
This is simple q, but i been working with oracle and java for a while, and for some reason this never came up.
thank you.

The driver implementation is free to retrieve as many or as few rows at a time from the database as it wants. You can suggest to the driver how many rows at a time it should retrieve with setFetchSize(); the driver is free to ignore your suggestion (but many drivers honor it). The fetch size default varies wildly from driver to driver, from 1 row at a time to all rows at a once. For the Oracle thin driver, the default is 10, which is usually too small to give the best performance (I use between 100 and 1,000, usually 250).
Note that when you're working with a very large ResultSet, a driver that does "all rows at once" can cause you to run out of memory. Also, some drivers will cache every single row when using a scrollable ResultSet (and again run you out of memory) but not do so with a forward-only ResultSet (Oracle has this issue).

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