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When you select multiple records in PL/SQL and return them back to the client (in our case, a JDBC program), generally you have two options: Build an array of records, store all the rows in the array, and return the array of records to the JDBC client program. Return a ref cursor, which can be retrieved as a ResultSet in JDBC. Out of the two options, using a ref cursor is preferable because You need to do less work. Instead of storing all records in an array on the server (requiring memory on the server side), and retrieving it again in another set of records in your JDBC program (requiring memory on the client side), you simply return a pointer to the cursor, which can be retrieved as a result set. If you retrieve the data as a result set, it is easy to control the number of round-trips by setting the fetch size, as you learned in the section Prefetching of 7. Your JDBC code is simpler when you use a result set.

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Checking a code file out of source control and having a developer make changes to it is the most expensive kind of change that can be made to a system It requires a developer (not cheap) It requires the recompilation of binaries It requires regression testing of all areas of the application that are affected by a change to that binary (testers, automation, and time: aka more money) And then it takes a deployment and all of the requisite worry, heartache, and long hours that can accompany that Customizability frequently comes up when discussing these types of features A fully customizable solution is a totally nontrivial undertaking that can doom a project to never even ship a decent V1 (think of how long it took Microsoft to get Access right oh wait that hasn t happened yet ).

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Your PL/SQL code can be written using one of the two modes: definer rights or invoker rights. From a security and performance point of view, it is critical to understand these two modes while designing your PL/SQL code. This section gives an overview of what these modes are and when to use each. The concepts and examples in this section refer only to stand-alone procedures, but they are also applicable to stand-alone functions, as well as to procedures and functions in packages. Let s start by defining some related terms: Object name resolution is the process by which Oracle determines which schema object (table, view, etc.) you are referring to in your SQL statements. For example, when you refer to the emp object in the scott schema, object name resolution is the process by which Oracle identifies that emp refers to a table owned by scott. Database objects are typically resolved to a schema object owned by the user or to a public synonym. The definer of a procedure is the database user who defines and owns the procedure. The invoker of a procedure is the database user who is not an owner of a procedure but invokes (executes) the procedure.