PL/SQL is a technology and an integrated part of Oracle. it
has its own processing engine that executes PL/SQL blocks and subprograms. This
engine can be installed server or in any of the development tools such as
Oracle Forms. If the host program does not have a PIJSQL engine‘ the blocks of
code are sent to the Oracle server for processing.
Figure 4.3 shows the PL/SQL engine as an integrated
component of the Oracle server. The engine executes procedure statements and
passes SQL statements to the SQL statement executor in the Oracle server.
When Oracle tools come with a PL/SQL engine, the tools
process the PL/SQL blocks directly.
