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Advanced PL/SQL Features

  • PL/SQL Data Types
  • Dynamic SQL
  • PL/SQL Optimize Level
  • Compiling PL/SQL Units for Native Execution
  • Exception Handling
  • Conditional Compilation

PL/SQL Data Types

The PL/SQL data types include the SQL data types, additional scalar data types, and composite data types. You define the composite data types. You can also define subtypes of the scalar data types.

Dynamic SQL

Dynamic SQL is a programming methodology for generating and running SQL statements at runtime. It is useful when writing general-purpose and flexible programs like dynamic query systems, when writing programs that must run database definition language (DDL) statements, or when you do not know at compile time the full text of a SQL statement or the number of data types of its input and output variables.

PL/SQL Optimize Level

The PL/SQL optimize level determines how much the PL/SQL optimizer can rearrange code for better performance.

Compiling PL/SQL Units for Native Execution

You can usually speed up PL/SQL units by compiling them into native code (processor-dependent system code), which is stored in the SYSTEM tablespace.

Exception Handling

Exceptions (PL/SQL runtime errors) can arise from design faults, coding mistakes, hardware failures, and many other sources. You cannot anticipate all possible exceptions, but you can write exception handlers that let your program to continue to operate in their presence.

  • Conditional compilation lets you customize the functionality of a PL/SQL application without removing source text.
  • Use new features with the latest database release and disable them when running the application in an older database release.
  • Activate debugging or tracing statements in the development environment and hide them when running the application at a production site.


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