Oracle | DBMS_JAVA

Oracle DBMS_JAVA_DEFINERS Version 26ai

General Information

Library Note

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Oracle Database 26ai will be available on generic Linux platforms in January and soon on AIX and Windows

Purpose Utility support the compilation and decompilation of Java classes and methods within the Oracle Database.

AUTHID DEFINER

Dependencies

DBMS_JAVA

Documented No

Exceptions

Error Code	Reason
ORA-29532	Uncaught Java exception

First Available Not Known

Security Model Owned by SYS with no privileges granted.

A lower version grant to PUBLIC has been revoked.

Source {ORACLE_HOME}/javavm/install/initdbj.sql

Subprograms

COMPILE_CLASS_	GET_NTH_NATIVE_COMPILER_OPTION	UNCOMPILE_METHOD_
COMPILE_METHOD_	SET_NATIVE_COMPILER_OPTION_	UNSET_NATIVE_COMPILER_OPTION_
DECODE_NATIVE_COMPILER_OPTION_	UNCOMPILE_CLASS_

COMPILE_CLASS_

Compiles all methods defined by the class identified by class name in the supplied schema and returns the number of methods successfully compiled dbms_java_definers.compile_class_( schema IN VARCHAR2, classname IN VARCHAR2) RETURN NUMBER;

TBD

COMPILE_METHOD_

Compiles the method specified by name and Java type signature defined by the class identified by class name in the supplied schema

Returns the number of methods successfully compiled dbms_java_definers.compile_method_( schema IN VARCHAR2, classname IN VARCHAR2, methodname IN VARCHAR2, methodsig IN VARCHAR2) RETURN NUMBER;

TBD

DECODE_NATIVE_COMPILER_OPTION_

Decodes, into a user-readable format, a persisted native-compiler option

This function is not intended to be used by users directly dbms_java_definers.decode_native_compiler_option_( optionname IN VARCHAR2, value IN VARCHAR2) RETURN VARCHAR2;

SELECT dbms_java_definers.decode_native_compiler_option_('optimizationsLevel', 'High');

      

      DBMS_JAVA_DEFINERS.DECODE_NATIVE_COMPILER_OPTION_('OPTIMIZATIONSLEVEL','HIGH')

      ------------------------------------------------------------------------------

      High

GET_NTH_NATIVE_COMPILER_OPTION

Returns information about the specified native compiler option dbms_java_definers.get_nth_native_compiler_option(n IN NUMBER) RETURN VARCHAR2;

SELECT dbms_java_definers.get_nth_native_compiler_option(1);

      

      DBMS_JAVA_DEFINERS.GET_NTH_NATIVE_COMPILER_OPTION(1)

      ----------------------------------------------------

      Option 'asyncPollLevel'

      Level of polling used by generated code.

      Asycynchronous events (such as Ctrl-C interrupt) are polled for in

      compiled code. This option specifies how compiled-code should poll

      for these events.

      Values:

      SysEventsOnly - Poll on System-events (such as GC) only. This is default.

      MethodEntry - Poll on each method-entry.

      MethodEntryAndBranches - Poll on each method-entry and backwards-branch.

      Format:

      'asyncPollLevel', '<value>'

      

      SELECT dbms_java_definers.get_nth_native_compiler_option(2);

      

      DBMS_JAVA_DEFINERS.GET_NTH_NATIVE_COMPILER_OPTION(2)

      ----------------------------------------------------

      Option 'debugTraceLevel'

      Level of debugging trace used by the compiler.

      Values:

      None - No debugging. This is default.

      Minimal - Minimal debugging.

      OptimizationsSummary - Minimal debugging and summarize optimizer decisions.

      OptimizationsDetail - Minimal debugging and detail optimizer decisions.

      Verbose - Verbose debugging.

      All - All debugging.

      Format:

      'debugTraceLevel', '<value>'

      

      SELECT dbms_java_definers.get_nth_native_compiler_option(3);

      

      
      DBMS_JAVA_DEFINERS.GET_NTH_NATIVE_COMPILER_OPTION(3)

      ----------------------------------------------------

      Option 'debugAssertLevel'

      Level of debugging assertions used by the compiler.

      Values:

      None - No assertions. This is default.

      Minimal - Minimal assertions.

      All - All assertions.

      Format:

      'debugAssertLevel', '<value>'

      

      SELECT dbms_java_definers.get_nth_native_compiler_option(4);

      

      
      DBMS_JAVA_DEFINERS.GET_NTH_NATIVE_COMPILER_OPTION(4)

      ----------------------------------------------------

      Option 'optimizationsLevel'

      Default optimization level of the compiler.

      Setting this option modifies the default value of several individual

      optimizations. Any value specified for individual optimizations override these

      defaults. Note that the machine code of methods compiled with a lower

      than default optimization level is saved in the database and reused in subsequent

      database invocations, despite any higher subsequent optimization level setting.

      Values:

      High - All optimizations. This is the default default.

      Medium - Medium optimizations. Avoid optimizations that significantly increase compile time.

      When Medium is specified, the following optimzations are disabled by default:

      optimizerSIMD

      optimizerLoopBoundsCheckElimination

      optimizerLoopUnrollOptimization

      optimizerPartialRedundancyElimination

      graphColoringRegAlloc

      Low - Minimal optimizations.

      When Low is specified, the following additional optimzations are disabled by default:

      optimizerMethodInlining

      optimizerHnumConditionalMethodInlining

      optimizerEagerlyCompileForInlining

      optimizerInlineExternalMethods

      optimizerInlineExceptionalMethods

      optimizerLoadStoreElimination

      optimizerBoundsCheckRemoval

      optimizerInlineNonLeafMethods

      optimizerBoundsCheckRemovalSubtractionVertices

      optimizerLoopLICMOptimization

      optimizerConditionalMoves

      optimizerAnnotationConstraints

      optimizerWellKnownMethods

      optimizerExceptionTraceHandling

      optimizerOperationCombining

      optimizerStaticProfileAnalysis

      regallocPartitionRegisters

      regallocCoalesceSpillLoadsStores

      scheduleInstructions

      None - No optimizations.

      When None is specified, the following additional optimzations are disabled by default:

      optimizerLoopPagedConversion

      optimizerThrowConversion

      optimizerBranchElimination

      optimizerBranchSimplification

      optimizerCopyPropagation

      optimizerDeadCodeElimination

      optimizerConstantFolding

      optimizerCommonSubexpressionElimination

      optimizerTypePropagation

      optimizerStrengthReduction

      optimizerCombineDivMod

      optimizerBatchWKExceptions

      optimizerSlowpathsOOL

      regallocGenerateGCMaps

      Format:

      'optimizationsLevel', '<value>'

      

      SELECT dbms_java_definers.get_nth_native_compiler_option(<tested_values_up_to_44>);

SET_NATIVE_COMPILER_OPTION_

sets a native-compiler option to the specified value for the given schema dbms_java_definers.set_native_compiler_option_( optionname IN VARCHAR2, value IN VARCHAR2, owner IN NUMBER);

exec dbms_java_definers.set_native_compiler_option_('optimizationsLevel', 'High', 0);

      

      PL/SQL procedure successfully completed.

UNCOMPILE_CLASS_

Decompiles all methods defined by the class identified by classname in the supplied schema dbms_java_definers.uncompile_class_( schema IN VARCHAR2, classname IN VARCHAR2, permanentp IN NUMBER) RETURN NUMBER;

TBD

UNCOMPILE_METHOD_

Decompile the method specified by the name and Java type signature defined by the class identified by classname in the supplied schema dbms_java_definers.uncompile_method_( schema IN VARCHAR2, classname IN VARCHAR2, methodname IN VARCHAR2, methodsig IN VARCHAR2, permanentp IN NUMBER) RETURN NUMBER;

TBD

UNSET_NATIVE_COMPILER_OPTION_

unsets a native-compiler option given by the tuple [optionName, value] for the given schemas

If the option given by optionName is not allowed to have duplicate values, then the value is ignored dbms_java_definers.unset_native_compiler_option_( optionname IN VARCHAR2 value IN VARCHAR2 owner IN NUMBER);

exec dbms_java_definers.unset_native_compiler_option_('optimizationsLevel', 'High', 0);

      

      PL/SQL procedure successfully completed.