Apache Derby Database Engine and Embedded JDBC Driver 10.17.1.0 · org.apache.derby.impl.sql.compile.OptimizerTracer

Access	Constructor and Description
public	OptimizerTracer() 0-arg constructor required by the OptionalTool contract

Method Summary

Modifier and Type	Method and Description
private SQLException	cantInstantiate(String className)
private static Context	getContext(final String contextID) Must be private so that user code can't call this entry point.
public void	loadTool(String... configurationParameters) Implements org.apache.derby.iapi.sql.dictionary.OptionalTool.loadTool. Turns on optimizer tracing.
public void	unloadTool(final String... configurationParameters) Implements org.apache.derby.iapi.sql.dictionary.OptionalTool.unloadTool. Print the optimizer trace and turn off tracing.
private SQLException	wrap(Throwable t) Wrap an exception in a SQLException
private SQLException	wrap(String errorMessage)

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

OptimizerTracer	back to summary
public OptimizerTracer() 0-arg constructor required by the OptionalTool contract

cantInstantiate	back to summary
private SQLException cantInstantiate(String className)

getContext	back to summary
private static Context getContext(final String contextID) Must be private so that user code can't call this entry point.

loadTool	back to summary
public void loadTool(String... configurationParameters) throws SQLException Implements org.apache.derby.iapi.sql.dictionary.OptionalTool.loadTool. Turns on optimizer tracing. May take optional parameters: xml - If the first arg is the "xml" literal, then trace output will be formatted as xml. custom, $class - If the first arg is the "custom" literal, then the next arg must be the name of a class which implements org.apache.derby.iapi.sql.compile.OptTrace and which has a 0-arg constructor. The 0-arg constructor is called and the resulting OptTrace object is plugged in to trace the optimizer.

loadTool

public void loadTool(String... configurationParameters) throws SQLException

Turns on optimizer tracing. May take optional parameters:

xml - If the first arg is the "xml" literal, then trace output will be formatted as xml.
custom, $class - If the first arg is the "custom" literal, then the next arg must be the name of a class which implements org.apache.derby.iapi.sql.compile.OptTrace and which has a 0-arg constructor. The 0-arg constructor is called and the resulting OptTrace object is plugged in to trace the optimizer.

unloadTool	back to summary
public void unloadTool(final String... configurationParameters) throws SQLException Implements org.apache.derby.iapi.sql.dictionary.OptionalTool.unloadTool. Print the optimizer trace and turn off tracing. Takes optional parameters: fileName - Where to write the optimizer trace. If omitted, the trace is written to System.out.

unloadTool

public void unloadTool(final String... configurationParameters) throws SQLException

Print the optimizer trace and turn off tracing. Takes optional parameters:

fileName - Where to write the optimizer trace. If omitted, the trace is written to System.out.

wrap	back to summary
private SQLException wrap(Throwable t) Wrap an exception in a SQLException

wrap	back to summary
private SQLException wrap(String errorMessage)