org.h2.command.dml
Class OptimizerHints

java.lang.Object
  org.h2.command.dml.OptimizerHints

public class OptimizerHints
extends java.lang.Object

Thread local hints for H2 query optimizer. All the ongoing queries in the current thread will run with respect to these hints, so if they are needed only for a single operation it is preferable to setup and drop them in try-finally block. Currently works only in embedded mode.

Constructor Summary

OptimizerHints()

Method Summary

static OptimizerHints	get() Get the current thread local hints or null if none.
boolean	getJoinReorderEnabled()
static void	set(OptimizerHints hints) Set thread local hints or null to drop any existing hints.
void	setJoinReorderEnabled(boolean joinReorderEnabled) Set whether reordering of tables (or anything else in the FROM clause) is enabled.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

OptimizerHints

public OptimizerHints()

Method Detail

set

public static void set(OptimizerHints hints)

Set thread local hints or null to drop any existing hints.

Parameters:

hints - the hints

get

public static OptimizerHints get()

Get the current thread local hints or null if none.

Returns:

the hints

setJoinReorderEnabled

public void setJoinReorderEnabled(boolean joinReorderEnabled)

Set whether reordering of tables (or anything else in the FROM clause) is enabled. By default is true.

Parameters:

joinReorderEnabled - Flag value.

getJoinReorderEnabled

public boolean getJoinReorderEnabled()