public class OptimizerTrace
extends java.lang.Object
This class provides static methods for controlling the optimizer tracing in a Derby database.
Constructor and Description |
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OptimizerTrace() |
Modifier and Type | Method and Description |
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static java.lang.String |
getOptimizerTraceOutput()
Get the optimizer trace output for the last optimized query as a String.
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static OptTrace |
getOptimizerTracer()
Get the current optimizer tracer, if any.
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static void |
setOptimizerTrace(boolean onOrOff)
Turn default optimizer tracing on or off.
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static void |
setOptimizerTracer(OptTrace tracer)
Install an optimizer tracer (to enable tracing) or uninstall the current optimizer tracer
(to disable tracing).
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public static void setOptimizerTrace(boolean onOrOff)
onOrOff
- Whether to turn optimizer tracing on (true) or off (false).public static void setOptimizerTracer(OptTrace tracer)
tracer
- Null if tracing is being turned off, otherwise an optimizer tracerpublic static OptTrace getOptimizerTracer()
public static java.lang.String getOptimizerTraceOutput()
Apache Derby V10.13 Internals - Copyright © 2004,2016 The Apache Software Foundation. All Rights Reserved.