Package com.mongodb

Enum ExplainVerbosity

java.lang.Object

java.lang.Enum<ExplainVerbosity>

com.mongodb.ExplainVerbosity

All Implemented Interfaces:

Serializable, Comparable<ExplainVerbosity>

public enum ExplainVerbosity
extends Enum<ExplainVerbosity>

An enumeration of the verbosity levels available for explaining query execution.

Since:

3.0

Since server release

3.0

Enum Constant Summary

Enum Constants

Enum Constant	Description
ALL_PLANS_EXECUTIONS	Runs the query optimizer and chooses the winning plan, but then runs all generated plans to completion.
EXECUTION_STATS	Runs the query optimizer, and then runs the winning plan to completion.
QUERY_PLANNER	Runs the query planner and chooses the winning plan, but does not actually execute it.

Method Summary

Modifier and Type	Method	Description
static ExplainVerbosity	valueOf(String name)	Returns the enum constant of this type with the specified name.
static ExplainVerbosity[]	values()	Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

QUERY_PLANNER

public static final ExplainVerbosity QUERY_PLANNER

Runs the query planner and chooses the winning plan, but does not actually execute it. The use case for this verbosity level is "Which plan will MongoDB choose to run my query."

EXECUTION_STATS

public static final ExplainVerbosity EXECUTION_STATS

Runs the query optimizer, and then runs the winning plan to completion. In addition to the planner information, this makes execution stats available. The use case for this verbosity level is "Is my query performing well."

ALL_PLANS_EXECUTIONS

public static final ExplainVerbosity ALL_PLANS_EXECUTIONS

Runs the query optimizer and chooses the winning plan, but then runs all generated plans to completion. This makes execution stats available for all of the query plans. The use case for this verbosity level is "I have a problem with this query, and I want as much information as possible in order to diagnose why it might be slow."

Method Detail

values

public static ExplainVerbosity[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (ExplainVerbosity c : ExplainVerbosity.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static ExplainVerbosity valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null