org.dashbuilder.dataset.engine.index.stats

Interface DataSetIndexStats

All Known Implementing Classes:

DataSetIndexStatsImpl

public interface DataSetIndexStats

A DataSetIndex stats

Method Summary

Modifier and Type	Method and Description
long	getBuildTime() Time required to "build" (load, create, filter, ...) the data set.
long	getIndexSize() Return the estimated memory (in bytes) the data set index is consuming.
DataSetIndexElement	getLessReused() An index reference to the less reused element.
DataSetIndexElement	getLongestBuild() An index reference to the element that takes more time to get instantiated.
DataSetIndexElement	getMostReused() An index reference to the most reused element.
int	getNumberOfAggFunctions() Total number of aggregate function calculations executed over the data set
int	getNumberOfFilterOps() Total number of filter operations executed over the data set
int	getNumberOfGroupOps() Total number of group operations over the data set
int	getNumberOfSortOps() Total number of sort operations executed over the data set
double	getReuseRate() The ratio between the reuse time and the build time.
long	getReuseTime() The real usage time this element would have if was not indexed.
DataSetIndexElement	getShortestBuild() An index reference to the element that takes less time to get instantiated.
String	toString(String sep) Prints a stats summary.

Method Detail

getBuildTime

long getBuildTime()

Time required to "build" (load, create, filter, ...) the data set.

Returns:

Time in nanoseconds

getReuseTime

long getReuseTime()

The real usage time this element would have if was not indexed.

Returns:

Time in nanoseconds

getReuseRate

double getReuseRate()

The ratio between the reuse time and the build time.

getNumberOfGroupOps

int getNumberOfGroupOps()

Total number of group operations over the data set

getNumberOfFilterOps

int getNumberOfFilterOps()

Total number of filter operations executed over the data set

getNumberOfSortOps

int getNumberOfSortOps()

Total number of sort operations executed over the data set

getNumberOfAggFunctions

int getNumberOfAggFunctions()

Total number of aggregate function calculations executed over the data set

getLongestBuild

DataSetIndexElement getLongestBuild()

An index reference to the element that takes more time to get instantiated.

getShortestBuild

DataSetIndexElement getShortestBuild()

An index reference to the element that takes less time to get instantiated.

getLessReused

DataSetIndexElement getLessReused()

An index reference to the less reused element.

getMostReused

DataSetIndexElement getMostReused()

An index reference to the most reused element.

getIndexSize

long getIndexSize()

Return the estimated memory (in bytes) the data set index is consuming.

Returns:

The number of bytes

toString

String toString(String sep)

Prints a stats summary.

Parameters:

sep - The separator string to insert between every stat.