com.db4o.filestats

Class FileUsageStats

java.lang.Object

com.db4o.filestats.FileUsageStats

public class FileUsageStats
extends java.lang.Object

Byte usage statistics for a db4o database file

Method Summary

Methods

Modifier and Type	Method and Description
long	classMetadata()
ClassUsageStats	classStats(java.lang.String name)
java.util.Iterator<ClassUsageStats>	classUsageStats()
long	commitTimestampUsage()
long	fileHeader()
long	fileSize()
long	freespace()
long	freespaceUsage()
long	idSystem()
java.lang.String	toString()
long	totalUsage()
long	uuidUsage()

Methods inherited from class java.lang.Object

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

Method Detail

fileHeader

public long fileHeader()

Returns:

bytes used by the db4o file header (static and variable parts)

freespace

public long freespace()

Returns:

total number of bytes registered as freespace, available for reuse

idSystem

public long idSystem()

Returns:

bytes used by the id system indices

classMetadata

public long classMetadata()

Returns:

number of bytes used for class metadata (class metadata repository and schema definitions)

freespaceUsage

public long freespaceUsage()

Returns:

number of bytes used for the bookkeeping of the freespace system itself

uuidUsage

public long uuidUsage()

Returns:

number of bytes used for the uuid index

commitTimestampUsage

public long commitTimestampUsage()

Returns:

number of bytes used for the commit timestamp indexes

fileSize

public long fileSize()

Returns:

total file size in bytes

totalUsage

public long totalUsage()

Returns:

number of bytes used aggregated from all categories - should always be equal to fileSize()

classUsageStats

public java.util.Iterator<ClassUsageStats> classUsageStats()

Returns:

the statistics for each persisted class

classStats

public ClassUsageStats classStats(java.lang.String name)

Parameters:

name - a fully qualified class name

Returns:

the statistics for the class with the given name

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object