Chunk

java.lang.Object
- org.h2.mvstore.Chunk

```
public class Chunk
extends java.lang.Object
```
A chunk of data, containing one or multiple pages.
Chunks are page aligned (each page is usually 4096 bytes). There are at most 67 million (2^26) chunks, each chunk is at most 2 GB large.

Field Summary

Fields
Modifier and Type	Field and Description
`long`	`block` The start block number within the file.
`int`	`collectPriority` The garbage collection priority.
`int`	`id` The chunk id.
`int`	`len` The length in number of blocks.
`int`	`mapId` The last used map id.
`static int`	`MAX_ID` The maximum chunk id.
`long`	`maxLen` The sum of the max length of all pages.
`long`	`maxLenLive` The sum of the max length of all pages that are in use.
`long`	`metaRootPos` The position of the meta root.
`long`	`next` The predicted position of the next chunk.
`int`	`pageCount` The total number of pages in this chunk.
`int`	`pageCountLive` The number of pages still alive.
`long`	`time` When this chunk was created, in milliseconds after the store was created.
`long`	`unused` When this chunk was no longer needed, in milliseconds after the store was created.
`long`	`version` The version stored in this chunk.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`java.lang.String`	`asString()` Get the chunk data as a string.
`boolean`	`equals(java.lang.Object o)`
`static Chunk`	`fromString(java.lang.String s)` Build a block from the given string.
`int`	`getFillRate()` Calculate the fill rate in %.
`int`	`hashCode()`
`java.lang.String`	`toString()`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - MAX_ID
```
public static final int MAX_ID
```
    The maximum chunk id.
    
    See Also:
    
    Constant Field Values
  - id
```
public final int id
```
    The chunk id.
  - block
```
public long block
```
    The start block number within the file.
  - len
```
public int len
```
    The length in number of blocks.
  - pageCount
```
public int pageCount
```
    The total number of pages in this chunk.
  - pageCountLive
```
public int pageCountLive
```
    The number of pages still alive.
  - maxLen
```
public long maxLen
```
    The sum of the max length of all pages.
  - maxLenLive
```
public long maxLenLive
```
    The sum of the max length of all pages that are in use.
  - collectPriority
```
public int collectPriority
```
    The garbage collection priority. Priority 0 means it needs to be collected, a high value means low priority.
  - metaRootPos
```
public long metaRootPos
```
    The position of the meta root.
  - version
```
public long version
```
    The version stored in this chunk.
  - time
```
public long time
```
    When this chunk was created, in milliseconds after the store was created.
  - unused
```
public long unused
```
    When this chunk was no longer needed, in milliseconds after the store was created. After this, the chunk is kept alive a bit longer (in case it is referenced in older versions).
  - mapId
```
public int mapId
```
    The last used map id.
  - next
```
public long next
```
    The predicted position of the next chunk.
- Method Detail
  - fromString
```
public static Chunk fromString(java.lang.String s)
```
    Build a block from the given string.
    
    Parameters:
    
    s - the string
    
    Returns:
    
    the block
  - getFillRate
```
public int getFillRate()
```
    Calculate the fill rate in %. 0 means empty, 100 means full.
    
    Returns:
    
    the fill rate
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class java.lang.Object
  - equals
```
public boolean equals(java.lang.Object o)
```
    Overrides:
    
    equals in class java.lang.Object
  - asString
```
public java.lang.String asString()
```
    Get the chunk data as a string.
    
    Returns:
    
    the string
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object

Class Chunk

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

MAX_ID

id

block

len

pageCount

pageCountLive

maxLen

maxLenLive

collectPriority

metaRootPos

version

time

unused

mapId

next

Method Detail

fromString

getFillRate

hashCode

equals

asString

toString