DynamoDbVersionAttribute (AWS Java SDK :: DynamoDB :: Enhanced Client 2.41.26 API)

```
@SdkPublicApi
@Target(METHOD)
@Retention(RUNTIME)
public @interface DynamoDbVersionAttribute
```
Denotes this attribute as recording the version record number to be used for optimistic locking. Every time a record with this attribute is written to the database it will be incremented and a condition added to the request to check for an exact match of the old version.
Version Calculation: The first version written to a new record is calculated as startAt + incrementBy. For example, with startAt=0 and incrementBy=1 (defaults), the first version is 1. To start versioning from 0, use startAt=-1 and incrementBy=1, which produces first version = 0.

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element	Description
`long`	`incrementBy`	The amount to increment the version by with each update.
`long`	`startAt`	The starting value for the version attribute.

- Element Detail
  - startAt
```
long startAt
```
    The starting value for the version attribute. Default value - 0.
    
    Returns:
    
    the starting value
    
    Default:
    
    0L
- - incrementBy
```
long incrementBy
```
    The amount to increment the version by with each update. Default value - 1.
    
    Returns:
    
    the increment value
    
    Default:
    
    1L