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# Comprendere i prezzi e i parametri WAL di Amazon EMR
<a name="emr-hbase-wal-metrics"></a>


| Unità di fatturazione delle funzionalità principali | Informazioni | 
| --- | --- | 
| EMR-WAL-Read-GiB | API calls to read data from your table are billed as ReadRequestGiB. This includes [`Get` and `Scan`](https://hbase.apache.org/book.html#_data_model_operations) operations. Reads are charged based on the sizes of the read items. Amazon EMR bills at a minimum of 1 byte. For example, if you read a 1234.12 bytes item, you're charged for 1235 bytes. Reads are aggregated every hour for billing and shown as GiBs. | 
| EMR-WAL-Write-GiB | API calls to write data from your table are billed as Write-GiB. This includes [https://hbase.apache.org/book.html#_data_model_operations](https://hbase.apache.org/book.html#_data_model_operations) operations. Writes are charged based on the sizes of the written items. Amazon EMR bills at a minimum of 1 byte. For example, if you write a 1234.12 bytes item, you're charged for 1235 bytes. Writes are aggregated every hour for billing and shown as GiBs. | 
| EMR-WAL-WALHours | Viene fatturato il numero di WALs quello che memorizzi sul servizio. `EMR-WAL-WALHours` Amazon EMR crea un WAL per regione. HBase Ad esempio, se crei 20 HBase tabelle, incluse le tabelle di sistema, e ogni tabella ha due HBase regioni, utilizzi 28.800 ore WAL, calcolate come: <pre>  20 tables <br />x  2 Regions per table <br />x  1 WAL per Region <br />x 30 days <br />x 24 hours <br />-----------<br />28,800 EMR-WAL-WALHours</pre> | 

**`EMRWALCount`Esempio:**

![\[Line graph showing ResourceCount fluctuations over time, ranging from about 18.87 to 19.20.\]](http://docs.aws.amazon.com/it_it/emr/latest/ReleaseGuide/images/wal-metric.png)


**Esempio`EMRWALWorkspaceCount`:**

![\[Graph showing ResourceCount fluctuations over time, ranging from 7.97 to 8.32.\]](http://docs.aws.amazon.com/it_it/emr/latest/ReleaseGuide/images/wal-metric2.png)