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# Comprendre la tarification et les statistiques d'Amazon EMR WAL
| Unité de facturation des fonctionnalités de base | Détails |
| --- | --- |
| 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 | Le numéro WALs que vous enregistrez sur le service est facturé comme`EMR-WAL-WALHours`. Amazon EMR crée un WAL par région. HBase Par exemple, si vous créez 20 HBase tables, y compris des tables système, et que chaque table comporte deux HBase régions, vous utilisez 28 800 heures WAL, calculées comme suit : 20 tables
x 2 Regions per table
x 1 WAL per Region
x 30 days
x 24 hours
-----------
28,800 EMR-WAL-WALHours
|
**Exemple `EMRWALCount` :**
**Exemple `EMRWALWorkspaceCount` :**
