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# 了解 Amazon EMR WAL 定价和指标
| 核心功能计费单位 | Details |
| --- | --- |
| 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 | 您在服务上存储 WALs 的数量按以下方式计费。`EMR-WAL-WALHours`Amazon EMR 为每个区域创建一个 WAL。 HBase例如，如果您创建了 20 个 HBase 表（包括系统表），并且每个表有两个 HBase 区域，那么您将使用 28,800 个 WAL 小时，计算公式为： 20 tables
x 2 Regions per table
x 1 WAL per Region
x 30 days
x 24 hours
-----------
28,800 EMR-WAL-WALHours
|
**示例`EMRWALCount`：**
**示例`EMRWALWorkspaceCount`：**
