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TECHDOCS-4676: Update read-from-volatile-layer.md from DHC links to Z…
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…oomin links (#527)

"Change DHC links to Zoomin links."

Resolves: TECHDOCS-4676
Signed-off-by: Marilyn Vidas marilyn.vidas@here.com

Signed-off-by: Marilyn Vidas marilyn.vidas@here.com
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mvidas committed Jun 20, 2024
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## Create `VolatileLayerClient`

You can use the `VolatileLayerClient` object to get the latest published data and partition metadata from a [volatile layer](https://developer.here.com/documentation/data-user-guide/portal/layers/layers.html#volatile-layers).
You can use the `VolatileLayerClient` object to get the latest published data and partition metadata from a [volatile layer](https://www.here.com/docs/bundle/data-api-developer-guide/page/rest/getting-data-volatile.html).

**To create the `VolatileLayerClient` object:**

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## Get partition metadata from a volatile layer

Partition metadata from a [volatile layer](https://developer.here.com/documentation/data-user-guide/portal/layers/layers.html#volatile-layers) consists of the following information about the partition:
Partition metadata from a [volatile layer](https://www.here.com/docs/bundle/data-api-developer-guide/page/rest/getting-data-volatile.html) consists of the following information about the partition:

- Data handle
- ID
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- Using the Metadata Service API
- Using the Query Service API

You can get partition metadata using the Query Service API only if the partition has the HERE tile scheme. For more information on the HERE tile scheme, see [Partitions](https://developer.here.com/documentation/data-user-guide/portal/layers/partitions.html).
You can get partition metadata using the Query Service API only if the partition has the HERE tile scheme. For more information on the HERE tile scheme, see [Partitions](https://www.here.com/docs/bundle/data-api-developer-guide/page/rest/partitions.html).

For performance reasons, it is best to use the Query Service API only to get metadata for a specific partition. For batch processes, and to get metadata for many partitions or all partitions in a layer, use the Metadata Service API.

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## Get data from a volatile layer

A [volatile layer](https://developer.here.com/documentation/data-user-guide/portal/layers/layers.html#volatile-layers) consists of key-value pairs. Each new value for a key overrides the old one. Therefore, you can only get the latest data from the volatile layer.
A [volatile layer](https://www.here.com/docs/bundle/data-api-developer-guide/page/rest/getting-data-volatile.html) consists of key-value pairs. Each new value for a key overrides the old one. Therefore, you can only get the latest data from the volatile layer.

**To get data from the volatile layer:**

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