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add example web config

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DanRoscigno 2023-06-28 11:00:07 -04:00
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docs/en/engines/table-engines/mergetree-family/mergetree.md
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@ -945,7 +945,7 @@ configuration files; all the settings are in the CREATE/ATTACH query.
The example uses `type=web`, but any disk type can be configured as dynamic, even Local disk. Local disks require a path argument to be inside the server config parameter `custom_local_disks_base_directory`, which has no default, so set that also when using local disk. The example uses `type=web`, but any disk type can be configured as dynamic, even Local disk. Local disks require a path argument to be inside the server config parameter `custom_local_disks_base_directory`, which has no default, so set that also when using local disk.
::: :::
#### Example dynamic web storage {#web-storage} #### Example dynamic web storage
```sql ```sql
ATTACH TABLE uk_price_paid UUID 'cf712b4f-2ca8-435c-ac23-c4393efe52f7' ATTACH TABLE uk_price_paid UUID 'cf712b4f-2ca8-435c-ac23-c4393efe52f7'
@ -1249,6 +1249,57 @@ Examples of working configurations can be found in integration tests directory (
Zero-copy replication is disabled by default in ClickHouse version 22.8 and higher. This feature is not recommended for production use. Zero-copy replication is disabled by default in ClickHouse version 22.8 and higher. This feature is not recommended for production use.
::: :::
## Web storage (read-only) {#web-storage}
Web storage can be used for read-only purposes. An example use is for hosting sample
data, or for migrating data.
:::tip
Storage can also be configured temporarily within a query, if a web dataset is not expected
to be used routinely, see [dynamic storage](#dynamic-storage) and skip editing the
configuration file.
:::
In this sample configuration:
- the disk is of type `web`
- the data is hosted at `http://nginx:80/test1/`
- a cache on local storage is used
```xml
<clickhouse>
<storage_configuration>
<disks>
<web>
<type>web</type>
<endpoint>http://nginx:80/test1/</endpoint>
</web>
<cached_web>
<type>cache</type>
<disk>web</disk>
<path>cached_web_cache/</path>
<max_size>100000000</max_size>
</cached_web>
</disks>
<policies>
<web>
<volumes>
<main>
<disk>web</disk>
</main>
</volumes>
</web>
<cached_web>
<volumes>
<main>
<disk>cached_web</disk>
</main>
</volumes>
</cached_web>
</policies>
</storage_configuration>
</clickhouse>
```
## Virtual Columns {#virtual-columns} ## Virtual Columns {#virtual-columns}
- `_part` — Name of a part. - `_part` — Name of a part.