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Update storing-data.md

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Kseniia Sumarokova 2021-10-03 21:49:07 +03:00 committed by GitHub
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docs/en/operations/storing-data.md
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@ -120,7 +120,7 @@ Example of disk configuration:
There is a tool `clickhouse-static-files-uploader`, which prepares a data directory for a given table (`SELECT data_paths FROM system.tables WHERE name = 'table_name'`). For each table you need, you get a directory of files. These files can be uploaded to, for example, a web server with static files. After this preparation, you can load this table into any ClickHouse server via `DiskWeb`.
This is a read-only disk. Its data is only read and never modified. A new table is loaded to this disk via `ATTACH TABLE` query (see example below). All modification of the data is prohibited, i.e. the following types of queries are not allowed: [CREATE TABLE](../sql-reference/statements/create/table.md), [ALTER TABLE](../sql-reference/statements/alter/index.md), [RENAME TABLE](../sql-reference/statements/rename.md#misc_operations-rename_table), [DETACH TABLE](../sql-reference/statements/detach.md) and [TRUNCATE TABLE](../sql-reference/statements/truncate.md).
This is a read-only disk. Its data is only read and never modified. A new table is loaded to this disk via `ATTACH TABLE` query (see example below). Local disk is not actually used, each `SELECT` query will result in a `http` request to fetch required data. All modification of the table data will result in an exception, i.e. the following types of queries are not allowed: [CREATE TABLE](../sql-reference/statements/create/table.md), [ALTER TABLE](../sql-reference/statements/alter/index.md), [RENAME TABLE](../sql-reference/statements/rename.md#misc_operations-rename_table), [DETACH TABLE](../sql-reference/statements/detach.md) and [TRUNCATE TABLE](../sql-reference/statements/truncate.md).
Web server storage is supported only for the [MergeTree](../engines/table-engines/mergetree-family/mergetree.md) and [Log](../engines/table-engines/log-family/log.md) engine families. To access the data stored on a `web` disk, use the [storage_policy](../engines/table-engines/mergetree-family/mergetree.md#terms) setting when executing the query. For example, `ATTACH TABLE table_web UUID '{}' (id Int32) ENGINE = MergeTree() ORDER BY id SETTINGS storage_policy = 'web'`.