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Querying in ClickHouse Cloud

The data in this system table is held locally on each node in ClickHouse Cloud. Obtaining a complete view of all data, therefore, requires the `clusterAllReplicas` function. See [here](/docs/operations/system-tables/overview#system-tables-in-clickhouse-cloud) for further details.

Information about [Refreshable Materialized Views](/docs/sql-reference/statements/create/view#refreshable-materialized-view). Contains all refreshable materialized views, regardless of whether there's a refresh in progress or not.

Columns:

- `database` ([String](/docs/sql-reference/data-types)) — The name of the database the table is in.
- `view` ([String](/docs/sql-reference/data-types)) — Table name.
- `uuid` ([UUID](/docs/sql-reference/data-types)) — Table uuid (Atomic database).
- `status` ([String](/docs/sql-reference/data-types)) — Current state of the refresh.
- `last_success_time` ([Nullable(DateTime)](/docs/sql-reference/data-types)) — Time when the latest successful refresh started. NULL if no successful refreshes happened since server startup or table creation.
- `last_success_duration_ms` ([Nullable(UInt64)](/docs/sql-reference/data-types)) — How long the latest refresh took.
- `last_refresh_time` ([Nullable(DateTime)](/docs/sql-reference/data-types)) — Time when the latest refresh attempt finished (if known) or started (if unknown or still running). NULL if no refresh attempts happened since server startup or table creation.
- `last_refresh_replica` ([String](/docs/sql-reference/data-types)) — If coordination is enabled, name of the replica that made the current (if running) or previous (if not running) refresh attempt.
- `next_refresh_time` ([Nullable(DateTime)](/docs/sql-reference/data-types)) — Time at which the next refresh is scheduled to start, if status = Scheduled.
- `exception` ([String](/docs/sql-reference/data-types)) — Error message from previous attempt if it failed.
- `retry` ([UInt64](/docs/sql-reference/data-types)) — How many failed attempts there were so far, for the current refresh. Not available if status is `RunningOnAnotherReplica`.
- `progress` ([Nullable(Float64)](/docs/sql-reference/data-types)) — Progress of the current running or most recently completed refresh at the given replica, between 0 and 1. NULL if status is `RunningOnAnotherReplica` or the refresh is not running.
- `read_rows` ([Nullable(UInt64)](/docs/sql-reference/data-types)) — Number of rows read by the current running or most recently completed refresh at the given replica. NULL if status is `RunningOnAnotherReplica`.
- `read_bytes` ([Nullable(UInt64)](/docs/sql-reference/data-types)) — Number of bytes read by the current running or most recently completed refresh at the given replica. NULL if status is `RunningOnAnotherReplica`
- `total_rows` ([Nullable(UInt64)](/docs/sql-reference/data-types)) — Estimated total number of rows that need to be read by the current running or most recently completed refresh at the given replica. NULL if status is `RunningOnAnotherReplica`
- `written_rows` ([Nullable(UInt64)](/docs/sql-reference/data-types)) — Number of rows written by the current running or most recently completed refresh at the given replica. NULL if status is `RunningOnAnotherReplica`
- `written_bytes` ([Nullable(UInt64)](/docs/sql-reference/data-types)) — Number of bytes written by the current running or most recently completed refresh at the given replica. NULL if status is `RunningOnAnotherReplica`

**Example**

```
SELECT
    database,
    view,
    status,
    last_refresh_result,
    last_refresh_time,
    next_refresh_time
FROM system.view_refreshes

┌─database─┬─view───────────────────────┬─status────┬─last_refresh_result─┬───last_refresh_time─┬───next_refresh_time─┐
│ default  │ hello_documentation_reader │ Scheduled │ Finished            │ 2023-12-01 01:24:00 │ 2023-12-01 01:25:00 │
└──────────┴────────────────────────────┴───────────┴─────────────────────┴─────────────────────┴─────────────────────┘
```

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