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45 lines
4.0 KiB
Markdown
45 lines
4.0 KiB
Markdown
---
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slug: /en/operations/system-tables/view_refreshes
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---
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# view_refreshes
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Information about [Refreshable Materialized Views](../../sql-reference/statements/create/view.md#refreshable-materialized-view). Contains all refreshable materialized views, regardless of whether there's a refresh in progress or not.
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Columns:
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- `database` ([String](../../sql-reference/data-types/string.md)) — The name of the database the table is in.
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- `view` ([String](../../sql-reference/data-types/string.md)) — Table name.
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- `uuid` ([UUID](../../sql-reference/data-types/uuid.md)) — Table uuid (Atomic database).
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- `status` ([String](../../sql-reference/data-types/string.md)) — Current state of the refresh.
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- `last_success_time` ([Nullable](../../sql-reference/data-types/nullable.md)([DateTime](../../sql-reference/data-types/datetime.md))) — Time when the latest successful refresh started. NULL if no successful refreshes happened since server startup or table creation.
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- `last_success_duration_ms` ([Nullable](../../sql-reference/data-types/nullable.md)([UInt64](../../sql-reference/data-types/int-uint.md))) — How long the latest refresh took.
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- `last_refresh_time` ([Nullable](../../sql-reference/data-types/nullable.md)([DateTime](../../sql-reference/data-types/datetime.md))) — 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.
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- `last_refresh_replica` ([String](../../sql-reference/data-types/string.md)) — If coordination is enabled, name of the replica that made the current (if running) or previous (if not running) refresh attempt.
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- `next_refresh_time` ([Nullable](../../sql-reference/data-types/nullable.md)([DateTime](../../sql-reference/data-types/datetime.md))) — Time at which the next refresh is scheduled to start, if status = Scheduled.
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- `exception` ([String](../../sql-reference/data-types/string.md)) — Error message from previous attempt if it failed.
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- `retry` ([UInt64](../../sql-reference/data-types/int-uint.md)) — How many failed attempts there were so far, for the current refresh.
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- `progress` ([Float64](../../sql-reference/data-types/float.md)) — Progress of the current refresh, between 0 and 1. Not available if status is `RunningOnAnotherReplica`.
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- `read_rows` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Number of rows read by the current refresh so far. Not available if status is `RunningOnAnotherReplica`.
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- `read_bytes` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Number of bytes read during the current refresh. Not available if status is `RunningOnAnotherReplica`.
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- `total_rows` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Estimated total number of rows that need to be read by the current refresh. Not available if status is `RunningOnAnotherReplica`.
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- `written_rows` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Number of rows written during the current refresh. Not available if status is `RunningOnAnotherReplica`.
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- `written_bytes` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Number rof bytes written during the current refresh. Not available if status is `RunningOnAnotherReplica`.
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**Example**
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```sql
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SELECT
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database,
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view,
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status,
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last_refresh_result,
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last_refresh_time,
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next_refresh_time
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FROM system.view_refreshes
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┌─database─┬─view───────────────────────┬─status────┬─last_refresh_result─┬───last_refresh_time─┬───next_refresh_time─┐
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│ default │ hello_documentation_reader │ Scheduled │ Finished │ 2023-12-01 01:24:00 │ 2023-12-01 01:25:00 │
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└──────────┴────────────────────────────┴───────────┴─────────────────────┴─────────────────────┴─────────────────────┘
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```
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