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DOCAPI-6890: system.parts.is_frozen description.

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BayoNet 2019-06-05 16:32:38 +03:00
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docs/en/operations/system_tables.md
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@ -210,6 +210,8 @@ Formats:
- engine (String) – Name of the table engine without parameters.
- is_frozen (UInt8) – Flag that shows partition data backup existence. 1, the backup exists. 0, the backup not exist. For more details, see [FREEZE PARTITION](../query_language/alter.md#alter_freeze-partition)
## system.part_log {#system_tables-part-log}
The `system.part_log` table is created only if the [part_log](server_settings/settings.md#server_settings-part-log) server setting is specified.
@ -268,15 +270,15 @@ Contains information about queries execution. For each query, you can see proces
!!! note
The table doesn't contain input data for `INSERT` queries.
ClickHouse creates this table only if the [query_log](server_settings/settings.md#server_settings-query-log) server parameter is specified. This parameter sets the logging rules. For example, a logging interval or name of a table the queries will be logged in.
To enable query logging, set the parameter [log_queries](settings/settings.md#settings-log-queries) to 1. For details, see the [Settings](settings/settings.md) section.
The `system.query_log` table registers two kinds of queries:
1. Initial queries, that were run directly by the client.
2. Child queries that were initiated by other queries (for distributed query execution). For such a kind of queries, information about the parent queries is shown in the `initial_*` columns.
2. Child queries that were initiated by other queries (for distributed query execution). For such a kind of queries, information about the parent queries is shown in the `initial_*` columns.
Columns:
@ -284,22 +286,22 @@ Columns:
- 1 — Successful start of query execution.
- 2 — Successful end of query execution.
- 3 — Exception before the start of query execution.
- 4 — Exception during the query execution.
- 4 — Exception during the query execution.
- `event_date` (Date) — Event date.
- `event_time` (DateTime) — Event time.
- `query_start_time` (DateTime) — Time of the query processing start.
- `query_duration_ms` (UInt64) — Duration of the query processing.
- `query_duration_ms` (UInt64) — Duration of the query processing.
- `read_rows` (UInt64) — Number of read rows.
- `read_bytes` (UInt64) — Number of read bytes.
- `written_rows` (UInt64) — For `INSERT` queries, number of written rows. For other queries, the column value is 0.
- `written_bytes` (UInt64) — For `INSERT` queries, number of written bytes. For other queries, the column value is 0.
- `result_rows` (UInt64) — Number of rows in a result.
- `result_rows` (UInt64) — Number of rows in a result.
- `result_bytes` (UInt64) — Number of bytes in a result.
- `memory_usage` (UInt64) — Memory consumption by the query.
- `query` (String) — Query string.
- `exception` (String) — Exception message.
- `stack_trace` (String) — Stack trace (a list of methods called before the error occurred). An empty string, if the query is completed successfully.
- `is_initial_query` (UInt8) — Kind of query. Possible values:
- `is_initial_query` (UInt8) — Kind of query. Possible values:
- 1 — Query was initiated by the client.
- 0 — Query was initiated by another query for distributed query execution.
- `user` (String) — Name of the user initiated the current query.
@ -321,7 +323,7 @@ Columns:
- `client_version_minor` (UInt32) — Minor version of the [clickhouse-client](../interfaces/cli.md).
- `client_version_patch` (UInt32) — Patch component of the [clickhouse-client](../interfaces/cli.md) version.
- `http_method` (UInt8) — HTTP method initiated the query. Possible values:
- 0 — The query was launched from the TCP interface.
- 0 — The query was launched from the TCP interface.
- 1 — `GET` method is used.
- 2 — `POST` method is used.
- `http_user_agent` (String) — The `UserAgent` header passed in the HTTP request.
@ -518,13 +520,13 @@ This table contains the following columns (the type of the corresponding column
- `engine` (String) — Table engine name (without parameters).
- `is_temporary` (UInt8) - Flag that indicates whether the table is temporary.
- `data_path` (String) - Path to the table data in the file system.
- `metadata_path` (String) - Path to the table metadata in the file system.
- `metadata_path` (String) - Path to the table metadata in the file system.
- `metadata_modification_time` (DateTime) - Time of latest modification of the table metadata.
- `dependencies_database` (Array(String)) - Database dependencies.
- `dependencies_table` (Array(String)) - Table dependencies ([MaterializedView](table_engines/materializedview.md) tables based on the current table).
- `create_table_query` (String) - The query that was used to create the table.
- `engine_full` (String) - Parameters of the table engine.
- `partition_key` (String) - The partition key expression specified in the table.
- `partition_key` (String) - The partition key expression specified in the table.
- `sorting_key` (String) - The sorting key expression specified in the table.
- `primary_key` (String) - The primary key expression specified in the table.
- `sampling_key` (String) - The sampling key expression specified in the table.