mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-22 15:42:02 +00:00
alexey-milovidov
GitHub
commit
50928323eb
@ -834,9 +834,6 @@ Possible values:
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Default value: `uniqExact`.
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[Original article](https://clickhouse.yandex/docs/en/operations/settings/settings/) <!--hide-->
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## skip_unavailable_shards {#settings-skip_unavailable_shards}
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Enables or disables silent skipping of:
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@ -107,19 +107,19 @@ Contains information about external dictionaries.
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Columns:
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- `name String` — Dictionary name.
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- `type String` — Dictionary type: Flat, Hashed, Cache.
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- `origin String` — Path to the configuration file that describes the dictionary.
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- `attribute.names Array(String)` — Array of attribute names provided by the dictionary.
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- `attribute.types Array(String)` — Corresponding array of attribute types that are provided by the dictionary.
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- `has_hierarchy UInt8` — Whether the dictionary is hierarchical.
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- `bytes_allocated UInt64` — The amount of RAM the dictionary uses.
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- `hit_rate Float64` — For cache dictionaries, the percentage of uses for which the value was in the cache.
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- `element_count UInt64` — The number of items stored in the dictionary.
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- `load_factor Float64` — The percentage filled in the dictionary (for a hashed dictionary, the percentage filled in the hash table).
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- `creation_time DateTime` — The time when the dictionary was created or last successfully reloaded.
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- `last_exception String` — Text of the error that occurs when creating or reloading the dictionary if the dictionary couldn't be created.
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- `source String` — Text describing the data source for the dictionary.
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- `name` (String) — Dictionary name.
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- `type` (String) — Dictionary type: Flat, Hashed, Cache.
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- `origin` (String) — Path to the configuration file that describes the dictionary.
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- `attribute.names` (Array(String)) — Array of attribute names provided by the dictionary.
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- `attribute.types` (Array(String)) — Corresponding array of attribute types that are provided by the dictionary.
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- `has_hierarchy` (UInt8) — Whether the dictionary is hierarchical.
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- `bytes_allocated` (UInt64) — The amount of RAM the dictionary uses.
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- `hit_rate` (Float64) — For cache dictionaries, the percentage of uses for which the value was in the cache.
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- `element_count` (UInt64) — The number of items stored in the dictionary.
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- `load_factor` (Float64) — The percentage filled in the dictionary (for a hashed dictionary, the percentage filled in the hash table).
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- `creation_time` (DateTime) — The time when the dictionary was created or last successfully reloaded.
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- `last_exception` (String) — Text of the error that occurs when creating or reloading the dictionary if the dictionary couldn't be created.
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- `source` (String) — Text describing the data source for the dictionary.
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Note that the amount of memory used by the dictionary is not proportional to the number of items stored in it. So for flat and cached dictionaries, all the memory cells are pre-assigned, regardless of how full the dictionary actually is.
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@ -187,19 +187,19 @@ Contains information about merges and part mutations currently in process for ta
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Columns:
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- `database String` — The name of the database the table is in.
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- `table String` — Table name.
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- `elapsed Float64` — The time elapsed (in seconds) since the merge started.
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- `progress Float64` — The percentage of completed work from 0 to 1.
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- `num_parts UInt64` — The number of pieces to be merged.
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- `result_part_name String` — The name of the part that will be formed as the result of merging.
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- `is_mutation UInt8` - 1 if this process is a part mutation.
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- `total_size_bytes_compressed UInt64` — The total size of the compressed data in the merged chunks.
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- `total_size_marks UInt64` — The total number of marks in the merged parts.
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- `bytes_read_uncompressed UInt64` — Number of bytes read, uncompressed.
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- `rows_read UInt64` — Number of rows read.
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- `bytes_written_uncompressed UInt64` — Number of bytes written, uncompressed.
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- `rows_written UInt64` — Number of rows written.
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- `database` (String) — The name of the database the table is in.
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- `table` (String) — Table name.
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- `elapsed` (Float64) — The time elapsed (in seconds) since the merge started.
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- `progress` (Float64) — The percentage of completed work from 0 to 1.
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- `num_parts` (UInt64) — The number of pieces to be merged.
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- `result_part_name` (String) — The name of the part that will be formed as the result of merging.
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- `is_mutation` (UInt8) - 1 if this process is a part mutation.
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- `total_size_bytes_compressed` (UInt64) — The total size of the compressed data in the merged chunks.
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- `total_size_marks` (UInt64) — The total number of marks in the merged parts.
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- `bytes_read_uncompressed` (UInt64) — Number of bytes read, uncompressed.
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- `rows_read` (UInt64) — Number of rows read.
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- `bytes_written_uncompressed` (UInt64) — Number of bytes written, uncompressed.
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- `rows_written` (UInt64) — Number of rows written.
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## system.metrics {#system_tables-metrics}
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@ -262,76 +262,45 @@ Each row describes one data part.
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Columns:
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- `partition` (`String`) – The partition name. To learn what a partition is, see the description of the [ALTER](../query_language/alter.md#query_language_queries_alter) query.
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- `partition` (String) – The partition name. To learn what a partition is, see the description of the [ALTER](../query_language/alter.md#query_language_queries_alter) query.
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Formats:
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- `YYYYMM` for automatic partitioning by month.
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- `any_string` when partitioning manually.
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- `name` (`String`) – Name of the data part.
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- `active` (`UInt8`) – Flag that indicates whether the part is active. If a part is active, it is used in a table; otherwise, it will be deleted. Inactive data parts remain after merging.
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- `marks` (`UInt64`) – The number of marks. To get the approximate number of rows in a data part, multiply `marks` by the index granularity (usually 8192) (this hint doesn't work for adaptive granularity).
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- `rows` (`UInt64`) – The number of rows.
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- `bytes_on_disk` (`UInt64`) – Total size of all the data part files in bytes.
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- `data_compressed_bytes` (`UInt64`) – Total size of compressed data in the data part. All the auxiliary files (for example, files with marks) are not included.
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- `data_uncompressed_bytes` (`UInt64`) – Total size of uncompressed data in the data part. All the auxiliary files (for example, files with marks) are not included.
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- `marks_bytes` (`UInt64`) – The size of the file with marks.
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- `modification_time` (`DateTime`) – The modification time of the directory with the data part. This usually corresponds to the time of data part creation.|
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- `remove_time` (`DateTime`) – The time when the data part became inactive.
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- `refcount` (`UInt32`) – The number of places where the data part is used. A value greater than 2 indicates that the data part is used in queries or merges.
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- `min_date` (`Date`) – The minimum value of the date key in the data part.
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- `max_date` (`Date`) – The maximum value of the date key in the data part.
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- `min_time` (`DateTime`) – The minimum value of the date and time key in the data part.
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- `name` (String) – Name of the data part.
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- `active` (UInt8) – Flag that indicates whether the part is active. If a part is active, it is used in a table; otherwise, it will be deleted. Inactive data parts remain after merging.
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- `marks` (UInt64) – The number of marks. To get the approximate number of rows in a data part, multiply `marks` by the index granularity (usually 8192) (this hint doesn't work for adaptive granularity).
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- `rows` (UInt64) – The number of rows.
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- `bytes_on_disk` (UInt64) – Total size of all the data part files in bytes.
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- `data_compressed_bytes` (UInt64) – Total size of compressed data in the data part. All the auxiliary files (for example, files with marks) are not included.
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- `data_uncompressed_bytes` (UInt64) – Total size of uncompressed data in the data part. All the auxiliary files (for example, files with marks) are not included.
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- `marks_bytes` (UInt64) – The size of the file with marks.
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- `modification_time` (DateTime) – The modification time of the directory with the data part. This usually corresponds to the time of data part creation.|
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- `remove_time` (DateTime) – The time when the data part became inactive.
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- `refcount` (UInt32) – The number of places where the data part is used. A value greater than 2 indicates that the data part is used in queries or merges.
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- `min_date` (Date) – The minimum value of the date key in the data part.
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- `max_date` (Date) – The maximum value of the date key in the data part.
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- `min_time` (DateTime) – The minimum value of the date and time key in the data part.
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- `max_time`(`DateTime`) – The maximum value of the date and time key in the data part.
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- `partition_id` (`String`) – Id of the partition.
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- `min_block_number` (`UInt64`) – The minimum number of data parts that make up the current part after merging.
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- `max_block_number` (`UInt64`) – The maximum number of data parts that make up the current part after merging.
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- `level` (`UInt32`) – Depth of the merge tree. Zero means that current part was created by insert rather than by merging other parts.
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- `data_version` (`UInt64`) – Number that is used to determine which mutations should be applied to the data part (the mutations with the higher version than `data_version`).
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- `primary_key_bytes_in_memory` (`UInt64`) – The amount of memory (in bytes) used by primary key values.
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- `primary_key_bytes_in_memory_allocated` (`UInt64`) – The amount of memory (in bytes) reserved for primary key values.
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- `is_frozen` (`UInt8`) – Flag that shows partition data backup existence. 1, the backup exists. 0, the backup doesn't exist. For more details, see [FREEZE PARTITION](../query_language/alter.md#alter_freeze-partition)
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- `database` (`String`) – Name of the database.
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- `table` (`String`) – Name of the table.
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- `engine` (`String`) – Name of the table engine without parameters.
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- `path` (`String`) – Absolute path to the folder with data part files.
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- `hash_of_all_files` (`String`) – [sipHash128](../query_language/functions/hash_functions.md#hash_functions-siphash128) of compressed files.
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- `hash_of_uncompressed_files` (`String`) – [sipHash128](../query_language/functions/hash_functions.md#hash_functions-siphash128) of uncompressed data.
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- `uncompressed_hash_of_compressed_files` (`String`) – [sipHash128](../query_language/functions/hash_functions.md#hash_functions-siphash128) of the file with marks.
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- `bytes` (`UInt64`) – Alias for `bytes_on_disk`.
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- `marks_size` (`UInt64`) – Alias for `marks_bytes`.
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- `partition_id` (String) – Id of the partition.
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- `min_block_number` (UInt64) – The minimum number of data parts that make up the current part after merging.
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- `max_block_number` (UInt64) – The maximum number of data parts that make up the current part after merging.
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- `level` (UInt32) – Depth of the merge tree. Zero means that current part was created by insert rather than by merging other parts.
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- `data_version` (UInt64) – Number that is used to determine which mutations should be applied to the data part (the mutations with the higher version than `data_version`).
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- `primary_key_bytes_in_memory` (UInt64) – The amount of memory (in bytes) used by primary key values.
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- `primary_key_bytes_in_memory_allocated` (UInt64) – The amount of memory (in bytes) reserved for primary key values.
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- `is_frozen` (UInt8) – Flag that shows partition data backup existence. 1, the backup exists. 0, the backup doesn't exist. For more details, see [FREEZE PARTITION](../query_language/alter.md#alter_freeze-partition)
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- `database` (String) – Name of the database.
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- `table` (String) – Name of the table.
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- `engine` (String) – Name of the table engine without parameters.
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- `path` (String) – Absolute path to the folder with data part files.
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- `hash_of_all_files` (String) – [sipHash128](../query_language/functions/hash_functions.md#hash_functions-siphash128) of compressed files.
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- `hash_of_uncompressed_files` (String) – [sipHash128](../query_language/functions/hash_functions.md#hash_functions-siphash128) of uncompressed data.
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- `uncompressed_hash_of_compressed_files` (String) – [sipHash128](../query_language/functions/hash_functions.md#hash_functions-siphash128) of the file with marks.
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- `bytes` (UInt64) – Alias for `bytes_on_disk`.
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- `marks_size` (UInt64) – Alias for `marks_bytes`.
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## system.part_log {#system_tables-part-log}
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@ -342,7 +311,12 @@ This table contains information about the events that occurred with the [data pa
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The `system.part_log` table contains the following columns:
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- `event_type` (Enum) — Type of the event that occurred with the data part. Can have one of the following values: `NEW_PART` — inserting, `MERGE_PARTS` — merging, `DOWNLOAD_PART` — downloading, `REMOVE_PART` — removing or detaching using [DETACH PARTITION](../query_language/alter.md#alter_detach-partition), `MUTATE_PART` — updating.
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- `event_type` (Enum) — Type of the event that occurred with the data part. Can have one of the following values:
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- `NEW_PART` — inserting
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- `MERGE_PARTS` — merging
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- `DOWNLOAD_PART` — downloading
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- `REMOVE_PART` — removing or detaching using [DETACH PARTITION](../query_language/alter.md#alter_detach-partition)
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- `MUTATE_PART` — updating.
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- `event_date` (Date) — Event date.
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- `event_time` (DateTime) — Event time.
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- `duration_ms` (UInt64) — Duration.
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@ -366,25 +340,15 @@ The `system.part_log` table is created after the first inserting data to the `Me
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This system table is used for implementing the `SHOW PROCESSLIST` query.
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Columns:
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```
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user String – Name of the user who made the request. For distributed query processing, this is the user who helped the requestor server send the query to this server, not the user who made the distributed request on the requestor server.
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address String - The IP address the request was made from. The same for distributed processing.
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elapsed Float64 - The time in seconds since request execution started.
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rows_read UInt64 - The number of rows read from the table. For distributed processing, on the requestor server, this is the total for all remote servers.
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bytes_read UInt64 - The number of uncompressed bytes read from the table. For distributed processing, on the requestor server, this is the total for all remote servers.
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total_rows_approx UInt64 - The approximation of the total number of rows that should be read. For distributed processing, on the requestor server, this is the total for all remote servers. It can be updated during request processing, when new sources to process become known.
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memory_usage UInt64 - How much memory the request uses. It might not include some types of dedicated memory.
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query String - The query text. For INSERT, it doesn't include the data to insert.
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query_id String - Query ID, if defined.
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```
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- `user` (String) – Name of the user who made the request. For distributed query processing, this is the user who helped the requestor server send the query to this server, not the user who made the distributed request on the requestor server.
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- `address` (String) - The IP address the request was made from. The same for distributed processing.
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- `elapsed` (Float64) - The time in seconds since request execution started.
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- `rows_read` (UInt64) - The number of rows read from the table. For distributed processing, on the requestor server, this is the total for all remote servers.
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- `bytes_read` (UInt64) - The number of uncompressed bytes read from the table. For distributed processing, on the requestor server, this is the total for all remote servers.
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- `total_rows_approx` (UInt64) - The approximation of the total number of rows that should be read. For distributed processing, on the requestor server, this is the total for all remote servers. It can be updated during request processing, when new sources to process become known.
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- `memory_usage` (UInt64) - How much memory the request uses. It might not include some types of dedicated memory.
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- `query` (String) - The query text. For INSERT, it doesn't include the data to insert.
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- `query_id` (String) - Query ID, if defined.
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## system.query_log {#system_tables-query-log}
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@ -608,11 +572,10 @@ I.e. used for executing the query you are using to read from the system.settings
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Columns:
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```
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name String — Setting name.
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value String — Setting value.
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changed UInt8 — Whether the setting was explicitly defined in the config or explicitly changed.
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```
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- `name` (String) — Setting name.
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- `value` (String) — Setting value.
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- `changed` (UInt8) — Whether the setting was explicitly defined in the config or explicitly changed.
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Example:
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@ -666,20 +629,20 @@ If the path specified in 'path' doesn't exist, an exception will be thrown.
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Columns:
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- `name String` — The name of the node.
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- `path String` — The path to the node.
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- `value String` — Node value.
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- `dataLength Int32` — Size of the value.
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- `numChildren Int32` — Number of descendants.
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- `czxid Int64` — ID of the transaction that created the node.
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- `mzxid Int64` — ID of the transaction that last changed the node.
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- `pzxid Int64` — ID of the transaction that last deleted or added descendants.
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- `ctime DateTime` — Time of node creation.
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- `mtime DateTime` — Time of the last modification of the node.
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- `version Int32` — Node version: the number of times the node was changed.
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- `cversion Int32` — Number of added or removed descendants.
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- `aversion Int32` — Number of changes to the ACL.
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- `ephemeralOwner Int64` — For ephemeral nodes, the ID of the session that owns this node.
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- `name` (String) — The name of the node.
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- `path` (String) — The path to the node.
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- `value` (String) — Node value.
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- `dataLength` (Int32) — Size of the value.
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- `numChildren` (Int32) — Number of descendants.
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- `czxid` (Int64) — ID of the transaction that created the node.
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- `mzxid` (Int64) — ID of the transaction that last changed the node.
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- `pzxid` (Int64) — ID of the transaction that last deleted or added descendants.
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- `ctime` (DateTime) — Time of node creation.
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- `mtime` (DateTime) — Time of the last modification of the node.
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- `version` (Int32) — Node version: the number of times the node was changed.
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- `cversion` (Int32) — Number of added or removed descendants.
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- `aversion` (Int32) — Number of changes to the ACL.
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- `ephemeralOwner` (Int64) — For ephemeral nodes, the ID of the session that owns this node.
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Example:
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Loading…
Reference in New Issue
Block a user