@@ -145,10 +145,10 @@ ClickHouse每x秒重新加载内置字典。 这使得编辑字典 “on the fly
- interval – The interval for sending, in seconds.
- timeout – The timeout for sending data, in seconds.
- root\_path – Prefix for keys.
- metrics – Sending data from the [系统。指标](../../operations/system-tables.md#system_tables-metrics) 桌子
- events – Sending deltas data accumulated for the time period from the [系统。活动](../../operations/system-tables.md#system_tables-events) 桌子
- events\_cumulative – Sending cumulative data from the [系统。活动](../../operations/system-tables.md#system_tables-events) 桌子
- asynchronous\_metrics – Sending data from the [系统。asynchronous\_metrics](../../operations/system-tables.md#system_tables-asynchronous_metrics) 桌子
- metrics – Sending data from the [系统。指标](../../operations/system-tables/metrics.md#system_tables-metrics) 桌子
- events – Sending deltas data accumulated for the time period from the [系统。活动](../../operations/system-tables/events.md#system_tables-events) 桌子
- events\_cumulative – Sending cumulative data from the [系统。活动](../../operations/system-tables/events.md#system_tables-events) 桌子
- asynchronous\_metrics – Sending data from the [系统。asynchronous\_metrics](../../operations/system-tables/asynchronous_metrics.md#system_tables-asynchronous_metrics) 桌子
-[系统。活动](../../operations/system-tables/events.md#system_tables-events) — Contains a number of events that have occurred.
-[系统。metric\_log](../../operations/system-tables/metric_log.md#system_tables-metric_log) — Contains a history of metrics values from tables `system.metrics` и `system.events`.
-`name` ([字符串](../../sql-reference/data-types/string.md)) — Data type name.
-`case_insensitive` ([UInt8](../../sql-reference/data-types/int-uint.md)) — Property that shows whether you can use a data type name in a query in case insensitive manner or not. For example, `Date` 和 `date` 都是有效的。
-`alias_to` ([字符串](../../sql-reference/data-types/string.md)) — Data type name for which `name` 是个化名
-`database` ([字符串](../../sql-reference/data-types/string.md)) — Name of the database containing the dictionary created by DDL query. Empty string for other dictionaries.
-`status` ([枚举8](../../sql-reference/data-types/enum.md)) — Dictionary status. Possible values:
-`NOT_LOADED` — Dictionary was not loaded because it was not used.
-`LOADED` — Dictionary loaded successfully.
-`FAILED` — Unable to load the dictionary as a result of an error.
-`LOADING` — Dictionary is loading now.
-`LOADED_AND_RELOADING` — Dictionary is loaded successfully, and is being reloaded right now (frequent reasons: [SYSTEM RELOAD DICTIONARY](../../sql-reference/statements/system.md#query_language-system-reload-dictionary) 查询，超时，字典配置已更改）。
-`FAILED_AND_RELOADING` — Could not load the dictionary as a result of an error and is loading now.
-`origin` ([字符串](../../sql-reference/data-types/string.md)) — Path to the configuration file that describes the dictionary.
-`type` ([字符串](../../sql-reference/data-types/string.md)) — Type of a dictionary allocation. [在内存中存储字典](../../sql-reference/dictionaries/external-dictionaries/external-dicts-dict-layout.md).
-`key` — [密钥类型](../../sql-reference/dictionaries/external-dictionaries/external-dicts-dict-structure.md#ext_dict_structure-key):数字键 ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) or Сomposite key ([字符串](../../sql-reference/data-types/string.md)) — form “(type 1, type 2, …, type n)”.
-`attribute.names` ([阵列](../../sql-reference/data-types/array.md)([字符串](../../sql-reference/data-types/string.md))) — Array of [属性名称](../../sql-reference/dictionaries/external-dictionaries/external-dicts-dict-structure.md#ext_dict_structure-attributes) 由字典提供。
-`attribute.types` ([阵列](../../sql-reference/data-types/array.md)([字符串](../../sql-reference/data-types/string.md))) — Corresponding array of [属性类型](../../sql-reference/dictionaries/external-dictionaries/external-dicts-dict-structure.md#ext_dict_structure-attributes) 这是由字典提供。
-`bytes_allocated` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Amount of RAM allocated for the dictionary.
-`query_count` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Number of queries since the dictionary was loaded or since the last successful reboot.
-`hit_rate` ([Float64](../../sql-reference/data-types/float.md)) — For cache dictionaries, the percentage of uses for which the value was in the cache.
-`element_count` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Number of items stored in the dictionary.
-`load_factor` ([Float64](../../sql-reference/data-types/float.md)) — Percentage filled in the dictionary (for a hashed dictionary, the percentage filled in the hash table).
-`source` ([字符串](../../sql-reference/data-types/string.md)) — Text describing the [数据源](../../sql-reference/dictionaries/external-dictionaries/external-dicts-dict-sources.md) 为了字典
-`lifetime_max` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Maximum [使用寿命](../../sql-reference/dictionaries/external-dictionaries/external-dicts-dict-lifetime.md) 在内存中的字典，之后ClickHouse尝试重新加载字典（如果 `invalidate_query` 被设置，那么只有当它已经改变）。 在几秒钟内设置。
-`loading_start_time` ([日期时间](../../sql-reference/data-types/datetime.md)) — Start time for loading the dictionary.
-`last_successful_update_time` ([日期时间](../../sql-reference/data-types/datetime.md)) — End time for loading or updating the dictionary. Helps to monitor some troubles with external sources and investigate causes.
-`loading_duration` ([Float32](../../sql-reference/data-types/float.md)) — Duration of a dictionary loading.
-`last_exception` ([字符串](../../sql-reference/data-types/string.md)) — Text of the error that occurs when creating or reloading the dictionary if the dictionary couldn't be created.
-`name` ([字符串](../../sql-reference/data-types/string.md)) — Name of a disk in the server configuration.
-`path` ([字符串](../../sql-reference/data-types/string.md)) — Path to the mount point in the file system.
-`free_space` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Free space on disk in bytes.
-`total_space` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Disk volume in bytes.
-`keep_free_space` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Amount of disk space that should stay free on disk in bytes. Defined in the `keep_free_space_bytes` 磁盘配置参数。
-`policy_name` ([字符串](../../sql-reference/data-types/string.md)) — Name of the storage policy.
-`volume_name` ([字符串](../../sql-reference/data-types/string.md)) — Volume name defined in the storage policy.
-`volume_priority` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Volume order number in the configuration.
-`disks` ([数组（字符串)](../../sql-reference/data-types/array.md)) — Disk names, defined in the storage policy.
-`max_data_part_size` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Maximum size of a data part that can be stored on volume disks (0 — no limit).
-`move_factor` ([Float64](../../sql-reference/data-types/float.md)) — Ratio of free disk space. When the ratio exceeds the value of configuration parameter, ClickHouse start to move data to the next volume in order.
│ Query │ 12 │ Number of queries to be interpreted and potentially executed. Does not include queries that failed to parse or were rejected due to AST size limits, quota limits or limits on the number of simultaneously running queries. May include internal queries initiated by ClickHouse itself. Does not count subqueries. │
│ SelectQuery │ 8 │ Same as Query, but only for SELECT queries. │
│ FileOpen │ 73 │ Number of files opened. │
│ ReadBufferFromFileDescriptorRead │ 155 │ Number of reads (read/pread) from a file descriptor. Does not include sockets. │
│ ReadBufferFromFileDescriptorReadBytes │ 9931 │ Number of bytes read from file descriptors. If the file is compressed, this will show the compressed data size. │
-[系统。metric\_log](../../operations/system-tables/metric_log.md#system_tables-metric_log) — Contains a history of metrics values from tables `system.metrics` и `system.events`.
-[监测](../../operations/monitoring.md) — Base concepts of ClickHouse monitoring.
│ Merge │ 0 │ Number of executing background merges │
│ PartMutation │ 0 │ Number of mutations (ALTER DELETE/UPDATE) │
│ ReplicatedFetch │ 0 │ Number of data parts being fetched from replicas │
│ ReplicatedSend │ 0 │ Number of data parts being sent to replicas │
│ ReplicatedChecks │ 0 │ Number of data parts checking for consistency │
│ BackgroundPoolTask │ 0 │ Number of active tasks in BackgroundProcessingPool (merges, mutations, fetches, or replication queue bookkeeping) │
│ BackgroundSchedulePoolTask │ 0 │ Number of active tasks in BackgroundSchedulePool. This pool is used for periodic ReplicatedMergeTree tasks, like cleaning old data parts, altering data parts, replica re-initialization, etc. │
│ DiskSpaceReservedForMerge │ 0 │ Disk space reserved for currently running background merges. It is slightly more than the total size of currently merging parts. │
│ DistributedSend │ 0 │ Number of connections to remote servers sending data that was INSERTed into Distributed tables. Both synchronous and asynchronous mode. │
-[系统。活动](../../operations/system-tables/events.md#system_tables-events) — Contains a number of events that occurred.
-[系统。metric\_log](../../operations/system-tables/metric_log.md#system_tables-metric_log) — Contains a history of metrics values from tables `system.metrics` и `system.events`.
-[监测](../../operations/monitoring.md) — Base concepts of ClickHouse monitoring.
-`partition` (String) – The partition name. To learn what a partition is, see the description of the [ALTER](../../sql-reference/statements/alter.md#query_language_queries_alter) 查询。
格式:
- `YYYYMM` 用于按月自动分区。
- `any_string` 手动分区时。
-`name` (`String`) – Name of the data part.
-`active` (`UInt8`) – Flag that indicates whether the data part is active. If a data part is active, it's used in a table. Otherwise, it's deleted. Inactive data parts remain after merging.
-`marks` (`UInt64`) – The number of marks. To get the approximate number of rows in a data part, multiply `marks` 通过索引粒度（通常为8192）（此提示不适用于自适应粒度）。
-`rows` (`UInt64`) – The number of rows.
-`bytes_on_disk` (`UInt64`) – Total size of all the data part files in bytes.
-`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.
-`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.
-`marks_bytes` (`UInt64`) – The size of the file with marks.
-`modification_time` (`DateTime`) – The time the directory with the data part was modified. This usually corresponds to the time of data part creation.\|
-`remove_time` (`DateTime`) – The time when the data part became inactive.
-`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.
-`min_date` (`Date`) – The minimum value of the date key in the data part.
-`max_date` (`Date`) – The maximum value of the date key in the data part.
-`min_time` (`DateTime`) – The minimum value of the date and time key in the data part.
-`max_time`(`DateTime`) – The maximum value of the date and time key in the data part.
-`partition_id` (`String`) – ID of the partition.
-`min_block_number` (`UInt64`) – The minimum number of data parts that make up the current part after merging.
-`max_block_number` (`UInt64`) – The maximum number of data parts that make up the current part after merging.
-`level` (`UInt32`) – Depth of the merge tree. Zero means that the current part was created by insert rather than by merging other parts.
-`data_version` (`UInt64`) – Number that is used to determine which mutations should be applied to the data part (mutations with a version higher than `data_version`).
-`primary_key_bytes_in_memory` (`UInt64`) – The amount of memory (in bytes) used by primary key values.
-`primary_key_bytes_in_memory_allocated` (`UInt64`) – The amount of memory (in bytes) reserved for primary key values.
-`is_frozen` (`UInt8`) – Flag that shows that a partition data backup exists. 1, the backup exists. 0, the backup doesn't exist. For more details, see [FREEZE PARTITION](../../sql-reference/statements/alter.md#alter_freeze-partition)
-`database` (`String`) – Name of the database.
-`table` (`String`) – Name of the table.
-`engine` (`String`) – Name of the table engine without parameters.
-`path` (`String`) – Absolute path to the folder with data part files.
-`disk` (`String`) – Name of a disk that stores the data part.
-`user` (String) – The user who made the query. Keep in mind that for distributed processing, queries are sent to remote servers under the `default` 用户。 该字段包含特定查询的用户名，而不是此查询启动的查询的用户名。
-`address` (String) – The IP address the request was made from. The same for distributed processing. To track where a distributed query was originally made from, look at `system.processes` 查询请求者服务器上。
-`elapsed` (Float64) – The time in seconds since request execution started.
-`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.
-`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.
-`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.
-`memory_usage` (UInt64) – Amount of RAM the request uses. It might not include some types of dedicated memory. See the [max\_memory\_usage](../../operations/settings/query-complexity.md#settings_max_memory_usage) 设置。
-`query` (String) – The query text. For `INSERT`，它不包括要插入的数据。
-`query_start_time` ([日期时间](../../sql-reference/data-types/datetime.md)) — Start time of query execution.
-`query_duration_ms` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Duration of query execution in milliseconds.
-`read_rows` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Total number or rows read from all tables and table functions participated in query. It includes usual subqueries, subqueries for `IN` 和 `JOIN`. 对于分布式查询 `read_rows` 包括在所有副本上读取的行总数。 每个副本发送它的 `read_rows` 值，并且查询的服务器-发起方汇总所有接收到的和本地的值。 缓存卷不会影响此值。
-`read_bytes` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Total number or bytes read from all tables and table functions participated in query. It includes usual subqueries, subqueries for `IN` 和 `JOIN`. 对于分布式查询 `read_bytes` 包括在所有副本上读取的行总数。 每个副本发送它的 `read_bytes` 值，并且查询的服务器-发起方汇总所有接收到的和本地的值。 缓存卷不会影响此值。
-`written_rows` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — For `INSERT` 查询，写入的行数。 对于其他查询，列值为0。
-`written_bytes` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — For `INSERT` 查询时，写入的字节数。 对于其他查询，列值为0。
-`result_rows` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Number of rows in a result of the `SELECT` 查询，或者在一些行 `INSERT` 查询。
-`result_bytes` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — RAM volume in bytes used to store a query result.
-`memory_usage` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Memory consumption by the query.
-`is_initial_query` ([UInt8](../../sql-reference/data-types/int-uint.md)) — Query type. Possible values:
- 1 — Query was initiated by the client.
- 0 — Query was initiated by another query as part of distributed query execution.
-`user` ([字符串](../../sql-reference/data-types/string.md)) — Name of the user who initiated the current query.
-`query_id` ([字符串](../../sql-reference/data-types/string.md)) — ID of the query.
-`address` ([IPv6](../../sql-reference/data-types/domains/ipv6.md)) — IP address that was used to make the query.
-`port` ([UInt16](../../sql-reference/data-types/int-uint.md)) — The client port that was used to make the query.
-`initial_user` ([字符串](../../sql-reference/data-types/string.md)) — Name of the user who ran the initial query (for distributed query execution).
-`initial_query_id` ([字符串](../../sql-reference/data-types/string.md)) — ID of the initial query (for distributed query execution).
-`initial_address` ([IPv6](../../sql-reference/data-types/domains/ipv6.md)) — IP address that the parent query was launched from.
-`initial_port` ([UInt16](../../sql-reference/data-types/int-uint.md)) — The client port that was used to make the parent query.
-`interface` ([UInt8](../../sql-reference/data-types/int-uint.md)) — Interface that the query was initiated from. Possible values:
- 1 — TCP.
- 2 — HTTP.
-`os_user` ([字符串](../../sql-reference/data-types/string.md)) — Operating system username who runs [ﾂ环板clientｮﾂ嘉ｯﾂ偲](../../interfaces/cli.md).
-`client_hostname` ([字符串](../../sql-reference/data-types/string.md)) — Hostname of the client machine where the [ﾂ环板clientｮﾂ嘉ｯﾂ偲](../../interfaces/cli.md) 或者运行另一个TCP客户端。
-`client_name` ([字符串](../../sql-reference/data-types/string.md)) — The [ﾂ环板clientｮﾂ嘉ｯﾂ偲](../../interfaces/cli.md) 或另一个TCP客户端名称。
-`client_revision` ([UInt32](../../sql-reference/data-types/int-uint.md)) — Revision of the [ﾂ环板clientｮﾂ嘉ｯﾂ偲](../../interfaces/cli.md) 或另一个TCP客户端。
-`client_version_major` ([UInt32](../../sql-reference/data-types/int-uint.md)) — Major version of the [ﾂ环板clientｮﾂ嘉ｯﾂ偲](../../interfaces/cli.md) 或另一个TCP客户端。
-`client_version_minor` ([UInt32](../../sql-reference/data-types/int-uint.md)) — Minor version of the [ﾂ环板clientｮﾂ嘉ｯﾂ偲](../../interfaces/cli.md) 或另一个TCP客户端。
-`client_version_patch` ([UInt32](../../sql-reference/data-types/int-uint.md)) — Patch component of the [ﾂ环板clientｮﾂ嘉ｯﾂ偲](../../interfaces/cli.md) 或另一个TCP客户端版本。
-`http_method` (UInt8) — HTTP method that initiated the query. Possible values:
- 0 — The query was launched from the TCP interface.
- 1 — `GET` 方法被使用。
- 2 — `POST` 方法被使用。
-`http_user_agent` ([字符串](../../sql-reference/data-types/string.md)) — The `UserAgent` http请求中传递的标头。
-`quota_key` ([字符串](../../sql-reference/data-types/string.md)) — The “quota key” 在指定 [配额](../../operations/quotas.md) 设置（见 `keyed`).
-`thread_numbers` ([数组(UInt32)](../../sql-reference/data-types/array.md)) — Number of threads that are participating in query execution.
-`ProfileEvents.Names` ([数组（字符串)](../../sql-reference/data-types/array.md)) — Counters that measure different metrics. The description of them could be found in the table [系统。活动](../../operations/system-tables/events.md#system_tables-events)
-`ProfileEvents.Values` ([数组(UInt64)](../../sql-reference/data-types/array.md)) — Values of metrics that are listed in the `ProfileEvents.Names` 列。
-`Settings.Names` ([数组（字符串)](../../sql-reference/data-types/array.md)) — Names of settings that were changed when the client ran the query. To enable logging changes to settings, set the `log_query_settings` 参数为1。
-`Settings.Values` ([数组（字符串)](../../sql-reference/data-types/array.md)) — Values of settings that are listed in the `Settings.Names` 列。
-[系统。query\_thread\_log](../../operations/system-tables/query_thread_log.md#system_tables-query_thread_log) — This table contains information about each query execution thread.
-`event_date` ([日期](../../sql-reference/data-types/date.md)) — The date when the thread has finished execution of the query.
-`event_time` ([日期时间](../../sql-reference/data-types/datetime.md)) — The date and time when the thread has finished execution of the query.
-`query_start_time` ([日期时间](../../sql-reference/data-types/datetime.md)) — Start time of query execution.
-`query_duration_ms` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Duration of query execution.
-`read_rows` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Number of read rows.
-`read_bytes` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Number of read bytes.
-`written_rows` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — For `INSERT` 查询，写入的行数。 对于其他查询，列值为0。
-`written_bytes` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — For `INSERT` 查询时，写入的字节数。 对于其他查询，列值为0。
-`memory_usage` ([Int64](../../sql-reference/data-types/int-uint.md)) — The difference between the amount of allocated and freed memory in context of this thread.
-`peak_memory_usage` ([Int64](../../sql-reference/data-types/int-uint.md)) — The maximum difference between the amount of allocated and freed memory in context of this thread.
-`thread_name` ([字符串](../../sql-reference/data-types/string.md)) — Name of the thread.
-`is_initial_query` ([UInt8](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Query type. Possible values:
- 1 — Query was initiated by the client.
- 0 — Query was initiated by another query for distributed query execution.
-`user` ([字符串](../../sql-reference/data-types/string.md)) — Name of the user who initiated the current query.
-`query_id` ([字符串](../../sql-reference/data-types/string.md)) — ID of the query.
-`address` ([IPv6](../../sql-reference/data-types/domains/ipv6.md)) — IP address that was used to make the query.
-`port` ([UInt16](../../sql-reference/data-types/int-uint.md#uint-ranges)) — The client port that was used to make the query.
-`initial_user` ([字符串](../../sql-reference/data-types/string.md)) — Name of the user who ran the initial query (for distributed query execution).
-`initial_query_id` ([字符串](../../sql-reference/data-types/string.md)) — ID of the initial query (for distributed query execution).
-`initial_address` ([IPv6](../../sql-reference/data-types/domains/ipv6.md)) — IP address that the parent query was launched from.
-`initial_port` ([UInt16](../../sql-reference/data-types/int-uint.md#uint-ranges)) — The client port that was used to make the parent query.
-`interface` ([UInt8](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Interface that the query was initiated from. Possible values:
- 1 — TCP.
- 2 — HTTP.
-`os_user` ([字符串](../../sql-reference/data-types/string.md)) — OS's username who runs [ﾂ环板clientｮﾂ嘉ｯﾂ偲](../../interfaces/cli.md).
-`client_hostname` ([字符串](../../sql-reference/data-types/string.md)) — Hostname of the client machine where the [ﾂ环板clientｮﾂ嘉ｯﾂ偲](../../interfaces/cli.md) 或者运行另一个TCP客户端。
-`client_name` ([字符串](../../sql-reference/data-types/string.md)) — The [ﾂ环板clientｮﾂ嘉ｯﾂ偲](../../interfaces/cli.md) 或另一个TCP客户端名称。
-`client_revision` ([UInt32](../../sql-reference/data-types/int-uint.md)) — Revision of the [ﾂ环板clientｮﾂ嘉ｯﾂ偲](../../interfaces/cli.md) 或另一个TCP客户端。
-`client_version_major` ([UInt32](../../sql-reference/data-types/int-uint.md)) — Major version of the [ﾂ环板clientｮﾂ嘉ｯﾂ偲](../../interfaces/cli.md) 或另一个TCP客户端。
-`client_version_minor` ([UInt32](../../sql-reference/data-types/int-uint.md)) — Minor version of the [ﾂ环板clientｮﾂ嘉ｯﾂ偲](../../interfaces/cli.md) 或另一个TCP客户端。
-`client_version_patch` ([UInt32](../../sql-reference/data-types/int-uint.md)) — Patch component of the [ﾂ环板clientｮﾂ嘉ｯﾂ偲](../../interfaces/cli.md) 或另一个TCP客户端版本。
-`http_method` ([UInt8](../../sql-reference/data-types/int-uint.md#uint-ranges)) — HTTP method that initiated the query. Possible values:
- 0 — The query was launched from the TCP interface.
- 1 — `GET` 方法被使用。
- 2 — `POST` 方法被使用。
-`http_user_agent` ([字符串](../../sql-reference/data-types/string.md)) — The `UserAgent` http请求中传递的标头。
-`quota_key` ([字符串](../../sql-reference/data-types/string.md)) — The “quota key” 在指定 [配额](../../operations/quotas.md) 设置（见 `keyed`).
-`ProfileEvents.Names` ([数组（字符串)](../../sql-reference/data-types/array.md)) — Counters that measure different metrics for this thread. The description of them could be found in the table [系统。活动](#system_tables-events).
-`ProfileEvents.Values` ([数组(UInt64)](../../sql-reference/data-types/array.md)) — Values of metrics for this thread that are listed in the `ProfileEvents.Names` 列。
-`changed` ([UInt8](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Shows whether a setting is changed from its default value.
-`description` ([字符串](../../sql-reference/data-types/string.md)) — Short setting description.
-`min` ([可为空](../../sql-reference/data-types/nullable.md)([字符串](../../sql-reference/data-types/string.md))) — Minimum value of the setting, if any is set via [制约因素](../../operations/settings/constraints-on-settings.md#constraints-on-settings). 如果设置没有最小值，则包含 [NULL](../../sql-reference/syntax.md#null-literal).
-`max` ([可为空](../../sql-reference/data-types/nullable.md)([字符串](../../sql-reference/data-types/string.md))) — Maximum value of the setting, if any is set via [制约因素](../../operations/settings/constraints-on-settings.md#constraints-on-settings). 如果设置没有最大值，则包含 [NULL](../../sql-reference/syntax.md#null-literal).
-`readonly` ([UInt8](../../sql-reference/data-types/int-uint.md#uint-ranges)) — Shows whether the current user can change the setting:
│ min_insert_block_size_rows │ 1048576 │ 0 │ Squash blocks passed to INSERT query to specified size in rows, if blocks are not big enough. │ ᴺᵁᴸᴸ │ ᴺᵁᴸᴸ │ 0 │
│ min_insert_block_size_bytes │ 268435456 │ 0 │ Squash blocks passed to INSERT query to specified size in bytes, if blocks are not big enough. │ ᴺᵁᴸᴸ │ ᴺᵁᴸᴸ │ 0 │
│ read_backoff_min_interval_between_events_ms │ 1000 │ 0 │ Settings to reduce the number of threads in case of slow reads. Do not pay attention to the event, if the previous one has passed less than a certain amount of time. │ ᴺᵁᴸᴸ │ ᴺᵁᴸᴸ │ 0 │
-`policy_name` ([字符串](../../sql-reference/data-types/string.md)) — Name of the storage policy.
-`volume_name` ([字符串](../../sql-reference/data-types/string.md)) — Volume name defined in the storage policy.
-`volume_priority` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Volume order number in the configuration.
-`disks` ([数组（字符串)](../../sql-reference/data-types/array.md)) — Disk names, defined in the storage policy.
-`max_data_part_size` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Maximum size of a data part that can be stored on volume disks (0 — no limit).
-`move_factor` ([Float64](../../sql-reference/data-types/float.md)) — Ratio of free disk space. When the ratio exceeds the value of configuration parameter, ClickHouse start to move data to the next volume in order.
-`supports_settings` (UInt8) — Flag that indicates if table engine supports `SETTINGS` 条款
-`supports_skipping_indices` (UInt8) — Flag that indicates if table engine supports [跳过索引](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-data_skipping-indexes).
-`supports_ttl` (UInt8) — Flag that indicates if table engine supports [TTL](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-ttl).
-`supports_sort_order` (UInt8) — Flag that indicates if table engine supports clauses `PARTITION_BY`, `PRIMARY_KEY`, `ORDER_BY` 和 `SAMPLE_BY`.
-`supports_replication` (UInt8) — Flag that indicates if table engine supports [数据复制](../../engines/table-engines/mergetree-family/replication.md).
-`supports_duduplication` (UInt8) — Flag that indicates if table engine supports data deduplication.
-`query_id` ([字符串](../../sql-reference/data-types/string.md)) — Query identifier that can be used to get details about a query that was running from the [query\_log](#system_tables-query_log) 系统表.
-`trace` ([数组(UInt64)](../../sql-reference/data-types/array.md)) — Stack trace at the moment of sampling. Each element is a virtual memory address inside ClickHouse server process.
Don't list too many values explicitly (i.e. millions). If a data set is large, put it in a temporary table (for example, see the section “External data for query processing”），然后使用子查询。
`after_having_exclusive` – Don't include rows that didn't pass through `max_rows_to_group_by`. 换句话说, ‘totals’ 将有少于或相同数量的行，因为它会 `max_rows_to_group_by` 被省略。
`after_having_inclusive` – Include all the rows that didn't pass through ‘max\_rows\_to\_group\_by’ 在 ‘totals’. 换句话说, ‘totals’ 将有多个或相同数量的行，因为它会 `max_rows_to_group_by` 被省略。
`after_having_auto` – Count the number of rows that passed through HAVING. If it is more than a certain amount (by default, 50%), include all the rows that didn't pass through ‘max\_rows\_to\_group\_by’ 在 ‘totals’. 否则，不包括它们。
`totals_auto_threshold` – By default, 0.5. The coefficient for `after_having_auto`.
当启用外部聚合时，如果有小于 `max_bytes_before_external_group_by` of data (i.e. data was not flushed), the query runs just as fast as without external aggregation. If any temporary data was flushed, the run time will be several times longer (approximately three times).
An extra two rows are calculated – the minimums and maximums, respectively. These extra two rows are output in `JSON*`, `TabSeparated*`，和 `Pretty*`[格式](../../../interfaces/formats.md)，与其他行分开。 它们不是其他格式的输出。
该 `GROUP BY` 和 `ORDER BY` 子句不支持位置参数。 这与MySQL相矛盾，但符合标准SQL。 例如, `GROUP BY 1, 2` will be interpreted as grouping by constants (i.e. aggregation of all rows into one).
Also the behavior of ClickHouse server for `ANY JOIN` operations depends on the [any_join_distinct_right_table_keys](../../../operations/settings/settings.md#any_join_distinct_right_table_keys) setting.
