-`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。
**示例**
``` sql
SELECT * FROM system.query_log LIMIT 1 FORMAT Vertical;
- [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.
