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82 lines
4.4 KiB
Markdown
82 lines
4.4 KiB
Markdown
---
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slug: /en/operations/system-tables/session_log
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---
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# session_log
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Contains information about all successful and failed login and logout events.
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Columns:
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- `type` ([Enum8](../../sql-reference/data-types/enum.md)) — Login/logout result. Possible values:
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- `LoginFailure` — Login error.
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- `LoginSuccess` — Successful login.
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- `Logout` — Logout from the system.
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- `auth_id` ([UUID](../../sql-reference/data-types/uuid.md)) — Authentication ID, which is a UUID that is automatically generated each time user logins.
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- `session_id` ([String](../../sql-reference/data-types/string.md)) — Session ID that is passed by client via [HTTP](../../interfaces/http.md) interface.
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- `event_date` ([Date](../../sql-reference/data-types/date.md)) — Login/logout date.
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- `event_time` ([DateTime](../../sql-reference/data-types/datetime.md)) — Login/logout time.
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- `event_time_microseconds` ([DateTime64](../../sql-reference/data-types/datetime64.md)) — Login/logout starting time with microseconds precision.
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- `user` ([String](../../sql-reference/data-types/string.md)) — User name.
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- `auth_type` ([Enum8](../../sql-reference/data-types/enum.md)) — The authentication type. Possible values:
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- `NO_PASSWORD`
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- `PLAINTEXT_PASSWORD`
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- `SHA256_PASSWORD`
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- `DOUBLE_SHA1_PASSWORD`
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- `LDAP`
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- `KERBEROS`
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- `SSL_CERTIFICATE`
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- `profiles` ([Array](../../sql-reference/data-types/array.md)([LowCardinality(String)](../../sql-reference/data-types/lowcardinality.md))) — The list of profiles set for all roles and/or users.
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- `roles` ([Array](../../sql-reference/data-types/array.md)([LowCardinality(String)](../../sql-reference/data-types/lowcardinality.md))) — The list of roles to which the profile is applied.
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- `settings` ([Array](../../sql-reference/data-types/array.md)([Tuple](../../sql-reference/data-types/tuple.md)([LowCardinality(String)](../../sql-reference/data-types/lowcardinality.md), [String](../../sql-reference/data-types/string.md)))) — Settings that were changed when the client logged in/out.
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- `client_address` ([IPv6](../../sql-reference/data-types/ipv6.md)) — The IP address that was used to log in/out.
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- `client_port` ([UInt16](../../sql-reference/data-types/int-uint.md)) — The client port that was used to log in/out.
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- `interface` ([Enum8](../../sql-reference/data-types/enum.md)) — The interface from which the login was initiated. Possible values:
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- `TCP`
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- `HTTP`
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- `gRPC`
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- `MySQL`
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- `PostgreSQL`
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- `client_hostname` ([String](../../sql-reference/data-types/string.md)) — The hostname of the client machine where the [clickhouse-client](../../interfaces/cli.md) or another TCP client is run.
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- `client_name` ([String](../../sql-reference/data-types/string.md)) — The `clickhouse-client` or another TCP client name.
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- `client_revision` ([UInt32](../../sql-reference/data-types/int-uint.md)) — Revision of the `clickhouse-client` or another TCP client.
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- `client_version_major` ([UInt32](../../sql-reference/data-types/int-uint.md)) — The major version of the `clickhouse-client` or another TCP client.
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- `client_version_minor` ([UInt32](../../sql-reference/data-types/int-uint.md)) — The minor version of the `clickhouse-client` or another TCP client.
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- `client_version_patch` ([UInt32](../../sql-reference/data-types/int-uint.md)) — Patch component of the `clickhouse-client` or another TCP client version.
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- `failure_reason` ([String](../../sql-reference/data-types/string.md)) — The exception message containing the reason for the login/logout failure.
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**Example**
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Query:
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``` sql
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SELECT * FROM system.session_log LIMIT 1 FORMAT Vertical;
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```
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Result:
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``` text
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Row 1:
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──────
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type: LoginSuccess
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auth_id: 45e6bd83-b4aa-4a23-85e6-bd83b4aa1a23
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session_id:
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event_date: 2021-10-14
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event_time: 2021-10-14 20:33:52
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event_time_microseconds: 2021-10-14 20:33:52.104247
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user: default
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auth_type: PLAINTEXT_PASSWORD
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profiles: ['default']
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roles: []
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settings: [('load_balancing','random'),('max_memory_usage','10000000000')]
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client_address: ::ffff:127.0.0.1
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client_port: 38490
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interface: TCP
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client_hostname:
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client_name: ClickHouse client
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client_revision: 54449
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client_version_major: 21
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client_version_minor: 10
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client_version_patch: 0
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failure_reason:
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```
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