ClickHouse/docs/en/operations/system-tables/zookeeper_connection.md

---
slug: /en/operations/system-tables/zookeeper_connection
---
#zookeeper_connection

This table does not exist if ZooKeeper is not configured. The 'system.zookeeper_connection' table shows current connections to ZooKeeper (including auxiliary ZooKeepers). Each row shows information about one connection.

Columns:

-   `name` ([String](../../sql-reference/data-types/string.md)) — ZooKeeper cluster's name.
-   `host` ([String](../../sql-reference/data-types/string.md)) — The hostname/IP of the ZooKeeper node that ClickHouse connected to.
-   `port` ([String](../../sql-reference/data-types/string.md)) — The port of the ZooKeeper node that ClickHouse connected to.
-   `index` ([UInt8](../../sql-reference/data-types/int-uint.md)) — The index of the ZooKeeper node that ClickHouse connected to. The index is from ZooKeeper config.
-   `connected_time` ([DateTime](../../sql-reference/data-types/datetime.md)) — When the connection was established
-   `session_uptime_elapsed_seconds` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Seconds elapsed since the connection was established
-   `is_expired` ([UInt8](../../sql-reference/data-types/int-uint.md)) — Is the current connection expired.
-   `keeper_api_version` ([String](../../sql-reference/data-types/string.md)) — Keeper API version.
-   `client_id` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Session id of the connection.
-   `xid` ([Int32](../../sql-reference/data-types/int-uint.md)) — Xid of the current session.

Example:

``` sql
SELECT * FROM system.zookeeper_connection;
```

``` text
┌─name────┬─host──────┬─port─┬─index─┬──────connected_time─┬─session_uptime_elapsed_seconds─┬─is_expired─┬─keeper_api_version─┬─client_id─┐
│ default │ 127.0.0.1 │ 9181 │     0 │ 2023-06-15 14:36:01 │                           3058 │          0 │                  3 │         5 │
└─────────┴───────────┴──────┴───────┴─────────────────────┴────────────────────────────────┴────────────┴────────────────────┴───────────┘
```