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# 系统。动物园管理员 {#system-zookeeper}

如果未配置ZooKeeper，则表不存在。 允许从配置中定义的ZooKeeper集群读取数据。
查询必须具有 ‘path’ WHERE子句中的相等条件或者在某个集合中的条件。 这是ZooKeeper中您想要获取数据的孩子的路径。

查询 `SELECT * FROM system.zookeeper WHERE path = '/clickhouse'` 输出对所有孩子的数据 `/clickhouse` 节点。
要输出所有根节点的数据，write path= ‘/’.
如果在指定的路径 ‘path’ 不存在，将引发异常。

查询`SELECT * FROM system.zookeeper WHERE path IN ('/', '/clickhouse')` 输出`/` 和 `/clickhouse`节点上所有子节点的数据。
如果在指定的 ‘path’ 集合中有不存在的路径，将引发异常。
它可以用来做一批ZooKeeper路径查询。

列:

-   `name` (String) — The name of the node.
-   `path` (String) — The path to the node.
-   `value` (String) — Node value.
-   `dataLength` (Int32) — Size of the value.
-   `numChildren` (Int32) — Number of descendants.
-   `czxid` (Int64) — ID of the transaction that created the node.
-   `mzxid` (Int64) — ID of the transaction that last changed the node.
-   `pzxid` (Int64) — ID of the transaction that last deleted or added descendants.
-   `ctime` (DateTime) — Time of node creation.
-   `mtime` (DateTime) — Time of the last modification of the node.
-   `version` (Int32) — Node version: the number of times the node was changed.
-   `cversion` (Int32) — Number of added or removed descendants.
-   `aversion` (Int32) — Number of changes to the ACL.
-   `ephemeralOwner` (Int64) — For ephemeral nodes, the ID of the session that owns this node.

示例:

``` sql
SELECT *
FROM system.zookeeper
WHERE path = '/clickhouse/tables/01-08/visits/replicas'
FORMAT Vertical
```

``` text
Row 1:
──────
name:           example01-08-1.yandex.ru
value:
czxid:          932998691229
mzxid:          932998691229
ctime:          2015-03-27 16:49:51
mtime:          2015-03-27 16:49:51
version:        0
cversion:       47
aversion:       0
ephemeralOwner: 0
dataLength:     0
numChildren:    7
pzxid:          987021031383
path:           /clickhouse/tables/01-08/visits/replicas

Row 2:
──────
name:           example01-08-2.yandex.ru
value:
czxid:          933002738135
mzxid:          933002738135
ctime:          2015-03-27 16:57:01
mtime:          2015-03-27 16:57:01
version:        0
cversion:       37
aversion:       0
ephemeralOwner: 0
dataLength:     0
numChildren:    7
pzxid:          987021252247
path:           /clickhouse/tables/01-08/visits/replicas
```