ALTER QUOTA

Changes quotas.

Syntax:

ALTER QUOTA [IF EXISTS] name [ON CLUSTER cluster_name]
    [RENAME TO new_name]
    [KEYED BY {user_name | ip_address | client_key | client_key,user_name | client_key,ip_address} | NOT KEYED]
    [FOR [RANDOMIZED] INTERVAL number {second | minute | hour | day | week | month | quarter | year}
        {MAX { {queries | query_selects | query_inserts | errors | result_rows | result_bytes | read_rows | read_bytes | execution_time} = number } [,...] |
        NO LIMITS | TRACKING ONLY} [,...]]
    [TO {role [,...] | ALL | ALL EXCEPT role [,...]}]

键 user_name、ip_address、client_key、client_key, user_name 和 client_key, ip_address 对应于 system.quotas 表中的字段。

参数 queries、query_selects、query_inserts、errors、result_rows、result_bytes、read_rows、read_bytes、execution_time 对应于 system.quotas_usage 表中的字段。

ON CLUSTER 子句允许在集群上创建配额，请参阅 Distributed DDL。

示例

限制当前用户在 15 个月内的最大查询数为 123 查询：

ALTER QUOTA IF EXISTS qA FOR INTERVAL 15 month MAX queries = 123 TO CURRENT_USER;

对于默认用户，限制 30 分钟内的最大执行时间为半秒，并限制查询的最大数量为 321，错误的最大数量为 10，在 5 个季度内：

ALTER QUOTA IF EXISTS qB FOR INTERVAL 30 minute MAX execution_time = 0.5, FOR INTERVAL 5 quarter MAX queries = 321, errors = 10 TO default;