> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-fix-nav-issues.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> Documentation for Quota

# ALTER QUOTA

Changes quotas.

Syntax:

```sql theme={null}
ALTER QUOTA [IF EXISTS] name [ON CLUSTER cluster_name]
    [RENAME TO new_name]
    [KEYED BY {user_name | ip_address | forwarded_ip_address | client_key | client_key,user_name | client_key,ip_address | normalized_query_hash} | NOT KEYED]
    [IPV4_PREFIX_BITS number]
    [IPV6_PREFIX_BITS number]
    [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 | queries_per_normalized_hash} = number } [,...] |
        NO LIMITS | TRACKING ONLY} [,...]]
    [TO {role [,...] | ALL | ALL EXCEPT role [,...]}]
```

Keys `user_name`, `ip_address`, `forwarded_ip_address`, `client_key`, `client_key, user_name`, `client_key, ip_address`, and `normalized_query_hash` correspond to the fields in the [system.quotas](/reference/system-tables/quotas) table.

`IPV4_PREFIX_BITS` and `IPV6_PREFIX_BITS` options can only be used when `KEYED BY` is `ip_address` or `forwarded_ip_address`. They correspond to the field in the [system.quotas](/reference/system-tables/quotas) table.

Parameters `queries`, `query_selects`, `query_inserts`, `errors`, `result_rows`, `result_bytes`, `read_rows`, `read_bytes`, `execution_time`, `queries_per_normalized_hash` correspond to the fields in the [system.quotas\_usage](/reference/system-tables/quotas_usage) table.

`ON CLUSTER` clause allows creating quotas on a cluster, see [Distributed DDL](/reference/statements/distributed-ddl).

**Examples**

Limit the maximum number of queries for the current user with 123 queries in 15 months constraint:

```sql theme={null}
ALTER QUOTA IF EXISTS qA FOR INTERVAL 15 month MAX queries = 123 TO CURRENT_USER;
```

For the default user limit the maximum execution time with half a second in 30 minutes, and limit the maximum number of queries with 321 and the maximum number of errors with 10 in 5 quarters:

```sql theme={null}
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;
```