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39 lines
1.8 KiB
Markdown
39 lines
1.8 KiB
Markdown
---
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sidebar_position: 46
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sidebar_label: QUOTA
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---
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# ALTER QUOTA {#alter-quota-statement}
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Changes quotas.
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Syntax:
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``` sql
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ALTER QUOTA [IF EXISTS] name [ON CLUSTER cluster_name]
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[RENAME TO new_name]
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[KEYED BY {user_name | ip_address | client_key | client_key,user_name | client_key,ip_address} | NOT KEYED]
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[FOR [RANDOMIZED] INTERVAL number {second | minute | hour | day | week | month | quarter | year}
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{MAX { {queries | query_selects | query_inserts | errors | result_rows | result_bytes | read_rows | read_bytes | execution_time} = number } [,...] |
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NO LIMITS | TRACKING ONLY} [,...]]
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[TO {role [,...] | ALL | ALL EXCEPT role [,...]}]
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```
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Keys `user_name`, `ip_address`, `client_key`, `client_key, user_name` and `client_key, ip_address` correspond to the fields in the [system.quotas](../../../operations/system-tables/quotas.md) table.
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Parameters `queries`, `query_selects`, 'query_inserts', errors`, `result_rows`, `result_bytes`, `read_rows`, `read_bytes`, `execution_time` correspond to the fields in the [system.quotas_usage](../../../operations/system-tables/quotas_usage.md) table.
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`ON CLUSTER` clause allows creating quotas on a cluster, see [Distributed DDL](../../../sql-reference/distributed-ddl.md).
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**Examples**
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Limit the maximum number of queries for the current user with 123 queries in 15 months constraint:
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``` sql
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ALTER QUOTA IF EXISTS qA FOR INTERVAL 15 month MAX queries = 123 TO CURRENT_USER;
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```
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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 quaters:
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``` sql
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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;
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``` |