ClickHouse/docs/en/sql-reference/statements/alter/quota.md

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46	QUOTA

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 | ERRORS | RESULT_ROWS | RESULT_BYTES | READ_ROWS | READ_BYTES | EXECUTION_TIME} = number } [,...] |
        NO LIMITS | TRACKING ONLY} [,...]]
    [TO {role [,...] | ALL | ALL EXCEPT role [,...]}]

Examples

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

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 quaters:

ALTER QUOTA IF EXISTS qB FOR INTERVAL 30 MINUTE MAX EXECUTION_TIME = 0.5, FOR INTERVAL 5 QUATER MAX QUERIES = 321, ERRORS = 10 TO default;