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Creates a quota that can be assigned to a user or a role. Syntax: 
CREATE QUOTA [IF NOT EXISTS | OR REPLACE] name [ON CLUSTER cluster_name]
    [IN access_storage_type]
    [KEYED BY {user_name | ip_address | client_key | client_key,user_name | client_key,ip_address | normalized_query_hash} | 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 | written_bytes | execution_time | failed_sequential_authentications | queries_per_normalized_hash} = number } [,...] |
         NO LIMITS | TRACKING ONLY} [,...]]
    [TO {role [,...] | ALL | ALL EXCEPT role [,...]}]
Keys user_name, ip_address, client_key, client_key, user_name, client_key, ip_address, and normalized_query_hash correspond to the fields in the system.quotas table. Parameters queries, query_selects, query_inserts, errors, result_rows, result_bytes, read_rows, read_bytes, written_bytes, execution_time, failed_sequential_authentications, queries_per_normalized_hash correspond to the fields in the system.quotas_usage table. ON CLUSTER clause allows creating quotas on a cluster, see Distributed DDL. Examples Limit the maximum number of queries for the current user with 123 queries in 15 months constraint: 
CREATE QUOTA 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: 
CREATE QUOTA qB FOR INTERVAL 30 minute MAX execution_time = 0.5, FOR INTERVAL 5 quarter MAX queries = 321, errors = 10 TO default;
Create a quota where each distinct normalized query pattern gets its own bucket, limited to 100 executions per hour: 
CREATE QUOTA qC KEYED BY normalized_query_hash FOR INTERVAL 1 hour MAX queries = 100 TO default;
Limit any single normalized query pattern to at most 50 executions per hour (regardless of the quota key type): 
CREATE QUOTA qD FOR INTERVAL 1 hour MAX queries_per_normalized_hash = 50 TO default;
Further examples, using the xml configuration (not supported in ClickHouse Cloud), can be found in the Quotas guide.

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