runtime_filter_max_in_num

Description

runtime_filter_max_in_num specifies the number of distinct values (NDV) for a column in the Runtime In Filter.

Privilege requirements

• Query variables

  • Global level

    sys tenant and all user tenants can use the SHOW VARIABLES statement or the SYS.TENANT_VIRTUAL_GLOBAL_VARIABLE view (Oracle mode) and the information_schema.GLOBAL_VARIABLES view (MySQL mode) to view the values of global system variables.

  • Session level

    sys tenant and all user tenants can use the SHOW VARIABLES statement or the SYS.TENANT_VIRTUAL_SESSION_VARIABLE view (Oracle mode) and the information_schema.SESSION_VARIABLES view (MySQL mode) to view the values of session system variables.

• Modify variables

  • Global level

    • sys tenant can directly modify the value of global system variables.

    • MySQL user tenants must have the SUPER or ALTER SYSTEM privilege to modify the value of global system variables.

    • Oracle user tenants must have the ALTER SYSTEM privilege to modify the value of global system variables.

  • Session level

    sys tenant and all user tenants can directly modify the value of session system variables.

Attributes

Examples

Set the number of distinct values (NDV) for a column in the Runtime In Filter to 100.

• Session level

  obclient> SET runtime_filter_wait_time_ms = 100;
  

• Global level

  obclient> SET GLOBAL runtime_filter_max_in_num = 512;